Triumf 8米长CW探测外来离子的性能
CW Performance of the Triumf 8 Meter Long RFQ for Exotic Ions
摘要：
ISAC 35 MHz离子加速器设计用于在连续波模式下将A/q高达30的离子从2keV/u加速到150 keV/u。该结构长8米，叶片形杆由19个间隔40厘米的环支撑。该设计的一个不寻常的特点是恒定的同步相位为-25;聚束器和整形器部分被取消，有利于外部多谐波聚束器。所有19个环都安装有四个棒电极的正交定位，对齐到+/-0.08 mm。测量到沿8米长的环的相对场变化和四重不对称性在+/-1%以内。早期在峰值电极间电压（75 kV）下的操作受到由于场发射导致的暗电流快速增长的限制; 75 kW的标称操作功率在几个小时内增加到100 kW。一个高功率脉冲程序，然后连续运行，几乎消除了问题，导致在全功率下成功进行了150小时的测试。成功的束流测试结果证实了束流动力学和射频设计。
英文摘要：
The ISAC 35 MHz RFQ is designed to accelerate ions of A/q up to 30 from 2keV/u to 150keV/u in cw mode. The RFQ structure is 8 meters long and the vane-shaped rods are supported by 19 rings spaced 40 cm apart. An unusual feature of the design is the constant synchronous phase of -25; the buncher and shaper sections are eliminated in favor of an external multi-harmonic buncher. All 19 rings are installed with quadrature positioning of the four rod electrodes aligned to +/- 0.08 mm. Relative field variation and quadruple asymmetry along the 8 meters of the RFQ was measured to be within +/- 1%. Early operation at peak inter-electrode voltage (75kV) was restricted by the rapid growth of dark currents due to field emission; the nominal operating power of 75 kW increased to 100 kW in a few hours. A program of high power pulsing, followed by cw operation have all but eliminated the problem leading to a successful 150 hour test at full power. Successful beam test results confirm beam dynamics and rf designs.
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