Professor Dirk van der Werf

Professor Emeritus (Science)

Faculty of Science and Engineering

d.p.van.der.werf@swansea.ac.uk

Available For Postgraduate Supervision

About

Professor Dirk van der Werk is a member of the Physics Department at Swansea University.

Please visit my Personal website

Areas Of Expertise

Positron Phyics
Positronium Physics
Antimatter
Antihydrogen
Gravitational acceleration of Antimatter

Publications

Research Highlights

Ahmadi, M., Alves, B., Baker, C., Bertsche, W., Butler, E., Capra, A., Carruth, C., Cesar, C., Charlton, M., Cohen, S., Collister, R., Eriksson, S., Evans, A., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A...., & Wurtele, J. (2017). Antihydrogen accumulation for fundamental symmetry tests. Nature Communications, 8(1)
https://doi.org/10.1038/s41467-017-00760-9, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45319
Ahmadi, M., Alves, B., Baker, C., Bertsche, W., Butler, E., Capra, A., Carruth, C., Cesar, C., Charlton, M., Cohen, S., Collister, R., Eriksson, S., Evans, A., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A...., & Eriksson, S. (2017). Observation of the hyperfine spectrum of antihydrogen. Nature, 548(7665), 66-69.
https://doi.org/10.1038/nature23446, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45301
Miranda, D., Cesar, C., Sacramento, R., Ahmadi, M., Nolan, P., Pusa, P., Baquero-Ruiz, M., Carruth, C., Charman, A., Evans, L., Fajans, J., Povilus, A., So, C., Wurtele, J., Zhmoginov, A., Bertsche, W., Butler, E., Ishida, A., Capra, A...., & Thompson, R. (2016). Fundamental Tests of Physics with Antihydrogen at ALPHA. In Latin America Optics and Photonics Conference (pp. LTu3B.1
https://doi.org/10.1364/LAOP.2016.LTu3B.1, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45302
https://www.osapublishing.org/abstract.cfm?URI=LAOP-2016-LTu3B.1
Charlton, M., van der Werf, D., & Charlton, M. (2015). Advances in antihydrogen physics. Science Progress, 98(1), 34-62.
https://doi.org/10.3184/003685015X14234978376369, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa22137
Deller, A., Mortensen, T., Isaac, C., P van der Werf, D., Charlton, M., Charlton, M., van der Werf, D., & Isaac, A. (2014). Radially selective inward transport of positrons in a Penning–Malmberg trap. New Journal of Physics, 16(7), 073028
https://doi.org/10.1088/1367-2630/16/7/073028, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa19832
van der Werf, D. & van der Werf, D. (2014). The GBAR experiment. International Journal of Modern Physics: Conference Series, 30, 1460263
https://doi.org/10.1142/S2010194514602634, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa19834
Jonsell, S., van der Werf, D., Charlton, M., & van der Werf, D. (2014). Metastable states in antihydrogen formation. Hyperfine Interactions, 228(1-3), 81-83.
https://doi.org/10.1007/s10751-014-1072-1, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa19835
Charlton, M., Giles, T., Lewis, H., Werf, D., & van der Werf, D. (2013). Positron annihilation in small molecules. Journal of Physics B: Atomic, Molecular and Optical Physics, 46(19), 195001
https://doi.org/10.1088/0953-4075/46/19/195001, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa15931
Charlton, M., Eriksson, S., Isaac, C., Madsen, N., Werf, D., van der Werf, D., & Isaac, A. (2013). Antihydrogen in a bottle. Physics Education, 48(2)-220.
https://doi.org/10.1088/0031-9120/48/2/212, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa14475
Friesen, T., Amole, C., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Bowe, P., Butler, E., Capra, A., Cesar, C., Charlton, M., Deller, A., Evetts, N., Eriksson, S., Fajans, J., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J., Hardy, W...., & van der Werf, D. (2013). Electron plasmas as a diagnostic tool for hyperfine spectroscopy of antihydrogen. -133).
https://doi.org/10.1063/1.4796068, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa15932

