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Description
Dong Guan Boron Neutron Capture Therapy (D-BNCT) device uses a proton beam with an energy of 2.8 MeV to produce thermal neutrons. The peak power of the beam is 56 kilowatts. The entire system includes a proton linear accelerator, a rotating lithium target, and two treatment rooms. In pursuit of device stability, a highly stable ECR ion source was developed to serve as the proton injector for the linear accelerator, and a continuous wave RFQ accelerator with an RF frequency of 180 MHz, peak current of 25 mA, RF power of 110 kW, and an energy of 2.8 MeV was developed. During the commissioning phase of the accelerator, The ECR ion source extracted a proton beam of 26mA at 200Hz, with a pulse duration of 4 milliseconds, and the beam remained stable for 48 hours. The RFQ cavity power was conditioned to 130kW@200Hz, 4.2ms. After a week of conditioning, the daily VSWR protection occurrences were reduced to single digits. During the beam commissioning between the accelerator and the treatment end, the beam transmission efficiency of the RFQ is 95.6%@peak current of 20mA, meeting the condition of achieving a beam power of 56 kilowatts. At present the D-BNCT facility has now been put into clinical operation, demonstrating remarkable therapeutic outcomes.