| 摘要 |
The invention relates to measuring engineering, the proposed cryostat is intended for cooling at carrying out supersensitive magnetic measurements by means of SQUIDs, first of all – magnetic encephalography. To decrease intrinsic noises of cryostat, the heat screen is made of 2 sections, where the lower section that is near the SQUIDs, differs by the fact that it is made continuous, with thickness not less than 1 mm, it is made of sapphire, polycor or germanium. The upper part of the mouth for decrease of diffusion of helium to vacuum volume is made by winding between the glass fabric layers additional layers of glass or polymer strip, this in one of embodiments is modified through covering with thin metal film, not more that 0.2 µm. |
