Development of deflector cavity and RF amplifier for bunch length detector system
Development of deflector cavity and RF amplifier for bunch length detector system
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DOI：
10.1088/1748-0221/11/02/t02001
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发表时间：
2016-02
影响因子：
1.3
通讯作者：
H. Pandey;T. Bhattacharya;A. Chakrabarti
中科院分区：
文献类型：
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作者：
H. Pandey;T. Bhattacharya;A. Chakrabarti
为了测量VECC放射性离子束（RIB）装置的束团长度，研制了一种最小截取束团长度探测器系统。该探测器系统基于一次离子束撞击位于束路中的细钨丝产生的二次电子发射，本文报道了偏转器腔及其射频系统的设计、研制和离线测试结果。偏转腔是由两个300 W的放大器模块组合而成的电容加载螺旋型λ/2谐振腔，由37.8MHz固态放大器驱动，功率为500 W。谐振器的测量RF特性，如频率，Q值和并联阻抗已被发现是相当不错的，接近的分析估计和模拟结果。讨论了放大器各组成部分的设计原理和测试结果。全功率测试结果表明，在单个模块水平上，谐波分离效果良好，当模块组合在一起时，谐波分离效果进一步改善。文中还报道了偏转腔与放大器的高功率性能测试结果。
A minimally-interceptive bunch length detector system is being developed for measurement of longitudinal dimension of the bunch beam from RFQ of the radioactive ion beam (RIB) facility at VECC. This detector system is based on secondary electrons emission produced by the primary ion beam hitting a thin tungsten wire placed in the beam path. In this paper we report the design, development and off line testing results of deflector cavity together with its RF sysytem. The deflector cavity is a capacitive loaded helical type λ/2 resonator driven by RF source of 500 W at 37.8 MHz solid state amplifier, realized by combining two amplifier modules of 300 W each. The measured RF characteristics of the resonator, such as frequency, Q value and shunt impedance have been found to be reasonably good and close to the analytical estimation and results of simulation. The design philosophy and test results of individual components of the amplifier are discussed. The test result upto full power shows a good harmonic separation at the individual module level and this is found to improve further when modules are combined together.The results of high power performance test of the deflector cavity together with amplifier are also reported.