Evaluation of spectral broadening due to an extended non-uniform scattering region in microwave scattering experiments

Nagatsu, Masaaki; Tsukishima, Takashige

doi:10.1088/0029-5515/27/6/011

Cited by 3 publications

(1 citation statement)

References 17 publications

(29 reference statements)

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“…Taking this into account, theoretical analyses and numerical evaluations of the power spectral distributions have been performed using the present experimental parameters; the results of these investigations are described in Ref. [20]. Good agreement between the observed spectra and the numerically evaluated spectra has been obtained.…”

Section: Density Fluctuations In Jipp T-iiumentioning

confidence: 82%

Observation of asymmetric power spectra of density fluctuations in the JIPP T-IIU plasma by far-infrared laser scattering

et al. 1987

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Asymmetric power spectra of the density fluctuations in the JIPP T-IIU plasma have been observed by submillimetre wave scattering using a newly developed dual homodyne detection system. A linear dispersion relation between the frequency at the peak of the broad spectra of the density fluctuations and the poloidal wave number k e has been obtained. The observed frequencies are about three times higher than the theoretical values for electron diamagnetic drift waves. It is shown that this discrepancy can be accounted for quantitatively by the Doppler effect due to the 2 X B fluid rotation of the plasma. Low frequency line spectra are also observed, exclusively for low k e ; they are identified with MHD waves. Finally, it is pointed out that the extended scattering region could have significant effects on the apparent spectral distribution of the density fluctuations.

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Section: Density Fluctuations In Jipp T-iiumentioning

confidence: 82%

Observation of asymmetric power spectra of density fluctuations in the JIPP T-IIU plasma by far-infrared laser scattering

et al. 1987

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Diagnostic instrumentation for microturbulence in tokamaks

Bretz

1997

Review of Scientific Instruments

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Particle and energy transport in tokamaks and other toroidal confinement devices is dominated by turbulence generated by flows and gradients. In order to understand and control of this transport, diagnostic instrumentation was developed to study the structure and magnitude of microturbulent processes and to identify the origins of plasma loss. This review will cover the primary instruments that have been developed to measure fluctuating quantities associated with transport: density, δn, temperature, δT, potential, δφ, and magnetic field, δB, and their correlations. The methods discussed are Langmuir probes, heavy ion beam probes, collective and phase scintillation scattering, beam emission and ordinary spectroscopy, reflectometry and enhanced scattering, electron cyclotron emission, and several magnetic methods. The emphasis here will be on techniques applicable to microturbulence whose scale length is greater than the ion cyclotron radius and much less than the minor radius. Limitations and strengths of each method will be described and compared. Techniques will be discussed for estimating fluctuation intensities and wave number spectra or, equivalently, multipoint correlations in radial, poloidal, and toroidal directions. Large scale or magnetohydrodynamic-like plasma oscillations are typically studied with tomographic techniques or external probes and are reviewed elsewhere.

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A study of low-frequency microturbulence by CO2-laser collective scattering in the FT-2 tokamak

Bulanin¹,

Vers²,

Esipov

et al. 2001

Plasma Phys. Rep.

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Evaluation of spectral broadening due to an extended non-uniform scattering region in microwave scattering experiments

Cited by 3 publications

References 17 publications

Observation of asymmetric power spectra of density fluctuations in the JIPP T-IIU plasma by far-infrared laser scattering

Observation of asymmetric power spectra of density fluctuations in the JIPP T-IIU plasma by far-infrared laser scattering

Diagnostic instrumentation for microturbulence in tokamaks

A study of low-frequency microturbulence by CO2-laser collective scattering in the FT-2 tokamak

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