STUDY OF VERY SMALL INJECTOR LINEAR ACCELERATOR WITH DIRECT PLASMA INJECTION SCHEME FOR HEAVYION CANCER THERAPY

利用20世纪的加速器技术构建了粒子癌症治疗的加速器系统。因此，这个系统是庞大和复杂的。我们尝试了21世纪的新加速器技术，用于癌症治疗的加速器系统。这些新技术包括直接等离子体注入方案(DPIS)、漂移管加速结构的交变相位聚焦(APF)方法和加速腔的三维分析。我们将低温制冷器与激光相结合，成功地产生了高强度离子。研究成果分别发表在国际会议和国际期刊上。我们在APF交指H(IH)直线加速器上进行了直接等离子体注入实验，该加速器设计用于加速电荷质量比(Q/A)为1-1/3的离子，从40keV/amu加速到2 MeV/amu。从粒子轨迹计算的结果可以看出，为了实现大范围的接受，有必要对其进行改进。为了降低改进成本，对直线加速器腔进行了尽可能小的改型。在低能量注入的加速试验中，APF-IH直线加速器在激光离子源直接等离子体注入方案中不能得到很大的认可。因此，提出了混合式单腔直线加速器的新概念。在单个腔体中安装了在低能区具有良好聚焦性能的射频四极(RFQ)型和在中能区具有良好加速性能的漂移管型。混合式单腔直线加速器的设计研究分别发表在国际会议和国际期刊上。

An accelerator system of particle cancer therapy was constructed by the accelerator technology of the 20th century. Therefore, the system is large and complex. We tried new accelerator technology of the 21st century for accelerator system of cancer therapy. These new technologies are Direct Plasma Injection Scheme (DPIS), Alternating Phase Focusing (APF) method of drift tube acceleration structure and 3-dimensional analysis of acceleration cavity.A laser ion source was studied and developed for gas and solid target. We-succeeded product of high intensity ion by combining a cryogenic-cooler and a YAG laser. The results were contributed and published in international conference and international journal, respectively. We carried out the experiment with Direct Plasma Injection Scheme for APF Interdigital-H (IH) linear accelerator which was designed to accelerate ions with charge to mass ratio (q/A) of 1-1/3 from 40 keV/amu to 2 MeV/amu. We found that the improvement was necessary to realize large acceptance from the result of particle trajectory calculation. In order to decrease the cost of improvement, the liner accelerator cavity was modified as small as possible. In acceleration test in low energy injection, the APF-IH linear accelerator could not to get large acceptance by Direct Plasma Injection Scheme with laser ion source. Therefore, a hybrid single cavity linear accelerator was designed as new conception. A Radio Frequency Quadrupole (RFQ) type having good focusing performance in low energy region and a drift tube type having good acceleration performance in medium energy region were installed in a single cavity. Design study of the hybrid single cavity linear accelerator was contributed and published for International conference and International Journal, respectively.