EPJ Web of Conferences (Jan 2022)
Minimizing plasma temperature for antimatter mixing experiments
- Hunter E.D.,
- Amsler C.,
- Breuker H.,
- Chesnevskaya S.,
- Costantini G.,
- Ferragut R.,
- Giammarchi M.,
- Gligorova A.,
- Gosta G.,
- Higaki H.,
- Kanai Y.,
- Killian C.,
- Kletzl V.,
- Kraxberger V.,
- Kuroda N.,
- Lanz A.,
- Leali M.,
- Mäckel V.,
- Maero G.,
- Malbrunot C.,
- Mascagna V.,
- Matsuda Y.,
- Migliorati S.,
- Murtagh D.J.,
- Nagata Y.,
- Nanda A.,
- Nowak L.,
- Pasino E.,
- Romé M.,
- Simon M.C.,
- Tajima M.,
- Toso V.,
- Ulmer S.,
- Uggerhøj U.,
- Venturelli L.,
- Weiser A.,
- Widmann E.,
- Wolz T.,
- Yamazaki Y.,
- Zmeskal J.,
Affiliations
- Hunter E.D.
- Stefan Meyer Institute
- Amsler C.
- Stefan Meyer Institute
- Breuker H.
- Ulmer Fundamental Symmetries Laboratory, RIKEN
- Chesnevskaya S.
- Stefan Meyer Institute
- Costantini G.
- Dipartimento di Ingegneria dell’Informazione, Università degli Studi di Brescia and INFN Pavia
- Ferragut R.
- Politechnico di Milano
- Giammarchi M.
- INFN Milano
- Gligorova A.
- Stefan Meyer Institute
- Gosta G.
- Dipartimento di Ingegneria dell’Informazione, Università degli Studi di Brescia and INFN Pavia
- Higaki H.
- Graduate School of Advanced Science and Engineering, Hiroshima University
- Kanai Y.
- Nishina Center for Accelerator-Based Science, RIKEN
- Killian C.
- Stefan Meyer Institute
- Kletzl V.
- Stefan Meyer Institute
- Kraxberger V.
- Stefan Meyer Institute
- Kuroda N.
- Institute of Physics, the University of Tokyo
- Lanz A.
- Stefan Meyer Institute
- Leali M.
- Dipartimento di Ingegneria dell’Informazione, Università degli Studi di Brescia and INFN Pavia
- Mäckel V.
- Stefan Meyer Institute
- Maero G.
- INFN Milano
- Malbrunot C.
- Experimental Physics Department, CERN
- Mascagna V.
- Dipartimento di Ingegneria dell’Informazione, Università degli Studi di Brescia and INFN Pavia
- Matsuda Y.
- Institute of Physics, the University of Tokyo
- Migliorati S.
- Dipartimento di Ingegneria dell’Informazione, Università degli Studi di Brescia and INFN Pavia
- Murtagh D.J.
- Stefan Meyer Institute
- Nagata Y.
- Department of Physics, Tokyo University of Science
- Nanda A.
- Stefan Meyer Institute
- Nowak L.
- Experimental Physics Department, CERN
- Pasino E.
- INFN Milano
- Romé M.
- INFN Milano
- Simon M.C.
- Stefan Meyer Institute
- Tajima M.
- Nishina Center for Accelerator-Based Science, RIKEN
- Toso V.
- Politechnico di Milano
- Ulmer S.
- Ulmer Fundamental Symmetries Laboratory, RIKEN
- Uggerhøj U.
- Department of Physics and Astronomy, Aarhus University
- Venturelli L.
- Dipartimento di Ingegneria dell’Informazione, Università degli Studi di Brescia and INFN Pavia
- Weiser A.
- Stefan Meyer Institute
- Widmann E.
- Stefan Meyer Institute
- Wolz T.
- Experimental Physics Department, CERN
- Yamazaki Y.
- Ulmer Fundamental Symmetries Laboratory, RIKEN
- Zmeskal J.
- Stefan Meyer Institute
- DOI
- https://doi.org/10.1051/epjconf/202226201007
- Journal volume & issue
-
Vol. 262
p. 01007
Abstract
The ASACUSA collaboration produces a beam of antihydrogen atoms by mixing pure positron and antiproton plasmas in a strong magnetic field with a double cusp geometry. The positrons cool via cyclotron radiation inside the cryogenic trap. Low positron temperature is essential for increasing the fraction of antihydrogen atoms which reach the ground state prior to exiting the trap. Many experimental groups observe that such plasmas reach equilibrium at a temperature well above the temperature of the surrounding electrodes. This problem is typically attributed to electronic noise and plasma expansion, which heat the plasma. The present work reports anomalous heating far beyond what can be attributed to those two sources. The heating seems to be a result of the axially open trap geometry, which couples the plasma to the external (300 K) environment via microwave radiation.
