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

Beam Bunch Spacing Extension for Neutron Time-of-Flight Measurements at the LEAF

THPT04

Oct 23, 2025, 3:30 PM

2h

third floor (conference center)

Poster Presentation WGB:Beam Dynamics in Linacs THPT poster session

Speaker

Yu Tang (Institute of Modern Physics, Chinese Academy of Sciences)

Description

Longer bunch spacing is essential for precise product detection in certain nuclear physics experiments. At LEAF, a 10.156 MHz pre-buncher has been successfully commissioned, producing a 98.4 ns main-bunch spacing with a measured FWHM of 1.7 ns using a fast Faraday cup. Residual satellite bunches at the 12.3 ns linac micro-pulse period necessitate a dedicated RF deflector to remove unwanted time components. Simulation results demonstrate that the designed RF deflector achieves nearly 100 % chopping efficiency while maintaining a 1.91 ns FWHM and 0.57 % energy spread, delivering a clean 100 ns beam structure. This enables suppression of pile-up and spectral overlap, thereby improving the time-of-flight resolution at LEAF.