DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 472: "Simple as possible" tests of TEM to ITG transitions | ||
| Name: | Edward Doyle ( |
Affiliation: | University of California, Los Angeles |
| Research Area: | Transport Model Validation | Presentation time: | Not requested | Co-Author(s): | Steve Scott, David Mikkelsen, Terry Rhodes |
| Description: | A density scan in ohmic plasmas is predicted to generate a transition from TEM to ITG turbulence, the appearance of the latter mode leading to the saturated ohmic confinement regime. The proposal here is to revisit this simple operating regime and document with the current (much improved) local diagnostic set, and compare with gyrokinetic code predictions. A key feature of this experiment is run with "simple" ohmic experimental conditions, well within the simulation capability of GYRO and other codes. | ||
| Experimental Approach/Plan: | Perform density scan in ohmic plasmas. Increase density until staurated confinement regime is obtained. Utilize short beam "blips" for diagnostic purposes. Compare measured turbulence characteristics to code predictions. | ||
| Background: | During the National Tomamak Planning Workshop there was widespread and strong support for returning to relatively simple plasmas, such as ohmic and L-mode for tests of transport models. While such comparisons have been performed before, the key point is that the capabilities of both turbulence diagnostics and gyrokinetic codes have been considerably enhanced, such that we can now perfrom better, more meaningful comparisons. | ||
| Resource Requirements: | All turbuelnce systems (BES, refelctometer, scattering, CECE). | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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