The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
TY - CONF
AU - Yasui, T.Y.
AU - Igarashi, S.
AU - Koseki, T.
AU - Kurimoto, Y.
AU - Morita, Y.
AU - Ohmi, K.
AU - Sato, Y.
AU - Shimogawa, T.
ED - Liu, Lin
ED - Byrd, John M.
ED - Neuenschwander, Regis T.
ED - Picoreti, Renan
ED - Schaa, Volker R. W.
TI - Compensations of Third-Order Resonances in J-PARC MR
J2 - Proc. of IPAC2021, Campinas, SP, Brazil, 24-28 May 2021
CY - Campinas, SP, Brazil
T2 - International Particle Accelerator Conference
T3 - 12
LA - english
AB - The main ring synchrotron (MR) of the Japan Proton Accelerator Research Complex (J-PARC) provides high-power proton beams for the neutrino and hadron experiments. In the fast extraction (FX) operation, the beams are injected with the energy of 3 GeV and the intensity of 3.3 × 10¹³ protons per bunch, and accelerated to 30 GeV. Most of the beam losses are observed in the low-energy period, because the space charge tune spread is large, and crosses various kinds of resonances. In this study, the compensations of the third-order resonances are performed. The present operation tune is (ν_{x}, ν_{y}) = (21.35, 21.43) in FX operation. The nearest third-order structure resonance is ν_{x}-2ν_{y}=-21. It was clearly compensated by optimizing the phase advances in the arc sections. The compensation was confirmed by the aperture survey simulations and demonstrated by the three different experiments. The third-order nonstructure resonances near the operation tune are 3ν_{x}=64 and ν_{x}+2ν_{y}=64. They are simultaneously compensated by introducing four trim coils of the sextupole magnets. The beam loss was successfully reduced by adopting the compensations.
PB - JACoW Publishing
CP - Geneva, Switzerland
SP - 744
EP - 747
KW - resonance
KW - sextupole
KW - operation
KW - optics
KW - survey
DA - 2021/08
PY - 2021
SN - 2673-5490
SN - 978-3-95450-214-1
DO - doi:10.18429/JACoW-IPAC2021-MOPAB229
UR - https://jacow.org/ipac2021/papers/mopab229.pdf
ER -