Analysis of Plasma Shield Formation and Graphite Target Erosion in Disruption Simulation Experiments With High Power Quasistationary Plasma Streams

Chebotarev, V. V.; Garkusha, I.E.; Garkusha, V. V.; Makhlaj, V.A.; Mitina, N.I.; Pestchanyi, S.; Solyakov, D. G.; Tereshin, V.I.; Trubchaninov, S. A.; Tsarenko, A. V.; Würz, H.

doi:10.1016/b978-0-444-82762-3.50058-6

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“…devices are the major tool to simulate reactor-class plasma loads. Quasi-stationary plasma accelerator (QSPA) devices [2,[4][5][6][7][8] can produce a low temperature (<100 eV) and ITER ELM relevant energy density (0.5-2 MJ m −2 ) plasma loads for a 0.2-0.5 ms pulse length. These devices are mainly used for experimental simulation of material erosion under transient heat loads [2,7].…”

Section: Estimation Of Suppressed Erosion By Vapor Shielding At Be An...mentioning

confidence: 99%

“…As a result, 0.07-0.2 μm W erosion per pulse was observed after a pulse of 1.5 MJ m −2 absorbed heat energy in 0.5 ms [2]. As well as these erosion studies, vapor shielding experiments [4][5][6] were also extensively taken in QSPAs. Optical observation of a shielding vapor layer and calorimeter measurements confirm a saturation of absorbed heat load on a surface when the plasma stream energy density reaches over 2.0 MJ m −2 at W specimens.…”

Section: Estimation Of Suppressed Erosion By Vapor Shielding At Be An...mentioning

confidence: 99%

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Estimation of suppressed erosion by vapor shielding at Be and W walls under transient loads

et al. 2019

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In ITER and future fusion devices, wall erosion caused by transient heat loads, edge-localized modes (ELMs) and disruptions is a serious concern. Suppression of the erosion occurs when a significant vapor emission happens under the heat loads, which is known as vapor shielding. Estimation of the suppressed erosion amount is essential for life time analysis and reactor design. In this study, we developed a particle-in-cell simulation code for the vapor shielding, PIXY, and applied the code to the erosion estimation for Be and W walls under a pulsed heat flux of 1-20 GW m −2 within 0.2 ms, which simulates a short-duration ELM pulse. Heat fluxes reaching the wall are recorded separately for electrons and ions, and reveal effective physical processes during the vapor shielding at Be and W walls. Then, for these walls, the total erosion amounts with and without vapor shielding are evaluated and compared. Estimated total erosion is larger for the Be wall up to 10 GW m −2 . The Be wall erosion becomes saturated for the heat flux >10 GW m −2 due to its effective shielding, while the estimated W wall erosion eventually overcomes the Be wall erosion. In the short-time scale studied in this paper, effective radiation cooling by W vapor clouds is not observed. A simple wall life time analysis based on the estimated erosion rate shows 10 mm of W wall will survive 10 7 ELM loads with energy density less than 1 MJ m −2 .

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Section: Estimation Of Suppressed Erosion By Vapor Shielding At Be An...mentioning

confidence: 99%

Section: Estimation Of Suppressed Erosion By Vapor Shielding At Be An...mentioning

confidence: 99%

Estimation of suppressed erosion by vapor shielding at Be and W walls under transient loads

et al. 2019

View full text Add to dashboard Cite

show abstract

Analysis of Plasma Shield Formation and Graphite Target Erosion in Disruption Simulation Experiments With High Power Quasistationary Plasma Streams

Cited by 1 publication

References 3 publications

Estimation of suppressed erosion by vapor shielding at Be and W walls under transient loads

Estimation of suppressed erosion by vapor shielding at Be and W walls under transient loads

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