Theoretical modeling of shielding for plasma flow and electron beam heating

Попов, В. А.; Arakcheev, A. S.; Burdakov, A. V.; Kasatov, A. A.; Vasilyev, A.; Vyacheslavov, L. N.

doi:10.1063/1.4964217

Cited by 10 publications

(4 citation statements)

References 10 publications

(12 reference statements)

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“…The machine is able to provide 25 GWm -2 heating power density absorbed in a tungsten target in maximum at high-power operating mode and F HF >300 MJm -2 s -0. 5 . The details of the facility operation with the tungsten target are described elsewhere [6].…”

Section: Test Facility Electron Beam Sourcementioning

confidence: 99%

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Novel electron beam based test facility for observation of dynamics of tungsten erosion under intense ELM-like heat loads

Vyacheslavov

Arakcheev

Бурдаков

et al. 2016

AIP Conference Proceedings

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Section: Test Facility Electron Beam Sourcementioning

confidence: 99%

“…It corresponds to heat flux parameter F HF =70-100 MJ m -2 s -0.5 [4]. Long pulse electron beam (LPEB) produces negligible direct pressure and has much higher limit of absorbed power density due to vapor shied effect [5]. Besides, LPEB creates relatively low background light which facilitates operation of diagnostics.…”

Section: Introductionmentioning

confidence: 99%

Novel electron beam based test facility for observation of dynamics of tungsten erosion under intense ELM-like heat loads

Vyacheslavov

Arakcheev

Бурдаков

et al. 2016

AIP Conference Proceedings

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“…Recently, a mechanism has been considered that can explain the time and place of generation of microparticles [24]. After the heating ceases, the surface of the melt begins to cool rapidly due to evaporation.…”

Section: Three-dimensional Tungsten Particle Tracking Using Three-ang...mentioning

confidence: 99%

Diagnostics of the dynamics of material damage by thermal shocks with the intensity possible in the ITER divertor

et al. 2018

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A novel BETA test facility (Beam of Electrons for materials Test Applications) was developed at the Budker Institute to study the erosion of materials directly during the impact of intense thermal shocks. A powerful (up to 7 MW) long pulse (100-300 μs) electron beam is applied for experimental simulation of fast transient heat loads with the intensity probable in the ITER divertor. The heat flux parameter on a target can be widely varied (F HF =10-300 MW m −2 s 0.5 ) from a value significantly below the melting threshold to a value much higher, within the area of about 1 cm 2 . The use of an electron beam to simulate the thermal impact on the material surface makes it possible to employ a variety of optical diagnostics for in situ observations of the dynamics of surface erosion processes during intense thermal shocks. These distinctive features make BETA a promising tool in the research of material surface erosion mechanisms and for experimental verification of various analytical and numerical models associated with these mechanisms. The first results obtained with this facility include fast (10 μs exposure) imaging of the heated target in the near-infrared range and in the reflected light of 532 nm continuous wave (CW) laser, visualization of ejected tungsten particles using fast ICCD and CCD cameras with the minimal exposure of 2 μs and 7 μs respectively. The dynamics of dust particles ejected from the heated surface is investigated using a multichannel recording of the light of 532 nm CW-laser scattered on the dust particles. The present paper describes the first results of use of two new in situ methods: continuous recording of light scattered from the tungsten surface and threedimensional tracking of tungsten particles using three viewing angles. The first method makes it possible to observe the dynamics of development of roughness and cracking of the polished tungsten surface, which manifest themselves as two successive processes separated by a large time delay. The second method allows us to track dust particles ejected from the melt layer, and thus determine the time and place of particle ejection from the surface.

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“…Review [3] summarizes the main approaches to the facilities for simulation of high heat flux loads in the ITER divertor. Electron guns are essentially inferior to plasma accelerators in terms of irradiated area, however, they are not particularly limited by vapor shielding effect [3,4]. Electron beam facility similar to JUDITH [3,5,6] used industrial guns based on thermionic cathode producing electron with: energies of 30 keV, the power of up to 0.6 MW and a pulse duration from 1 ms to a continuous mode.…”

Section: Introductionmentioning

confidence: 99%