dorsal/arxiv
View SchemaRadiation Rates for Low Z Impurities in Edge Plasmas
| Authors | R. Clark, J. Abdallah, D. Post |
|---|---|
| Categories | |
| ArXiv ID | plasm-ph/9506001 |
| URL | https://arxiv.org/abs/plasm-ph/9506001 |
| DOI | 10.1016/0022-3115(94)00467-6 |
Abstract
The role of impurity radiation in the reduction of heat loads on divertor plates in present experiments such as DIII-D, JET, JT-60, ASDEX, and Alcator C-Mod, and in planned experiments such as ITER and TPX places a new degree of importance on the accuracy of impurity radiation emission rates for electron temperatures below 250 eV for ITER and below 150 eV for present experiments. We have calculated the radiated power loss using a collisional radiative model for Be, B, C, Ne and Ar using a multiple configuration interaction model which includes density dependent effects, as well as a very detailed treatment of the energy levels and meta-stable levels. The "collisional radiative" effects are very important for Be at temperatures below 10 eV. The same effects are present for higher Z impurities, but not as strongly. For some of the lower Z elements, the new rates are about a factor of two lower than those from a widely used, simpler average-ion package (ADPAK) developed for high Z ions and for higher temperatures. Following the approach of Lengyel for the case where electron heat conduction is the dominant mechanism for heat transport along field lines, our analysis indicates that significant enhancements of the radiation losses above collisional radiative model rates due to such effects as rapid recycling and charge exchange recombination will be necessary for impurity radiation to reduce the peak heat loads on divertor plates for high heat flux experiments such as ITER.
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"abstract": "The role of impurity radiation in the reduction of heat loads on divertor\nplates in present experiments such as DIII-D, JET, JT-60, ASDEX, and Alcator\nC-Mod, and in planned experiments such as ITER and TPX places a new degree of\nimportance on the accuracy of impurity radiation emission rates for electron\ntemperatures below 250 eV for ITER and below 150 eV for present experiments. We\nhave calculated the radiated power loss using a collisional radiative model for\nBe, B, C, Ne and Ar using a multiple configuration interaction model which\nincludes density dependent effects, as well as a very detailed treatment of the\nenergy levels and meta-stable levels. The \"collisional radiative\" effects are\nvery important for Be at temperatures below 10 eV. The same effects are present\nfor higher Z impurities, but not as strongly. For some of the lower Z elements,\nthe new rates are about a factor of two lower than those from a widely used,\nsimpler average-ion package (ADPAK) developed for high Z ions and for higher\ntemperatures. Following the approach of Lengyel for the case where electron\nheat conduction is the dominant mechanism for heat transport along field lines,\nour analysis indicates that significant enhancements of the radiation losses\nabove collisional radiative model rates due to such effects as rapid recycling\nand charge exchange recombination will be necessary for impurity radiation to\nreduce the peak heat loads on divertor plates for high heat flux experiments\nsuch as ITER.",
"arxiv_id": "plasm-ph/9506001",
"authors": [
"R. Clark",
"J. Abdallah",
"D. Post"
],
"categories": [
"plasm-ph",
"physics.plasm-ph"
],
"doi": "10.1016/0022-3115(94)00467-6",
"title": "Radiation Rates for Low Z Impurities in Edge Plasmas",
"url": "https://arxiv.org/abs/plasm-ph/9506001"
},
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