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    User name M. Olson

    Log entry time 19:02:57 on August 6,2006

    Entry number 177760

    This entry is a followup to: 177755

    keyword=Loop 2 (LH2) JT adjustments, response sluggish

    I adjusted the loop2 (LH2) JT valve downward (closed) by 1.5%, in 0.5% increments, to decrease the amount of overcooling in the loop.

    The loop is currently set up for 20uA with the following assumptions:

    Beam heating @ 20uA: 100W
    Control overhead: 30W
    Additional allowance for transients: 20W

    Total Loop 2 heat load: 150W

    Note: The observed response to these 0.5% adjustments appeared to be quite slow, on the order of 15-20 minutes overall. The response when I rebalenced the heating was much faster, almost immediate, so I am a bit confused as to what the difference was in this case.