# Professor Michael Charlton

## Publications

### Journal Articles

1. & Low-energy l-mixing collisions of excited positronium with protons and antiprotons. Journal of Physics B: Atomic, Molecular and Optical Physics 50(13)
2. & Cold neutral atoms via charge exchange from excited state positronium: a proposal. New Journal of Physics 19(5)
3. et. al. Observation of the 1S–2S transition in trapped antihydrogen. Nature 541(7638), 506-510.
4. et. al. Limit on the electric charge of antihydrogen. Hyperfine Interactions 238(1)
5. & Heating due to momentum transfer in low-energy positronium-antiproton scattering. Physical Review A 94(3)
6. & 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)
7. & An improved limit on the charge of antihydrogen from stochastic acceleration. Nature 529, 373-376.
8. & Calculation of antihydrogen formation via antiproton scattering with excited positronium. Physical Review A 93(1)
9. & Physics with antihydrogen. Journal of Physics B: Atomic, Molecular and Optical Physics 48(23)
10. & Exciting positronium with a solid-state UV laser: the Doppler-broadened Lyman-αtransition. Journal of Physics B: Atomic, Molecular and Optical Physics 48(17)
11. & Antihydrogen Formation via Antiproton Scattering with Excited Positronium. Physical Review Letters 114(18)
12. & Advances in antihydrogen physics. Science Progress 98(1), 34-62.
13. & On the production of the positive antihydrogen ion ${{{\rm \bar{H}}}^{+}}$ via radiative attachment. Journal of Physics B: Atomic, Molecular and Optical Physics 47(22)
14. & Radially selective inward transport of positrons in a Penning–Malmberg trap. New Journal of Physics 16(7)
15. et. al. An experimental limit on the charge of antihydrogen. Nature Communications 5
16. et. al. In situelectromagnetic field diagnostics with an electron plasma in a Penning–Malmberg trap. New Journal of Physics 16(1)
17. et. al. The ALPHA antihydrogen trapping apparatus. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 735, 319-340.
18. Resonant quantum transitions in trapped antihydrogen atoms. Nature 483(7390)-443.
19. & The behaviour of positron clouds in the single-particle regime under the influence of rotating wall electric fields. New Journal of Physics 14(7)
20. et. al. Resonant quantum transitions in trapped antihydrogen atoms. Nature 483(7390), 439-443.
21. & Directed fluxes of positronium using pulsed travelling optical lattices. New Journal of Physics 14(4)
22. Discriminating between antihydrogen and mirror-trapped antiprotons in a minimum-B trap. New Journal of Physics 14(1)
23. & Further evidence for low-energy protonium production in vacuum. The European Physical Journal Plus 127(10)
24. Antiparticle sources for antihydrogen production and trapping. Journal of Physics: Conference Series 262
25. et. al. Search for trapped antihydrogen. Physics Letters B 695(1-4), 95-104.
26. & The temperature and density dependence of positron annihilation in CO2and SF6. Journal of Physics B: Atomic, Molecular and Optical Physics 44(17)
27. et. al. Confinement of antihydrogen for 1,000 seconds. Nature Physics 7(7), 558-564.
28. et. al. Autoresonant Excitation of Antiproton Plasmas. Physical Review Letters 106(2)
29. & Compression of Positron Clouds in the Independent Particle Regime. Physical Review Letters 107(3)
30. Centrifugal Separation and Equilibration Dynamics in an Electron-Antiproton Plasma. Physical Review Letters 106(14)
31. Towards antihydrogen trapping and spectroscopy at ALPHA. Hyperfine Interactions 199(1-3)-48.
32. Search for trapped antihydrogen in ALPHA. Canadian Journal of Physics 89(1), 7-16.
33. Trapped antihydrogen. Nature 468(7324), 673-676.
34. & Target Structure Induced Suppression of the Ionization Cross Section for Very Low Energy Antiproton-Hydrogen Collisions. Physical Review Letters 105(21)
35. & Magnetised positronium. Journal of Physics: Conference Series 199
36. Antimatter transport processes. Journal of Physics: Conference Series 257
37. Evaporative Cooling of Antiprotons to Cryogenic Temperatures. Physical Review Letters 105(1)
38. & Simulations of antihydrogen formation in a nested Penning trap. Journal of Physics: Conference Series 199
39. Antihydrogen formation dynamics in a multipolar neutral anti-atom trap. Physics Letters B 685(2-3)-145.
40. Magnetic multipole induced zero-rotation frequency bounce-resonant loss in a Penning–Malmberg trap used for antihydrogen trapping. Physics of Plasmas 16(10)
41. Positron transport in gases. Journal of Physics: Conference Series 162
42. Antihydrogen Physics at ALPHA/CERNThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at University of Windsor, Windsor, Ontario, Canada on 21–26 July 2008.. Canadian Journal of Physics 87(7)-797.
43. & Simulation of the formation of antihydrogen in a nested Penning trap: effect of positron density. Journal of Physics B: Atomic, Molecular and Optical Physics 42(21)
44. & On the double ionization of helium by very slow antiproton impact. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 267(2)-247.
45. Antiproton, positron, and electron imaging with a microchannel plate/phosphor detector. Review of Scientific Instruments 80(12)
46. Production of antihydrogen at reduced magnetic field for anti-atom trapping. Journal of Physics B: Atomic, Molecular and Optical Physics 41(1)
47. & Ionization of Helium and Argon by Very Slow Antiproton Impact. Physical Review Letters 101(4)
48. A novel antiproton radial diagnostic based on octupole induced ballistic loss. Physics of Plasmas 15(3)
49. & Weakly bound positron–electron pairs in a strong magnetic field. Journal of Physics B: Atomic, Molecular and Optical Physics 41(24)
50. Towards trapped antihydrogen. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 266(3)-362.
51. & Antihydrogen for precision tests in physics. Contemporary Physics 49(1)-41.
52. Compression of Antiproton Clouds for Antihydrogen Trapping. Physical Review Letters 100(20)
53. Temporally Controlled Modulation of Antihydrogen Production and the Temperature Scaling of Antiproton-Positron Recombination. Physical Review Letters 101(5)
54. Evidence For The Production Of Slow Antiprotonic Hydrogen In Vacuum. Physical Review Letters 97(15)
55. Dynamics of antiproton cooling in a positron plasma during antihydrogen formation. Physics Letters B 590(3-4), 133-142.
56. Positron Plasma Diagnostics and Temperature Control for Antihydrogen Production. Physical Review Letters 91(5)

