ADS注入器Ⅱ RFQ加速器研制及测试

Development and Test of ADS Injector Ⅱ RFQ Accelerator

摘要: ADS注入器Ⅱ RFQ加速器用来将10 mA的质子束流从能量35 keV提高到2.1 MeV。该RFQ加速器的结构采用了美国SNS RFQ的设计，其横截面形状为正方形，采用π模稳定杆来增加腔体的高频稳定性。腔体冷态测试结果显示，其场平整度好于±0.01，无载Q值为13 000。经长时间锻炼，腔体最终实现了连续波工作状态。在流强为10 mA时进行了脉冲束流和连续束流的加载实验，对束流的测量结果显示，束流传输效率为95.3%，输出能量为2.165 MeV，束流能散为1.9%，束流水平和竖直横向发射度均为0.33 πmm•mrad。

Abstract: The injector Ⅱ RFQ accelerator of ADS is used to accelerate protons of 10 mA from 35 keV to 2.1 MeV. The cavity structure of the RFQ is the same as that of the SNS RFQ which has a square cross section, and it adopts π-mode rods to enhance the RF (radio frequency) stability of the cavity. Low power tests show that the flatness of the cavity is better than ±0.01 and the unloaded Q value is 13 000. CW (continuous wave) working condition was realized after a long time conditioning of the cavity. Beam tests were conducted with a current of 10 mA in pulse mode and CW mode, respectively, and it indicates that the transmission efficiency is 95.3%, output energy is 2.165 MeV, energy spread is 1.9%, and the transverse and longitudinal emittances are all 0.33 πmm•mrad.