May 25th, 2021

Attended: Moskov, Sean. Justin, Mikhail, Jim, Hovanes, Eugene, Pavel, and Igor.

• The transition fluence for void swelling in irradiated pure copper is the issue as Bogdan pointed out. First of all, thank you, Pavel, for sending us a nice overview [1]. Actually, the main source of the problem is (n, alpha) and (n,t) reactions and the bottom line is to prevent a transition fluence for void swelling in irradiated pure copper, we have to (1) keep the temperature of our Cu radiator below 200°C (2) use Cu with 2%Be and/or 3.5%Ti.