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RIS citation export for TUVIR15: Long-Term Beam Position and Angle Stabilities for the J-Parc Main Ring Slow Extraction

AU  - Tomizawa, M.
AU  - Arakaki, Y.
AU  - Kimura, T.
AU  - Komatsu, Y.
AU  - Murasugi, S.
AU  - Muto, R.
AU  - Okamura, K.
AU  - Shirakabe, Y.
AU  - Yanaoka, E.
ED  - Schaa, Volker RW
TI  - Long-Term Beam Position and Angle Stabilities for the  J-Parc Main Ring Slow Extraction
J2  - Proc. of IPAC2020, Caen, France, 10-15 May 2020
CY  - Caen, France
T2  - International Particle Accelerator Conference
T3  - 11
LA  - english
AB  - A 30 GeV proton beam accelerated in the J-PARC Main Ring (MR) is slowly extracted by the third integer resonant extraction and delivered to the hadron experimental hall. One of the critical issues in slow extraction of a high intensity proton beam is an inevitable beam loss caused by the extraction process at septum devices. A unique dynamic bump scheme for the slow extraction has been applied to reduce the beam loss. We have achieved 51 kW stable operation at 5.2s cycle in the recent physics run. The extraction efficiency is very high, typically 99.5%. However, the dynamic bump scheme is sensitive to the beam orbit angle at the first electrostatic septum (ESS1). The orbit angle of the dynamic bump must be sometimes readjusted to keep such a high efficiency. In future, diffusers and/or a silicon bend crystal, which are more sensitive to the orbit angle fluctuation, would be introduced to achieve a further high slow extraction efficiency. A long-term stability of the beam position and angle at the ESS1 has been investigated. We observed the fluctuations synchronized with tides and estimated to be due to tunnel expansion.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 31
EP  - 34
KW  - extraction
KW  - proton
KW  - septum
KW  - experiment
KW  - operation
DA  - 2020/10
PY  - 2020
SN  - 2673-5490
SN  - 978-3-95450-213-4
DO  - doi:10.18429/JACoW-IPAC2020-TUVIR15
UR  - http://jacow.org/ipac2020/papers/tuvir15.pdf
ER  -