Speaker
Description
Charge-exchange injection using H⁻ beam enables high-intensity proton accumulation in rapid cycling synchrotrons and storage rings. As a result, high-power H⁻ linacs are indispensable for modern pulsed neutron sources and high-energy physics facilities.
Compared with proton linacs, H⁻ linacs are intrinsically susceptible to loss induced by electron stripping. Intra-beam stripping (IBSt) is a fundamental, intensity-dependent mechanism that can dominate residual activation and is governed by phase-space distribution and focusing lattice. In addition, H$^0$ generated by stripping produce broad loss patterns sensitive to aperture constraints.
At the J-PARC linac, these mechanisms were investigated through experiments, simulations, and long-term operation. Their dependencies on lattice and apertures were quantitatively characterized, with good agreement between simulations, monitors, and radiation measurements.
Based on this understanding, a systematic mitigation strategy was established. Radiation hot spots were eliminated, and total activation was reduced by more than a factor of two, enabling stable high-power operation and providing guidance for future high-intensity H⁻ linacs.
| I have read and accept the Privacy Policy Statement | Yes |
|---|