With Qweak target cooldown taking most of the 15 K coolant, Hall A targets all warmed up. They are all out of liquid phase. I closed D2 loop J-T completely. Trying to keep on cold return by maintain return temperature close to 30 K. Discussed with Greg Smith(Hall C) and Robert Norton (cryo). Greg agreed to reduce Hall C 15K flow slightly. The Hall A return temperature (CTD674) is stable at just below 40K. Robert thinks it is fine to leave it on cold return as long as it is stable (not rising).
Target Operator needs to monitor the return temperature while Hall C cooldown continues. If we can stay on cold return, then when Hall C completes cold-down, we will be able to colddown much more efficiently.