Characterisation of coherent rotating modes in a magnetised plasma column using a mono-sensor tomography diagnostic

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

doi:10.1063/1.4964905

Cited by 7 publications

(13 citation statements)

References 23 publications

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“…It was observed that by modifying the source potential, the mode could be transitioned from an m=2, to m=1 to a purely turbulent spectrum 14 . The low mode number structures were correlated strongly with anomalous transport 15 , and tomography measurements showed that the structure roughly retained its shape throughout rotation 16 . Further work has been carried out within a Penning discharge at the Princeton Plasma Physics Laboratory (PPPL).…”

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confidence: 87%

“…The preferential diffusion of the weakly magnetized ions results in a radial ambipolar field and therefore ExB drifts in the azimuthal direction. The Penning discharge has similar plasma parameters, electric and magnetic fields as the near-anode region of a Hall thruster, where a spoke-like coherent structure is commonly observed 12,13,14,15,16 . Penning discharges provide more convenient access for diagnostics than Hall thrusters do, and the physics is somewhat simplified by the lack of a magnetic field gradient, eliminating one energy source able to drive instabilities 17 .…”

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confidence: 99%

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Particle-in-cell simulations of anomalous transport in a Penning discharge

et al. 2018

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Electrostatic particle-in-cell simulations of a Penning discharge are performed in order to investigate azimuthally asymmetric, spoke-like structures previously observed in experiments. Two-dimensional simulations show that for Penning-discharge conditions, a persistent nonlinear spoke-like structure forms readily and rotates in the direction of ExB and electron diamagnetic drifts. The azimuthal velocity is within about a factor of two of the ion acoustic speed. The spoke frequency follows the experimentally observed scaling with ion mass, which indicates the importance of ion inertia in spoke formation. The spoke provides enhanced (anomalous) radial electron transport, and the effective cross-field conductivity is several times larger than the classical (collisional) value. The level of anomalous current obtained in the simulations is in good agreement with the experimental data. The rotating spoke channels most of the radial current, observable by an edge probe as short pulses.

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confidence: 87%

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confidence: 99%

Particle-in-cell simulations of anomalous transport in a Penning discharge

et al. 2018

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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%

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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“…1 is used for the fundamental study of transport in cold plasmas (T e ∼ 3 eV and T i ∼ 300 K). [2][3][4][5][6][7] . An Argon plasma is created by a thermoionic discharge, with a typical pressure P ≃ 10 −2 Pa and electron density n e ≃ 10 −15 m −3 .…”

Section: Introductionmentioning

confidence: 99%

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

David

Escarguel

Camenen

et al. 2017

Review of Scientific Instruments

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In this paper, we describe a newly installed tomography diagnostic on the linear magnetized plasma device Mistral. The diagnostic is composed of 128 lines of sight covering a 20 cm diameter section and an acquisition rate up to 1 MHz. The measurements are done in the visible spectrum using silicon photomultiplier arrays that require a lower amplification voltage than photomultiplier tubes for similar gains and have a fast response. Tomographic reconstruction of a rotating plasma mode is shown to illustrate the capabilities of the diagnostic.

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Characterisation of coherent rotating modes in a magnetised plasma column using a mono-sensor tomography diagnostic

Cited by 7 publications

References 23 publications

Particle-in-cell simulations of anomalous transport in a Penning discharge

Particle-in-cell simulations of anomalous transport in a Penning discharge

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

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

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