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Need help with building a heated box in cryogenic environment

Need help with building a heated box in cryogenic environment

Need help with building a heated box in cryogenic environment

Hi Everyone,
i got the requirement to build a heated box in a cryogenic environment.
The details:
we have a gamma detector working very well at RT, but at 10K it becomes a dead piece of material. Now the idea is to keep this detector at RT, put some flat-band Kapton heating foils around with a temperature sensor and hook it up to a PID controller. Insulate it well, keep cables at low heat conduction material, and hang the assembly on Nylon wires in the cryogenic environment in UHV and 1T magnetic field. The detector is quite small, 20x20x30mm3. The problem i have is with the insulation material that should be UHV compatible. Normally i would take MLI, eg 20-30 layers or so, but nobody can tell me how much this outgases,- after all, the outside should stay as low as possible (maybe 40-50K would be acceptable) and the inside should stay at RT. Some 20mm away from this box would be surfaces of 10K,- which i know from earlier tests does not influence the apparatus too much.
Would anyone of you have some suggestions how i could cut down thermal radiation to an absolute minimum without using MLI (or better with a sort of UHV compatibe MLI)
Any suggestion would be most welcome.
thanks in advance

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