Laser Blow-Off Impurity Injection Experiments at the HSX Stellarator

POSTER

Abstract

Experiments are under way to measure impurity transport in a quasisymmetric stellarator for the first time. A laser blow-off impurity injection system, which is capable of rapidly depositing a small, controlled quantity of a wide variety of solid impurities into the confinement volume, has been installed and successfully tested. AXUV photodiode arrays equipped with optional soft x-ray filters have also been installed on the machine. The arrays will take time-resolved measurements of the impurity radiation, which will be inverted into radial profile and then interpreted using the transport code, STRAHL and atomic data from ADAS to determine the transport coefficients within the paradigm of a diffusivity and convective velocity. Details of the system and first results will be presented along with PENTA calculations of the neoclassical predicted impurity transport

Authors

  • C. Clark

    University of Wisconsin, HSX Plasma Lab, Univeristy of Wisconsin

  • D.T. Anderson

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

  • F.S.B. Anderson

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

  • K.M. Likin

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

  • Jeremy Lore

    ORISE, ORNL, ORNL, Oak Ridge National Lab, HSX Plasma Lab, Univeristy of Wisconsin, Oak Ridge National Laboratory

  • K. Zhai

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

  • Jeremy Lore

    ORISE, ORNL, ORNL, Oak Ridge National Lab, HSX Plasma Lab, Univeristy of Wisconsin, Oak Ridge National Laboratory