Publication: The dependence of lithium emissivity from temperature in vacuum ЗАВИСИМОСТЬ СТЕПЕНИ ЧЕРНОТЫ ЛИТИЯ ОТ ТЕМПЕРАТУРЫ В ВАКУУМЕ
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2019
Авторы
Prishvitsyn, A. S.
Krat, S.
Harina, A. P.
Pisarev, A. A.
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© 2019 National Research Center Kurchatov Institute. All rights reserved.Correct interpretation of IR video observation data of the surfaces of plasma-facing elements in fusion devices requires detailed knowledge about the emissivity factor of these surfaces in different conditions. In this work, results of emissivity measurements for free metallic lithium surface and a lithium surface supported by the capillary-porous system (CPS) are measured as a function of temperature in the range from 400 to 800 K. Emissivity of solid lithium changed from ~0.04 at 400 K to ~0.09 at 453 K. During melting a sudden drop of emissivity down to ~0.04 was observed. Emissivity increased linearly from 0.04 to ~0.15 with temperature increasing from 455 to 800 K. For fully wetted CPS, emissivity was close to that of free lithium surface for temperature up to ~570 K, while at higher temperature it was lower, probably due to changes in microrelief at high temperatures.
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The dependence of lithium emissivity from temperature in vacuum ЗАВИСИМОСТЬ СТЕПЕНИ ЧЕРНОТЫ ЛИТИЯ ОТ ТЕМПЕРАТУРЫ В ВАКУУМЕ / Pricshivichin, A.S. [et al.] // Problems of Atomic Science and Technology, Series Thermonuclear Fusion. - 2019. - 42. - № 2. - P. 89-95. - 10.21517/0202-3822-2019-42-2-89-95