Variable Input Coupler for the Fermilab Vertical Cavity Test Facility.

Champion, M. ; Ginsburg, C. M. ; Lunin, A. ; Moeller, W. D. ; Nehring, R.

Technical Information Center Oak Ridge Tennessee

关键词: Cavities;    Couplers;    Cryogenics;    Superconductivity;    Testing;   

RP-ID  :  DE2008939700

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

A variable input coupler has been designed for the Fermilab vertical cavity test facility (VCTF), a facility for CW RF vertical testing of bare ILC 1.3 GHz 9-cell SRF cavities at 2K, to provide some flexibility in the test stand RF measurements. The variable coupler allows the cavity to be critically coupled for all RF tests, including all TM010 passband modes, which will simplify or make possible the measurement of those modes with very low end-cell fields, e.g., (pi)/9 mode. The variable coupler assembly mounts to the standard input coupler port on the cavity, and uses a cryogenic motor submerged in superfluid helium to control the antenna position. The RF and mechanical design and RF test results are described.