Superconducting current transducer
The construction and performance of an electric current meter that operates in liquid He and mechanically splits apart to permit replacement of the current carrying conductor is described. It permits the measurement of currents induced in a loop of superconducting cable and expeditious exchange of such loops. It is a key component for a short sample cable testing facility that requires no high current power supplies nor high current leads. Its superconducting pickup circuit involves a non-magnetic core toroidal split-coil that surrounds the conductor and a solenoid whose field is sensed by a Hall probe. This toroidal split-coil is potted inside another compensating toroidal split-coil. The C shaped half toroids can be separated and brought precisely together from outside the cryostat. The Hall probe is energized and sensed by a lock-in amplifier whose output drives a bipolar power supply which feeds the compensating coil. The output is the voltage across a resistor in this feedback circuit. Currents of up to 10 kA can be measured with a precision of 150 mA. 3 refs., 4 figs.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- AC02-76CH03000
- OSTI ID:
- 6326320
- Report Number(s):
- FNAL-TM-1688; ON: DE91004674; TRN: 90-037576
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRITICAL CURRENT
MEASURING METHODS
TRANSDUCERS
HALL EFFECT
MEASURING INSTRUMENTS
SUPERCONDUCTING MAGNETS
TESTING
CURRENTS
ELECTRIC CURRENTS
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
EQUIPMENT
MAGNETS
SUPERCONDUCTING DEVICES
430303* - Particle Accelerators- Experimental Facilities & Equipment
426001 - Engineering- Superconducting Devices & Circuits- (1990-)