JACoW logo

Joint Accelerator Conferences Website

The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.


RIS citation export for MOPAB229: Compensations of Third-Order Resonances in J-PARC MR

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  -