All Research

Journal Articles

Akbari, R., Alves, B., Baker, C., Baquero-Ruiz, M., Bertsche, W., Butler, E., Burrows, C., Capra, A., Cesar, C., Charlton, M., Collister, R., Cridland, A., Eriksson, S., Evans, A., Evans, L., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M...., & Wurtele, J. (2025). The ALPHA-2 apparatus - facilitating experimentation with trapped antihydrogen. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1072, 170194
https://doi.org/10.1016/j.nima.2024.170194, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa68754
Baker, C., Bertsche, W., Capra, A., Carruth, C., Cesar, C., Charlton, M., Christensen, A., Collister, R., Cridland, A., Eriksson, S., Evans, A., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Grandemange, P., Granum, P., Hangst, J...., & Shore, G. (2025). Precision spectroscopy of the hyperfine components of the 1S–2S transition in antihydrogen. Nature Physics, 21(2), 201-207.
https://doi.org/10.1038/s41567-024-02712-9, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa68708
Ahmadi, M., Alves, B., Baker, C., Bertsche, W., Capra, A., Cohen, S., Torkzaban, C., Cesar, C., Charlton, M., Collister, R., Eriksson, S., Evans, A., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M., Granum, P., Hangst, J., Hayden, M...., & Collaboration), . (2024). Adiabatic expansion cooling of antihydrogen. Physical Review Research, 6(3)
https://doi.org/10.1103/physrevresearch.6.l032065, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa67727
Isaac, A., Baker, C., Bertsche, W., Capra, A., Cesar, C., Charlton, M., Christensen, A., Collister, R., Cridland, A., Eriksson, S., Evans, A., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Grandemange, P., Granum, P., Hangst, J...., & Collaboration), . (2024). Measurements of Penning-Malmberg trap patch potentials and associated performance degradation. Physical Review Research, 6(1)
https://doi.org/10.1103/physrevresearch.6.l012008, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa65508
Isaac, A., Baker, C., Bertsche, W., Capra, A., Cesar, C., Charlton, M., Christensen, A., Collister, R., Mathad, A., Eriksson, S., Evans, A., Evetts, N., Fabbri, S., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Grandemange, P., Granum, P...., & Jones, J. (2023). Design and performance of a novel low energy multispecies beamline for an antihydrogen experiment. Physical Review Accelerators and Beams, 26(4)
https://doi.org/10.1103/physrevaccelbeams.26.040101, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa63230
http://dx.doi.org/10.1103/physrevaccelbeams.26.040101
Yoo, K., Moon, S., Chung, M., Won, D., Park, K., Lee, B., Kim, S., Lim, E., Kim, E., Kim, B., van der Werf, D., Kuroda, N., & Pérez, P. (2022). Design study of an antiproton trap for the GBAR experiment. Journal of Instrumentation, 17(10), T10003
https://doi.org/10.1088/1748-0221/17/10/t10003, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa61803
Blumer, P., Charlton, M., Chung, M., Cladé, P., Comini, P., Crivelli, P., Dalkarov, O., Debu, P., Dodd, L., Douillet, A., Guellati, S., Hervieux, P., Hilico, L., Husson, A., Indelicato, P., Janka, G., Jonsell, S., Karr, J., Kim, B...., & Baker, C. (2022). Positron accumulation in the GBAR experiment. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1040, 167263
https://doi.org/10.1016/j.nima.2022.167263, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa60681
Baker, C., Bertsche, W., Capra, A., Cesar, C., Charlton, M., Cridland, A., Eriksson, S., Evans, A., Evetts, N., Fabbri, S., Fajans, J., Friesen, T., Fujiwara, M., Grandemange, P., Granum, P., Hangst, J., Hayden, M., Hodgkinson, D., Isaac, A...., & Wurtele, J. (2021). Sympathetic cooling of positrons to cryogenic temperatures for antihydrogen production. Nature Communications, 12(1)
https://doi.org/10.1038/s41467-021-26086-1, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa58657
Husson, A., Kim, B., Welker, A., Charlton, M., Choi, J., Chung, M., Cladé, P., Comini, P., Crépin, P., Crivelli, P., Dalkarov, O., Debu, P., Dodd, L., Douillet, A., Guellati-Khélifa, S., Garroum, N., Hervieux, P., Hilico, L., Indelicato, P...., & Yoo, K. (2021). A pulsed high-voltage decelerator system to deliver low-energy antiprotons. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1002, 165245
https://doi.org/10.1016/j.nima.2021.165245, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa57076
Baker, C., Bertsche, W., Capra, A., Carruth, C., Cesar, C., Charlton, M., Christensen, A., Collister, R., Cridland, A., Eriksson, S., Evans, A., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Grandemange, P., Granum, P., Hangst, J...., & Charlton, M. (2021). Laser cooling of antihydrogen atoms. Nature, 592(7852), 35-42.
https://doi.org/10.1038/s41586-021-03289-6, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa56625
Baker, C., Isaac, A., Edwards, D., Evans, H., Clayton, R., van der Werf, D., & Charlton, M. (2020). Investigation of buffer gas trapping of positrons. Journal of Physics B: Atomic, Molecular and Optical Physics, 53(18), 185201
https://doi.org/10.1088/1361-6455/aba10c, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa56642
Collaboration), ., Ahmadi, M., Alves, B., Baker, C., Bertsche, W., Capra, A., Carruth, C., Cesar, C., Charlton, M., Cohen, S., Collister, R., Eriksson, S., Evans, A., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Granum, P...., & Wurtele, J. (2020). Investigation of the fine structure of antihydrogen. Nature, 578(7795), 375-380.
https://doi.org/10.1038/s41586-020-2006-5, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa53592
Niang, S., Charlton, M., Choi, J., Chung, M., Cladé, P., Comini, P., Crivelli, P., Crépin, P., Dalkarov, O., Debu, P., Dodd, L., Douillet, A., Froehlich, P., Gafriller, J., Guellati, S., Heinrich, J., Hervieux, P., Hilico, L., Husson, A...., & Baker, C. (2020). Accumulation of Positrons from a LINAC Based Source. Acta Physica Polonica A, 137(2), 164-166.
