Drift waves control using emissive cathodes in the laboratory
Abstract
Low frequency plasma fluctuations are known to be the cause of strong transport perpendicular to magnetic guiding field line. These low frequency drift waves have been studied in linear devices in the laboratory over the last two decades. Their excitation or mitigation have been addressed using different drives, such as ring biasing or electromagnetic low frequency fields. Here we present an experimental characterization of the behavior of drift waves when the profile of the background plasma rotation is controlled using hot emissive cathodes. We show that electron emission from the cathodes modify the plasma potential, which in turn controls the rotation profile. Mitigation or enhancement of drift waves (on the amplitude or azimuthal mode number) is observed depending on the plasma rotation profile.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2017
- Bibcode:
- 2017AGUFMNG14A..02P
- Keywords:
-
- 3379 Turbulence;
- ATMOSPHERIC PROCESSES;
- 4455 Nonlinear waves;
- shock waves;
- solitons;
- NONLINEAR GEOPHYSICS;
- 4544 Internal and inertial waves;
- OCEANOGRAPHY: PHYSICAL;
- 7526 Magnetic reconnection;
- SOLAR PHYSICS;
- ASTROPHYSICS;
- AND ASTRONOMY