Paper |
Title |
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THOAA03 |
Transverse Intra-bunch Feedback in the J-PARC MR |
2786 |
SUSPSNE086 |
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- K. Nakamura
Kyoto University, Kyoto, Japan
- Y.H. Chin, T. Obina, M. Okada, M. Tobiyama
KEK, Ibaraki, Japan
- T. Koseki, T. Toyama
J-PARC, KEK & JAEA, Ibaraki-ken, Japan
- Y. Shobuda
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
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We will report the development of a new broadband (bandwidth of around 100MHz) feedback system for suppression of intra-bunch oscillations and reduction of particle losses at the J-PARC Main Ring (MR). A new BPM has been designed based on the exponential coupler stripline type (the diameter of 134 mm and the length of 300 mm) and it is now under fabrication. In this BPM system, the frequency characteristics are corrected using the equalizer as bunch signals are differentiated. The design detail and the performance of the new BPM as well as preparation of newly installed exciter and power amplifiers will be presented. We will also report beam test results of head-tail mode suppression at 3 GeV with the bunch length of 150-250 ns.
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Slides THOAA03 [1.149 MB]
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2014-THOAA03
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THPME061 |
Present Status of J-PARC - after the Shutdown due to the Radioactive Material Leak Accident- |
3373 |
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- T. Koseki
KEK, Ibaraki, Japan
- K. Hasegawa
JAEA/J-PARC, Tokai-mura, Japan
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In J-PARC, a radioactive material leak accident occurred at the Hadron Experimental Facility on May 23, 2013. The accident was triggered by a malfunction of the slow extraction system of the Main Ring synchrotron. After seven-month long shutdown due to the accident, beam operation of the linac was restarted in December 2013. In this paper, the most recent status of the beam operation is presented.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2014-THPME061
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Export • |
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※ LaTeX,
※ Text/Word,
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