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0‐D Modeling of Fast Radiative Shutdown of Tokamak Discharges Following Massive Gas Injection
Author(s) -
Hollmann E. M.,
Parks P. B.,
Scott H. A.
Publication year - 2008
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.200810045
Subject(s) - tokamak , opacity , plasma , impurity , radiative transfer , atomic physics , radiation , shutdown , physics , materials science , argon , radiative cooling , nuclear physics , computational physics , optics , thermodynamics , quantum mechanics
0‐D modeling of fast radiative shutdowns of tokamak discharges following massive gas injection is presented. Realistic neutral deposition rates are used together with a 1‐D diffusive model to estimate impurity deposition into the plasma. Non‐coronal radiation rates including opacity are used, as are induced wall currents, wall impurity radiation, and neutral and neoclassical corrections to plasma resistivity. The 0‐D modeling is found to reproduce the shutdown timescale and free electron density rise seen in DIII‐D argon injection experiments well. Opacity, wall currents, and wall impurities can all have a significant (>10%) impact on simulated timescales. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)