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TY - CONF
AU - Nishiguchi, H.
AU - Fujii, Y.
AU - Fukao, Y.
AU - Hashimoto, Y.
AU - Igarashi, Y.
AU - Mihara, S.
AU - Moritsu, M.
AU - Muto, R.
AU - Sarin, P.
AU - Tamura, F.
AU - Tomizawa, M.
AU - Ueno, K.
ED - Boland, Mark
ED - Tanaka, Hitoshi
ED - Button, David
ED - Dowd, Rohan
ED - Schaa, Volker RW
ED - Tan, Eugene
TI - Extinction Measurement of J-PARC MR with 8 GeV Proton Beam for the New Muon-to-Electron Conversion Search Experiment - COMET
J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY - Melbourne, Australia
T2 - International Particle Accelerator Conference
T3 - 10
LA - english
AB - At J-PARC, extraction tests of a 8GeV pulsed proton beam from Main Ring (MR) have been successfully completed by a team drawn from the Accelerator Laboratory Group and the COherent Muon to Electron Transition (COMET) Experimental Group. The COMET Experiment aims to find new physics beyond the Standard Model by searching for the coherent neutrinoless conversion of a muon to an electron in muonic atoms, so-called mu-e conversion. This requires an extremely clean pulsed beam, and development of this beam plays a key role in the pursuit of the highest level of sensitivity. This successful extraction test is the clearing of a major milestone for the forthcoming experiment. The goal of the extraction tests was to confirm the beam quality under the customized MR operation mode. The J-PARC MR usually accelerates the proton beam (at one bunch per 600ns) up to 30GeV. But in the test, the MR instead accelerates the proton beam (at one bunch per 1.2us) up to 8GeV. The number of protons leaking between proton bunches, so-called EXTINCTION, must be less than one for every 10¹⁰ protons in the bunch. Extraction tests in the customized mode were conducted in January and February 2018 and resulted in many successes. In this test, leakage protons between bunches was successfully reduced below the objective of 10^{−10} of the number of protons in a bunch. This is a great success to guarantee the quality of proton beam required by COMET experiment. In addition, the time development of proton leakage was also precisely studied with several RF settings which enables us to further improve the extinction. In this paper, the result of extinction measurement and future prospect of beam extinction improvement is presented in addition to the detailed description of customized MR operation.
PB - JACoW Publishing
CP - Geneva, Switzerland
SP - 4372
EP - 4375
KW - proton
KW - experiment
KW - extraction
KW - timing
KW - kicker
DA - 2019/06
PY - 2019
SN - 978-3-95450-208-0
DO - DOI: 10.18429/JACoW-IPAC2019-FRXXPLS2
UR - http://jacow.org/ipac2019/papers/frxxpls2.pdf
ER -