Distributions of magnetic field and current in pinching plasma flows: effect of axial magnetic field

Solyakov, D. G.; Volkova, Yu.Ye.; Ladygina, M. S.; Merenkova, T.M.; Marchenko, A. K.; Garkusha, I.E.; Petrov, Yu. V.; Chebotarev, V. V.; Makhlai, V.А.; Kulik, M. V.; Staltsov, V.V.; Yeliseyev, D.V.

doi:10.1140/epjp/s13360-021-01170-z

Cited by 4 publications

(16 citation statements)

References 8 publications

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“…The sets of concentric vortices and enclosed toroidal current structures have been observed in different regimes of the MPC operation. The spatial structures of the electric current in the case with no axial magnetic field contain current vortices near the axis, as opposed to the case with the magnetic field [3]. The current isolines are expelled or "pushed out" from the center of the plasma stream.…”

Section: Introductionmentioning

confidence: 98%

“…The plasma density in the compression zone can be up to 10 18 …10 19 cm -3 and temperature up to a few kiloelectronvolt. In previous experiments [2][3][4], plasma streams with a plasma density of 10 18 cm -3 and temperature of a hundred electronvolt were obtained.…”

Section: Introductionmentioning

confidence: 99%

“…This effect is associated with a formation of a compression zone in the region. The additional axial magnetic field affects the structure of the plasma flow ejected from the accelerator, although it is applied only inside the channel and its magnitude is negligible in the plasma volume measurements were conducted [3]. The imposed magnetic field might enhance the formation of the current-sheet-like structure during later stages of the MPC discharge, which has become a subject of study for the first time.…”

Section: Introductionmentioning

confidence: 99%

“…Considering the presence of the external magnetic field, this task becomes even more critical. Since the spectroscopic methods are not appropriate for local measurements, we apply a set of magnetic and double electric probes [3,4] to measure plasma parameters locally. Probes have proven to be reliable diagnostic tools among the contact methods used to measure plasma parameters with sufficiently high temporal and spatial resolution in various devices, including tokamaks and stellarators [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study of Current-Sheet-Like Structure in Pinching Plasma Flow With Electric and Magnetic Probes

Volkova¹,

Solyakov²,

Marchenko³

et al. 2022

Problems of Atomic Science and Technology

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The formation of the current-sheet-like structure under the influence of the external magnetic field in pinching plasma flows generated by the magnetoplasma compressor has been studied. A set of magnetic and electric probes were used to measure the self-generated magnetic field, electron temperature, and electric field locally with sufficiently high temporal and spatial resolution. The data obtained from the probe measurements were used to plot the spatial distributions of electric current and drift velocity in the plasma stream to identify the patterns of plasma flow. In the presence of external magnetic field, the current density, electron temperature, and the ion saturation current reach a peak in close proximity to the sheet. Measurements indicate the outflow of two electron jets of different temperatures from the layer.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental Study of Current-Sheet-Like Structure in Pinching Plasma Flow With Electric and Magnetic Probes

Volkova¹,

Solyakov²,

Marchenko³

et al. 2022

Problems of Atomic Science and Technology

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“…Matter in plasma form is chemically reactive with agents such as free radicals, excited species, and free electrons and is therefore used to increase the rate of chemical reactions [ 1 – 3 ]. Gliding arc (GA) discharge is a frequently used method for producing non-thermal plasma at atmospheric pressure [ 4 ]; applications have been in the production and enhancement of combustion [ 5 ], gas conversion [ 6 ], inactivation of fungi, viruses, and bacteria such as Covid-19 [ 7 ], processing and modification of surfaces [ 8 ] and de-contamination [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

An Empirical Study of Electrode Degradation in Gliding Arc Discharge

Ramezani

Yahaghi

Nohekhan

2022

Russ J Nondestruct Test

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Non-thermal plasma can be generated by gliding arc discharge units and is used in various applications including disinfection of the surface, inactivation of fungi, viruses, and bacteria. Degradation of the electrodes through prolonged use is common. It is caused by bombardment by plasma-charged particles causing changes to the structure and chemistry of its electrodes which in turn leads to a reduction in the efficiency of the plasma. In this study, the discharged plasma from a gliding arc unit was investigated using optical emission spectrometry (OES). Also studied were the electrodes of the unit after prolonged use. The structure and metallographic properties of the electrodes were evaluated using positron annihilation lifetime spectroscopy (PALS), X-ray diffraction analysis (XRD) and scanning electron microscopy—energy dispersive X-ray spectroscopy (SEM-EDX) and compared to data from new unused samples. The size of defects and holes were also compared using PALS. It was found that the intensity of species decreased significantly with prolonged use of the unit as the copper electrodes degraded. It was also found that the internal structure, as well as the surface of the used electrodes, had changed significantly compared to the unused samples, the radius of holes in the electrode material had decreased and the intensity of holes increased. Furthermore, the planes of the atomic structure of the copper electrode have moved closer. The approach developed in this study has been shown an effective non-destructive method for routine evaluation of the electrodes and maybe a development further for monitoring and quality assurance programs for maintaining high plasma efficiency as well as for research into improvements to electrode material design.

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Structure and local parameters of self-compressed plasma streams in external magnetic field

et al. 2023

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The influence of the external axial magnetic field on pinching plasma flows generated by a magnetoplasma compressor (MPC) has been studied using magnetic and electric probes. In the presence of an external magnetic field, temperature measurements show two groups of electrons with different temperatures near the plasma stream core. The external magnetic field leads to a noticeable increase in the electric current in the plasma stream, electron temperature, and the formation of the current-sheet-like structure observed in the MPC for the first time.

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Distributions of magnetic field and current in pinching plasma flows: effect of axial magnetic field

Cited by 4 publications

References 8 publications

Experimental Study of Current-Sheet-Like Structure in Pinching Plasma Flow With Electric and Magnetic Probes

Experimental Study of Current-Sheet-Like Structure in Pinching Plasma Flow With Electric and Magnetic Probes

An Empirical Study of Electrode Degradation in Gliding Arc Discharge

Structure and local parameters of self-compressed plasma streams in external magnetic field

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