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  • Letter
  • Open Access

Measurements of Penning-Malmberg trap patch potentials and associated performance degradation

C. J. Baker1, W. Bertsche2,3, A. Capra4, C. L. Cesar5, M. Charlton1, A. Christensen6,*, R. Collister4, A. Cridland Mathad1, S. Eriksson1 et al. (ALPHA Collaboration)

S. Eriksson1, A. Evans7, N. Evetts7, J. Fajans6,†, T. Friesen8, M. C. Fujiwara4, D. R. Gill4, P. Grandemange4, P. Granum9, J. S. Hangst9, M. E. Hayden10, D. Hodgkinson2, E. D. Hunter6, C. A. Isaac1, M. A. Johnson2, J. Jones1, S. A. Jones1, S. Jonsell11, A. Khramov4, L. Kurchaninov4, H. Landsberger6, N. Madsen1, D. Maxwell1, J. T. K. McKenna9,4, S. Menary12, T. Momose7, P. S. Mullan1, J. J. Munich10, K. Olchanski4, A. Olin4,13, J. Peszka1, A. Powell1,8, P. Pusa14, C.Ø. Rasmussen15, F. Robicheaux16, R. L. Sacramento5, M. Sameed1, E. Sarid17, D. M. Silveira5, C. So8, G. Stutter9, T. D. Tharp18, R. I. Thompson8, C. Torkzaban6, D. P. van der Werf1, E. Ward6, and J. S. Wurtele6 (ALPHA Collaboration)

  • 1Department of Physics, Faculty of Science and Engineering, Swansea University, Swansea SA2 8PP, United Kingdom
  • 2School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom
  • 3Cockcroft Institute, Sci-Tech Daresbury, Warrington WA4 4AD, United Kingdom
  • 4TRIUMF, 4004 Wesbrook Mall, Vancouver BC, V6T 2A3, Canada
  • 5Instituto de Física, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-972, Brazil
  • 6Department of Physics, University of California at Berkeley, Berkeley, California 94720-7300, USA
  • 7Department of Physics and Astronomy, University of British Columbia, Vancouver BC, V6T 1Z1, Canada
  • 8Department of Physics and Astronomy, University of Calgary, Calgary AB, T2N 1N4, Canada
  • 9Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark
  • 10Department of Physics, Simon Fraser University, Burnaby BC, V5A 1S6, Canada
  • 11Department of Physics, Stockholm University, SE-10691, Stockholm, Sweden
  • 12Department of Physics and Astronomy, York University, Toronto, ON M3J 1P3, Canada
  • 13Department of Physics and Astronomy, University of Victoria, Victoria BC, V8P 5C2, Canada
  • 14Department of Physics, University of Liverpool, Liverpool L69 7ZE, United Kingdom
  • 15CERN, Experimental Physics Department, CH-1211 Genève 23, Switzerland
  • 16Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA
  • 17Soreq NRC, Yavne, 81800, Israel
  • 18Physics Department, Marquette University, P.O. Box 1881,Milwaukee, Wisconsin 53201-1881, USA

  • *a.c@berkeley.edu
  • †joel@physics.berkeley.edu
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Phys. Rev. Research 6, L012008 – Published 16 January, 2024

DOI: https://doi.org/10.1103/PhysRevResearch.6.L012008

Abstract

Antiprotons created by laser ionization of antihydrogen are observed to rapidly escape the ALPHA trap. Further, positron plasmas heat more quickly after the trap is illuminated by laser light for several hours. These phenomena can be caused by patch potentials—variations in the electrical potential along metal surfaces. A simple model of the effects of patch potentials explains the particle loss, and an experimental technique using trapped electrons is developed for measuring the electric field produced by the patch potentials. The model is validated by controlled experiments and simulations.

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Phys. Rev. Research 6, L012008– Published 16 January, 2024
  • Received 5 July 2022
  • Accepted 23 October 2023
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