Penetration and linear absorption of lower hybrid waves in a tokamak plasma
Penetration and linear absorption of slow waves in a hot tokamak plasma is studied for waveguide coupling. For this coupling system, the emphasis is placed on the role of the plasma density profile facing the waveguides over the spectrum of the energy flux launched. This spectrum consists of three portions: a first portion is likely to be trapped in the outer part of the plasma and might be responsible for absolute parametric instability. A second portion penetrates deep into the plasma and may be absorbed by ions via ion-cyclotron or perpendicular Landau damping after being converted into short wavelength Bernstein-like modes. The remaining portion is generally absorbed by electrons via electron Landau damping before reaching the region of lower hybrid wave conversion.
- Research Organization:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- DOE Contract Number:
- E(11-1)-3073
- OSTI ID:
- 7238109
- Report Number(s):
- PPPL-1277; TRN: 77-003021
- Country of Publication:
- United States
- Language:
- English
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