SSC-LINAC是为兰州重离子研究装置(HIRFL)设计的直线注入器,它将U34+离子加速到1 MeV/u注入到分离扇回旋加速器(SSC)中,为冷却储存环(CSR)提供10 MeV/u的U34+.该注入器可以将SSC引出的重离子流强提高一个量级以上.SSC-LINAC由一个RFQ(Radio Frequency Quadrupole)加速器和4个DTL(drift tube linac)组成,设计频率为53.667 MHz.RFQ工作在连续波模式,设计功率30 kW,如果不能有效地冷却,高频电流在电极表面产生的热量会使RFQ的腔壁和电极发生形变,从而导致腔体频率的漂移以及加速和聚焦电场的改变.因此,为了保证连续波工作的RFQ加速器稳定运行,对水冷模式和通道设计提出了很高的要求.作者用有限元软件ANSYS对RFQ进行高频电磁场、温度场、结构应力的耦合分析,验证了冷却方案设计的可行性和可靠性.
Heavy Ion Research Facility at Lanzhou(HIRFL) consists of SFC,SSC,CSRm and CSRe.A new linac injector,which will increase U34+ to 1 MeV/u,is designed for SSC to increase the beam intensity to ten times higher.The new injector,whose frequency is 53.667 MHz,is composed by a RFQ (Radio Frequency Quadrupole) cavity and four DTL(Drift Tube Linac) cavities.The RFQ cavity,whose RF power is 30 kW,is operated at CW(continuous wave) mode.The heat produced by HF (high frequency) electromagnetic will cause deformation of RFQ structure,lead to the resonant frequency shift,and reduce the focusing efficiency of the cavity.An efficient cooling system is necessary to ensure that the RFQ cavity can stably be operated at the nominal frequency.A detailed multi-physics field coupling analysis of RFQ has been finished with 3D finite elements software ANSYS.The result of the analysis shows that the water cooling system can cool the RFQ cavity fully and keep the frequency drift be in a acceptable level.
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