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    User name C. C. Chang

    Log entry time 23:52:59 on March24,2001

    Entry number 59270

    keyword=Target control problem

    At about 23:30 while beam went off due to power supply problem, target alarm
    came on. The target temperature continued to drop down to about 15.5 K. Lingyan
    turned the cooling down just to keep the temperature from dropping further. The
    reason for the drop in temperature could be due to the stuck heater; the heater stuck
    at about 100W level. Lingyan rebooted the target IOC. The target temperature was restored back to 19Kafter regaining heater control. We will keep an
    eye on the target temperature when beam
    comes back (we lost the beam due to power supply problem; there was no estimate
    as to when beam will be back).