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    User name jpchen

    Log entry time 17:13:57 on August 27, 2009

    Entry number 286367

    keyword=cryotarget is using 4K coolant, information for target operator

    The cryotarget is currently being cooled down with 4 K coolant from CHL to ESR into the target. The target temperature is about 24-25K and in a few hours it should reach 19K, the operation temperature. With the 4K coolant, there is a potential danger of H2 gets frozen. So Target Operator should pay attention to make sure H2 target temperature will not drop too low (freezing point is slightly below 14K). In normal condition high power heater is set in PID to keep the loop temperature at 19 K. In the event of the High power heater fails, Target Operator should slowly reduce the coolant (by closing J-T valve) to prevent the H2 target from freezing.