STUDY OF APF-IH LINEAR ACCELERATOR FOR MEDICAL RI PRODUCTION

离子线性加速器（linac）由于低电力效率（低分流阻抗）而未用于医疗和工业应用。但在低能区（<10 MeV/u），叉指H型直线加速器的并联阻抗是其它直线加速器的5-20倍。交替相位聚焦（APF）结构同时实现了束流的加速和聚焦，有利于加速腔的小型化。我们研制了APF-IH直线加速器的原理验证系统，并在50 W的射频功率条件下成功地将质子从11 keV加速到90 keV。在设计过程中，进行了束流轨迹模拟和模型腔实验。因此，它在东京工业大学核反应堆研究实验室加速质子束作为初步测试。我们将在罗马尼亚物理与核工程研究所进行医用放射性核素生产的氘和氚加速试验。通过使用该研究项目的结果，可以开发包括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进行调查; Petru-Major大学，Sapienta大学和塔尔古-穆雷斯医学和药理学大学。除了合作大学的财政支持外，我们还考虑向日本外务省和日本国际协力事业团（JAICA/JOCV）申请日本ODA（官方发展援助）。我们请求罗马尼亚教育和研究部长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.