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

Scenario of beam-based alignment with new BPM system for future beam commissioning of 1.3-MW operation at the J-PARC Main Ring

THFA07

Oct 23, 2025, 2:55 PM

5m

Room A (Conference Center)

Flash Poster Presentation WGD:Operations and Commissioning THFA WGs flash talks

Speaker

Yoshihiro Saito (The Graduate University for Advanced Studies, SOKENDAI)

Description

At the J-PARC Main Ring, a project is in progress to upgrade the beam power to 1.3 MW for the neutrino oscillation experiment. Control of the optics and beam orbit relative to the magnetic center of the accelerator components is crucial to suppress beam losses in intense beams. We need to reduce the determination error of the beta function from the current value of 2% to less than 1%. Furthermore, the closed-orbit offset from the magnetic center must be set within 10μm to weaken the effect of the resonances, while its precision is 30μm up to now. To satisfy such targets, ongoing upgrades of the data acquisition system for the BPMs will improve the accuracy to one-third than the current value. As a first step to requested fine measurements of optics parameters, we calculated how small an offset with respect to the magnetic center we can obtain via beam-based alignment with the new BPM circuits by simulation. We discussed the upgrade of the method for beam-based alignment to satisfy the requirements of the orbit correction to reduce the effect of the resonance in our system.