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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.
The static thermal load and the unloaded quality factor of the superconducting cavity are the most important parameters to characterize the performance of the superconducting cavity cryostat and the superconducting niobium cavity.The BEPCⅡ superconducting cavity adopts liquid ammonia immersion cooling method, The test chamber was cooled at the test station, and the static heat loss was measured after the superconducting chamber reached the superconducting state and stable operation. In addition, the measurement of the superconducting cavity Q_0 was mainly measured by thermodynamic method Frequency loss and then calculate Q_0.The measuring principle and method of static thermal load and no-load quality factor of BEPCⅡ superconducting cavity are introduced, and the test results of two superconducting cavities under different high-frequency accelerating voltage are given. Test results have been used as BEPC Ⅱ superconducting cavity acceptance test an important basis.