1–6 Jun 2025
Taipei International Convention Center (TICC)
Asia/Taipei timezone

Challenges and solutions for high-intensity beam operations in the J-PARC Linac

TUAD1
3 Jun 2025, 09:30
20m
Hall 101 (TICC)

Hall 101

TICC

Contributed Oral Presentation MC4.A08 Linear Accelerators TUAD:Hadron Accelerators (Contributed)

Speaker

Yong Liu (High Energy Accelerator Research Organization)

Description

The Japan Proton Accelerator Research Complex (J-PARC) has achieved stable 1 MW operation test on its neutron target and is advancing toward higher power levels of 1.5 MW to support high-power MR operations and a second target station. This progression presents challenges, including increased intra-beam stripping (IBSt) of H⁻ ions, chop leakage from higher beam currents and emittance, low-energy beam loss due to halo formation, frontend fluctuations affecting beam transmission, and RF phase and amplitude fluctuations. To address these issues, a redesigned lattice mitigates IBSt, a new MEBT1 improves chopping and collimation, and machine learning-based compensation schemes manage frontend and RF fluctuations. Additionally, longitudinal and transverse matching schemes enhance beam quality, validated through benchmarked longitudinal measurements. Results from studies at 50 mA and 60 mA beam currents demonstrate significant progress in overcoming these challenges.

Region represented Asia
Paper preparation format LaTeX

Author

Yong Liu (High Energy Accelerator Research Organization)

Co-authors

Akihiko Miura (Japan Proton Accelerator Research Complex) Ersin Cicek (High Energy Accelerator Research Organization) Fumihiko Tamura (Japan Atomic Energy Agency) Fuminori Kobayashi (Ulvac (Japan)) Hideto Nakano (Japan Atomic Energy Agency) Hiroki Takahashi (Japan Atomic Energy Agency) Jun Tamura (Japan Atomic Energy Agency) K. Nanmo (High Energy Accelerator Research Organization) Katsuhiro Moriya (Japan Proton Accelerator Research Complex) Katsuhiro Shinto (Japan Atomic Energy Agency) Kenta Futatsukawa (High Energy Accelerator Research Organization) Kiyonori Ohkoshi (Japan Proton Accelerator Research Complex) Kota Okabe (Japan Proton Accelerator Research Complex) Masashi Otani (High Energy Accelerator Research Organization) Pranab Saha (Japan Proton Accelerator Research Complex) Ryo Kitamura (Japan Proton Accelerator Research Complex) Satoshi Mizobata (High Energy Accelerator Research Organization) Shinichi Shinozaki (Japan Atomic Energy Agency) Takanori Shibata (Japan Proton Accelerator Research Complex) Takashi Itou (Japan Atomic Energy Agency) Takatoshi Morishita (Japan Atomic Energy Agency) Tomoaki Miyao (High Energy Accelerator Research Organization) Yasuhiro Fuwa (Japan Atomic Energy Agency) Yasuhiro Kondo (Japan Atomic Energy Agency) Yuga Nakazawa (High Energy Accelerator Research Organization) Yuji Fukui (High Energy Accelerator Research Organization) Zhigao Fang (High Energy Accelerator Research Organization)

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