Abstract
Tore Supra is equipped with two 20 μs fast sweep X-mo de reflectometers operating between 50-110 GHz dedicated to density profile determination and an X-mode fixed frequency reflectometer operating between 105-155 GHz for density fluctuation measurements. Heterodyne and sine-cosine detection provide measurements of the reflected signal with high sensitivity. Operating profile reflectometer in burst mode (5 μs dead time between two consecutive sweeps) allows quasi-simultaneous measurements at fixed frequency over a broad frequency band. Thus, information on plasma fluctuations, such as magnetohydrodynamic (MHD) activity, up to 20 kHz as well as a radial localization of the modes is accessible. The temporal evolution of the q= 1 rational surface during sawtooth crash activity has been recorded in the plasma center with high spatial resolution. In addition, a direct comparison between signals associated with a central MHD mode from both profile and fluctuation reflectometers, positioned at different toroidal angles, allows one to determine the plasma toroidal velocity.
| Original language | English |
|---|---|
| Pages (from-to) | 3825-3827 |
| Number of pages | 3 |
| Journal | Review of Scientific Instruments |
| Volume | 75 |
| Issue number | 10 II |
| DOIs | |
| Publication status | Published - 1 Oct 2004 |
| Externally published | Yes |