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Impact of nearly-saturated divertor plates on particle control in long and high-power-heated discharges of JT-60U
| Content Provider | Semantic Scholar |
|---|---|
| Author | Nakano, Tomonori Asakura, Norimitsu Takenaga, Hiroshi Kubo, H. Miura, Yukitoshi Konoshima, Shigeru Masaki, Kei |
| Copyright Year | 2004 |
| Abstract | Modification for long pulse operation up to 65 s with a neutral beam heating power of 12 MW ( 30 s ) has provided an opportunity for studies on plasma-wall-interaction with a time scale of several tens second. During long pulse ELMy H-mode discharges, the net number of particles absorbed by the divertor plates and the first wall gradually decreases, and subsequently, becomes zero. This situation is interpreted as ’wall saturation’. Under the condition of the wall saturation, the plasma density continues to increase. This is considered to be one of the reasons why high performance plasmas are sustained for only limited time period. Due also to the rise of the plasma density, the divertor plasma detaches in wide region, and evolves into an X-point MARFE. Results from calculation of a 2-Dimensional plasma transport code indicates that higher divertor-pumping efficiency by a factor of 2-3 is required to avoid the X-point MARFE. Noted that no negative effects on impurity behavior such as carbon bloom, nor significant dilution of the core plasma has been observed even when total input energy reaches 350 MJ. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www-naweb.iaea.org/napc/physics/FEC/FEC2004/papers/ex_10-3.pdf |
| Alternate Webpage(s) | https://www-pub.iaea.org/mtcd/meetings/PDFplus/fusion-20-preprints/EX_10-3.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
