THO1LR02
J-PARC, KEK & JAEA, Ibaraki-ken, Japan
JAEA/J-PARC, Tokai-mura, Japan
KEK, Ibaraki, Japan
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THO1LR02 |
Recent Commissioning of High-Intensity Proton Beams in J-PARC Main Ring | |
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| In the J-PARC, the main ring (MR) provides high power proton beams of 240 kW (1.24·1014 protons per pulse) to the neutrino experiment. The linac energy was upgraded from 181 MeV to 400 MeV in 2013, and its current is going to be from 30 mA to 50 mA in 2014. If the beam losses are minimized and localized in the MR, the MR will have the capability to provide over 300 kW after the upstream upgrades. Based on the upgrades and improvements of the 3-50BT and the MR in 2013 and 2014, following approaches have been tested and commissioned: 2nd harmonic RFs under the faster rise-up time improvement of the injection kickers, to increase bunching factor; intra-bunch feed-back system and chromaticity patterned correction, to suppress instability; intra-bunch feed-back, tail and reflection improvement of the injection kickers, and 6D matching between the 3-50BT and the MR, to reduce injection losses; achromatic tuning at the collimator section of the 3-50BT to cut beam halo effectively; collimator upgrades, aperture enlargement at dispersion peaks, and momentum spread control, to localize beam losses in the collimator section; new operation point survey. | ||
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Slides THO1LR02 [2.553 MB] | |