Abstract
The time-integrated 2D profile of the thick-target bremsstrahlung produced by energetic end loss electrons has been measured during electron cyclotron resonance heating (ECRH) operation of TMX-U. Sheets of x-ray film and/or arrays of thermoluminescent dosimeters were placed on the outside of the end tank end wall to measure the relative spatial x-ray profile, with locally added filters of Pb to determine the effective mean x-ray energy. The purpose of this simple survey diagnostic was to allow deduction of the gross features of the ECRH region. The electron source functions needed to fit the x-ray data were modeled for various anchor cell radial distributions mapped along magnetic field lines to the elliptical plasma potential control plates or the Al end walls. The data are generally consistent with (1) major ECR heating in the central 25-cm-diameter core, (2) a mean ECRH electron-loss energy of 420 keV, and (3) and ECRH coupling efficiency to these hot electrons of ≥10%.
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