HB2025 - the 71st ICFA Advanced Beam Dynamics workshop on High-Intensity and High-Brightness Hadron Beams

The experimental evaluation of third-order resonance correction using 8 Trim-S in J-PARC MR

THPT61

Oct 23, 2025, 3:30 PM

2h

third floor (conference center)

Poster Presentation WGD:Operations and Commissioning THPT poster session

Speaker

Yulian Tan (High Energy Accelerator Research Organization)

Description

In the J-PARC Main Ring (MR), an upgrade project involving a total of 24 Trim-S units is in progress to further suppress beam loss caused by off-momentum particles. This effort targets key resonances, including the third-order resonance 3νx=64 and νx+2νy=64, and a fourth-order resonance 4νx=85, which are produced by the combination of vx=21 and 3vx=64. Four additional Trim-S units have been installed in the D3 power supply building, supplementing the original four units located in the D2 power supply building, resulting in a total of eight operational Trim-S units in J-PARC MR. To evaluate the feasibility of the full 24-unit upgrade, step-by-step experimental studies were carried out using first the individual sets of four Trim-S units in D2 and D3, and subsequently all eight units combined, for resonance correction. This paper reports the experimental procedures, analyzes the results, and outlines the plans for the next step based on the experimental findings.