### Conference Contributions

1. (2012). Antiparticle plasmas for antihydrogen trapping. , 7-16.
2. (2012). Antihydrogen formation by autoresonant excitation of antiproton plasmas. Presented at Hyperfine Interactions,(1-3), 61-67.
3. (2012). Microwave-plasma interactions studied via mode diagnostics in ALPHA. Presented at Hyperfine Interactions,(1-3), 117-123.
4. (2012). Antihydrogen detection in ALPHA. Presented at Hyperfine Interactions,(1-3), 91-99.
5. (2012). Progress towards microwave spectroscopy of trapped antihydrogen. Presented at Hyperfine Interactions,(1-3), 81-90.
6. (2012). Trapped antihydrogen. Presented at Hyperfine Interactions,(1-3), 15-29.
7. & (2012). Compression of positron clouds using rotating wall electric fields. Presented at Hyperfine Interactions,(1-3), 125-132.
8. (2012). Alternative method for reconstruction of antihydrogen annihilation vertices. Presented at Hyperfine Interactions,(1-3), 101-107.
9. (2008). Particle Physics Aspects of Antihydrogen Studies with ALPHA at CERN. -220.
10. (2008). First Attempts at Antihydrogen Trapping in ALPHA. -248.
11. (2008). Antiproton compression and radial measurements. -105.