ORCID Profile
0000-0003-2727-790X
Current Organisations
Kyoto University
,
University of Tokyo
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Publisher: Springer Science and Business Media LLC
Date: 17-12-2018
Publisher: Elsevier BV
Date: 2023
Publisher: IOP Publishing
Date: 13-05-2019
Publisher: AIP Publishing
Date: 08-2022
DOI: 10.1063/5.0093360
Abstract: Magnetized nonneutral plasma composed of electrons or positrons couples to the local microwave environment via cyclotron radiation. The equilibrium plasma temperature depends on the microwave energy density near the cyclotron frequency. Fine copper meshes and cryogenic microwave absorbing material were used to lower the effective temperature of the radiation environment in ASACUSA's Cusp trap, resulting in significantly reduced plasma temperature.
Publisher: Springer Science and Business Media LLC
Date: 03-2021
DOI: 10.1140/EPJD/S10053-021-00101-Y
Abstract: The ASACUSA (Atomic Spectroscopy And Collisions Using Slow Antiprotons) collaboration plans to measure the ground-state hyperfine splitting of antihydrogen in a beam at the CERN Antiproton Decelerator with initial relative precision of $$10^{-6}$$ 10 - 6 or better, to test the fundamental CPT (combination of charge conjugation, parity transformation and time reversal) symmetry between matter and antimatter. This challenging goal requires a polarised antihydrogen beam with a sufficient number of antihydrogen atoms in the ground state. The first measurement of the quantum state distribution of antihydrogen atoms in a low magnetic field environment of a few mT is described. Furthermore, the data-driven machine learning analysis to identify antihydrogen events is discussed.
Publisher: EDP Sciences
Date: 2018
DOI: 10.1051/EPJCONF/201818101003
Abstract: The ASACUSA Collaboration at CERNs Antiproton Decelerator aims to measure the ground state hyperfine splitting of antihydrogen with high precision to test the fundamental symmetry of CPT (combination of charge conjugation, parity transformation, and time reversal). For this purpose an antihydrogen detector has been developed. Its task is to count the arriving antihydrogen atoms and therefore distinguish backgroundevents (mainly cosmics) from antiproton annihilations originating from antihydrogen atoms which are produced only in small amounts. A central BGO crystal disk with position sensitive read-out detects the annihilation and a surrounding two-layered hodoscope is used for tracking charged secondaries. The hodoscope has been recently upgraded to allow precise vertex reconstruction. A machine learning analysis based on measured antiproton annihilations and cosmic rays has been developed to identify antihydrogen events.
Publisher: Springer Science and Business Media LLC
Date: 07-11-2016
Publisher: Cambridge University Press (CUP)
Date: 10-2023
Publisher: IOP Publishing
Date: 07-09-2015
No related grants have been discovered for Naofumi Kuroda.