Fast-Ion Dynamics in the TEXTOR Tokamak Measured by Collective Thomson Scattering
Abstract
Here we present the first measurements by collective Thomson scattering of the evolution of fast-ion populations in a magnetically confined fusion plasma. 150 kW and 110 Ghz radiation from a gyrotron were scattered in the TEXTOR tokamak plasma with energetic ions generated by neutral beam injection and ion cyclotron resonance heating. The temporal behavior of the spatially resolved fast-ion velocity distribution is inferred from the received scattered radiation. The fast-ion dynamics at sawteeth and the slowdown after switch off of auxiliary heating is resolved in time. The latter is shown to be in close agreement with modeling results.
- Publication:
-
Physical Review Letters
- Pub Date:
- November 2006
- DOI:
- 10.1103/PhysRevLett.97.205005
- Bibcode:
- 2006PhRvL..97t5005B
- Keywords:
-
- 52.25.Os;
- 52.40.Db;
- 52.50.Gj;
- 52.70.Gw;
- Emission absorption and scattering of electromagnetic radiation;
- Electromagnetic radiation interactions with plasma;
- Plasma heating by particle beams;
- Radio-frequency and microwave measurements