| Autor: |
DeGrandchamp GH; University of California Irvine, Irvine, California 92697, USA., Thome KE; General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA., Heidbrink WW; University of California Irvine, Irvine, California 92697, USA., Holmes I; General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA., Pinsker RI; General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA. |
| Abstrakt: |
The ion cyclotron emission diagnostic on the DIII-D tokamak comprises seven single-turn loops that measure high-frequency (1-100 MHz) magnetic field fluctuations that are often excited by energetic particles in the plasma. The raw voltage signals induced in the loops in response to these fluctuations travel through a series of cables, isolation transformer DC blocks, low-pass filters, and finally a digitizer before being analyzed in frequency space. The diagnostic has been recently upgraded, most notably to include four additional graphite tile loops and a new eight-channel digitizer. The previous three loops are all on the low-field side of the tokamak. The measurement capabilities of the system have been expanded by the addition of a new horizontally oriented loop on the low-field side, an additional toroidal loop on the low-field side, and two toroidal loops on the high-field side. These loops will be used to provide approximate mode polarization, improved toroidal mode number calculations, and information on modes in inward-shifted plasmas, respectively. |
