Magnetic shielding for the Fermilab Vertical Cavity Test Facility

Conference · Mon Sep 01 00:00:00 EDT 2008 · Submitted to IEEE TRANS.APPL.SUPERCOND.

OSTI ID:940096

Ginsburg, Camille M; Reid, Clark; Sergatskov, Dmitri A

A superconducting RF cavity has to be shielded from magnetic fields present during cool down below the critical temperature to avoid freezing in the magnetic flux at localized impurities, thereby degrading the cavity intrinsic quality factor Q{sub 0}. The magnetic shielding 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, was recently completed. For the magnetic shielding design, we used two cylindrical layers: a room temperature 'outer' shield of Amumetal (80% Ni alloy), and a 2K 'inner' shield of Cryoperm 10. The magnetic and mechanical design of the magnetic shielding and measurement of the remanent magnetic field inside the shielding are described.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 940096
• Report Number(s): FERMILAB-CONF-08-348-TD; TRN: US0807006
• Journal Information: Submitted to IEEE TRANS.APPL.SUPERCOND., Conference: Presented at Applied Superconductivity Conference (ASC 2008), Chicago, Illinois, 17-22 Aug 2008
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
CAVITIES
CRITICAL TEMPERATURE
DESIGN
FERMILAB
FREEZING
IMPURITIES
MAGNETIC FIELDS
MAGNETIC FLUX
MAGNETIC SHIELDING
QUALITY FACTOR
SHIELDING
SHIELDS
SUPERCONDUCTIVITY
TESTING
Accelerators