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RIS citation export for THDC1: Slow Extraction Operation at J-PARC Main Ring

AU  - Tomizawa, M.
AU  - Arakaki, Y.
AU  - Kimura, T.
AU  - Murasugi, S.
AU  - Muto, R.
AU  - Nishiguchi, H.
AU  - Noguchi, K.
AU  - Okamura, K.
AU  - Shirakabe, Y.
AU  - Sugiyama, Y.
AU  - Tamura, F.
AU  - Yanaoka, E.
AU  - Yoshii, M.
ED  - Gianfelice, Eliana
ED  - Nagaitsev, Sergei
ED  - Kim, Dong Eon
ED  - Marx, Michaela
ED  - Schaa, Volker R. W.
TI  - Slow Extraction Operation at J-PARC Main Ring
J2  - Proc. of HB2021, Batavia, IL, USA, 04-08 October 2021
CY  - Batavia, IL, USA
T2  - ICFA ABDW on High-Intensity and High-Brightness Hadron Beams
T3  - 64
LA  - english
AB  - A high-intensity proton beam accelerated in the J-PARC main ring (MR) is slowly extracted by using the third integer resonance and delivered to the experimental hall. A critical issue in slow extraction (SX) is a beam loss caused during the extraction. A dynamic bump scheme under an achromatic condition provides extremely high extraction efficiency. We have encountered a beam instability in the debunch formation process, which is estimated to be triggered by a longitudinal microstructure of the beam. To suppress this instability, the beam to the MR has been injected into the RF bucket with a phase offset. A newly developed RF manipulation, 2-step voltage debunch, has successfully pushed up the beam power up to 64.6 kW keeping a high extraction efficiency of 99.5%. A drastic beam loss reduction has been demonstrated in the beam test using a diffuser installed upstream of the first electrostatic septum (ESS1). 8 GeV bunched slow extraction tests for the neutrino-less muon to electron conversion search experiment (COMET Phase-I) have been successfully conducted.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 219
EP  - 224
KW  - extraction
KW  - operation
KW  - timing
KW  - experiment
KW  - septum
DA  - 2022/04
PY  - 2022
SN  - 2673-5571
SN  - 978-3-95450-225-7
DO  - doi:10.18429/JACoW-HB2021-THDC1
UR  - https://jacow.org/hb2021/papers/thdc1.pdf
ER  -