The Variable Input Coupler for the Fermilab Vertical Cavity Test Facility

Author

Champion, Mark ; Ginsburg, Camille M. ; Lunin, Andrei ; Moeller, Wolf-Dietrich ; Nehring, Roger ; Poloubotko, Valeri

Author_Institution

Fermilab, Batavia, IL, USA

Volume

19

Issue

3

fYear

2009

fDate

6/1/2009 12:00:00 AM

Firstpage

1423

Lastpage

1426

Abstract

A variable input coupler has been designed for the Fermilab vertical cavity test facility (VCTF), a facility for testing bare 1.3 GHz 9-cell superconducting radiofrequency (SRF) cavities at 2 K, to provide some flexibility in the test stand measurements. The variable coupler allows the cavity to be critically coupled for all 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.

Keywords

submillimetre wave antennas; superconducting devices; waveguide couplers; Fermilab vertical cavity test facility; antenna position; cryogenic motor; frequency 1.3 GHz; passband modes; standard input coupler; superconducting radiofrequency cavities; superfluid helium; temperature 2 K; variable input coupler; Cavities; couplers;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2009.2018235

Filename

4915547