ILL4
ILL4 is a cryostat has a special, low-background sample chamber
used uniquely on FOCUS. There is an appartus for automatic liquid
helium fill for it.
In the sample sapce, there is a beam stop with an inner diameter of less than 60 mm.
The sample space diameter without beam stop is 68.5 +- 1 mm, the sample tube diameter down to the heat exchanger (at 825 mm cold) is 70.5 mm.
Solved Issues
- There was a large leak on the special vacuum tank on FOCUS.
