Countermeasures for the failure of the new septum magnet for fast extraction in J-PARC Main Ring
- 1. High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki (Japan)
Description
From July 2021, upgrade works of the septum magnets for fast extraction (FX) commenced with an aim of increasing the beam power of MR to 1.3 MW from 500 kW. However, we found defects that are water leakage and brazing failure in the magnetic coil of the septum (SM32) in August 2021. We decided to postpone its installation and produce new magnet coils for SM32. Full restoration of SM32 is expected in the summer of 2023. The beam extraction in June 2022 was performed using a temporary vacuum duct instead of the SM32 magnet, and the extraction beam orbit was maintained by increasing the magnetic field of the other five septum magnets. In this presentation, we will report on the study of the beam extraction method without SM32 during the period until recovery, and the result of the beam test in June 2022. (author)
Availability note (English)
Available from https://www.pasj.jp/web_publish/pasj2022/proceedings/PDF/FROA/FROA05.pdfAbstract (Japanese)
J-PARCではビームパワーの高出力化が進められている。ニュートリノビーム(NU)ラインまたはAbortラインへの速い取り出し(FX)機器についても、2021年7月から2022年5月にかけて低磁場セプタム電磁石(SM)と高磁場SMの交換を実施した。しかし2021年夏、高磁場SMのうち、NUライン向けのSM32Eのコイルに漏水とロウ付け不良が発見されたため、SM32のインストールを延期した。コイルは再製作を必要とし、SM32の完全復旧は2023年夏の見込みである。本講演ではコイル故障の詳細、SM32復旧計画について紹介し、復旧までの期間中SM32を使用しないビーム取り出し方法の検討、及び2022年6月のビーム試験の結果について報告する。SADを用いたビーム取り出し方法の検討ではSM32無しでエミッタンス15π mm mradの30GeV陽子ビームを取り出す場合、電源への負担軽減も重要な課題であることがわかった。その対応についても報告する。(著者)Additional details
Additional titles
- Original title (Japanese)
- J-PARC MR速い取り出し用新セプタム電磁石の故障への対応
Identifiers
Publishing Information
- Imprint Title
- Proceedings of the 19th annual meeting of Particle Accelerator Society of Japan
- Imprint Pagination
- [1163 p.]
- Journal Page Range
- p. 170-174
Conference
- Title
- 19. annual meeting of Particle Accelerator Society of Japan. Online-held
- Acronym
- PASJ2022
- Dates
- 18-21 Oct 2022
- Place
- Japan (Japan)
INIS
- Country of Publication
- Japan
- Country of Input or Organization
- Japan
- INIS RN
- 54063412
- Subject category
- S43: PARTICLE ACCELERATORS;
- Resource subtype / Literary indicator
- Conference, Non-conventional Literature
- Descriptors DEI
- BACKGROUND RADIATION; BEAM EXTRACTION; BEAM OPTICS; DOSE RATES; DOSEMETERS; EDDY CURRENTS; J-PARC SYNCHROTRONS; KICKER MAGNETS; MAGNET COILS; MAGNETIC FIELDS; RADIATION MONITORING; SEPTUM MAGNETS
- Descriptors DEC
- ACCELERATORS; CURRENTS; CYCLIC ACCELERATORS; ELECTRIC COILS; ELECTRIC CURRENTS; ELECTRICAL EQUIPMENT; EQUIPMENT; MAGNETS; MEASURING INSTRUMENTS; MONITORING; RADIATIONS; SYNCHROTRONS
Optional Information
- Notes
- 9 refs., 9 figs., 2 tabs. Imprint:This symposium was held online