Measurements of Static Heat Loss and Unloaded Q_0 on the BEPCⅡ SRF Cavities  

BEPCⅡ超导腔静态热负荷和无载品质因数Q_0的测量

作　　者：边琳[1] 李少鹏[1] 刘亚萍[1] 

机构地区：[1]中国科学院高能物理研究所,北京100049

出　　处：《Chinese Physics C》2008年第z1期166-168,共3页中国物理C（英文版）

摘　　要：The static heat loss and unloaded Q_0 are the most important values for both the cryogenic and the RF systems.The BEPCⅡ SRF cavity operates in a liquid helium bath contained in a vacuum insulated,liquid nitrogen cooled radiation shielded vessel.During the horizontal test at the test station,thermodynamic method is used to measure and calculate the static loss and Q_0 value of the SRF cavity.This paper has briefly introduced the method and process to measure the static loss and Q_0 value of the SRF cavity.The results under different experimental conditions are presented as important data for acceptance test of the SRF cavity.超导腔的静态热负荷和无载品质因数是表征超导腔低温恒温器以及超导铌腔性能好坏的最重要参数.BEPCⅡ超导腔采用的是液氨浸泡冷却方式,对两个超导腔在测试站分别进行了降温调试,在超导腔达到超导状态并稳定运行后,对其静态热损耗进行了测定.此外,超导腔Q_0的测量主要是采用热力学的方法测量其高频损耗然后经计算得出Q_0.介绍了BEPCⅡ超导腔静态热负荷和无载品质因数的测量原理及方法,并且给出了两个超导腔在不同高频加速电压下的测试结果.此测试结果已作为BEPCⅡ超导腔验收测试的重要依据.

关 键 词：BEPCⅡ CRYOGENIC SRF cavity heat loss unloaded Q_0 

分 类 号：TL506[核科学技术—核技术及应用]