STUDY OF APF-IH LINEAR ACCELERATOR FOR MEDICAL RI PRODUCTION

离子直线加速器(直线加速器)由于电效率低(分流阻抗低)而没有在医疗和工业上应用。而叉指H(IH)型直线加速器在低能区(~lt；10 MeV/u)具有较高的分流阻抗，是其他加速器的5-20倍。交替相位聚焦(APF)结构可以同时实现光束加速和光束聚焦，有利于加速腔的小型化。我们研制了一台APF-IH直线加速器的原理证明(POP)系统，在50W的射频功率条件下，成功地将质子从11keV加速到90keV。我们计划将一台普通的IH直线加速器改进为用于医用无线电同位素(RI)生产的APF-IH。在设计中，仔细地进行了束流轨迹模拟和模型腔试验。因此，它加速了质子束，作为东京工业大学核反应堆研究实验室的初步试验。我们将在罗马尼亚的物理和核工程研究所进行用于医用放射性核素生产的氚和特里顿加速试验。利用该研究项目的成果，有可能开发出包括X射线、CT和PET在内的紧凑型癌症诊断系统。我们计划与罗马尼亚的大学、Petru主要大学、Sapienta大学和Targu-Mures医学和药理大学一起进行调查。除了合作大学的资金支持外，我们认为可以申请日本外务省和日本国际协力事业团(JAICA/JOCV)的官方发展援助(ODA)。我们向罗马尼亚教育和研究部长请愿，要求将我们的项目作为罗马尼亚政府的首要任务。

An ion linear accelerator (linac) has not been used for medical and industry application because low electric power efficiency (low shunt impedance). But an Interdigital-H (IH) type linac has high shunt impedance of 5-20 times as compared with other in low beam energy region (<10 MeV/u). The Alternating Phase focus (APF) structure to realize beam acceleration and beam focusing simultaneously is useful for downsizing of the accelerating cavity. We developed the POP (Proof of Principle) system of an APF-IH linac and succeeded to accelerate proton from 11 keV to 90 keV under the conditions of RF power of 50 W.We planned to improve an ordinary IH linac to the APF-IH type for Medical Radio Isotope (RI) production. In the design, beam trajectory simulation and model cavity test were carried out carefully. Consequently, it accelerated proton beam as preliminary test at Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology. We will carry out the deuteron and triton acceleration test for medical RI production at Institute for Phisics and Nuclear Engineering in Romania.By using the results of this research project, it is possible to develop a compact cancer diagnosis system including X-ray CT and PET. We plan to investigate it with universities in Romania ; Petru-Major University, Sapienta University and Medical and Pharmacology University of Targu-Mures. Besides the financial supports of collaborating universities, we think to apply for Japanese ODA (Official Development Assistance) by the Ministry of Foreign Affairs of Japan and Japan International Cooperation Agency (JAICA/JOCV). We petitioned the Minister of Education and Research of Romaniato apply our project as a top priority of Romanian government.