Nuclear Techniques ›› 2015, Vol. 38 ›› Issue (10): 100201-100201.doi: 10.11889/j.0253-3219.2015.hjs.38.100201

• LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS • Previous Articles     Next Articles

Design and test of the helium pneumatic tuner based on 162.5 MHz superconducting cavity

LI Tao ZHANG Bin LIU Lubei HE Yuan ZHANG Shenghu   

  1. (Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China)
  • Received:2015-03-20 Revised:2015-05-16 Online:2015-10-10 Published:2015-10-14

Abstract: Background: 162.5 MHz (?=0.10) Half Wave Resonance (HWR) superconducting cavity is used for the low-energy section of injection II in the China Initiative Accelerator Driven System (CIADS) project. Purpose: The helium pneumatic tuner is designed on the tuning range and performance requirements of the mentioned cavity above. There is no domestic reference. Methods: In order to make sure that it would run well, room temperature test was made. Results: In the test of copper modal cavity, the tuning range reached 640 kHz, which satisfied the tuning range requirements. In the test of Niobium cavity, the connection of the frequency with the gas pressure was satisfied, the tuning sensitivity was 0.272 kHz?hPa?1. Gas mass flow control scheme was put forward. And a pneumatic platform for resolution test was set up. In the test, the tuner met the requirement of the tuning resolution, of which the resolution precision reached 4.4–15 Hz. The heat transfer between superconducting cavity and the tuner was calculated, and its value was no more than 0.002 W, which was lower than the thermal radiation between the cryostat and the tuner. Conclusion: The tuner could be used for HWR cavity.

Key words: Helium pneumatic, Tuning, Superconducting cavity, Control of gas mass flow