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，系统庞大而复杂。我们尝试了21世纪癌症治疗加速系统的新加速技术。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。研究开发了一种用于气体和固体靶的激光离子源。我们将低温冷却器与YAG激光器相结合，获得了高强度离子的产物。研究结果分别在国际会议和国际期刊上发表。采用直接等离子体注入方案，对设计用于将电荷质量比（q/A）为1-1/3的离子从40 keV/amu加速到2 MeV/amu的APF Interdigital-H （IH）直线加速器进行了实验。从粒子轨迹计算结果来看，为了实现较大的接受度，改进是必要的。为了降低改进成本，对直线加速腔进行了尽可能小的改造。在低能量注入加速试验中，采用激光离子源直接等离子体注入方案的APF-IH直线加速器不能获得较大的接受度。为此，设计了一种新的混合单腔直线加速器。在单腔内安装了低能区聚焦性能良好的射频四极杆（RFQ）和中能区加速性能良好的漂移管（漂移管）。混合单腔直线加速器的设计研究分别在国际会议和国际期刊上发表。

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.