Calculated radiative power losses from mid- and high-Z impurities in Tokamak plasmas
- Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)
- Plasma Spectroscopy Group, The Johns Hopkins University, Baltimore, Maryland 21218 (United States)
- Associazione EURATOM-ENEA sulla Fusione, Centro Riccerche Frascati C.P. 65-00044 Frascati, Rome (Italy)
- Plasma Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts, 02139 (United States)
This paper summarizes recent calculations of the radiative cooling coefficient for molybdenum (Z=42), krypton (Z=36) and argon (Z=18). The radiative processes considered are collisional-radiative line emission, dielectronic recombination line emission, and radiative recombination and bremsstrahlung continuum emission. Collisional-radiative line emission dominates the power loss channels for a given impurity at all but the highest plasma electron temperatures. The atomic data for the line emission are computed ab initio with the HULLAC atomic physics suite of codes. Relativistic, ab initio atomic physics data are used to compute ionization and recombination rate coefficients; the resulting charge state distribution and recombination rates are used to estimate the radiative power from recombination processes. The calculations in the present work are benchmarked against absolute measurements of ion brightness profiles in the Frascati Tokamak Upgrade plasma. Integrated measurements from tokamak plasmas such as bolometry are then simulated. The atomic physics data used to predict the emissivity of individual ions is validated; the calculated cooling coefficients agree well with bolometric measurements.
- OSTI ID:
- 21202609
- Journal Information:
- AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 443; ISSN APCPCS; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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