PHYSICS PROCESSES IN DISRUPTION MITIGATION USING MASSIVE NOBLE GAS INJECTION [electronic resource].
- San Diego, Calif. : General Atomic Company, 2002.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- 7 pages : digital, PDF file
- Additional Creators:
- General Atomic Company
United States. Department of Energy. Office of Scientific and Technical Information
- Methods for detecting imminent disruptions and mitigating disruption effects using massive injection of noble gases (He, Ne, or Ar) have been demonstrated on the DIII-D tokamak . A jet of high injected gas density (> 10²⁴ m⁻³) and pressure (> 20 kPa) penetrates the target plasma at the gas sound speed (≈300-500 m/s) and increases the atom/ion content of the plasma by a factor of > 50 in several milliseconds. UV line radiation from the impurity species distributes the plasma energy uniformly on the first wall, reducing the thermal load to the divertor by a factor of 10. Runaway electrons are almost completely eliminated by the large density of free and bound electrons supplied by the gas injection. The small vertical plasma displacement before current quench and high ratio of current decay rate to vertical growth rate result in a 75% reduction in peak halo current amplitude and attendant forces.
- Published through SciTech Connect.
29th European Physical Society Conference on Plasma Physics and Controlled Fusion, Montreux (CH), 06/17/2002--06/21/2002.
D.S. GRAY; P.L. TAYLOR; D.A. HUMPHREYS; T.E.EVANS; P.B. PARKS; C.J. LASNIER; D.G. WHYTE; E.M. HOLLMANN; A.W. HYATT; T.C. JERNIGAN; A.G. KELLMAN.
- Funding Information:
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