CERN Accelerating science

Article
Title Measurements of Penning-Malmberg trap patch potentials and associated performance degradation
Author(s)

Baker, C J (Swansea U.) ; Bertsche, W (Manchester U. ; Cockcroft Inst. Accel. Sci. Tech. ; Liverpool U.) ; Capra, A (TRIUMF) ; Cesar, C L (Rio de Janeiro Federal U.) ; Charlton, M (Swansea U.) ; Christensen, A (UC, Berkeley) ; Collister, R (TRIUMF) ; Cridland Mathad, A (Swansea U.) ; Eriksson, S (Swansea U.) ; Evans, A (British Columbia U.) ; Evetts, N (British Columbia U.) ; Fajans, J (UC, Berkeley) ; Friesen, T (Calgary U.) ; Fujiwara, M C (TRIUMF) ; Gill, D R (TRIUMF) ; Grandemange, P (TRIUMF) ; Granum, P (Aarhus U.) ; Hangst, J S (Aarhus U.) ; Hayden, M E (Simon Fraser U.) ; Hodgkinson, D (Manchester U.) ; Hunter, E D (UC, Berkeley) ; Isaac, C A (Swansea U.) ; Johnson, M A (Manchester U.) ; Jones, J (Swansea U.) ; Jones, S A (Swansea U.) ; Jonsell, S (Stockholm U. ; Stockholm U., OKC) ; Khramov, A (TRIUMF) ; Kurchaninov, L (TRIUMF) ; Landsberger, H (UC, Berkeley) ; Madsen, N (Swansea U.) ; Maxwell, D (Swansea U.) ; McKenna, J T K (Aarhus U. ; TRIUMF) ; Menary, S (York U., Canada) ; Momose, T (British Columbia U.) ; Mullan, P S (Swansea U.) ; Munich, J J (Simon Fraser U.) ; Olchanski, K (TRIUMF) ; Olin, A (TRIUMF ; Victoria U.) ; Peszka, J (Swansea U.) ; Powell, A (Swansea U. ; Calgary U.) ; Pusa, P (Liverpool U.) ; Rasmussen, C Ø (CERN) ; Robicheaux, F (Purdue U.) ; Sacramento, R L (Rio de Janeiro Federal U.) ; Sameed, M (Swansea U.) ; Sarid, E (Soreq Nucl. Res. Ctr.) ; Silveira, D M (Rio de Janeiro Federal U.) ; So, C (Calgary U.) ; Stutter, G (Aarhus U.) ; Tharp, T D (Wisconsin U., Milwaukee) ; Thompson, R I (Calgary U.) ; Torkzaban, C (UC, Berkeley) ; van der Werf, D P (Swansea U.) ; Ward, E (UC, Berkeley) ; Wurtele, J S (UC, Berkeley)

Publication 2024
Number of pages 8
In: Phys. Rev. Res. 6 (2024) L012008
DOI 10.1103/PhysRevResearch.6.L012008 (publication)
Subject category Physics in General
Accelerator/Facility, Experiment ALPHA
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.
Copyright/License publication: © 2024 authors (License: CC-BY-4.0)

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