DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 406: Comparative study of RWM Excitation in low rotation plasmas on JT60U and DIII-D | ||
| Name: | Michio Okabayashi ( |
Affiliation: | Princeton Plasma Physics Laboratory |
| Research Area: | RWM Physics | Presentation time: | Not requested | Co-Author(s): | Go Matsunaga, M. Takechi (JAEA) and DIIID RWM group |
| Description: | DIIID and JT60U have reported that the RWM critical rotation behaves in a similar manner with the low rotation plasmas (Phys. Rev. Lett. 98, 055002 (2007) / 055001 (2007). However, the RWM, the consequence of external kinks excitation interacted with the resistive wall, could behave differently depending upon the details of the plasma boundary condition as well as the resistive wall geometry. Here, it is proposed to carry out a series of comparative studies to generalize the experimental results. This should be extremely useful for designing future devices. | ||
| Experimental Approach/Plan: | Subjects for comparative studies are:
(1) RWM seeds, and the amplitude evolvement in time ( growth rate) (2) RWM onset relative to the tearing modes onset (3) the mode structure measurement: radial profiles by the soft x-ray arrays and poloidal mode structure by poloidal mirnov signals (4) n=1residual mode activity above no-wall limit (5) possibility of higher n RFA Experiments The plasma conditions will be similar to the conditions reported previously in these PRLs. Some of data are already available from the previous shots. Diagnostics essential for RWM documentation have be improved in coming experiments on both devices. In particular, soft x-ray arrays both in devices will be ready for the detailed mode structure analysis. These experiments will provide information useful for designing future device, like ITER. | ||
| Background: | -- | ||
| Resource Requirements: | -- | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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