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Particle Control under Wall Saturation in Long-pulse High-density H-mode Plasmas of JT-60U
| Content Provider | Semantic Scholar |
|---|---|
| Author | Kubo, H. Nakano, Takeo Asakura, Nobuyuki Takenaga, Hiroshi Tsuzuki, Keita Oyama, Naoyuki Kawashima, Hisato Shimizu, Keigo Urano, Hajime Fujimoto, Kohji |
| Copyright Year | 2006 |
| Abstract | Long-pulse high-density H-mode plasmas have been sustained by divertor pumping under global wall saturation. The energy confinement and ELM activity can be sustained, while wall pumping does not work and even outgas appears. The outgas is attributed to increase in the divertor-plate temperature. On the other hand, wall pumping continues for longer than 20 s in high-density (ne ~ 0.8 nGW) discharges with an X-point MARFE and detached divertor plasma. The X-point MARFE has also been controlled by the divertor pumping. As a result, the electron density control by the divertor pumping and the gas puffing is effective under the wall saturation. However, it should be noted that the wall-pumping rate changes to maintain the electron density against the control. The change in the wall pumping suggests dynamic equilibrium between particle flux and desorption as an important wall-pumping mechanism. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www-naweb.iaea.org/napc/physics/fec/fec2006/papers/ex_p4-11.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