https://doi.org/10.12693/aphyspola.137.164, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa53875
Ahmadi, M., Alves, B., Baker, C., Bertsche, W., Capra, A., Carruth, C., Cesar, C., Charlton, M., Cohen, S., Collister, R., Eriksson, S., Evans, A., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Hangst, J., Hardy, W...., & Wurtele, J. (2018). Observation of the 1S–2P Lyman-α transition in antihydrogen. Nature, 561(7722), 211-215.
https://doi.org/10.1038/s41586-018-0435-1, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa43610
Ahmadi, M., Alves, B., Baker, C., Bertsche, W., Capra, A., Carruth, C., Cesar, C., Charlton, M., Cohen, S., Collister, R., Eriksson, S., Evans, A., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Hangst, J., Hardy, W...., & Wurtele, J. (2018). Characterization of the 1S–2S transition in antihydrogen. Nature, 557(7703), 71-75.
https://doi.org/10.1038/s41586-018-0017-2, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa39315
Isaac, A., Baker, C., Edwards, D., Isaac, C., Telle, H., van der Werf, D., Charlton, M., & Charlton, M. (2018). Excitation of positronium: from the ground state to Rydberg levels. Journal of Physics B: Atomic, Molecular and Optical Physics, 51
https://doi.org/10.1088/1361-6455/aa9aa2, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa36783
Ahmadi, M., Alves, B., Baker, C., Bertsche, W., Capra, A., Carruth, C., Cesar, C., Charlton, M., Cohen, S., Collister, R., Eriksson, S., Evans, A., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Hangst, J., Hardy, W...., & Charlton, M. (2018). Enhanced Control and Reproducibility of Non-Neutral Plasmas. Physical Review Letters, 120(2)
https://doi.org/10.1103/physrevlett.120.025001, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa37994
Ahmadi, M., Alves, B., Baker, C., Bertsche, W., Butler, E., Capra, A., Carruth, C., Cesar, C., Charlton, M., Cohen, S., Collister, R., Eriksson, S., Evans, A., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A...., & Wurtele, J. (2017). Antihydrogen accumulation for fundamental symmetry tests. Nature Communications, 8(1)
https://doi.org/10.1038/s41467-017-00760-9, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45319
Ahmadi, M., Alves, B., Baker, C., Bertsche, W., Butler, E., Capra, A., Carruth, C., Cesar, C., Charlton, M., Cohen, S., Collister, R., Eriksson, S., Evans, A., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A...., & Eriksson, S. (2017). Observation of the hyperfine spectrum of antihydrogen. Nature, 548(7665), 66-69.
https://doi.org/10.1038/nature23446, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45301
Capra, A., Amole, C., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Butler, E., Cesar, C., Charlton, M., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J., Hardy, W., Hayden, M., Isaac, C., Jonsell, S...., & Eriksson, S. (2016). Limit on the electric charge of antihydrogen. Hyperfine Interactions, 238(1)
https://doi.org/10.1007/s10751-016-1382-6, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa32963
Ahmadi, M., Alves, B., Baker, C., Bertsche, W., Butler, E., Capra, A., Carruth, C., Cesar, C., Charlton, M., Cohen, S., Collister, R., Eriksson, S., Evans, A., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A...., & Wurtele, J. (2016). Observation of the 1S–2S transition in trapped antihydrogen. Nature, 541(7638), 506-510.
https://doi.org/10.1038/nature21040, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa36784
Jonsell, S., Charlton, M., Werf, D., Charlton, M., & van der Werf, D. (2016). The role of antihydrogen formation in the radial transport of antiprotons in positron plasmas. Journal of Physics B: Atomic, Molecular and Optical Physics, 49(13), 134004
https://doi.org/10.1088/0953-4075/49/13/134004, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa30566
Ahmadi, M., Baquero-Ruiz, M., Bertsche, W., Butler, E., Capra, A., Carruth, C., Cesar, C., Charman, A., Evans, L., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J., Hardy, W., Hayden, M., Ishida, A...., & Eriksson, S. (2016). An improved limit on the charge of antihydrogen from stochastic acceleration. Nature, 529(7586), 373-376.
https://doi.org/10.1038/nature16491, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa25943
Charlton, M., van der Werf, D., & Charlton, M. (2015). Advances in antihydrogen physics. Science Progress, 98(1), 34-62.
https://doi.org/10.3184/003685015X14234978376369, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa22137
Gutierrez, A., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Burrows, C., Butler, E., Capra, A., Cesar, C., Charlton, M., Dunlop, R., Eriksson, S., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Hangst, J., Hardy, W., Hayden, M...., & Zhmoginov, A. (2015). Antiproton cloud compression in the ALPHA apparatus at CERN. Hyperfine Interactions, 235(1-3), 21-28.
https://doi.org/10.1007/s10751-015-1202-4, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa24055
Pérez, P., Banerjee, D., Biraben, F., Brook-Roberge, D., Charlton, M., Cladé, P., Comini, P., Crivelli, P., Dalkarov, O., Debu, P., Douillet, A., Dufour, G., Dupré, P., Eriksson, S., Froelich, P., Grandemange, P., Guellati, S., Guérout, R., Heinrich, J...., & Eriksson, S. (2015). The GBAR antimatter gravity experiment. Hyperfine Interactions, 233(1-3), 21-27.
https://doi.org/10.1007/s10751-015-1154-8, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa32986
Deller, A., Edwards, D., Mortensen, T., Isaac, C., Werf, D., Telle, H., Charlton, M., Charlton, M., van der Werf, D., & Isaac, A. (2015). Exciting positronium with a solid-state UV laser: the Doppler-broadened Lyman-αtransition. Journal of Physics B: Atomic, Molecular and Optical Physics, 48(17), 175001
https://doi.org/10.1088/0953-4075/48/17/175001, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa22553
Deller, A., Mortensen, T., Isaac, C., P van der Werf, D., Charlton, M., Charlton, M., van der Werf, D., & Isaac, A. (2014). Radially selective inward transport of positrons in a Penning–Malmberg trap. New Journal of Physics, 16(7), 073028
