Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session CP11: Poster Session II: In-Person, Hall A (2:00-3:30pm) and Virtual Poster Presentations (3:45-5:00pm)
MFE: Low Aspect Ratio; Superconducting
FUND: Nonneutral, Antimatter, Strong coupled Plasmas; Waves
2:00 PM - 5:00 PM
Monday, October 17, 2022
Room: Exhibit Hall A and Online
Abstract: CP11.00080 : Adiabatic Cooling of Antihydrogen*
Presenter:
Danielle L Hodgkinson
(University of California, Berkeley)
Authors:
Danielle L Hodgkinson
(University of California, Berkeley)
William A Bertsche
(Univ of Manchester)
Joel Fajans
(University of California, Berkeley)
Collaboration:
The ALPHA Collaboration
We present a technique to adiabatically cool antihydrogen, by trapping in a small magnetic volume, before axially expanding the trap slowly compared to the axial bounce time of the anti-atoms (approx. 10 ms). Experimental results show that anti-atoms subject to the trap expansion annihilate on average during diagnostic ramp-down when the trap depth is (81 ± 7) mK, compared to (223 ± 9) mK and (173 ± 11) mK for two largely static control trials. We present detailed simulations of the experimental procedure, which qualitatively agree with the experimental annihilation-time data, and show a decrease of (37.9 ± 0.1) % in the mean energy of the population subject to a trap expansion. Two adiabatic models bracket the simulated energy decrease, confirming the simulated cooling is consistent with adiabatic expansion of an antihydrogen population that partially mixes energy between degrees of freedom.
*This work was supported by the DOE OFES and NSF-DOE Program in Basic Plasma Science and an Engineering and Physical Sciences Research Council (EPSRC) Doctoral Training Award.
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