Study of Z scaling of runaway electron plateau final loss energy deposition into wall of DIII-D
Controlled runaway electron (RE) plateau-wall strikes with different initial impurity levels are used to study the effect of background plasma ion charge Z (resistivity) on RE-wall loss dynamics. It is found that Joule heating (magnetic to kinetic energy conversion) during the final loss does not go...
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| Veröffentlicht in: | Physics of plasmas 2017-06, Vol.24 (6) |
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| creator | Hollmann, E. M. Commaux, N. Eidietis, N. W. Lasnier, C. J. Rudakov, D. L. Shiraki, D. Cooper, C. Martin-Solis, J. R. Parks, P. B. Paz-Soldan, C. |
| description | Controlled runaway electron (RE) plateau-wall strikes with different initial impurity levels are used to study the effect of background plasma ion charge Z (resistivity) on RE-wall loss dynamics. It is found that Joule heating (magnetic to kinetic energy conversion) during the final loss does not go up monotonically with increasing Z but peaks at intermediate Z ∼ 6. Joule heating and overall time scales of the RE final loss are found to be reasonably well-described by a basic 0D coupled-circuit model, with only the loss time as a free parameter. This loss time is found to be fairly well correlated with the avalanche time, possibly suggesting that the RE final loss rate is limited by the avalanche rate. First attempts at measuring total energy deposition to the vessel walls by REs during the final loss are made. At higher plasma impurity levels Z > 5, energy deposition to the wall appears to be consistent with modeling, at least within the large uncertainties of the measurement. At low impurity levels Z |
| doi_str_mv | 10.1063/1.4985086 |
| format | Article |
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M. ; Commaux, N. ; Eidietis, N. W. ; Lasnier, C. J. ; Rudakov, D. L. ; Shiraki, D. ; Cooper, C. ; Martin-Solis, J. R. ; Parks, P. B. ; Paz-Soldan, C.</creator><creatorcontrib>Hollmann, E. M. ; Commaux, N. ; Eidietis, N. W. ; Lasnier, C. J. ; Rudakov, D. L. ; Shiraki, D. ; Cooper, C. ; Martin-Solis, J. R. ; Parks, P. B. ; Paz-Soldan, C. ; General Atomics, San Diego, CA (United States) ; Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)</creatorcontrib><description>Controlled runaway electron (RE) plateau-wall strikes with different initial impurity levels are used to study the effect of background plasma ion charge Z (resistivity) on RE-wall loss dynamics. It is found that Joule heating (magnetic to kinetic energy conversion) during the final loss does not go up monotonically with increasing Z but peaks at intermediate Z ∼ 6. Joule heating and overall time scales of the RE final loss are found to be reasonably well-described by a basic 0D coupled-circuit model, with only the loss time as a free parameter. This loss time is found to be fairly well correlated with the avalanche time, possibly suggesting that the RE final loss rate is limited by the avalanche rate. First attempts at measuring total energy deposition to the vessel walls by REs during the final loss are made. At higher plasma impurity levels Z > 5, energy deposition to the wall appears to be consistent with modeling, at least within the large uncertainties of the measurement. At low impurity levels Z < 5, however, local energy deposition appears around 5–20× less than expected, suggesting that the RE energy dissipation at low Z is not fully understood.</description><identifier>ISSN: 1070-664X</identifier><identifier>EISSN: 1089-7674</identifier><identifier>DOI: 10.1063/1.4985086</identifier><identifier>CODEN: PHPAEN</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>70 PLASMA PHYSICS AND FUSION TECHNOLOGY ; Avalanches ; Deposition ; Energy ; Energy conversion ; Energy dissipation ; Energy measurement ; Impurities ; Ion charge ; Kinetic energy ; Ohmic dissipation ; Plasma physics ; Resistance heating</subject><ispartof>Physics of plasmas, 2017-06, Vol.24 (6)</ispartof><rights>Author(s)</rights><rights>2017 Author(s). 