A theory of the coherent fundamental plasma emission in Tokamaks
Abstract
A theoretical model of coherent radiation near the fundamental plasma frequency of Tokamaks is proposed. It is shown that, in the presence of runaway electrons, the beam-generated Langmuir waves (L) can be parametrically converted into electromagnetic waves (T) through ponderomotive coupling to ion acoustic waves (S). Two types of pumps are considered: traveling wave pump and standing wave pump. Expressions are derived for the excitation conditions and the growth rates of electromagnetic decay instabilities (L yields T + S), electromagnetic fusion instabilities (L + S yields T) and electromagnetic oscillating two-stream instabilities (L yields S +/- S*, where S* is a purely growing mode).
- Publication:
-
Presented at the Energy Independence Conference: Fusion Energy and Plasma Physics
- Pub Date:
- July 1987
- Bibcode:
- 1987eic..confQ..17A
- Keywords:
-
- Coherent Radiation;
- Electron Plasma;
- Frequencies;
- Nonlinearity;
- Tokamak Devices;
- Wave Propagation;
- Electromagnetic Radiation;
- Ion Acoustic Waves;
- Ponderomotive Forces;
- Standing Waves;
- Traveling Waves;
- Plasma Physics