dorsal/arxiv
View SchemaAnalytic Criteria for Power Exhaust in Divertors due to Impurity Radiation
| Authors | D. Post, N. Putvinskaya, F. W. Perkins, W. Nevins |
|---|---|
| Categories | |
| ArXiv ID | plasm-ph/9506002 |
| URL | https://arxiv.org/abs/plasm-ph/9506002 |
| DOI | 10.1016/0022-3115(94)00464-1 |
Abstract
Present divertor concepts for next step experiments such ITER and TPX rely upon impurity and hydrogen radiation to transfer the energy from the edge plasma to the main chamber and divertor chamber walls. The efficiency of these processes depends strongly on the heat flux, the impurity species, and the connection length. Using a database for impurity radiation rates constructed from the ADPAK code package, we have developed criteria for the required impurity fraction, impurity species, connection length and electron temperature and density at the mid-plane. Consistent with previous work, we find that the impurity radiation from coronal equilibrium rates is, in general, not adequate to exhaust the highest expected heating powers in present and future experiments. As suggested by others, we examine the effects of enhancing the radiation rates with charge exchange recombination and impurity recycling, and develop criteria for the minimum neutral fraction and impurity recycling rate that is required to exhaust a specified power. We also use this criteria to find the optimum impurity for divertor power exhaust.
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"abstract": "Present divertor concepts for next step experiments such ITER and TPX rely\nupon impurity and hydrogen radiation to transfer the energy from the edge\nplasma to the main chamber and divertor chamber walls. The efficiency of these\nprocesses depends strongly on the heat flux, the impurity species, and the\nconnection length. Using a database for impurity radiation rates constructed\nfrom the ADPAK code package, we have developed criteria for the required\nimpurity fraction, impurity species, connection length and electron temperature\nand density at the mid-plane. Consistent with previous work, we find that the\nimpurity radiation from coronal equilibrium rates is, in general, not adequate\nto exhaust the highest expected heating powers in present and future\nexperiments. As suggested by others, we examine the effects of enhancing the\nradiation rates with charge exchange recombination and impurity recycling, and\ndevelop criteria for the minimum neutral fraction and impurity recycling rate\nthat is required to exhaust a specified power. We also use this criteria to\nfind the optimum impurity for divertor power exhaust.",
"arxiv_id": "plasm-ph/9506002",
"authors": [
"D. Post",
"N. Putvinskaya",
"F. W. Perkins",
"W. Nevins"
],
"categories": [
"plasm-ph",
"physics.plasm-ph"
],
"doi": "10.1016/0022-3115(94)00464-1",
"title": "Analytic Criteria for Power Exhaust in Divertors due to Impurity Radiation",
"url": "https://arxiv.org/abs/plasm-ph/9506002"
},
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