Current measurements by Faraday rotation in single-mode optical fibers
Development of techniques for measuring magnetic fields and currrents by Faraday rotation in single-mode optical fibers has continued. We summarize the results of attempts to measure the toroidal plasma current in the ZT-40 reversed field pinch using multiturn fiber coils. The fiber response is reproducible and in accord with theory, but the amount and distribution of the stress-induced birefringence in this case are such that prediction of the sensor response at low currents is difficult if not impossible. The low-current difficulty can be overcome by twisting the fiber to induce a circular birefringence bias. We report the results of auxiliary experiments with a fiber that has been twisted with 15 turns per meter and then recoated to lock the twist in place.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- OSTI ID:
- 5539523
- Journal Information:
- Rev. Sci. Instrum.; (United States), Vol. 56:5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
OPTICAL FIBERS
BIREFRINGENCE
FARADAY EFFECT
PLASMA DIAGNOSTICS
ZT-40 DEVICES
ELECTRIC CURRENTS
MAGNETIC FIELDS
FIBER OPTICS
POLARIZATION
SILICA
CHALCOGENIDES
CURRENTS
FIBERS
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
REFRACTION
SILICON COMPOUNDS
SILICON OXIDES
700102* - Fusion Energy- Plasma Research- Diagnostics