DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 67: High Performance Operation With Te=Ti | ||
| Name: | C. Craig Petty ( |
Affiliation: | General Atomics |
| Research Area: | Core Integration (Steady-State Scenario) | Presentation time: | Not requested | Co-Author(s): | -- |
| Description: | Demonstrate high performance operation with Te=Ti to help establish the physics basis for AT operation in ITER. | ||
| Experimental Approach/Plan: | (1) Re-establish AT plasmas with qmin = 1.5 and beta_N > 3.5 using NBI. (2) Using NBI power feedback of the diamagnetic flux, inject as much ECH and FW power as possible in these plasmas. The ECH should be off-axis (rho=0.2-0.3) to prevent the electron temperature profile from becoming too peaked. Simulation works needs to be done before hand to determine whether current drive phasing is desirable. (3) Vary the inductive ramp up phase to vary the amount of NCS to determine the optimal safety factor profile for these plasmas. (4) Determine if early electron heating is better than applying the electron heating after the hot ion mode has formed. | ||
| Background: | In many if not most of the AT modes developed around the world, hot ion mode plasmas are used to suppress the linear growth rates of the turbulence (Burrell, IAEA, 1990). There have been some instances of strong ITB formation with Te=Ti, most notably in JT-60U, but strong ITB's usually lead to low beta limits and so this line of research has not been strongly pursued on DIII-D. This experiment proposes to utilize high beta AT plasmas with qmin=1.5, and replace as much NBI power with ECH and FW power as possible. Current drive phasing of the RF may be used if it leads to a desirable safety factor profile, but this is not the emphasis of this experiment. This proposal is related to ITPA Joint Experiment TP-3. | ||
| Resource Requirements: | NBI: At least 5 sources.
EC: Mimimum 5 gyrotrons. FW: Desired to couple >1 MW. | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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