NIFS-MEMO-17

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Author(s):

江尻 晶
A. Ejiri

Title:

LHDにおける窓の熱設計
Calculation of the Heat Transfer in the Windows of the Large Helical Device

Date of publication:

Nov. 1995

Key words:

LHD device, steady state operation, heat transfer in the window, 2-dimensional heat conduction equation, quartz glass, quartz, stainless steel, peripheral cooling, black-body radiation, forced air-cooling, natural air-cooling

Abstract:

Temperature of the windows used in the LHD device has been calculated by solving 2-dimensional heat conduction equation. The windows are heated by radiation from the plasma and they are cooled by peripheral cooling, black-body radiation (and by forced air-cooling). Quartz glass, quartz, and stainless steel are used as the material of the windows. The temperature of quartz or stainless windows, which have higher thermal conductivity, are not too high. For a large quartz glass window (of which minor radius is larger than about l0cm), the black-body radiation becomes the dominant cooling path, and the temperature can be as high as 400 degreeC. Smaller windows have lower temperature. In the case of forced air-cooling, temperatures become much lower, especially for a quartz glass window.

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