The variable input coupler for the Fermilab Vertical Cavity Test Facility

Conference · Mon Sep 01 00:00:00 EDT 2008

OSTI ID:939700

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

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.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 939700
• Report Number(s): FERMILAB-CONF-08-349-TD
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ANTENNAS
Accelerators
CAVITIES
CRYOGENICS
DESIGN
FERMILAB
FLEXIBILITY
HELIUM
MOTORS
SUPERCONDUCTIVITY
TESTING