DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2013 EXPERIMENTAL CAMPAIGN
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| Title | 246: Develop low-torque, high normalized fusion performance QH-mode for ITER baseline scenario | ||
| Name: | Andrea Garofalo garofalo@fusion.gat.com | Affiliation: | General Atomics |
| Research Area: | Inductive Scenarios | Presentation time: | Not requested |
| Co-Author(s): | K. Burrell, W. Solomon, M. Fenstermacher | ITPA Joint Experiment : | No |
| Description: | Demonstrate QH-mode operation at ITER-relevant torque, ITER-similar shape, and G>0.4 (betan>2.0, H89>2.0, q95<3.3) | ITER IO Urgent Research Task : | No |
| Experimental Approach/Plan: | Re-create discharges such as 149220 (reversed Ip) with normal-Ip operation.
Modify the short Bt ramp down in 149220 to reach q95~3.2. Dynamic EFC may be necessary at this low q95 value, to correct possible n=1 error field introduced by a large amplitude n=3 C-coil field. | ||
| Background: | Reversed Ip experiemnt of June 19, 2012 (Miniproposal No. 2012-93-2).
D1 power supply was connected to the C-coils, which gave us 7.1 kA current capability in those coils. Using the C-coil with that current to produce an n=3 nonaxisymmetric magnetic field, we were able to create stationary counter-rotating QH-mode operation with co-Ip torque of +1 Nm for about 2 seconds, limited only by hardware constraints. These shots had excellent confinement with H98y2=1.3. Normalized fusion performance parameter is sustained at G=0.2 with q95~4.7, which projects to G=0.4 with q95 =3.3. In this experiment, we used a PCS controlled, brief toroidal field ramp in order to suppresses the n=1 EHO. The Bt is held constant once the n=1 EHO disappears. | ||
| Resource Requirements: | -- | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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