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Description
Boron Neutron Capture Therapy (BNCT) is an advanced radiotherapy technology that uses the specific reaction between boron atoms and thermal neutrons to selectively kill tumor cells, featuring strong targeting and low damage to normal tissues. This paper details the design and commissioning work of the low energy beam transport (LEBT) and high energy beam transport (HEBT) sections of BNCT02, the second BNCT accelerator developed by the Institute of High Energy Physics, Chinese Academy of Sciences. The beamline is used to stably transmit the proton beam from the ion source to the neutron production target, with the beam power on the target reaching 40kW. During the design phase, structural parameters of LEBT and HEBT were optimized through systematic beam dynamics simulations, focusing on solving key issues such as beam envelope control, inter-stage matching, emittance growth, and beam loss suppression. During the commissioning phase, relevant tests and adjustments were performed on beamline components and beam parameters, including beam position calibration, focusing strength optimization, and transmission efficiency verification. The commissioning results show that the transmission efficiency of the LEBT section is close to 80%; within the CT error range, the beam transmission efficiency of the HEBT section reaches 100% with almost no beam loss. In addition, the beam spot size on the target (close to 150×160mm) and density distribution also meet the physical design requirements. The beamline design has good stability and reliability, providing solid technical support for the stable operation of the BNCT02 accelerator and the subsequent clinical application of BNCT.