Research and development of thermal shield support under radiation environment in large helical device
✍ Scribed by Shigehiro Nishijima; Toichi Okada; Moriyosi Kanamaru; Junya Yamamoto
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 236 KB
- Volume
- 32
- Category
- Article
- ISSN
- 0011-2275
No coin nor oath required. For personal study only.
✦ Synopsis
The thermal shield support used under radiation environments for Large Helical Device (LHD) has been developed considering the thermal properties and the radiation resistance. The ceramic materials were chosen as the candidate. After the screening was made considering the thermal conductivity, mechanical properties and thermal expansion coefficient at room temperature, the zirconia was chosen as the support.
The thermal conductivity down to 10K was measured and the thermal penetration through the zirconia support was calculated comparing that with the stainless steel support. It was found that approximately i/5 of heat penetration to 80K and 1/4 of that to 4.2K shield will be realized using zirconia support compared with using the stainless steel support.
The machinability of the zirconia was also examined and found that the bolt shaped shield support was confirmed fabricable.
It was concluded that the zirconia cryogenic support is the most possible candidate for thermal shield under radiation environments in LHD.