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    User name jpchen

    Log entry time 16:27:24 on February27,2001

    Entry number 57094

    keyword=Cryotarget switch from He4 to LH2/LD2 status

    Status of cryotarget switch from He4 to LH2/LD2:
    Started preparation at 7:30. Warm up started at 8:30. After switched to warm return,
    cryotarget group (Steve Knight) did swap of pressure transducer to mechanical gauge
    on the coolant line (at 9:20). Started to pump/purge/switch gas
    when target temperature went above liquid nitrogen temperature (at ~10:30). Completed Switching/pump/purge at 12:00. Started cool-down (LH2/LD2).
    At 15:00 switched to cold-return and moved to upstairs (counting house)
    to continue cool-down. Now we are at right temperature for both loops
    (LH2 at 19K and LD2 at 22K). But pressures are a little low ( LH2 at 21 psi and
    LD2 at 17 psi). Waiting for sweep to finish then need to go into the hall to add gas
    to the desired operation condition.