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

Overview of seven-unit collimator system and its operation for J-PARC main ring

TUPB031
3 Jun 2025, 16:00
2h
Exhibiton Hall A _Bear (TWTC)

Exhibiton Hall A _Bear

TWTC

Poster Presentation MC4.T19 Collimation Tuesday Poster Session

Speaker

Masashi Shirakata (High Energy Accelerator Research Organization)

Description

The J-PARC main ring has three linear sections, and one have a beam collimator system downstream of the injection devices to localise beam losses. In September 2024, the seventh collimator unit was installed, completing an upgrade of the collimator system that has been underway since 2012. The system was changed from one that scatters and captures the beam halo to one that draws the jaw close to the beam core and directly removes its halo. This allowed a number of collimator units to be placed in a limited area. The original beam loss capacity in the collimator area was 450 W. Seven collimator units allow a beam loss of 3.5 kW. Currently, six collimator units are used to deliver 800 kW beams to neutrino experiments with losses of less than 500 W. By using seven collimator units, a beam of 1.3 MW can be delivered with a reasonable loss amount. The combination of units effectively removes the halo component of the beam and localises the beam losses. However, the direct removal method can create loss spots downstream of the collimator according to phase advance. This paper describes the operation of collimators in actual beam operation.

Region represented Asia
Paper preparation format Word

Author

Masashi Shirakata (High Energy Accelerator Research Organization)

Co-authors

Yoichi Sato (Japan Proton Accelerator Research Complex) Takaaki Yasui (High Energy Accelerator Research Organization) Junpei Takano (Japan Proton Accelerator Research Complex) Kotomi Kadowaki (High Energy Accelerator Research Organization) Masaaki Nishikawa (Nippon Advanced Technology Co., Ltd.)

Presentation materials

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