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Title: Hall probe measurements of the poloidal magnetic field in Compact Toroidal Hybrid plasmas

A linear array of 16 Hall effect sensors has been developed to directly measure the poloidal magnetic field inside the boundary of a non-axisymmetric hybrid torsatron/tokamak plasma. The array consists of miniature gallium arsenide Hall sensor elements mounted 8 mm apart on a narrow, rotatable printed circuit board inserted into a re-entrant stainless steel tube sheathed in boron nitride. The sensors are calibrated on the bench and in situ to provide accurate local measurements of the magnetic field to aid in reconstructing the equilibrium plasma current density profiles in fully three-dimensional plasmas. Calibrations show that the sensor sensitivities agree with the nominal manufacturers specifications of 1.46 V/T. Poloidal fields measured with the Hall sensor array are found to be within 5% of poloidal fields modeled with a Biot-Savart code.
Authors:
 [1] ; ; ; ;  [2]
  1. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
  2. Department of Physics, Auburn University, Auburn, Alabama 36849 (United States)
Publication Date:
OSTI Identifier:
22314448
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 9; Other Information: (c) 2014 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; BORON NITRIDES; CALIBRATION; CURRENT DENSITY; EQUILIBRIUM PLASMA; GALLIUM ARSENIDES; HALL EFFECT; MAGNETIC FIELDS; PRINTED CIRCUITS; SENSITIVITY; STAINLESS STEELS; TOKAMAK DEVICES