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Antiproton cloud compression in the ALPHA apparatus at CERN

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TCP 2014

Abstract

We have observed a new mechanism for compression of a non-neutral plasma, where antiprotons embedded in an electron plasma are compressed by a rotating wall drive at a frequency close to the sum of the axial bounce and rotation frequencies. The radius of the antiproton cloud is reduced by up to a factor of 20 and the smallest radius measured is ∼0.2 mm. When the rotating wall drive is applied to either a pure electron or pure antiproton plasma, no compression is observed in the frequency range of interest. The frequency range over which compression is evident is compared to the sum of the antiproton bounce frequency and the system’s rotation frequency. It is suggested that bounce resonant transport is a likely explanation for the compression of antiproton clouds in this regime.

Proceedings of the 6th International Conference on Trapped Charged Particles and Fundamental Physics (TCP 2014), Takamatsu, Japan, 1-5 December 2014

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Author information

Authors and Affiliations

  1. Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, V6T 1Z1, Canada

    A. Gutierrez, N. Evetts & W. N. Hardy

  2. Department of Physics, Simon Fraser University, Burnaby, British Columbia, V5A 1S6, Canada

    M. D. Ashkezari, R. Dunlop & M. E. Hayden

  3. Department of Physics, University of California at Berkeley, Berkeley, CA, 94720-7300, USA

    M. Baquero-Ruiz, J. Fajans, A. Little, C. So, M. Turner, J. S. Wurtele & A. I. Zhmoginov

  4. School of Physics and Astronomy, University of Manchester, M13 9PL, Manchester, UK

    W. Bertsche & P. Tooley

  5. The Cockcroft Institute, WA4 4AD, Warrington, UK

    W. Bertsche

  6. Department of Physics, College of Science, Swansea University, Swansea, SA2 8PP, UK

    C. Burrows, M. Charlton, S. Eriksson, C. A. Isaac, N. Madsen & D. P. van der Werf

  7. Centre for Cold Matter, Imperial College, London, SW7 2BW, UK

    E. Butler & J. Tarlton

  8. Physics Department, CERN, CH-1211, Geneva 23, Switzerland

    E. Butler

  9. Department of Physics and Astronomy, York University, Toronto, Ontario, M3J 1P3, Canada

    A. Capra & S. Menary

  10. Instituto de Física, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21941-972, Brazil

    C. L. Cesar, R. L. Sacramento & D. M. Silveira

  11. Department of Physics and Astronomy, Aarhus University, DK-8000, Aarhus C, Denmark

    T. Friesen, J. S. Hangst, C. Ø. Rasmussen & T. D. Tharp

  12. 12 TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3, Canada

    M. C. Fujiwara, D. R. Gill, L. Kurchaninov, J. T. K. McKenna, K. Olchanski, A. Olin & S. Stracka

  13. Department of Physics, Stockholm University, SE-10691, Stockholm, Sweden

    S. Jonsell & S. C. Napoli

  14. Department of Physics, University of Liverpool, Liverpool, L69 7ZE, UK

    P. Nolan & P. Pusa

  15. Department of Physics, Purdue University, West Lafayette, Indiana, 47907, USA

    F. Robicheaux

  16. Department of Physics, NRCN-Nuclear Research Center Negev, Beer Sheva, IL-84190, Israel

    E. Sarid

  17. Department of Physics and Astronomy, University of Calgary, Calgary, Alberta, T2N 1N4, Canada

    R. I. Thompson

Authors
  1. A. Gutierrez
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  2. M. D. Ashkezari
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  3. M. Baquero-Ruiz
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  4. W. Bertsche
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  5. C. Burrows
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  6. E. Butler
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  7. A. Capra
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  8. C. L. Cesar
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  9. M. Charlton
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  10. R. Dunlop
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  11. S. Eriksson
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  12. N. Evetts
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  13. J. Fajans
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  14. T. Friesen
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  15. M. C. Fujiwara
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  16. D. R. Gill
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  17. J. S. Hangst
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  18. W. N. Hardy
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  19. M. E. Hayden
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  20. C. A. Isaac
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  21. S. Jonsell
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  22. L. Kurchaninov
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  23. A. Little
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  24. N. Madsen
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  25. J. T. K. McKenna
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  26. S. Menary
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  27. S. C. Napoli
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  28. P. Nolan
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  29. K. Olchanski
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  30. A. Olin
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  31. P. Pusa
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  32. C. Ø. Rasmussen
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  33. F. Robicheaux
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  34. R. L. Sacramento
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  35. E. Sarid
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  36. D. M. Silveira
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  37. C. So
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  38. S. Stracka
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  39. J. Tarlton
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  40. T. D. Tharp
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  41. R. I. Thompson
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  42. P. Tooley
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  43. M. Turner
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  44. D. P. van der Werf
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  45. J. S. Wurtele
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  46. A. I. Zhmoginov
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Corresponding author

Correspondence to A. Gutierrez .

Editor information

Editors and Affiliations

  1. RIKEN Nishina Center for Accelerator-Based Science, Saitama, Japan

    Michiharu Wada

  2. RIKEN Nishina Center for Accelerator-Based Science, Saitama, Japan

    Peter Schury

  3. RIKEN Nishina Center for Accelerator-Based Science, Saitama, Japan

    Yuichi Ichikawa

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© 2017 Springer International Publishing AG

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Gutierrez, A. et al. (2017). Antiproton cloud compression in the ALPHA apparatus at CERN. In: Wada, M., Schury, P., Ichikawa, Y. (eds) TCP 2014. Springer, Cham. https://doi.org/10.1007/978-3-319-61588-2_14

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