Empirical evaluation of the radiative cooling coefficient for krypton gas in the FTU plasma
- ENEA, Centro Ricerche Frascati, Rome (Italy). Associazione EURATOM-ENEA sulla Fusione
- Johns Hopkins Univ., Baltimore, MD (United States)
For future fusion reactors, a careful balance must be achieved between the cooling of the outer plasma via impurity radiation and the deleterious effects of inevitable core penetration by impurity ions. We have injected krypton gas into the Frascati Tokamak Upgrade (FTU) plasma. The measured visible bremsstrahlung and bolometric signals from krypton have been inverted and the resulting radial impurity density profile and power loss profile for krypton gas are extracted. Using the measured electron density and temperature profiles, the radiative cooling coefficient for krypton is derived. The level of intrinsic impurities (Mo, Cr, Mn and Fe) in the plasma during the krypton puffing is monitored with a VUV SPRED spectrometer. Models for krypton emissivity from the literature are compared to our measured results. 7 figs.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 587131
- Report Number(s):
- UCRL-ID-129078; ON: DE98051340; TRN: 98:004560
- Resource Relation:
- Other Information: PBD: 18 Nov 1997
- Country of Publication:
- United States
- Language:
- English
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