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 | 210: Effect of loop voltage fluctuations on the pedestal | ||
| Name: | Pete Politzer ( |
Affiliation: | General Atomics |
| Research Area: | ELM Control & Pedestal Physics | Presentation time: | Not requested | Co-Author(s): | -- |
| Description: | Determine whether and to what extent the loop voltage (both DC and fluctuating) affects the density pedestal shape. | ||
| Experimental Approach/Plan: | Use a well-documented H-mode pedestal discharge. Apply low-pass filtering to the E-coil command to gradually reduce control fluctuations of the loop voltage. Reduce the fluctuations to zero (strictly constant voltage). Look at changes in the pedestal shape, particularly density. | ||
| Background: | The r.m.s. fluctuation amplitude of the loop voltage at the plasma surface is large (> 10 V). The effect of this on the pedestal is unknown. These has been some indication in noninductive discharges that transformer clamping broadens the density pedestal. A systematic search for such an effect is called for. If an effect exists it may help elucidate the dynamics of the pedestal profile. | ||
| Resource Requirements: | -- | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
Print this page