https://doi.org/10.1088/1367-2630/16/7/073028, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa19832
van der Werf, D. & van der Werf, D. (2014). The GBAR experiment. International Journal of Modern Physics: Conference Series, 30, 1460263
https://doi.org/10.1142/S2010194514602634, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa19834
Jonsell, S., van der Werf, D., Charlton, M., & van der Werf, D. (2014). Metastable states in antihydrogen formation. Hyperfine Interactions, 228(1-3), 81-83.
https://doi.org/10.1007/s10751-014-1072-1, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa19835
Amole, C., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Butler, E., Capra, A., Cesar, C., Charlton, M., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J., Hardy, W., Hayden, M., Isaac, C., Jonsell, S...., & Eriksson, S. (2014). An experimental limit on the charge of antihydrogen. Nature Communications, 5, 3955
https://doi.org/10.1038/ncomms4955, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa18032
http://www.nature.com/ncomms/2014/140603/ncomms4955/full/ncomms4955.html
Indelicato, P., Chardin, G., Grandemange, P., Lunney, D., Manea, V., Badertscher, A., Crivelli, P., Curioni, A., Marchionni, A., Rossi, B., Rubbia, A., Nesvizhevsky, V., Brook-Roberge, D., Comini, P., Debu, P., Dupré, P., Liszkay, L., Mansoulié, B., Pérez, P...., & van der Werf, D. (2014). The Gbar project, or how does antimatter fall?. Hyperfine Interactions, 228(1-3), 141-150.
https://doi.org/10.1007/s10751-014-1019-6, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa18706
Charlton, M., van der Werf, D., Madsen, N., Isaac, A., & Eriksson, S. (2014). In situelectromagnetic field diagnostics with an electron plasma in a Penning–Malmberg trap. New Journal of Physics, 16(1), 013037
https://doi.org/10.1088/1367-2630/16/1/013037, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa17396
Amole, C., Andresen, G., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Bowe, P., Butler, E., Capra, A., Carpenter, P., Cesar, C., Chapman, S., Charlton, M., Deller, A., Eriksson, S., Escallier, J., Fajans, J., Friesen, T., Fujiwara, M., Gill, D...., & Eriksson, S. (2014). The ALPHA antihydrogen trapping apparatus. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 735, 319-340.
https://doi.org/10.1016/j.nima.2013.09.043, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa18705
Charlton, M., Giles, T., Lewis, H., Werf, D., & van der Werf, D. (2013). Positron annihilation in small molecules. Journal of Physics B: Atomic, Molecular and Optical Physics, 46(19), 195001
https://doi.org/10.1088/0953-4075/46/19/195001, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa15931
Amole, C., Andresen, G., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Burrows, C., Butler, E., Capra, A., Cesar, C., Chapman, S., Charlton, M., Deller, A., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J...., & Eriksson, S. (2013). Silicon vertex detector upgrade in the ALPHA experiment. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 732, 134-136.
https://doi.org/10.1016/j.nima.2013.05.188, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa17394
Amole, C., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Butler, E., Capra, A., Cesar, C., Chapman, S., Charlton, M., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J., Hardy, W., Hayden, M., Isaac, C...., & Eriksson, S. (2013). Autoresonant-spectrometric determination of the residual gas composition in the ALPHA experiment apparatus. Review of Scientific Instruments, 84(6), 065110
https://doi.org/10.1063/1.4811527, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa22128
Amole, C., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Butler, E., Capra, A., Cesar, C., Charlton, M., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J., Hardy, W., Hayden, M., Isaac, C., Jonsell, S...., & Eriksson, S. (2013). Description and first application of a new technique to measure the gravitational mass of antihydrogen. Nature Communications, 4
https://doi.org/10.1038/ncomms2787, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa14766
Amole, C., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Butler, E., Capra, A., Cesar, C., Charlton, M., Deller, A., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J., Hardy, W., Hayden, M., Isaac, C...., & Eriksson, S. (2013). Experimental and computational study of the injection of antiprotons into a positron plasma for antihydrogen production. Physics of Plasmas, 20(4), 043510
https://doi.org/10.1063/1.4801067, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa22125
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Andresen, G., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Bowe, P., Bray, C., Butler, E., Cesar, C., Chapman, S., Charlton, M., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Hangst, J., Hardy, W., Hayano, R., Hayden, M., Humphries, A...., & Madsen, N. (2011). Search for trapped antihydrogen. Physics Letters B, 695(1-4), 95-104.
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Andresen, G., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Bowe, P., Butler, E., Cesar, C., Charlton, M., Deller, A., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J., Hardy, W., Hayano, R., Hayden, M...., & Eriksson, S. (2011). Confinement of antihydrogen for 1,000 seconds. Nature Physics, 7(7), 558-564.
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Butler, E., Andresen, G., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Bowe, P., Bray, C., Cesar, C., Chapman, S., Charlton, M., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Hangst, J., Hardy, W., Hayano, R., Hayden, M., Humphries, A...., & Madsen, N. (2011). Towards antihydrogen trapping and spectroscopy at ALPHA. Hyperfine Interactions, 199(1-3), 39-48.
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Werf, D., Donnelly, P., Charlton, M., Cottrell, S., Cox, S., & van der Werf, D. (2006). The effect of adsorbed noble gas atoms on muonium formation at the silica surface. Physica B: Condensed Matter, 374-375-358.
