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RIS citation export for WEPTS024: Tune Shifts and Optics Modulations in the High Intensity Operation at J-PARC MR

AU  - Yasui, T.Y.
AU  - Igarashi, S.
AU  - Koseki, T.
AU  - Ohmi, K.
AU  - Sato, Y.
AU  - Satou, K.
ED  - Boland, Mark
ED  - Tanaka, Hitoshi
ED  - Button, David
ED  - Dowd, Rohan
ED  - Schaa, Volker RW
ED  - Tan, Eugene
TI  - Tune Shifts and Optics Modulations in the High Intensity Operation at J-PARC MR
J2  - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019
CY  - Melbourne, Australia
T2  - International Particle Accelerator Conference
T3  - 10
LA  - english
AB  - J-PARC Main Ring (MR) is the intensity-frontier proton accelerator. The beam intensity of 2.6×10¹⁴ protons per pulse has been achieved for the current user operation. In this high-intensity operation, the tune spread caused by the space-charge is one of the main reasons for beam loss. The modulation of the betatron function and the tune shift were simulated with a PIC algorithm calculation code*. The simulation results showed that the space-charge effects were dominant in small particle action, and the sextupole fields effects were dominant in large particle action. Because sextupole strength is large in MR, sextupole fields induce substantial tune shifts. At the benchmark of the space-charge simulation, the simulation results matched the analytical space-charge calculations performed without sextupoles. It was found that the betatron function was modulated at most 6% by the space-charge effects and at most 8% by the effects of sextupoles in J-PARC MR. These effects to the injection beam optics matching and to the beam aperture will be investigated.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 3148
EP  - 3151
KW  - space-charge
KW  - simulation
KW  - betatron
KW  - sextupole
KW  - quadrupole
DA  - 2019/06
PY  - 2019
SN  - 978-3-95450-208-0
DO  - DOI: 10.18429/JACoW-IPAC2019-WEPTS024
UR  - http://jacow.org/ipac2019/papers/wepts024.pdf
ER  -