DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2008 EXPERIMENTAL CAMPAIGN
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| Title | 382: Oblique-ECE-assisted MECCD suppression of NTMs | ||
| Name: | Francesco Volpe ( |
Affiliation: | ORAU |
| Research Area: | NTM Stabilization | Presentation time: | Requested | Co-Author(s): | M. Austin, R. La Haye, R. Prater |
| Description: | Use oblique ECE to check radial alignment of ECCD to island and determine the best frequency and phase of modulation for its suppression. | ||
| Experimental Approach/Plan: | Analyze two oblique ECE signals originating close to 2/1 or 3/2 target by software, within the PCS, and by hardware, by dedicated analogue electronics. PCS will determine the quality of the radial alignment and decide whether to move the plasma and/or the EC resonance, and by how much. The dedicated electronics will generate waveforms for the modulation of the gyrotrons and directly deliver them to their power supplies by means of optical isolators and fibres. The system was designed for 1-10kHz NTMs, but initially it would be preferable to stabilize a mode rotating more or less uniformly at 2-5kHz. This might require some scenario development. | ||
| Background: | All the hardware was assembled and individual parts were tested in April-June 2007. For example the oblique ECE radiometer was shown to work as far as absolute Te measurements are concerned, but measurements of the Te oscillations associated with a rotating NTM were not attempted yet. The electronics was also shown to correctly manipulate function-generated "fake" signals, and successfully modulated the gyrotrons at up to 5kHz. The experiment proposed here will be the first comprehensive test of the entire system on a real rotating island and the first ECCD stabilization experiment directly driven by oblique ECE emitted near the island, although similar experiments are under preparation at TEXTOR. | ||
| Resource Requirements: | -- | ||
| Diagnostic Requirements: | -- | ||
| Analysis Requirements: | -- | ||
| Other Requirements: | -- | ||
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