Volume 402 - The 22nd International Workshop on Neutrinos from Accelerators (NuFact2021) - All Sessions
Extinction Measurement at J-PARC MR with Slow-Extracted Pulsed Proton Beam for COMET Experiment
K. Noguchi*, Y. Fujii, Y. Fukao, Y. Hashimoto, Y. Higuchi, R. Honda, Y. Igarashi, F. Ikeda, S. Mihara, R. Muto, Y. Nakazawa, H. Nishiguchi, K. Oishi, M. Shoji, F. Tamura, J. Tojo, M. Tomizawa, K. Ueno and H. Yoshida
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Published on: March 31, 2022
Abstract
The COMET experiment aims to search for the neutrinoless conversion of a muon to an electron in a muonic atom. This experiment utilizes a bunched slow-extracted (bunched-SX) proton beam at 8 GeV from the J-PARC main ring synchrotron. To achieve a sensitivity of $10^{−17}$, the fraction of inter-bunch stray protons, called extinction, must be less than $10^{−10}$ . The 8 GeV proton beam commissioning with a bunched-SX beam for the COMET experiment was performed in May 2021. The extinction was measured by counting all secondary pions in the K1.8BR secondary beamline in the J-PARC Hadron Experimental Facility. After the extinction studies tried out several setups, the most extinction achievable setup was performed with $O(10^{10})$ statistics. This paper reports the extinction measurement and the current analysis status.
DOI: https://doi.org/10.22323/1.402.0104
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