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    User name S. Sirca

    Log entry time 00:00:00 on January23,2001

    Entry number 55456

    keyword=Cryo targets status

    Presently, the temperatures in the cryo-target loops are past the LN2.
    The pressures are 45 psi (LH2, PT131) and 24 psi (LD2, PT140).
    The first pressure is OK, the second is suspiciously small.
    We opened/closed CSV62 (connecting supply to return) and closed/opened
    CSV56 (connecting bottle to supply) and nothing changed. Differential
    pressure in the loop (DP141) is zero. According to Jian Ping, there are three
    possibilities:

    - we have lost a lot of gas during venting
    - the pressure transducer is broken (unlikely)
    - both sides (pipes) leading to/from the valve are frozen (this would be bad)

    Night shift: keep an eye on the LD2 loop, but there is not much you can do.
    Note: do not touch the relief valve (CSV57).