The variable input coupler for the fermilab vertical cavity test facility

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

doi:10.1109/TASC.2009.2018235

The variable input coupler for the fermilab vertical cavity test facility

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

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

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., πt/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.

Original language	English
Article number	4915547
Pages (from-to)	1423-1426
Number of pages	4
Journal	IEEE Transactions on Applied Superconductivity
Volume	19
Issue number	3
DOIs	https://doi.org/10.1109/TASC.2009.2018235
State	Published - Jun 2009
Externally published	Yes

Funding

Manuscript received August 22, 2008. First published May 12, 2009; current version published July 15, 2009. The work herein has been performed at Fer-milab, which is operated by Fermi Research Alliance, LLC Contract DE-AC02-07CH11359 with the US Department of Energy. M. Champion, C. M. Ginsburg, A. Lunin, R. Nehring, and V. Poloubotko are with Fermilab, Batavia, IL, USA (e-mail: [email protected]). W.-D. Moeller is with DESY, Notkestrasse 82, 22607 Hamburg, Germany. Color versions of one or more of the figures in this paper are available online at http://ieeexplore.ieee.org. Digital Object Identifier 10.1109/TASC.2009.2018235

Funders	Funder number
Fermi Research Alliance, LLC	DE-AC02-07CH11359
US Department of Energy

Keywords

Cavities
Couplers

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10.1109/TASC.2009.2018235

Cite this

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The variable input coupler for the fermilab vertical cavity test facility

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