Density Fluctuation Measurement by Far Infrared Light Scattering

Grésillon, D.; Stern, Catalina; Hémon, A; Truc, A.; Lehner, Thierry; Olivain, J.; Quéméneur, A.; Gervais, F.; Lapierre, Y

doi:10.1088/0031-8949/1982/t2b/024

Cited by 29 publications

(17 citation statements)

References 9 publications

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“…If there is no crosspower phase delay (∆ t = 0) but still a crosspower amplitude above noise level, this means that the structure overlaps both volumes [19].…”

Section: Crosspowermentioning

confidence: 99%

Study of intermittent small-scale turbulence in Wendelstein 7-AS plasmas during controlled confinement transitions

Basse

Zoletnik²,

Michelsen³

et al. 2005

Physics of Plasmas

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“…If there is no crosspower phase delay (∆ t = 0) but still a crosspower amplitude above noise level, this means that the structure overlaps both volumes [19].…”

Section: Crosspowermentioning

confidence: 99%

Study of intermittent small-scale turbulence in Wendelstein 7-AS plasmas during controlled confinement transitions

Basse

Zoletnik²,

Michelsen³

et al. 2005

Physics of Plasmas

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“…Broad frequency peaks associated with the scattered signal are visible around ±1 MHz. Additional spectra [(i) detector closed and (ii) no plasma, local oscillator and primary beams present] are also used to calculate a frequency spectrum which gives an absolute measure of the amplitude of the scattered signal [11]. This spectrum is scaled against several experiment parameters including the laser power, beam waist, and detector efficiency, and is referred to as the dynamic form factor S(k,oo) (units of s~').…”

mentioning

confidence: 99%

Modulated Electron Cyclotron Drift Instability in a High-Power Pulsed Magnetron Discharge

Tsikata

Minea

2015

Phys. Rev. Lett.

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The electron cyclotron drift instability, implicated in electron heating and anomalous transport, is detected in the plasma of a planar magnetron. Electron density fluctuations associated with the mode are identified via an adapted coherent Thomson scattering diagnostic, under direct current and high-power pulsed magnetron operation. Time-resolved analysis of the mode amplitude reveals that the instability, found at MHz frequencies and millimeter scales, also exhibits a kHz-scale modulation consistent with the observation of larger-scale plasma density nonuniformities, such as the rotating spoke. Sharply collimated axial fluctuations observed at the magnetron axis are consistent with the presence of escaping electrons in a region where the magnetic and electric fields are antiparallel. These results distinguish aspects of magnetron physics from other plasma sources of similar geometry, such as the Hall thruster, and broaden the scope of instabilities which may be considered to dictate magnetron plasma features.

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“…The normalized signal is converted to a physical quantity, the dynamic form factor S( k, ω) [8] in units of seconds, using the plasma and laser beam characteristics…”

Section: Signal Normalization and Treatmentmentioning

confidence: 99%

Collective Light Scattering for the Study of Fluctuations in Magnetized Plasmas: The Hall Thruster Case Study

Tsikata

Honoré

Grésilon

et al. 2011

Contrib. Plasma Phys.

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International audienceCollective light scattering (CLS) has been recently extended to the observation of Hall effect thruster plasmas. A better understanding of the physics of Hall thrusters is key to improving thruster operation and lifetimes. In particular, the origins of thruster phenomena such as anomalous electron transport need to be determined. A high-performance CLS diagnostic has therefore been developed for identifying and measuring electron density fluctuations in the thruster, at millimetric length scales and MHz frequencies. Such modes are believed to play a role in anomalous transport, and experiments so far performed have provided information on their dispersion relations, amplitude and directivity. This work describes the technical aspects of the optical bench and the range of accessible experiments (© 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

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Density Fluctuation Measurement by Far Infrared Light Scattering

Cited by 29 publications

References 9 publications

Study of intermittent small-scale turbulence in Wendelstein 7-AS plasmas during controlled confinement transitions

Study of intermittent small-scale turbulence in Wendelstein 7-AS plasmas during controlled confinement transitions

Modulated Electron Cyclotron Drift Instability in a High-Power Pulsed Magnetron Discharge

Collective Light Scattering for the Study of Fluctuations in Magnetized Plasmas: The Hall Thruster Case Study

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