DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 148: electron transport in sawteeth | ||
| Name: | Ed Lazarus ( |
Affiliation: | Oak Ridge National Laboratory |
| Research Area: | Transport | Presentation time: | Not requested | Co-Author(s): | Doyle, Rhodes, McKee, Luce |
| Description: | observe differences in fluctuation spectra seen in bean and oval sawteeth | ||
| Experimental Approach/Plan: | create plasmas we have run before
get reflectrometry, BES, doppler data add short pulses of central ECH and look for enhancement of fluctuations | ||
| Background: | In previous work we have discovered that we can create very large
changes in electron energy transport inside the sawtooth inversion radius by changing the plasma shape. The differentiationn is perhaps the maximum possible. In the bean shape in that the electron thermal diffusivity is in agreement with Callen's paleoclassical calculation, postulated to be the minimum possible. However in the oval, the electron thermal diffusivity inside the sawtooth inversion radius is infinite: it is not possible to create a local gradienet in eletron temperature. Lest this be interpreted as some poor quality plasma dominated by MHD activity, we point out that the ion confinement is excellent; approximately neoclassical. In such a situation it would be advantageous to search for fluctuations that correlate with these extreme differences in electron transport. | ||
| Resource Requirements: | No unusual resources required.
A single gyrotron, possibly two. | ||
| Diagnostic Requirements: | all fluctuation diagnostics. The usual complement
of plasma diagnostics will be employed. | ||
| Analysis Requirements: | No abnormal requirements. | ||
| Other Requirements: | -- | ||
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