MHZ Isac 11.8聚束器的设计
Design of 11.8 MHZ Buncher for Isac at Triumf
摘要：
TRIUMF的ISAC放射性核束设施的高能束流传输线需要一个11.8 MHz的聚束器。聚束器的主要要求是在cw模式下操作，速度接受度为2.2%，有效电压为100 kV，对于三间隙聚束器，漂移管电压为30 kV。集总元件电路比分布式rf结构更适合于这种低频操作。通过与漂移管电容并联的电感线圈获得11.8MHz的谐振频率。线圈被安置在一个大气压下的无尘盒中，而漂移管被放置在真空室中，射频馈通将它们连接起来。两种设计的这种馈通，一个使用磁盘和一个使用管状陶瓷，在30千伏射频工作，本文介绍。MAFIA和SUPERFISH代码用于模拟馈线中的场，特别是陶瓷-金属界面周围的场。给出了原型馈源的测试结果，并概述了最终解决方案的选择。
英文摘要：
The high energy beam transport (HEBT) line for the ISAC radioactive beam facility at TRIUMF requires an 11.8 MHz buncher. The main requirements of the buncher are to operate in cw mode with a velocity acceptance of 2.2% and an effective voltage of 100 kV, which for a three gap buncher gives a drift tube voltage of 30 kV. A lumped element circuit is more suitable than a distributed rf structure for this low frequency of operation. The resonant frequency of 11.8 MHz is obtained by an inductive coil in parallel with the capacitance of the drift tube. The coil is housed in a dust free box at atmospheric pressure whereas the drift tube is placed in a vacuum chamber and an rf feedthrough connects them. Two design of this feedthrough, one using disk and one using tubular ceramics, operating at 30 kV rf, are described in this paper. MAFIA and SUPERFISH codes are used to simulate the fields in the feedthroughs, particularly around the ceramic metal interfaces. Test results of the prototype feedthroughs are presented and the choice of the proposed final solution is outlined.
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