Abstract
In the Helicity Injected Tokamak, magnetic probes are mounted in the tungsten-coated, copper walls surrounding the plasma so that they do not act as limiters. The magnetic field attenuation from the copper, tungsten, and inconel (supporting the probe) depends on frequency. With their signals analyzed by Fourier techniques, probes are calibrated in place to known magnetic fields containing the spectral range of interest. Once a frequency response for each probe is determined, probe signals from plasma discharges are deconvolved to extract the true magnetic field at the plasma surface. The frequency response falls off at the expected R/L and skin frequencies. Deconvolution of probe signals can amplify high frequency bit noise, but noncausal, lowpass filters can correct this problem for most probes. Small low frequency error, caused by spectral leakage, is corrected by splicing a decaying signal onto the raw data. The probes are useful within the frequency range, 4 Hz<f<300 kHz.
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