RF CAVITY WITH CO-BASED AMORPHOUS CORE
RF CAVITY WITH CO-BASED AMORPHOUS CORE
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具有钴基非晶核的射频腔
DOI：
10.1016/j.nima.2006.05.276
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发表时间：
2006
影响因子：
1.4
通讯作者：
T. Kusaka
中科院分区：
文献类型：
--
作者：
M. Kanazawa;T. Misu;A. Sugiura;K. Sato;K. Katsuki;T. Kusaka
一个紧凑的加速腔已经开发与钴基非晶核心，这是研究和开发（R&D）的一部分，在一个癌症治疗设施的同步加速器。该芯具有高磁导率，使得腔长度可以缩短，并且其低q值约为0.5，允许射频系统无需对腔进行调谐控制。所开发的加速腔由两个加速间隙组成；在间隙的两侧有四分之一波同轴谐振器。空腔总长度短至1.5m，真空室内径190mm。考虑到易于操作和维护的要求，在最后阶段使用晶体管射频放大器代替常用的四极管。每个谐振器在2MHz时的最大阻抗为400Ω，并且连接了1:9阻抗变压器以使用50Ω输出阻抗的固态放大器。在0.4 ~ 8MHz的频率范围内，总输入射频功率为8kW，可获得4kV以上的加速电压。本文介绍了谐振腔的结构、得到的磁芯阻抗及其在大功率测试下的性能。
A compact cavity for acceleration has been developed with cobalt-based amorphous cores, which is a part of research and development (R&D) for a synchrotron in a cancer therapy facility. This core has high permeability that enables the cavity length to be made short, and its low Q-value of about 0.5 permits an RF system without tuning control of the cavity. The developed acceleration cavity consists of two acceleration gaps; at both sides of the gap there are quarter-wave coaxial resonators. The total length of the cavity is as short as 1.5m and the inner diameter of the vacuum chamber is 190mm. Considering the requirements for easy operation and maintenance, a transistor RF amplifier was used instead of the commonly used tetrode in the final stage. Each resonator has a maximum impedance of 400Ω at 2MHz, and a 1:9 impedance transformer has been attached to use a solid state amplifier of 50Ω output impedance. In the frequency range from 0.4 to 8MHz, an acceleration voltage of more than 4kV can be obtained with a total input RF power of 8kW. In this paper the structure of the cavity, the obtained core impedance, and their performances under high-power test are presented.