New calorimetric AC loss measurement technique involving superfluid helium

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:416665

Baudouy, B J.P.; Bartholomew, K; Van Sciver, S W ^[1]

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1. Florida State Univ., Tallahassee, FL (United States)

The authors have developed a new calorimetric AC loss measurement facility involving superfluid helium (He II). At present, the Test of AC Loss (TACL) facility performs AC loss measurements on Cable-in-Conduit Conductors (CICC) under development for the NHMFL 45 Tesla hybrid superconducting outsert magnet. TACL can handle large scale conductors up to one meter in length. Measurements utilize the exceptional high heat conductivity of He II, which provides an isothermal environment and is the dominant enthalpy in the system. The test conductors are placed in an independent cryostat containing He II which is inserted in a superconducting dipole magnet producing a transverse magnetic field up to 7 T. For a change of the magnetic field and associated AC loss, the temperature variation of the He II surrounding the conductor is measured and directly converted to enthalpy variation of the He II. This paper describes the measurement technique and compares its resolution to that of more conventional calorimetric AC loss measurements.

• OSTI ID: 416665
• Report Number(s): CONF-950722--; CNN: Grant DMR 9016241
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
AC LOSSES
CALORIMETRY
HELIUM II
MEASURING METHODS
SUPERCONDUCTING CABLES