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| MOPG43 |
Beam Tuning for Longitudinal Profile at J-PARC Linac |
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- A. Miura
JAEA/J-PARC, Tokai-mura, Japan
- Y. Liu, T. Maruta
KEK/JAEA, Ibaraki-Ken, Japan
- T. Miyao
KEK, Ibaraki, Japan
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Using bunch shape monitors (BSMs), we measured the longitudinal bunch lengths of negative hydrogen ion beams in the J-PARC linac. A BSM was installed between two linacs, separate-type drift tube linac (SDTL) and an annular-ring-coupled structure linac (ACS), having acceleration frequencies of 324 and 972 MHz, respectively. We used radio-frequency amplitude modulation of bunches in the beam transport between the SDTL and ACS to minimize emittance growth and beam loss. We conducted amplitude scanning and compared the results with the twiss-parameters obtained from the transverse profiles. In this paper, we discuss the results of amplitude tuning of the buncher cavity at the point of beam loss and emittance. We also discuss the measurement results for various equipartitioning settings of quadrupole magnets.
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| DOI • |
reference for this paper
※ DOI:10.18429/JACoW-IBIC2016-MOPG43
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