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It is found that Joule heating (magnetic to kinetic energy conversion) during the final loss does not go up monotonically with increasing Z but peaks at intermediate Z ∼ 6. Joule heating and overall time scales of the RE final loss are found to be reasonably well-described by a basic 0D coupled-circuit model, with only the loss time as a free parameter. This loss time is found to be fairly well correlated with the avalanche time, possibly suggesting that the RE final loss rate is limited by the avalanche rate. First attempts at measuring total energy deposition to the vessel walls by REs during the final loss are made. At higher plasma impurity levels Z > 5, energy deposition to the wall appears to be consistent with modeling, at least within the large uncertainties of the measurement. At low impurity levels Z < 5, however, local energy deposition appears around 5–20× less than expected, suggesting that the RE energy dissipation at low Z is not fully understood.</description><subject>70 PLASMA PHYSICS AND FUSION TECHNOLOGY</subject><subject>Avalanches</subject><subject>Deposition</subject><subject>Energy</subject><subject>Energy conversion</subject><subject>Energy dissipation</subject><subject>Energy measurement</subject><subject>Impurities</subject><subject>Ion charge</subject><subject>Kinetic energy</subject><subject>Ohmic dissipation</subject><subject>Plasma physics</subject><subject>Resistance heating</subject><issn>1070-664X</issn><issn>1089-7674</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><recordid>eNp90M1KxDAUBeAiCo6jC98g6Eqh402bpOlSZvwpDLhQQdyENE3HDrWpSerQt7elogvBVW7g4yT3BMEphgUGFl_hBUk5Bc72ghkGnoYJS8j-OCcQMkZeDoMj57YAQBjls0A8-q7okSnRK3JK1lWzGS-2a-RO9kjXWnlrGtTW0mvZobJqZI1q4xzSjbabHhW6Na7y1YCqxhu0k3U9RqyyLAtXx8FBKWunT77PefB8e_O0vA_XD3fZ8nodqpinPoxVTKmMEpbmkJOCxxTynBISQxpHheKS5QRYwRLISyZlXtKSJ4oUQBNOE5XH8-BsyjXOV8Kpymv1pkzTDP8XmGCSRnRA5xNqrfnotPNiazo7LOREhDHDmBKAQV1MStlhTatL0drqXdpeYBBjyQKL75IHeznZ8UU5lvCDP439haItyv_w3-QvV7uJVA</recordid><startdate>20170601</startdate><enddate>20170601</enddate><creator>Hollmann, E. 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L.</au><au>Shiraki, D.</au><au>Cooper, C.</au><au>Martin-Solis, J. R.</au><au>Parks, P. B.</au><au>Paz-Soldan, C.</au><aucorp>General Atomics, San Diego, CA (United States)</aucorp><aucorp>Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Study of Z scaling of runaway electron plateau final loss energy deposition into wall of DIII-D</atitle><jtitle>Physics of plasmas</jtitle><date>2017-06-01</date><risdate>2017</risdate><volume>24</volume><issue>6</issue><issn>1070-664X</issn><eissn>1089-7674</eissn><coden>PHPAEN</coden><abstract>Controlled runaway electron (RE) plateau-wall strikes with different initial impurity levels are used to study the effect of background plasma ion charge Z (resistivity) on RE-wall loss dynamics. It is found that Joule heating (magnetic to kinetic energy conversion) during the final loss does not go up monotonically with increasing Z but peaks at intermediate Z ∼ 6. Joule heating and overall time scales of the RE final loss are found to be reasonably well-described by a basic 0D coupled-circuit model, with only the loss time as a free parameter. This loss time is found to be fairly well correlated with the avalanche time, possibly suggesting that the RE final loss rate is limited by the avalanche rate. First attempts at measuring total energy deposition to the vessel walls by REs during the final loss are made. At higher plasma impurity levels Z > 5, energy deposition to the wall appears to be consistent with modeling, at least within the large uncertainties of the measurement. At low impurity levels Z < 5, however, local energy deposition appears around 5–20× less than expected, suggesting that the RE energy dissipation at low Z is not fully understood.</abstract><cop>Melville</cop><pub>American Institute of Physics</pub><doi>10.1063/1.4985086</doi><tpages>10</tpages><orcidid>https://orcid.org/0000-0001-5539-1297</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | 70 PLASMA PHYSICS AND FUSION TECHNOLOGY Avalanches Deposition Energy Energy conversion Energy dissipation Energy measurement Impurities Ion charge Kinetic energy Ohmic dissipation Plasma physics Resistance heating |
| title | Study of Z scaling of runaway electron plateau final loss energy deposition into wall of DIII-D |
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