| Title |
The Reduction of the Leakage Field of the Injection Septum Magnet in Main Ring of J-PARC |
| Authors |
- T. Shibata, K. Ishii, H. Matsumoto, N. Matsumoto, T. Sugimoto
KEK, Ibaraki, Japan
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| Abstract |
A new injection septum magnet (InjSep) was installed in MR in 2016 for one of the upgrading of beam power of MR. We have measured the leakage field before installation, and it was found from the measurement results that the leakage field at the beam upstream region of the circulating duct was enough smaller than previous InjSep, however we tried to reduce the leakage field further by installation a new magnetic shield. First magnetic shield was produced in 2017, and we installed it in the InjSep. The leakage field was reduced, however the magnetic field of a quadrupole magnet at beam upstream of the InjSep was also reduced slightly. The decrease of the magnetic field of the one of main magnet was not permitted from the requirement of beam optics. In consequently, the first version was failed. The second one was produced in 2018, and we measured the leakage field was measured in Jan. 2019. The leakage field was reduced, while no reduction of the quadrupole magnet. We decided to use the second version for beam operation. The new additional shield was started to use in Nov. 2019.
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| Paper |
download THPOTK004.PDF [4.148 MB / 4 pages] |
| Cite |
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| Conference |
IPAC2022 |
| Series |
International Particle Accelerator Conference (13th) |
| Location |
Bangkok, Thailand |
| Date |
12-17 June 2022 |
| Publisher |
JACoW Publishing, Geneva, Switzerland |
| Editorial Board |
Frank Zimmermann (CERN, Meyrin, Switzerland); Hitoshi Tanaka (RIKEN, Hyogo, Japan); Porntip Sudmuang (SRLI, Nakhon, Thailand); Prapong Klysubun (SRLI, Nakhon, Thailand); Prapaiwan Sunwong (SRLI, Nakhon, Thailand); Thakonwat Chanwattana (SRLI, Nakhon, Thailand); Christine Petit-Jean-Genaz (CERN, Meyrin, Switzerland); Volker R.W. Schaa (GSI, Darmstadt, Germany) |
| Online ISBN |
978-3-95450-227-1 |
| Online ISSN |
2673-5490 |
| Received |
20 May 2022 |
| Revised |
11 June 2022 |
| Accepted |
11 June 2022 |
| Issue Date |
13 June 2022 |
| DOI |
doi:10.18429/JACoW-IPAC2022-THPOTK004 |
| Pages |
2774-2777 |
| Copyright |
 Published by JACoW Publishing under the terms of the Creative Commons Attribution 3.0 International license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI. |
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