https://doi.org/10.1016/j.physb.2005.11.094, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa15948
Fujiwara, M., Andresen, G., Bertsche, W., Boston, A., Bowe, P., Cesar, C., Chapman, S., Charlton, M., Chartier, M., Deutsch, A., Fajans, J., Funakoshi, R., Gill, D., Gomberoff, K., Hangst, J., Hardy, W., Hayano, R., Hydomako, R., Jenkins, M...., & van der Werf, D. (2006). Towards antihydrogen confinement with the ALPHA antihydrogen trap. Hyperfine Interactions, 172(1-3)-89.
https://doi.org/10.1007/s10751-007-9527-2, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa15974
Zurlo, N., Amoretti, M., Amsler, C., Bonomi, G., Carraro, C., Cesar, C., Charlton, M., Doser, M., Fontana, A., Funakoshi, R., Genova, P., Hayano, R., Jørgensen, L., Kellerbauer, A., Lagomarsino, V., Landua, R., Rizzini, E., Macrì, M., Madsen, N...., & van der Werf, D. (2006). Production of slow protonium in vacuum. Hyperfine Interactions, 172(1-3)-105.
https://doi.org/10.1007/s10751-007-9529-0, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa15975
Amoretti, M., Amsler, C., Bonomi, G., Bowe, P., Canali, C., Carraro, C., Cesar, C., Charlton, M., Doser, M., Fontana, A., Fujiwara, M., Funakoshi, R., Genova, P., Hangst, J., Hayano, R., Johnson, I., Jørgensen, L., Kellerbauer, A., Lagomarsino, V...., & van der Werf, D. (2006). Progress with cold antihydrogen. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 247(1)-137.
https://doi.org/10.1016/j.nimb.2006.01.060, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa15976
Bertsche, W., Boston, A., Bowe, P., Cesar, C., Chapman, S., Charlton, M., Chartier, M., Deutsch, A., Fajans, J., Fujiwara, M., Funakoshi, R., Gomberoff, K., Hangst, J., Hayano, R., Jenkins, M., Jørgensen, L., Ko, P., Madsen, N., Nolan, P...., & van der Werf, D. (2006). A magnetic trap for antihydrogen confinement. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 566(2), 746-756.
https://doi.org/10.1016/j.nima.2006.07.012, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa1557
Clarke, J., Werf, D., Griffiths, B., Beddows, D., Charlton, M., Telle, H., Watkeys, P., Telle, H., & van der Werf, D. (2006). Design and operation of a two-stage positron accumulator. Review of Scientific Instruments, 77(6), 5 pages
https://doi.org/10.1063/1.2206561, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa1520
Zurlo, N., Amoretti, M., Amsler, C., Bonomi, G., Carraro, C., Cesar, C., Charlton, M., Doser, M., Fontana, A., Funakoshi, R., Genova, P., Hayano, R., Jørgensen, L., Kellerbauer, A., Lagomarsino, V., Landua, R., Rizzini, E., Macr��, M., Madsen, N...., & van der Werf, D. (2006). Evidence For The Production Of Slow Antiprotonic Hydrogen In Vacuum. Physical Review Letters, 97(15), 4 pages
https://doi.org/10.1103/PhysRevLett.97.153401, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa1554
Amoretti, M., Amsler, C., Bonomi, G., Bowe, P., Canali, C., Carraro, C., Cesar, C., Charlton, M., Ejsing, A., Fontana, A., Fujiwara, M., Funakoshi, R., Genova, P., Hangst, J., Hayano, R., Jørgensen, L., Kellerbauer, A., Lagomarsino, V., Rizzini, E...., & Madsen, N. (2006). Search for Laser-Induced Formation of Antihydrogen Atoms. Physical Review Letters, 97(21), 4 pages
https://doi.org/10.1103/PhysRevLett.97.213401, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa1582
Charlton, M., Werf, D., Lewis, R., Watkeys, P., Kerrigan, S., & van der Werf, D. (2006). Three-body effects in positron annihilation on molecules. Journal of Physics B: Atomic, Molecular and Optical Physics, 39(17)-L334.
https://doi.org/10.1088/0953-4075/39/17/L03, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa15943
Kellerbauer, A., Amoretti, M., Bonomi, G., Bowe, P., Canali, C., Carraro, C., Cesar, C., Charlton, M., Doser, M., Fontana, A., Fujiwara, M., Funakoshi, R., Genova, P., Hayano, R., Johnson, I., Jørgensen, L., Lagomarsino, V., Landua, R., Rizzini, E...., & van der Werf, D. (2006). Sideband cooling of ions in a non-neutral buffer gas. Physical Review A, 73(6)
https://doi.org/10.1103/PhysRevA.73.062508, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa15945
Cox, S., Gavartin, J., Lord, J., Cottrell, S., Gil, J., Alberto, H., Duarte, J., Vilão, R., Campos, N., Keeble, D., Davis, E., Charlton, M., Werf, D., & van der Werf, D. (2006). Oxide muonics: II. Modelling the electrical activity of hydrogen in wide-gap and high-permittivity dielectrics. Journal of Physics: Condensed Matter, 18(3)-1119.
https://doi.org/10.1088/0953-8984/18/3/022, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa15946
Bonomi, G., Amoretti, M., Bowe, P., Canali, C., Carraro, C., Cesar, C., Charlton, M., Doser, M., Fontana, A., Fujiwara, M., Funakoshi, R., Genova, P., Hangst, J., Hayano, R., Jørgensen, L., Kellerbauer, A., Lagomarsino, V., Landua, R., Lodi Rizzini, E...., & van der Werf, D. (2005). Antihydrogen production mechanisms in ATHENA. Nuclear Physics A, 752, 97-100.
https://doi.org/10.1016/j.nuclphysa.2005.02.046, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45312
Fajans, J., Bertsche, W., Burke, K., Chapman, S., Werf, D., & van der Werf, D. (2005). Effects of Extreme Magnetic Quadrupole Fields on Penning Traps and the Consequences for Antihydrogen Trapping. Physical Review Letters, 95(15)
https://doi.org/10.1103/PhysRevLett.95.155001, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa1556
Jørgensen, L., Amoretti, M., Bonomi, G., Bowe, P., Canali, C., Carraro, C., Cesar, C., Charlton, M., Doser, M., Fontana, A., Fujiwara, M., Funakoshi, R., Genova, P., Hangst, J., Hayano, R., Kellerbauer, A., Lagomarsino, V., Landua, R., Rizzini, E...., & van der Werf, D. (2005). New Source of Dense, Cryogenic Positron Plasmas. Physical Review Letters, 95(2)
https://doi.org/10.1103/PhysRevLett.95.025002, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa1555
