DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
Login | Review | Submit | Logout | Help
Questions about this website? Contact Andrew LeBlanc Questions about ROF? Contact Chuck Greenfield
| Title | 433: ELM pacing and suppression by "plasma wobbling" 'a la TCV | ||
| Name: | Francesco Volpe ( |
Affiliation: | ORAU |
| Research Area: | ELM Control & Pedestal Physics | Presentation time: | Requested | Co-Author(s): | -- |
| Description: | Use controlled vertical oscillations of the plasma to make it temporarily ELM-free, and fast oscillations for ELM-pacing. | ||
| Experimental Approach/Plan: | Starting with a DND H-mode, pre-program in the PCS vertical oscillations by +-1cm, initially with a period of 500ms. This should result in alternate ELM-ing and ELM-free periods. Then try faster oscillations. When the period becomes comparable with or faster than the "natural" inter-ELM period, ELM pacing should be obtained. | ||
| Background: | TCV has shown that controlled vertical oscillations of the plasma, sometimes referred to as "wobbling", can cause controlled transitions between ELM-ing and ELM-free H-modes [M.J.Dutch et al., Nucl.Fusion 1995] and even pace ELMs [A.W. Degeling et al., PPCF 2003]. Although not fully understood, the current interpretation is that the wobbling modulates the magnetic flux, thus inducing currents, predominantly in the edge.
DIII-D is intermediate between TCV and ITER both in size and with respect to the flexibility of vertical positioning. Therefore, it is a good test bed to check the exportability of this technique to ITER. | ||
| Resource Requirements: | -- | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
Print this page