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

Beyond 1 MW Operation of the J-PARC RCS with Minimum Beam Loss

THPT10

Oct 23, 2025, 3:30 PM

2h

third floor (conference center)

Poster Presentation WGA:Beam Dynamics in Rings THPT poster session

Speaker

Pranab Saha (Japan Proton Accelerator Research Complex)

Description

In the 3-GeV RCS of J-PARC, we have already achieved user operation at the designed 1 MW beam power. The beam loss and the corresponding machine activation have been sufficiently minimized to obtain a stable operation. To cope with user demands, the beam power of the RCS has to be increased far beyond the designed 1 MW. For that purpose, we have performed numerical simulation and beam studies for 1.5 MW beam power by increasing both peak current and injection pulse length of the linac beam injected into the RCS. We have demonstrated an extremely low beam loss rate of ~1E-4 corresponding to a loss power of even less than 0.1 kW against the collimator capacity of 4 kW. The beam loss occurs only at the injection energy localizing well at the collimator section. Recent beam test and simulation results at 1.5 MW beam power are presented.