Timothy Tharp, Marquette UniversityFollow
M. Ahmadi, University of Liverpool
B. X. R. Alves, Aarhus University
C. J. Baker, Swansea University
W. Bertsche, University of Manchester, Cockcroft Institute
A. Capra, TRIUMF
C. Carruth, University of California - Berkeley
C. L. Cesar, Universidade Federal do Rio de Janeiro
M. Charlton, Swansea University
S. Cohen, Ben-Gurion University of the Negev
R. Collister, TRIUMF
S. Eriksson, Swansea University
A. Evans, University of Calgary
N. Evetts, University of British Columbia
J. Fajans, University of California - Berkeley
T. Friesen, Aarhus University
M. C. Fujiwara, TRIUMF
D. R. Gill, TRIUMF
J. S. Hangst, Aarhus University
W. N. Hardy, University of British Columbia
M. E. Hayden, Simon Fraser University
C. A. Isaac, Swansea University
M. A. Johnson, University of Manchester
S. A. Jones, Aarhus University, Swansea University
S. Jonsell, Stockholm University
L. Kurchaninov, TRIUMF
N. Madsen, Swansea University
M. Mathers, York University
D. Maxwell, Swansea University
J. T. K. McKenna, TRIUMF
S. Menary, York University
T. Momose, University of British Columbia
J. J. Munich, Simon Fraser University
K. Olchanski, TRIUMF
A. Olin, TRIUMF, University of Victoria
P. Pusa, University of Liverpool
C. O. Rasmussen, Aarhus University
F. Robicheaux, Purdue University
R. L. Sacramento, Universidade Federal do Rio de Janeiro
M. Sameed, Swansea University, University of Manchester
E. Sarid, Soreq NRC
D. M. Silveira, Universidade Federal do Rio de Janeiro
C. So, TRIUMF, University of Calgary
G. Stutter, Aarhus University
J. E. Thompson, York University
R. I. Thompson, TRIUMF, University of Calgary
D. P. van der Werf, Swansea University, IRFU
J. S. Wurtele, University of California - Berkeley

Document Type




Publication Date



American Physical Society

Source Publication

Physical Review Letters

Source ISSN



The simultaneous control of the density and particle number of non-neutral plasmas confined in Penning-Malmberg traps is demonstrated. Control is achieved by setting the plasma’s density by applying a rotating electric field while simultaneously fixing its axial potential via evaporative cooling. This novel method is particularly useful for stabilizing positron plasmas, as the procedures used to collect positrons from radioactive sources typically yield plasmas with variable densities and particle numbers; it also simplifies optimization studies that require plasma parameter scans. The reproducibility achieved by applying this technique to the positron and electron plasmas used by the ALPHA antihydrogen experiment at CERN, combined with other developments, contributed to a 10-fold increase in the antiatom trapping rate.


Published version. Physical Review Letters, Vol. 120, No. 2 (2018). DOI. © 2018 American Physical Society. Used with permission.

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