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    User name K. Lan

    Log entry time 18:56:06 on February 26,2000

    Entry number 21681

    keyword=SSD, Noise, Background

    Sammary of SSD test run
    Purppose of run: Noise scan at no beam
    Run # Vth of SSD Trigger condition
    31100 250mV Pulser, total 60k
    31101 260mV Pulser, total 60k
    31102 270mV Pulser, total 60k
    31104 280mV Pulser, total 120k
    31103 290mV Pulser, total 240k
    31105 300mV Pulser, total 480k

    purpose of run: Background study with beam_on Enge_off
    31110 Vth=320 pulser, trigger
    31111 Vth=320 sos, trigger
    31112 Vth=280 sos, trigger
    31113 Vth=260 sos, trigger
    These runs show sawtooth pattern.

    Run number from 31114-311244 are junks. ( auto noise did not run)

    Purpose of run: HNSS background noise study with Enge power_on
    Run# Vth trigger
    31124~31129 320mV SOS only
    These runs show flat pattern.
    need some more explination.