Turbulence and transport during electron cyclotron heating in the DIII-D tokamak
The response of plasma parameters and broad wavenumber turbulence (1--40 cm{sup -1}, k{rho}{sub s} = 0.1--8) to auxiliary electron cyclotron heating (ECH) is reported on. In these plasmas the electron temperature responds most strongly to the ECH while the electron density and ion temperature are kept approximately constant. Thermal fluxes and diffusivities increase appreciably with ECH for both electron and ion channels. Significant changes to the density fluctuations over the full range of measured wavenumbers are observed. This range of wavenumbers encompasses that typically associated with ion temperature gradient, trapped electron mode, and electron temperature gradient modes. Changes in linear growth rates calculated using a gyrokinetic code show consistency with observed fluctuation increases over the whole range of wavenumbers.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 957602
- Report Number(s):
- UCRL-PROC-232219; TRN: US1005579
- Resource Relation:
- Conference: Presented at: 34th EPS Conference on Plasma Physics, Warsaw, Poland, Jul 02 - Jul 06, 2007
- Country of Publication:
- United States
- Language:
- English
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