Acoustic instabilities and plasma heating resulting from energetic ion beam injection
Abstract
Electrostatic instabilities excited by an energetic ion beam are examined as a possible plasma heating mechanism. The dielectric properties of electrostatic waves in a uniform magnetized plasma are studied for a warm ion beam propagating at an arbitrary angle with respect to the magnetic field. The instability threshold and growth rate are calculated for the resonant ion-beam and ion- acoustic modes. The quasi-linear moment equations are used to follow the self-consistent evolution of the macroscopic plasma properties. A comparison is made with the collisional slowing-down rate of the beam. For the fastest growing modes it is found that the quasi-linear slowing-down time is significantly shorter than the coffisional slowing-down time.
- Publication:
-
Journal of Plasma Physics
- Pub Date:
- April 1979
- DOI:
- 10.1017/S0022377800021772
- Bibcode:
- 1979JPlPh..21..193D
- Keywords:
-
- Acoustic Instability;
- Collisional Plasmas;
- Energetic Particles;
- Ion Beams;
- Ion Injection;
- Plasma Heating;
- Dielectric Properties;
- Electrostatic Waves;
- Ion Acoustic Waves;
- Kinetic Energy;
- Landau Damping;
- Threshold Currents;
- Two Dimensional Flow;
- Wave Propagation;
- Plasma Physics