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    User name jpchen

    Log entry time 16:31:01 on February28,2001

    Entry number 57180


    keyword=Target operators, please adjust coolant flow (J-T valve) slowly

    Notice to cryotarget operators:

    Again, please adjust J-T valve SLOWLY. Even decreasing the heat load, do it slowly. Watching the ESR inlet temperature and the coolant flow (A_4K is senstive to
    ESR changes) when you make adjustment. Cryo-group send me this plot, showing
    the Hall A 15K flow increased from 9g/s to over 16g/s at around 4 am and then decreased from over 15.5 g/s to 5.5g/s in short time. This could be the cause for
    the ESR fluctuation sometime later.