Madsen, N., Amoretti, M., Amsler, C., Bonomi, G., Bowe, P., Carraro, C., Cesar, C., Charlton, M., Doser, M., Fontana, A., Fujiwara, M., Funakoshi, R., Genova, P., Hangst, J., Hayano, R., Jørgensen, L., Kellerbauer, A., Lagomarsino, V., Landua, R...., & Madsen, N. (2005). Spatial Distribution of Cold Antihydrogen Formation. Physical Review Letters, 94(3), 4 pages
https://doi.org/10.1103/PhysRevLett.94.033403, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa1581
Fujiwara, M., Amoretti, M., Amsler, C., Bonomi, G., Bouchta, A., Bowe, P., Carraro, C., Cesar, C., Charlton, M., Doser, M., Filippini, V., Fontana, A., Funakoshi, R., Genova, P., Hangst, J., Hayano, R., Jørgensen, L., Lagomarsino, V., Landua, R...., & van der Werf, D. (2004). First production and detection of cold antihydrogen atoms. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 214, 11-16.
https://doi.org/10.1016/S0168-583X(03)01775-0, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45320
Amoretti, M., Amsler, C., Bazzano, G., Bonomi, G., Bouchta, A., Bowe, P., Carraro, C., Cesar, C., Charlton, M., Doser, M., Filippini, V., Fontana, A., Fujiwara, M., Funakoshi, R., Genova, P., Hangst, J., Hayano, R., Jørgensen, L., Lagomarsino, V...., & van der Werf, D. (2004). High rate production of antihydrogen. Physics Letters B, 578(1-2), 23-32.
https://doi.org/10.1016/j.physletb.2003.10.062, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45321
Amoretti, M., Amsler, C., Bonomi, G., Bouchta, A., Bowe, P., Carraro, C., Cesar, C., Charlton, M., Doser, M., Filippini, V., Fontana, A., Fujiwara, M., Funakoshi, R., Genova, P., Hangst, J., Hayano, R., Jørgensen, L., Lagomarsino, V., Landua, R...., & van der Werf, D. (2004). Production and detection of cold antihydrogen atoms. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 518(1-2), 244-248.
https://doi.org/10.1016/j.nima.2003.10.072, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45322
Carraro, C., Amoretti, M., Amsler, C., Bonomi, G., Bouchta, A., Bowe, P., Cesar, C., Charlton, M., Doser, M., Filippini, V., Fontana, A., Fujiwara, M., Funakoshi, R., Genova, P., Hangst, J., Hayano, R., Jørgensen, L., Lagomarsino, V., Landua, R...., & van der Werf, D. (2004). Real-time detector for plasma diagnostic in antimatter experiment. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 518(1-2), 249-251.
https://doi.org/10.1016/j.nima.2003.10.073, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45323
Bonomi, G. & van der Werf, D. (2004). Temperature dependence of anti-hydrogen production in the ATHENA experiment. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 214, 17-21.
https://doi.org/10.1016/S0168-583X(03)01760-9, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45324
Amoretti, M., Amsler, C., Bonomi, G., Bouchta, A., Bowe, P., Carraro, C., Charlton, M., Collier, M., Doser, M., Filippini, V., Fine, K., Fontana, A., Fujiwara, M., Funakoshi, R., Genova, P., Glauser, A., Grögler, D., Hangst, J., Hayano, R...., & van der Werf, D. (2004). The ATHENA antihydrogen apparatus. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 518(3), 679-711.
https://doi.org/10.1016/j.nima.2003.09.052, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45325
Fujiwara, M., Amoretti, M., Amsler, C., Bonomi, G., Bouchta, A., Bowe, P., Carraro, C., Cesar, C., Charlton, M., Doser, M., Filippini, V., Fontana, A., Funakoshi, R., Genova, P., Hangst, J., Hayano, R., Jørgensen, L., Lagomarsino, V., Landua, R...., & van der Werf, D. (2004). The first cold antihydrogen. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 532(1-2), 229-236.
https://doi.org/10.1016/j.nima.2004.06.050, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45326
Lord, J., Cox, S., Charlton, M., Werf, D., Lichti, R., Amato, A., & van der Werf, D. (2004). The muon spin response to intermittent hyperfine interaction: modelling the high-temperature electrical activity of hydrogen in silicon. Journal of Physics: Condensed Matter, 16(40), S4739-S4760.
https://doi.org/10.1088/0953-8984/16/40/017, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45327
Amoretti, M., Amsler, C., Bonomi, G., Bouchta, A., Bowe, P., Carraro, C., Cesar, C., Charlton, M., Doser, M., Filippini, V., Fontana, A., Fujiwara, M., Funakoshi, R., Genova, P., Hangst, J., Hayano, R., Jørgensen, L., Kellerbauer, A., Lagomarsino, V...., & van der Werf, D. (2004). Dynamics of antiproton cooling in a positron plasma during antihydrogen formation. Physics Letters B, 590(3-4), 133-142.
https://doi.org/10.1016/j.physletb.2004.03.073, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa1553
Fujiwara, M., Amoretti, M., Bonomi, G., Bouchta, A., Bowe, P., Carraro, C., Cesar, C., Charlton, M., Doser, M., Filippini, V., Fontana, A., Funakoshi, R., Genova, P., Hangst, J., Hayano, R., Jørgensen, L., Lagomarsino, V., Landua, R., Lodi-Rizzini, E...., & Madsen, N. (2004). Three-Dimensional Annihilation Imaging of Trapped Antiprotons. Physical Review Letters, 92(6)
https://doi.org/10.1103/PhysRevLett.92.065005, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa1580
Amoretti, M., Amsler, C., Bazzano, G., Bonomi, G., Bouchta, A., Bowe, P., Canali, C., Carraro, C., Cesar, C., Charlton, M., Doser, M., Fontana, A., Fujiwara, M., Funakoshi, R., Genova, P., Hangst, J., Hayano, R., Johnson, I., Jørgensen, L...., & Madsen, N. (2004). Antihydrogen production temperature dependence. Physics Letters B, 583(1-2), 59-67.
https://doi.org/10.1016/j.physletb.2004.01.009, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa1579
Cox, S., Gidopoulos, N., Lord, J., Charlton, M., Van der Werf, D., Amato, A., Lichti, R., & van der Werf, D. (2003). The electrical activity of hydrogen and muonium in silicon at high temperatures. Physica B: Condensed Matter, 340-342, 641-645.
https://doi.org/10.1016/j.physb.2003.09.160, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45335
Amoretti, M., Bonomi, G., Bouchta, A., Bowe, P., Carraro, C., Cesar, C., Charlton, M., Doser, M., Fontana, A., Fujiwara, M., Funakoshi, R., Genova, P., Hangst, J., Hayano, R., Jørgensen, L., Lagomarsino, V., Landua, R., Rizzini, E., Macrı́, M...., & van der Werf, D. (2003). Complete nondestructive diagnostic of nonneutral plasmas based on the detection of electrostatic modes. Physics of Plasmas, 10(8), 3056-3064.
