This title appears in the Scientific Report :
2011
Please use the identifier:
http://dx.doi.org/10.1088/0029-5515/51/10/103030 in citations.
Integrated simulation of ELM triggered by pellet through energy absorption and transport enhancement
Integrated simulation of ELM triggered by pellet through energy absorption and transport enhancement
Two integrated core/scrape-off layer/divertor transport codes TOPICS-IB and JINTRAC with links to MHD stability codes are coupled with models of pellet injection to clarify effects of the pellet on the behaviour of edge-localized modes (ELMs). Both codes predict the following two triggering mechanis...
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Personal Name(s): | Hayashi, N. |
---|---|
Parail, V. / Koechl, F. / Aiba, N. / Takizuka, T. / Wiesen, S. / Lang, P.T. / Ozeki, T. | |
Contributing Institute: |
Plasmaphysik; IEK-4 |
Published in: | Nuclear fusion, 51 (2011) S. 103030 |
Imprint: |
Vienna
IAEA
2011
|
Physical Description: |
103030 |
DOI: |
10.1088/0029-5515/51/10/103030 |
Document Type: |
Journal Article |
Research Program: |
Fusion |
Series Title: |
Nuclear Fusion
51 |
Subject (ZB): | |
Publikationsportal JuSER |
Two integrated core/scrape-off layer/divertor transport codes TOPICS-IB and JINTRAC with links to MHD stability codes are coupled with models of pellet injection to clarify effects of the pellet on the behaviour of edge-localized modes (ELMs). Both codes predict the following two triggering mechanisms. Energy absorption by the pellet and its further displacement due to the E x B drift, as well as transport enhancement by the pellet, are found to be able to trigger the ELM. The ablated cloud of pellet absorbs the background plasma energy and causes a radial redistribution of pressure due to the subsequent E x B drift. Further, the sharp increase in local density and temperature gradients in the vicinity of ablated cloud causes the transient enhancement of heat and particle transport. Both mechanisms produce a region of increased pressure gradient in the background plasma profile within the pedestal, which triggers the ELM. The mechanisms have the potential to explain a wide range of experimental observations. |