Evaporative cooling of antiprotons to cryogenic temperatures

• Published in: Physical review letters 2010-07, Vol.105 (1), p.013003-013003, Article 013003
• Main Authors: Andresen, G B, Ashkezari, M D, Baquero-Ruiz, M, Bertsche, W, Bowe, P D, Butler, E, Cesar, C L, Chapman, S, Charlton, M, Fajans, J, Friesen, T, Fujiwara, M C, Gill, D R, Hangst, J S, Hardy, W N, Hayano, R S, Hayden, M E, Humphries, A, Hydomako, R, Jonsell, S, Kurchaninov, L, Lambo, R, Madsen, N, Menary, S, Nolan, P, Olchanski, K, Olin, A, Povilus, A, Pusa, P, Robicheaux, F, Sarid, E, Silveira, D M, So, C, Storey, J W, Thompson, R I, van der Werf, D P, Wilding, D, Wurtele, J S, Yamazaki, Y
• Format: Article
• Language: English
• Subjects: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ANTIBARYONS; ANTIMATTER; ANTINUCLEI; ANTINUCLEONS; ANTIPARTICLES; ANTIPROTONS; Atom- och molekylfysik; Atomfysik; Atomic and molecular physics; Atomic physics; BARYONS; CHARGED PARTICLES; CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COOLING; CRYOGENICS; EFFICIENCY; ELEMENTARY PARTICLES; EVAPORATION; EVAPORATIVE COOLING; FERMIONS; Fysik; HADRONS; IONS; KINETICS; MATTER; NATURAL SCIENCES; NATURVETENSKAP; NUCLEI; NUCLEONS; PHASE TRANSFORMATIONS; Physics; PLASMA; PROTONS; REACTION KINETICS; TEMPERATURE RANGE; TEMPERATURE RANGE 0013-0065 K; TRAPPING
• ISSN: 0031-9007; 1079-7114; 1079-7114
• DOI: 10.1103/PhysRevLett.105.013003

We report the application of evaporative cooling to clouds of trapped antiprotons, resulting in plasmas with measured temperature as low as 9 K. We have modeled the evaporation process for charged particles using appropriate rate equations. Good agreement between experiment and theory is observed, permitting prediction of cooling efficiency in future experiments. The technique opens up new possibilities for cooling of trapped ions and is of particular interest in antiproton physics, where a precise CPT test on trapped antihydrogen is a long-standing goal.