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Short wavelength temperature gradient driven modes in tokamak plasmas.
A I Smolyakov1, M Yagi, Y Kishimoto
1Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, S7N5E2 Canada.
Physical Review Letters
|September 13, 2002
Summary
New unstable temperature gradient driven modes were identified in tokamak plasma. These short-wavelength instabilities arise from plasma responses deviating from the Boltzmann distribution.
Area of Science:
- Plasma Physics
- Fusion Energy Research
- Instability Theory
Background:
- Tokamak plasmas are complex systems where instabilities can affect confinement.
- Understanding plasma behavior at short wavelengths is crucial for fusion energy development.
- Temperature gradients are known drivers of plasma instabilities.
Purpose of the Study:
- To identify and characterize novel unstable temperature gradient driven modes in inhomogeneous tokamak plasmas.
- To investigate the behavior of these modes in the short wavelength regime (k(perpendicular)rho(i,e)>>1).
- To analyze the underlying plasma response responsible for these instabilities.
Main Methods:
- Theoretical analysis of plasma behavior in inhomogeneous magnetic fields.
- Investigation of plasma response functions in the short wavelength limit.
- Identification of conditions leading to mode destabilization.
Main Results:
- Discovery of new unstable temperature gradient driven modes (ion and electron).
- These modes are destabilized in the short wavelength regions where k(perpendicular)rho(i,e)>>1.
- The instability is linked to a plasma response that significantly deviates from the Boltzmann distribution.
Conclusions:
- The identified modes represent a new class of instabilities in tokamak plasmas.
- These findings highlight the importance of non-Boltzmannian plasma responses at short wavelengths.
- Further research is needed to assess the impact of these modes on tokamak performance.