https://doi.org/10.1063/1.1591187, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45330
Regenfus, C., Amsler, C., Glauser, A., Grögler, D., Lindelöf, D., Pruys, H., & van der Werf, D. (2003). Detection of antihydrogen annihilations with a cryogenic pure-CsI crystal detector. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 504(1-3), 343-346.
https://doi.org/10.1016/S0168-9002(03)00766-6, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45331
Merrison, J., Charlton, M., Aggerholm, P., Knudsen, H., van der Werf, D., Clarke, J., Poulsen, M., & van der Werf, D. (2003). Development and applications of time-bunched and velocity-selected positron beams. Review of Scientific Instruments, 74(7), 3284-3292.
https://doi.org/10.1063/1.1581390, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45332
Morton, R., Werf, D., Rice-Evans, P., & van der Werf, D. (2003). Evidence for positronium formation at incommensurate monolayers of argon on graphite. Journal of Physics: Condensed Matter, 15(50), L771-L776.
https://doi.org/10.1088/0953-8984/15/50/L04, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45333
Madsen, N., Amoretti, M., Amsler, C., Bonomi, G., Bouchta, A., Bowe, P., Carraro, C., Cesar, C., Charlton, M., Doser, M., Filippini, V., Fontana, A., Fujiwara, M., Funakoshi, R., Genova, P., Hangst, J., Hayano, R., Jørgensen, L., Lagomarsino, V...., & van der Werf, D. (2003). Positron Plasma Diagnostics and Temperature Control for Antihydrogen Production. Physical Review Letters, 91(5), 5 pages
https://doi.org/10.1103/PhysRevLett.91.055001, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa1552
van der Werf, D. (2002). Positron annihilation study of the diffusion of oxygen in annealed silicon-doped gallium arsenide.
SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45336
van der Werf, D., Jørgensen, L., Watson, T., Charlton, M., Collier, M., Doser, M., Funakoshi, R., & van der Werf, D. (2002). The ATHENA positron accumulator. Applied Surface Science, 194(1-4), 312-316.
https://doi.org/10.1016/S0169-4332(02)00141-1, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45338
van der Werf, D. (2002). Three-body effects in the annihilation of positrons on molecules.
SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45339
Amoretti, M., Amsler, C., Bonomi, G., Bouchta, A., Bowe, P., Carraro, C., Cesar, C., Charlton, M., Collier, M., Doser, M., Filippini, V., Fine, K., Fontana, A., Fujiwara, M., Funakoshi, R., Genova, P., Hangst, J., Hayano, R., Holzscheiter, M...., & Madsen, N. (2002). Production and detection of cold antihydrogen atoms. Nature, 419(6906), 456-459.
https://doi.org/10.1038/nature01096, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa15105
Fujiwara, M., Amoretti, M., Amsler, C., Bendiscioli, G., Bonomi, G., Bouchta, A., Bowe, P., Carraro, C., Charlton, M., Collier, M., Doser, M., Filippini, V., Fine, K., Fontana, A., Funakoshi, R., Genova, P., Grögler, D., Hangst, J., Hayano, R...., & van der Werf, D. (2001). Producing slow antihydrogen for a test of CPT symmetry with ATHENA. Hyperfine Interactions, 138(1/4), 153-158.
https://doi.org/10.1023/A:1020819321506, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45341
Morton, R., van der Werf, D., Rice-Evans, P., & van der Werf, D. (2000). Phase transitions in monolayer hydrogen and deuterium on graphite. Physical Review B, 62(24), 17031-17034.
https://doi.org/10.1103/PhysRevB.62.17031, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45342
van der Werf, D. (1997). Positron studies of plasma-treated silicon wafers.
SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45344
van der Werf, D., van Leuken, H., de Groot, R., & van der Werf, D. (1995). Electric-field-gradient calculations on cadmium in cadmium-helium vacancy clusters in tungsten. Physical Review B, 52(6), 3909-3916.
https://doi.org/10.1103/PhysRevB.52.3909, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45347
Abd El Keriem, M., van der Werf, D., Pleiter, F., & van der Werf, D. (1993). Helium-vacancy interaction in tungsten. Physical Review B, 47(22), 14771-14777.
https://doi.org/10.1103/PhysRevB.47.14771, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45348
Abd El Keriem, M., van der Werf, D., Pleiter, F., & van der Werf, D. (1993). Hydrogen-vacancy interaction in W and Mo. Hyperfine Interactions, 79(1-4), 783-786.
https://doi.org/10.1007/BF00567608, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45349
Keriem, M., Werf, D., Pleiter, F., & van der Werf, D. (1993). Hydrogen-vacancy interaction in molybdenum. Journal of Physics: Condensed Matter, 5(12), 1801-1810.
https://doi.org/10.1088/0953-8984/5/12/008, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45350
Abd El Keriem, M., van der Werf, D., Pleiter, F., & van der Werf, D. (1993). Trap mutation in He-doped ion-implanted tungsten. Hyperfine Interactions, 79(1-4), 787-791.
https://doi.org/10.1007/BF00567609, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45351
Heslinga, D., Weitering, H., van der Werf, D., Klapwijk, T., Hibma, T., & van der Werf, D. (1990). Atomic-structure-dependent Schottky barrier at epitaxial Pb/Si(111) interfaces. Physical Review Letters, 64(13), 1589-1592.
https://doi.org/10.1103/PhysRevLett.64.1589, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45352
Akbari, R., Azevedo, L., Baker, C., Bertsche, W., Bhatt, N., Bonomi, G., Capra, A., Carli, I., Cesar, C., Charlton, M., Cridland, A., Vincio, A., Quiceno, D., Eriksson, S., Evans, A., Ewins, J., Fajans, J., Friesen, T., Fujiwara, M...., & Wurtele, J. (n.d.) Be+ assisted, simultaneous confinement of more than 15000 antihydrogen atoms. Nature Communications, 16(1)
https://doi.org/10.1038/s41467-025-65085-4, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa70963
https://doi.org/10.1038/s41467-025-65085-4

