I am working on a system under UHV at very low temperature. Now I need to solder thermocouple wires to feedthrough (i.e. two copper pins sticking inside from one fo the vacuum port.
I want to solder thermocouple wires of extremely low temperature (~10K) for UHV applications. It appears that lead-free solder (e.g.95%tin5%silver) works but I have no experience so far. So I want to know the answers for the following questions. If you know, please let me know!
1) what shuold I need to consider for soldering?1) what materials should I use? Lead-free solder (tin-silver)? 2) where can I buy it?
Thank you for your support in advance!!