Initial Operation of the Second ECRH System on the HSX Stellarator

POSTER

Abstract

A second 200 kW / 28 GHz ECRH system has been installed and tested on the HSX stellarator. The Varian gyrotron VGA-8050M has a multimode output that is dominated by the TE02 mode. The gyrotron was tuned to produce a TEM00 mode with Gaussian distribution at the output of the Vlasov mode converter. The beam pattern and transmission line alignment were measured by observing the temperature increase of a target plate at several locations along the beam line with an infrared camera. Power measurements were made at the input and output of the transmission line, and pulsed power experiments into a target plasma show an increase in stored energy commensurate with previous high power experiments using only a single source. The antenna has a steerable focusing mirror within the HSX vessel that allows power deposition studies, specifically the effect of power deposition on ITB formation in the stellarator. This source can also be modulated for heat pulse propagation experiments.

Authors

  • G.M. Weir

    HSX Plasma Lab, University of Wisconsin

  • K.M. Likin

    HSX Plasma Lab, University of Wisconsin, HSX Plasma Lab, Univeristy of Wisconsin

  • F.S.B. Anderson

    HSX Plasma Lab, University of Wisconsin, HSX Plasma Lab, Univeristy of Wisconsin, HSX Plasma Lab, University of Wisconsin, Madison

  • D.T. Anderson

    HSX Plasma Lab, University of Wisconsin, University of Wisconsin, Madison

  • J.W. Radder

    HSX Plasma Lab, University of Wisconsin

  • J.N. Talmadge

    University of Wisconsin, HSX Plasma Lab, University of Wisconsin, HSX Plasma Laboratory, University of Wisconsin-Madison, University of Wisconsin, Madison, HSX Plasma Lab, University of Wisconsin, Madison