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    User name Lingyan

    Log entry time 06:41:20 on January12,2001

    Entry number 54419

    This entry is a followup to: 54358

    Followups:

    keyword=HV change for S1, gas and aerogel

    The small gain of left arm gas cherenkov channel #9 is because the HV too low, only 2200, while the rest is greater than 2500. So we increased it to 2600.

    HV changes
    ===========

    between run 1207 and 1209:

    left arm s1_R_4 : from 2050 to 2125
    left arm gas adc_9 : from 2200 to 2600
    right arm AM adc

    between run 1208 and run 1210:
    left arm A2 adc

    after run 1219 before run 1229:
    the hv for aerogle detectors were further adjusted to get better gain.
    Now the single photo-electron peaks of A1 and AM are around 100, and those of a2 are around 150-200.