THP057
ポスターセッション② 8月7日 61A 13:00-15:00
J-PARC MRにおける三次共鳴補正のためのTrim-Sアップグレードの設計
The design of Trim-S upgrade for third-order resonance correction at J-PARC MR
○Tan Yulian1, 下川 哲司1, 森田 裕一1, 安居 孝晃1, 吉井 正人1, 發知 英明1, 五十嵐 進1, 三浦 一喜1, 小野 礼人1, 佐川 隆2, 吉成 柾3（1高エネルギー加速器研究機構, 2ユニバーサルエンジニアリング, 3株式会社NAT）
○Tan Yulian1, Tetsushi Shimogawa1, Morita Yuichi1, Takaaki Yasui1, Masahito Yoshii1, Hideaki Hotchi1, Susumu Igarashi1, Kazuki Miura1, Ayato Ono1, Ryu Sagawa2, Masaki Yoshinari3（1KEK, 2Universal Engineering, 3NAT Corporation）
In the J-PARC Main Ring (MR), suppressing beam loss has become the top priority in achieving a 1.3 MW beam, as maintaining a hands-on maintenance environment is essential. One of the primary sources of beam loss is the random third-order resonances of 3νx = 64 and νx + 2νy = 64. We have successfully mitigated these beam losses using 4 Trim-S units, either the original 4 sets or 4 newly selected ones. However, beam loss persists due to the resonance influence on off-momentum particles (∆p/p = + 0.2% and -0.2%) and unaddressed fourth-order resonance 4νx = 85, which is combined by νx = 21 and 3νx = 64. Hence, a project involving 24 Trim-S units has been proposed. This paper presents the specifications and overall configuration of the Trim-S upgrade based on the parameters of Trim-S magnets and current settings, with consideration of the MR 1.3 MW power upgrade.