Meng Tie-Jun, Zhao Kui, Xie Da-Tao, Zhang Bao-Cheng, Wang Li-Fang, Zhu Feng, Chu Xiang-Qiang, Chen Jia-Er. Studies on the improvement of niobium-sputtered quarter wave resonator supercond ucting cavityJ. Acta Physica Sinica, 2003, 52(6): 1515-1519. DOI: 10.7498/aps.52.1515