内离子源小型回旋加速器的调试

Commissioning of Compact Cyclotron with Internal Ion Source

摘要: 2007年底，中国工程物理研究院流体物理研究所开始研制内离子源小型回旋加速器，以服务于PET同位素生产制备。该加速器加速负氢离子，引出质子，设计能量为11 MeV、平均流强为50 μA。本文介绍该加速器的磁铁、高频腔、离子源的调试和整机的调试。调试结果表明，等时性磁场的积分相移为±9°，高频腔的Q值达到理论Q值的60%，半径60 mm处负氢离子流强可达到100～160 μA，整机引出的质子束流达到了11 MeV和50 μA的设计指标。用调试后的整机进行¹⁸F同位素生产，¹⁸F产量达65.49 GBq(1.77 Ci)。

Abstract: Since 2007, a compact cyclotron with internal ion source has been developed in Institute of Fluid Physics, China Academy of Engineering Physics for the production of short lived PET isotopes. The designed energy of the cyclotron’s extracted proton beam is 11 MeV, and the designed current is 50 μA. In this work, the commissioning of the magnet, the RF cavity, the ion source and the full machine were presented. The integral phase shift of the magnetic field is ±9°. The measured Q value is about 60% of the theoretical value. The intensity of the H^- ion beam after one turn of acceleration in the central region is 100-160 μA. The designed parameters of extracted proton beam are achieved. Using the extracted proton beam to produce ¹⁸F, a yield of 6.49 GBq (1.77 Ci) is achieved.