Researches and Preliminary Experiments on Copper-Niobium Sputtered Low-β Superconducting Resonator

HAO Jian-Kui; ZHAO Kui; ZHANG Bao-Cheng; XIE Da-Lin; WANG Li-Fang; QUAN Sheng-Wen; SHEN Zi-Lin; TANG Yu-Xing; ZHANG Yun-Chi; YANG Xi; HU Yan-Le; ZHAO Kun

Chinese Physics C> 2001, Vol. 25> Issue(6) : 582-587

Researches and Preliminary Experiments on Copper-Niobium Sputtered Low-β Superconducting Resonator

MOE Key Laboratory of Heavy Ion Physics, Peking University, Beijing 100871, China

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Superconducting resonator is the important component of a superconducting accelerator. The best choice of the acceleration cavity for heavy ion superconducting accelerator is quarter wave resonator (QWR). By sputtering a layer of niobium films of several microns on the OFHC copper substrate, good superconducting properties and acceleration properties of the cavity can be obtained. However, it is very difficult to get uniform niobium films by sputtering because the inner surface of the QWR is complicated. To deal with this problem, we developed a multiparameter adjusting method to control the sputtering process of different parts of the QWR. A layer of uniform niobium film with nice superconducting performance is obtained. The low temperature experiments with liquid helium show that the Cu Nb QWR has good superconducting characters. The Q value of the cavity is about 5×10⁸.

References

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. Benvenuti C,Calatroni S et al.Particle Accelerators,1998,61:371—3822. Stark S,Palmieri V et al.Niobium Sputter-coated QWRs.In the Proceedings of the 8th Workshop on RF Superconductivity,Abano Terme(Padova),Italy,1997.October 6—10,11563. HAO Jian-Kui et al.Nuclear Technology,2000,23(1):36—38(in Chinese)(郝建奎等.核技术,2000,23(1):36—38)4. XU Xue-Ji,ZHU Ding-Chang.Gases Discharge Physics.Shanghai:Fudan University Publishing House,1996.106(徐学基,诸定昌.气体放电物理.上海:复旦大学出版社,1996.106)5. WANG Hong-Hong,TIAN Min-Bo.Enhancement of Surfaces by Ion Beams.Mechanical Industry Publishing House,1992.51(汪泓宏,田民波.离子束表面强化.机械工业出版社,1992.51)6. Palmieri V et al.Sputtering of Niobium Thin Films onto Copper Quarter Wave Resonators.In the Proceedings of the 5th Workshop on RF Superconductivity.DESY Hamburg,Germany,1991.August 19—23,473

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HAO Jian-Kui, ZHAO Kui, ZHANG Bao-Cheng, XIE Da-Lin, WANG Li-Fang, QUAN Sheng-Wen, SHEN Zi-Lin, TANG Yu-Xing, ZHANG Yun-Chi, YANG Xi, HU Yan-Le and ZHAO Kun. Researches and Preliminary Experiments on Copper-Niobium Sputtered Low-β Superconducting Resonator[J]. Chinese Physics C, 2001, 25(6): 582-587.

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Received: 2000-05-22
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Researches and Preliminary Experiments on Copper-Niobium Sputtered Low-β Superconducting Resonator

Corresponding author: HAO Jian-Kui,

MOE Key Laboratory of Heavy Ion Physics, Peking University, Beijing 100871, China

Received Date: 2000-05-22

Accepted Date: 1900-01-01

Available Online: 2001-06-05

Abstract: Superconducting resonator is the important component of a superconducting accelerator. The best choice of the acceleration cavity for heavy ion superconducting accelerator is quarter wave resonator (QWR). By sputtering a layer of niobium films of several microns on the OFHC copper substrate, good superconducting properties and acceleration properties of the cavity can be obtained. However, it is very difficult to get uniform niobium films by sputtering because the inner surface of the QWR is complicated. To deal with this problem, we developed a multiparameter adjusting method to control the sputtering process of different parts of the QWR. A layer of uniform niobium film with nice superconducting performance is obtained. The low temperature experiments with liquid helium show that the Cu Nb QWR has good superconducting characters. The Q value of the cavity is about 5×10⁸.

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Researches and Preliminary Experiments on Copper-Niobium Sputtered Low-β Superconducting Resonator

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