A tomography diagnostic in the visible spectrum to investigate turbulence and coherent modes in the linear plasma column Mistral

David, P.; Escarguel, A.; Camenen, Y.; Baude, Romain; Ferrand, Didier

doi:10.1063/1.4998017

Cited by 4 publications

(6 citation statements)

References 15 publications

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“…In this work, a visible spectro-tomographic diagnostic installed on the Mistral experiment is presented. It is an update of a previous tomographic setup [14,17]. In the present case 49 optical fibres, divided in two fans, collect the plasma emission and send it to an imaging spectrometer, giving a simultaneous access to the brightness of emission lines in the whole visible and the near IR argon spectrum.…”

Section: Discussionmentioning

confidence: 99%

“…In the present case 49 optical fibres, divided in two fans, collect the plasma emission and send it to an imaging spectrometer, giving a simultaneous access to the brightness of emission lines in the whole visible and the near IR argon spectrum. Specifically developed software operates the tomographic reconstruction [14,17], leading to 7 x 7 pixels plasma images, with 16 mm square pixels.…”

Section: Discussionmentioning

confidence: 99%

“…Two large windows, on the side and on the top of the linear chamber allow for an easy optical access of the plasma (shown as the tomography plane in Figure 1). 49 optical fibres (core diameter 200 µm) are positioned outside of the vacuum chamber, in front of these windows [14]. Each fibre facing the plasma is placed at the focal plane of a micro-lens (3.4 mm in diameter and 9.85 mm focal length), collimating the lines of sight.…”

Section: Methodsmentioning

confidence: 99%

“…The tomographic diagnostic has been explained in detail and validated in previous works [14,17], so only the most important features will be referenced here. The numerical tomographic inversion is based on a finite-element scheme.…”

Section: Tomographic Inversionmentioning

confidence: 99%

“…Experimental fluctuations of the intensity of the JAZ spectrometer have been found to be equal to 10%. In the case of spectro-tomography, the error bar has been considered as the one due to the tomography inversion [14]. The horizontal error bars represent the size of a pixel.…”

Section:  Validation Of the Spectro-tomography Techniquementioning

confidence: 99%

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Spatially resolved determination of the electronic density and temperature by a visible spectro-tomography diagnostic in a linear magnetized plasma

Gonzalez-Fernandez

David

Baude³

et al. 2020

Sci Rep

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In this work, a non-intrusive, spatially resolved, spectro-tomographic optical diagnostic of the electronic density and temperature on the linear plasma column Mistral is presented. Coupling of spectroscopy and tomography technique gives access to the local plasma light emission at different wavelengths (visible and near IR) in an argon plasma. Taking advantage of the symmetry of the Mistral experiment, the diagnostic results are validated and the plasma is found to correspond to a corona equilibrium state. With the use of another spectrometer and a Langmuir probe, we propose a non-intrusive method to determine the electronic density and temperature of each pixel of the tomographic images of the plasma. The obtained results are in good agreement with the Langmuir probe ones.Spectro-tomography combines the advantage of these two approaches to simultaneously offer spatial and spectral resolution. This method provides 2D maps of light intensities at different wavelengths [12], giving access to the plasma electronic density and temperature.The experimental set-up and the tomographic method are presented in section 2 and 3, respectively. The experimental results are detailed in section 4 with 3 sub-sections: Experimental confirmation of the corona equilibrium in Mistral,  Validation of the spectro-tomographic results,

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Tomographic Inversionmentioning

confidence: 99%

Section:  Validation Of the Spectro-tomography Techniquementioning

confidence: 99%

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Spatially resolved determination of the electronic density and temperature by a visible spectro-tomography diagnostic in a linear magnetized plasma

Gonzalez-Fernandez

David

Baude³

et al. 2020

Sci Rep

Self Cite

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Formation of spiral structures of turbulence driven by a strong rotation in magnetically cylindrical plasmas

et al. 2019

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A three-dimensional turbulence simulation is performed in order to understand the role of spiral structures observed in Kelvin-Helmholtz turbulence. The simulation is performed by introducing a vorticity source to drive the plasma rotation. By scanning the intensity of the vorticity source, a quasi-periodic formation of a spiral structure is obtained above a certain source intensity. The quasi-periodic oscillation can be seen in the fluctuation energy and the background, which exhibits a limit cycle oscillation. We clarify the roles of the spiral formation in the limit cycle oscillation: The dynamical change in the radial variation of the phase of the fluctuations causes a strong coupling of the fluctuations with the background through the transport of particles and momentum. The formation mechanism of the spiral structure is also studied. An instability due to the combination of the cylindrical effect and the flow inhomogeneity is consistent with the fluctuation which drives the spiral structure obtained in the simulation.

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Modal polarization analysis using Fourier-rectangular function transform in a cylindrical plasma

Nishimura

Fujisawa

Nagashima

et al. 2021

Journal of Applied Physics

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Fourier-rectangular function (FRF) transform [K. Yamasaki et al., J. Appl. Phys. 126, 043304 (2019)] is used to analyze the structure and dynamics of plasma with cylindrical symmetry. In this article, a new technique based on FRF transform is proposed to elucidate the polarization characteristics of azimuthal modes and fluctuations. The application results are shown for a two-dimensional tomography image of linear cylindrical plasma. The method successfully resolves the polarization characteristics of azimuthal modes and attributes the intermittent behavior of the m=1 mode to its polarization characteristics.

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A tomography diagnostic in the visible spectrum to investigate turbulence and coherent modes in the linear plasma column Mistral

Cited by 4 publications

References 15 publications

Spatially resolved determination of the electronic density and temperature by a visible spectro-tomography diagnostic in a linear magnetized plasma

Spatially resolved determination of the electronic density and temperature by a visible spectro-tomography diagnostic in a linear magnetized plasma

Formation of spiral structures of turbulence driven by a strong rotation in magnetically cylindrical plasmas

Modal polarization analysis using Fourier-rectangular function transform in a cylindrical plasma

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