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    User name R. Michaels

    Log entry time 15:46:22 on October14,2009

    Entry number 294900

    keyword=comments re: cryo instabilities

    The cryotarget temp is unstable (fig 1). This is probably because
    the cryoflow is unstable (fig 2). Dave Meekins called and asked if
    the HP heater was not working. It is working and is for example
    818 Watts when beam is off. Sometimes it pegs at zero when the
    beam is on, but that happens if cryoflow goes low and is normal.
    I see no evidence that the HP heater is problematic. Dave said
    there is nothing we can do about this and that it's not a serious
    problem either -- unless we see some evidence in our data like
    more boiling or something.

    FIGURE 1

    FIGURE 2