Authored Books

van der Werf, D. (2001). A positron accumulator for antihydrogen synthesis
SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45340
van der Werf, D. (1997). Defect profiling with low energy positrons of nitrogen implanted silicon
SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45343
van der Werf, D. (1997). Positronium formation at a graphite surface in the presence of physisorbed krypton
SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45345
van der Werf, D. (1997). Positronium production at condensed layers of hydrogen on graphite
SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45346

Book Chapters

Genova, P., Amoretti, M., Amsler, C., Bonomi, G., Bowe, P., Canali, C., Carraro, C., Cesar, C., Charlton, M., Doser, M., Fontana, A., Fujiwara, M., Funakoshi, R., Hangst, J., Hayano, R., Jørgensen, L., Kellerbauer, A., Lagomarsino, V., Landua, R...., & van der Werf, D. (2006). PRODUCTION AND STUDY OF ANTIHYDROGEN IN THE ATHENA EXPERIMENT. Nuclear Science and Safety in Europe -48).
https://doi.org/10.1007/978-1-4020-4965-1_3, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa15973

Conference Contributions

Miranda, D., Cesar, C., Sacramento, R., Ahmadi, M., Nolan, P., Pusa, P., Baquero-Ruiz, M., Carruth, C., Charman, A., Evans, L., Fajans, J., Povilus, A., So, C., Wurtele, J., Zhmoginov, A., Bertsche, W., Butler, E., Ishida, A., Capra, A...., & Thompson, R. (2016). Fundamental Tests of Physics with Antihydrogen at ALPHA. In Latin America Optics and Photonics Conference (pp. LTu3B.1
https://doi.org/10.1364/LAOP.2016.LTu3B.1, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45302
https://www.osapublishing.org/abstract.cfm?URI=LAOP-2016-LTu3B.1
Banerjee, D., Biraben, F., Charlton, M., Clade, P., Comini, P., Crivelli, P., Dalkarov, O., Debu, P., Dodd, L., Douillet, A., Dufour, G., Dupre, P., Eriksson, S., Froelich, P., Grandemange, P., Guellati, S., Guerout, R., Heinrich, J., Hervieux, P...., & Eriksson, S. (2016). Towards a test of the weak equivalence principle of gravity using anti-hydrogen at CERN. (pp. 1-2). 2016 Conference on Precision Electromagnetic Measurements (CPEM 2016).
https://doi.org/10.1109/CPEM.2016.7540781, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa32984
Friesen, T., Amole, C., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Bowe, P., Butler, E., Capra, A., Cesar, C., Charlton, M., Deller, A., Evetts, N., Eriksson, S., Fajans, J., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J., Hardy, W...., & van der Werf, D. (2013). Electron plasmas as a diagnostic tool for hyperfine spectroscopy of antihydrogen. -133).
https://doi.org/10.1063/1.4796068, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa15932
Silveira, D., Andresen, G., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Bowe, P., Butler, E., Cesar, C., Chapman, S., Charlton, M., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Hangst, J., Hardy, W., Hayden, M., Hydomako, R., Jonsell, S...., & Madsen, N. (2013). Evaporative cooling of antiprotons for the production of trappable antihydrogen. In AIP Conference Proceedings (pp. 165-174).
https://doi.org/10.1063/1.4796072, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa14622
Friesen, T., Amole, C., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Bowe, P., Butler, E., Capra, A., Cesar, C., Charlton, M., Deller, A., Evetts, N., Eriksson, S., Fajans, J., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J., Hardy, W...., & Eriksson, S. (2013). Electron plasmas as a diagnostic tool for hyperfine spectroscopy of antihydrogen. In AIP Conference Proceedings (pp. 123-133).
https://doi.org/10.1063/1.4796068, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa14623
Charlton, M., Andresen, G., Ashkezari, M., Baquero-Ruiz, M., Bertsche, W., Bowe, P., Butler, E., Carpenter, P., Cesar, C., Chapman, S., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M., Gill, D., Gutierrez, A., Hangst, J., Hardy, W., Hayano, R...., & Eriksson, S. (2012). Antiparticle plasmas for antihydrogen trapping. (pp. 7-16).
https://doi.org/10.1063/1.4707848, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa12767
FUJIWARA, M., ANDRESEN, G., ASHKEZARI, M., BAQUERO-RUIZ, M., BERTSCHE, W., BRAY, C., BUTLER, E., CESAR, C., CHAPMAN, S., CHARLTON, M., CESAR, C., FAJANS, J., FRIESEN, T., GILL, D., HANGST, J., HARDY, W., HAYANO, R., HAYDEN, M., HUMPHRIES, A...., & Madsen, N. (2011). ALPHA ANTIHYDROGEN EXPERIMENT. In CPT AND Lorentz Symmetry. (pp. 50-54). World Scientific Publishing Co..
https://doi.org/10.1142/9789814327688_0011, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa15102
Charlton, M., Werf, D., & van der Werf, D. (2010). Antihydrogen Physics. In Proceedings of the International School of Physics "Enrico Fermi" Course CLXXIV "Physics with Many Positrons" (pp. 189-215). IOS.
https://doi.org/10.3254/978-1-60750-646-1-189, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa8007
van der Werf, D. (2010). Antimatter plasmas used for antihydrogen formation.
SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45309
Fujiwara, M., Andresen, G., Bertsche, W., Bowe, P., Bray, C., Butler, E., Cesar, C., Chapman, S., Charlton, M., Fajans, J., Funakoshi, R., Gill, D., Hangst, J., Hardy, W., Hayano, R., Hayden, M., Humphries, A., Hydomako, R., Jenkins, M...., & Madsen, N. (2008). Particle Physics Aspects of Antihydrogen Studies with ALPHA at CERN. -220).
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Andresen, G., Bertsche, W., Bowe, P., Bray, C., Butler, E., Cesar, C., Chapman, S., Charlton, M., Fajans, J., Fujiwara, M., Funakoshi, R., Gill, D., Hangst, J., Hardy, W., Hayano, R., Hayden, M., Humphries, A., Hydomako, R., Jenkins, M...., & Madsen, N. (2008). First Attempts at Antihydrogen Trapping in ALPHA. -248).
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Andresen, G., Bertsche, W., Bowe, P., Bray, C., Butler, E., Cesar, C., Chapman, S., Charlton, M., Fajans, J., Fujiwara, M., Funakoshi, R., Gill, D., Hangst, J., Hardy, W., Hayano, R., Hayden, M., Humphries, A., Hydomako, R., Jenkins, M...., & Madsen, N. (2008). Antiproton compression and radial measurements. -105).
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MADSEN, N., ANDRESEN, G., BERTSCHE, W., BOSTON, A., BOWE, P., BUTLER, E., CESAR, C., CHAPMAN, S., CHARLTON, M., CHARTIER, M., FAJANS, J., FUNAKOSHI, R., GILL, D., HANGST, J., HARDY, W., HAYANO, R., HAYDEN, M., HYDOMAKO, R., JENKINS, M...., & Madsen, N. (2008). THE ALPHA ANTIHYDROGEN EXPERIMENT. (pp. 143-149).
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Fajans, J., Bertsche, W., Burke, K., Deutsch, A., Chapman, S., Gomberroff, K., werf, D., Wurtele, J., & van der Werf, D. (2006). Simple loss scaling laws for quadrupoles and higher-order multipoles used in antihydrogen traps.
SU Repository: https://cronfa.swan.ac.uk/Record/cronfa15977
Cesar, C. & van der Werf, D. (2005). Cold antihydrogen at ATHENA: Experimental observation and beyond.
https://doi.org/10.1063/1.1928839, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45313
Cox, S. & van der Werf, D. (2005). Hydrogen in oxides, modelled by muonium.
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Rotondi, A. & van der Werf, D. (2005). Results from ATHENA.
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Bertsche, W. & van der Werf, D. (2005). The ALPHA experiment: A cold antihydrogen trap.
https://doi.org/10.1063/1.2130184, SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45316
van der Werf, D. (2003). Cold antihydrogen at ATHENA: Experimental observation and beyond.
SU Repository: https://cronfa.swan.ac.uk/Record/cronfa45329

Supervision

Systematic studies of positron accumulation and transfer. (awarded 2024)

MSc

Other supervisor: Prof Niels Madsen