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A correlation electron cyclotron emission diagnostic and the importance of multifield fluctuation measurements for testing nonlinear gyrokinetic turbulence simulations

Rev. Sci. Instrum. 79, 103505 (2008); doi:10.1063/1.2981186

Published 28 October 2008

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A. E. White,1 L. Schmitz,1 W. A. Peebles,1 T. A. Carter,1 T. L. Rhodes,1 E. J. Doyle,1 P. A. Gourdain,1 J. C. Hillesheim,1 G. Wang,1 C. Holland,2 G. R. Tynan,2 M. E. Austin,3 G. R. McKee,4 M. W. Shafer,4 K. H. Burrell,5 J. Candy,5 J. C. DeBoo,5 R. Prater,5 G. M. Staebler,5 R. E. Waltz,5 and M. A. Makowski6
1University of California-Los Angeles, Los Angeles, California 90095, USA
2University of California-San Diego, 9500 Gilman Dr, La Jolla, California 92093, USA
3University of Texas-Austin, Austin, Texas 78712, USA
4University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
5General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA
6Lawrence Livermore National Laboratory, 3000 East Ave., Livermore, California 94550, USA
A correlation electron cyclotron emission (CECE) diagnostic has been used to measure local, turbulent fluctuations of the electron temperature in the core of DIII-D plasmas. This paper describes the hardware and testing of the CECE diagnostic and highlights the importance of measurements of multifield fluctuation profiles for the testing and validation of nonlinear gyrokinetic codes. The process of testing and validating such codes is critical for extrapolation to next-step fusion devices. For the first time, the radial profiles of electron temperature and density fluctuations are compared to nonlinear gyrokinetic simulations. The CECE diagnostic at DIII-D uses correlation radiometry to measure the rms amplitude and spectrum of the electron temperature fluctuations. Gaussian optics are used to produce a poloidal spot size with wo~1.75  cm in the plasma. The intermediate frequency filters and the natural linewidth of the EC emission determine the radial resolution of the CECE diagnostic, which can be less than 1 cm. Wavenumbers resolved by the CECE diagnostic are ktheta<=1.8  cm−1 and kr<=4  cm−1, relevant for studies of long-wavelength turbulence associated with the trapped electron mode and the ion temperature gradient mode. In neutral beam heated L-mode plasmas, core electron temperature fluctuations in the region 0.5<r/a<0.9, increase with radius from ~0.5% to ~2%, similar to density fluctuations that are measured simultaneously with beam emission spectroscopy. After incorporating “synthetic diagnostics” to effectively filter the code output, the simulations reproduce the characteristics of the turbulence and transport at one radial location r/a=0.5, but not at a second location, r/a=0.75. These results illustrate that measurements of the profiles of multiple fluctuating fields can provide a significant constraint on the turbulence models employed by the code. ©2008 American Institute of Physics
History: Received 30 June 2008; accepted 19 August 2008; published 28 October 2008
Permalink: http://link.aip.org/link/?RSINAK/79/103505/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.70.Nc
    Particle plasma diagnostic measurements
  • 52.50.Qt
    Plasma heating by radio-frequency fields
  • 52.35.Ra
    Plasma turbulence
  • 52.25.Gj
    Plasma fluctuation and chaos phenomena
  • 52.25.Fi
    Plasma transport properties
  • 52.25.Tx
    Emission, absorption, and scattering of particles in plasma
  • YEAR: 2008

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PUBLICATION DATA

ISSN:
0034-6748 (print)   1089-7623 (online)
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