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Title: High-bandwidth polarimeter for a high density, accelerated spheromak

A three-beam heterodyne polarimeter has been built to diagnose the PI-1 plasma injector at General Fusion, Inc. The polarimeter measures plasma density and Faraday rotation, which can provide estimates of magnetic field magnitude and direction. Two important calibration steps are required for the polarimeter to produce reasonable Faraday rotation signals. Beam polarization ellipticity must be measured to ensure there is a linear Faraday rotation response. In addition, the two beams travelling through the plasma must be collinear to reduce error due to differences in plasma density. Once calibrated, the Faraday rotation signals are in much better agreement with other diagnostics. For a null signal, the Faraday rotation measurement noise floor is 0.1° at 0.5 MHz bandwidth. Comparing preliminary spheromak Faraday rotation measurements to a model, the maximum error is about 0.3° at 0.5 MHz bandwidth, which is primarily due to electrical noise during the injector's capacitor discharge and limitations of the model. At a bandwidth of 0.5 MHz, the polarimeter has an axial resolution between 6 cm and 30 cm depending on the speed of the spheromak, which varies between 30 km/s and 150 km/s. The spheromak length ranges from 0.75 m to 2 m. Additional polarimeter chords will bemore » added in future upgrades.« less
Authors:
;  [1] ;  [2]
  1. Department of Physics, Queen's University, 99 University Ave., Kingston, Ontario K7L 3N6 (Canada)
  2. General Fusion, Inc., 108-3680 Bonneville Pl, Burnaby, British Columbia V3N 4T5 (Canada)
Publication Date:
OSTI Identifier:
22220470
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 84; Journal Issue: 8; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BEAM-PLASMA SYSTEMS; CALIBRATION; CAPACITORS; ELECTRIC DISCHARGES; FARADAY EFFECT; MAGNETIC FIELDS; MAGNETOHYDRODYNAMICS; MHZ RANGE; NOISE; PLASMA CONFINEMENT; PLASMA DENSITY; PLASMA DIAGNOSTICS; POLARIMETERS; SPHEROMAK DEVICES