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Cold and stable antimatter for fundamental physics.
Proc Jpn Acad Ser B Phys Biol Sci
July 2024
RIKEN.
The field of cold antimatter physics has rapidly developed in the last 20 years, overlapping with the period of the Antiproton Decelerator (AD) at CERN. The central subjects are CPT symmetry tests and Weak Equivalence Principle (WEP) tests. Various groundbreaking techniques have been developed and are still in progress such as to cool antiprotons and positrons down to extremely low temperature, to manipulate antihydrogen atoms, to construct extremely high-precision Penning traps, etc.
View Article and Find Full Text PDFPolarized Light from the Transportation of a Matter-Antimatter Beam in a Plasma.
Phys Rev Lett
May 2019
Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany.
A relativistic electron-positron beam propagating through a magnetized electron-ion plasma is shown to generate both circularly and linearly polarized synchrotron radiations, which is intrinsically linked with asymmetric energy dissipation of the pair beam during the filamentation instability dynamics in the background plasma. The ratio of both polarizations |⟨P_{circ}⟩/⟨P_{lin}⟩|∼0.15, occurring for a wide range of beam-plasma parameters, can help in understanding the recent observation of circularly polarized radiation from gamma-ray bursts.
View Article and Find Full Text PDFCommentary regarding "on-orbit sleep problems of astronauts and countermeasures".
Mil Med Res
October 2018
Department of Electrical Engineering, Biophotonics Lab, University of Wisconsin Milwaukee, 3200 N Cramer St, Milwaukee, WI53211, USA.
This commentary addresses the article by Wu et al. entitled "On-orbit sleep problems of astronauts and countermeasures". In this article, the authors discussed the sleep problems of astronauts.
View Article and Find Full Text PDFInterchange Instability and Transport in Matter-Antimatter Plasmas.
Phys Rev Lett
June 2017
Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstrasse 25, 6020 Innsbruck, Austria.
Symmetric electron-positron plasmas in inhomogeneous magnetic fields are intrinsically subject to interchange instability and transport. Scaling relations for the propagation velocity of density perturbations relevant to transport in isothermal magnetically confined electron-positron plasmas are deduced, including damping effects when Debye lengths are large compared to Larmor radii. The relations are verified by nonlinear full-F gyrofluid computations.
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