DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2013 EXPERIMENTAL CAMPAIGN
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| Title | 10: Maintain low-rotation QH-mode with ECH only | ||
| Name: | Keith Burrell Burrell@fusion.gat.com | Affiliation: | General Atomics |
| Research Area: | Inductive Scenarios | Presentation time: | Not requested |
| Co-Author(s): | A. Garofalo, W.M. Solomon | ITPA Joint Experiment : | No |
| Description: | The goal of this work is to demonstrate that low-rotation QH-mode can be sustained with ECH, which provides plasma heating with no input torque. | ITER IO Urgent Research Task : | No |
| Experimental Approach/Plan: | The target plasma for this work will be the NRMF sustained QH-mode with net zero NBI torque which as been developed over the past several years. We will established the QH-mode using balanced neutral beam injection run up until about 3000 ms in the shot. At this point, we will switch from NBI to ECH to see if the plasma remains in QH-mode with the NRMF assist. | ||
| Background: | QH-mode is an extremely attractive operating mode for future devices, since it exhibits H-mode confinement combined with steady-state operation without ELMs. Work in the 2009-2012 campaigns on D III-D has demonstrated QH-mode operation with zero-net NBI torque or small co-Ip torque by replacing the NBI torque with torque from neoclassical toroidal viscosity produced using nonresonant n=3 magnetic fields. Although the net neutral beam torque was zero or slightly co-Ip for these shots, there were still small variations in the torque density profile as a function of radius owing to fast ion orbit effects. A demonstration that low rotation QH-mode could be sustained by ECH only would make clear that these residual radial variations were irrelevant. This plasma will have a shape and C and I-coil configuration optimized for minimum intrinsic torque and maximum counter-torque due to NRMF. | ||
| Resource Requirements: | Reverse Ip. 6-7 gyrotrons. C-coil configured for maximum n=3 field, 7 kA current. I-coil configured for error field correction and as much n=3 field as possible. | ||
| Diagnostic Requirements: | Standard profile and all fluctuation diagnostics, especially edge BES and ECE-I for EHO studies | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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