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Design and development of a prototype of superconducting compact cyclotron

超导紧凑型回旋加速器样机的设计与研制

基本信息

批准号：
03558024
负责人：
MATOBA Masaru
金额：
$ 5.44万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

项目摘要

The present work has been performed in 1991 and 1992. A prototype of superconducting cyclotron had been kept in custody at the chemical research institute, Kyoto University. The cyclotron has a pole of 15.5 c m in radius for 10 MeV protons and the yoke of about 4 ton. In 1991 we have carried out a transportation and an installation of the prototype, and established a research structure a Kyushu University. Calculations have been carried out t o design the optimum magnetic field and to examine the beam properties in equilibrium and accelerated orbits. The field shape has been determined through least-square analyses for an optimum condition for isocronous and focusing. These results were published in a symposium in 1991. A magnetic-field measurement system has also been constructed with flip-coils in order to test the cyclotron magnet. In 1992 we have performed a design calculation of the central region to obtain an optimum condition for beam injection from the ion source. In the present work we are aiming at the construction of prototype with no trimming coils under a high magnetic field of about 3.2 T. This should require a high accuracy i n the design calculations, so a program-code has been developed for 3-dimensional simulations. As an optimum condition for beam accelerations have been determined the shape of electrodes, and the voltage and the initial phase for beam injection. In order to test the cyclotron magnet we estimated the heat flow into the liquid-helium reservoir in cryostat by radiation and conduction, and found the consumption of liquid-helium can be minimized to about 3.6 l/hour by using the optimized power-leads. From the work in this project we have found the feasibility for further investigations.

目前的工作是在1991年和1992年进行的。超导回旋加速器的原型一直保存在京都大学化学研究所。回旋加速器有一个半径为15.5厘米的10兆电子伏的质子和约4吨的轭。1991年，我们进行了原型的运输和安装，并在九州大学建立了研究结构。计算了最佳磁场的设计，并考察了平衡轨道和加速轨道上的束流特性。通过最小二乘分析确定了等时和聚焦的最佳条件。这些结果发表在1991年的一次研讨会上。为了测试回旋加速器磁体，还构造了具有翻转线圈的磁场测量系统。在1992年，我们进行了设计计算的中心区域，以获得最佳条件的离子源注入束。在目前的工作中，我们的目标是在约3.2 T的高磁场下，没有微调线圈的原型建设。这应该要求在设计计算中具有高精度，因此已经开发了用于三维模拟的程序代码。作为束流加速的最佳条件，确定了电极的形状、束流注入的电压和初始相位。为了测试回旋加速器磁体，我们估算了通过辐射和传导进入低温恒温器中的液氦储存器的热流，发现通过使用优化的电源引线，液氦的消耗可以最小化到约3.6升/小时。从本项目的工作中，我们发现了进一步研究的可行性。