Parameters of Hydrogen Plasma Streams in Qspa-M  and Their Dependence on External Magnetic Field

Ladygina, M. S.; Petrov, Yu. V.; Yeliseev, D.V.; Makhlai, V.А.; Kulik, N.V.; Staltsov, V.V.

doi:10.46813/2021-131-061

Cited by 5 publications

(11 citation statements)

References 11 publications

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“…2) and plasma radiation (see Fig. 1) are similar to those obtained in pure hydrogen [9]. The mismatch between density values estimated from H and He II spectral lines is attributed to different regions of line radiation.…”

Section: Fig 1 Intensities Of Radiation Of Hydrogen (A C) and Helium ...supporting

confidence: 77%

“…The plasma stream was around 5 cm in the presence of a B-field and increased to 15 cm when the external magnetic field was switched off. The value of energy density in the axis region of the plasma stream varied in a range of 0.1 to 1 MJ/m 2 [6][7][8][9].…”

Section: Experimental Facility and Diagnosticsmentioning

confidence: 99%

“…Optical spectroscopy was used for the determination of plasma parameters (electron density and temperature) in front of exposed surfaces and the studies of the target impurity behavior in the plasma shield during a plasma surface interaction. It should be noted that the hydrogen spectral line H (4861 Å), as well as the line of He II with a wavelength of 4685 Å were used to evaluate plasma density [9,10]. Exposition time was 10 s.…”

Section: Experimental Facility and Diagnosticsmentioning

confidence: 99%

“…The exposure time ranged from 1 μs to 1 s; the spectral range was from 290 to 1100 nm. The velocities of the emitted particles and the instants of their ejection (from the target surface) are to be calculated using the information from the subsequent camera frames (with visible traces of the particles flying from the target surface after a plasma shot) [7][8][9].…”

Section: Experimental Facility and Diagnosticsmentioning

confidence: 99%

“…Quasi-stationary plasma accelerators (QSPA) are capable of reproducing ELM impacts in terms of both heat load and particle flux to the surface and can provide plasma transportation in an external magnetic field, which mimics the divertor conditions [6][7][8][9]. The energy transfer from pure hydrogen plasma to material surfaces during plasmasurface interactions (PSIs) in a magnetic field has been investigated in the recently developed quasi-stationary plasma accelerator, the QSPA-M [7,8].…”

Section: Introductionmentioning

confidence: 99%

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The Effect of a Small Helium Addition on the Plasma-Surface Interaction in Qspa

Makhlai¹,

Herashchenko²,

Petrov³

et al. 2023

Problems of Atomic Science and Technology

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The synergistic effects of tungsten exposure to combined hydrogen and helium particle fluxes as well as transient thermal loads need to be extensively studied for implementation of fusion reactor project. The mixture of hydrogen and helium was used as the working gas for plasma stream generation within the QSPA-M accelerator. The parameters of the mixed hydrogen and helium plasma were similar to those of pure hydrogen plasma generated in QSPA-M. It was shown that the small addition of helium (5 %) to hydrogen does not strongly influence plasma surface interaction. The influence of the external magnetic field on plasma surface interaction is also discussed.

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Section: Fig 1 Intensities Of Radiation Of Hydrogen (A C) and Helium ...supporting

confidence: 77%

Section: Experimental Facility and Diagnosticsmentioning

confidence: 99%

Section: Experimental Facility and Diagnosticsmentioning

confidence: 99%

Section: Experimental Facility and Diagnosticsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The Effect of a Small Helium Addition on the Plasma-Surface Interaction in Qspa

Makhlai¹,

Herashchenko²,

Petrov³

et al. 2023

Problems of Atomic Science and Technology

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Flows of ionizing gas in the plasma accelerator channel with longitudinal magnetic field

Козлов

2022

Physics of Fluids

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Model and results of numerical experiments are presented for axisymmetric flows of ionizing gas in the presence of an additional longitudinal magnetic field in the channel of quasi-stationary plasma accelerator considered as perspective electric propulsion plasma engine. A two-dimensional flow model for a three-component medium consisting of atoms, ions, and electrons is based on magnetogasdynamic equations written in terms of the vector potential of magnetic field, taking into account electrical conductivity, thermal conductivity, and radiation transfer. A three-dimensional model of radiative transfer includes main mechanisms of emission and absorption for different parts of the spectrum. Numerical studies of the ionization process and radiation transfer were carried out in an approximation of local thermodynamic equilibrium. The stabilizing effect of flow rotation in the presence of a longitudinal magnetic field and thermal conductivity along the magnetic field on non-stationary unstable flows of ionizing gas, which arise at low discharge currents, is considered.

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Vapour shielding of liquid-metal CPS-based targets under ELM-like and disruption transient loading

et al. 2021

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This paper presents experimental studies of plasma-surface interactions during powerful plasma impacts of a quasi-stationary plasma accelerator (QSPA) on the Sn capillary porous systems (CPSs) in conditions simulating disruption and edge localized modes (ELM) like loads. Experiments were carried out using two QSPA devices. ELM-like plasma exposures were performed with QSPA-M test-bed facility. A large-scale QSPA Kh-50 device was used to simulate plasma disruptions and giant ELMs. Variation of the plasma stream energy density has been performed to study the onset of vapour shield. It is shown that during plasma exposures of a Sn-CPS target with the QSPA plasma load <1 MJ m −2 , single dust particles traces have been registered. A further increase in the heat load leads to the splashing of the eroded material. For ELM-like impacts, a rather weak melt motion was observed on the target surface. A post-mortem analysis has shown that the CPS structure was not destroyed in the course of many repetitive ELM-like pulses. Surface morphology has changed from a smooth surface to corrugation structures with the formation of some cavities in mesh cells due to the influence of the surface tension and capillary effects. Spectral lines of Sn I and Sn II have been identified by optical emission spectroscopy in the near-surface plasma. A plasma shield, that consists mostly of Sn neutrals appears at Q ∼ 0.1 MJ m −2 . An increase in the surface heat load resulted in the intensive emission of Sn II lines, which started to be observed at Q ∼ 0.3 MJ m −2 . The plasma electron density near the surface increases significantly at Q > 0.5 MJ m −2 , which corresponds to the strong vapour shielding of the exposed surface. A comparison between the obtained results on the vapour shielding of Sn CPS and available numerical simulation using the TOKES code has been performed.

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Parameters of Hydrogen Plasma Streams in Qspa-M and Their Dependence on External Magnetic Field

Cited by 5 publications

References 11 publications

The Effect of a Small Helium Addition on the Plasma-Surface Interaction in Qspa

The Effect of a Small Helium Addition on the Plasma-Surface Interaction in Qspa

Flows of ionizing gas in the plasma accelerator channel with longitudinal magnetic field

Vapour shielding of liquid-metal CPS-based targets under ELM-like and disruption transient loading

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