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Title: Reduction of plasma density in the Helicity Injected Torus with Steady Inductance experiment by using a helicon pre-ionization source

A helicon based pre-ionization source has been developed and installed on the Helicity Injected Torus with Steady Inductance (HIT-SI) spheromak. The source initiates plasma breakdown by injecting impurity-free, unmagnetized plasma into the HIT-SI confinement volume. Typical helium spheromaks have electron density reduced from (2–3) × 10{sup 19} m{sup −3} to 1 × 10{sup 19} m{sup −3}. Deuterium spheromak formation is possible with density as low as 2 × 10{sup 18} m{sup −3}. The source also enables HIT-SI to be operated with only one helicity injector at injector frequencies above 14.5 kHz. A theory explaining the physical mechanism driving the reduction of breakdown density is presented.
Authors:
; ;  [1] ; ; ;  [2] ;  [3]
  1. Department of Aeronautics and Astronautics, University of Washington, Seattle, Washington 98195 (United States)
  2. Eagle Harbor Technologies, Inc., 119 W. Denny Way, Suite 210, Seattle, Washington 98119 (United States)
  3. 979B West Moorhead Circle, Boulder, Colorado 80305 (United States)
Publication Date:
OSTI Identifier:
22220383
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 84; Journal Issue: 10; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DEUTERIUM; ELECTRON DENSITY; HELICITY; HELIUM; HIGH-FREQUENCY DISCHARGES; INDUCTANCE; KHZ RANGE; PLASMA CONFINEMENT; PLASMA DENSITY; SPHEROMAK DEVICES