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    User name A. Camsonne / D. Wang

    Log entry time 00:50:17 on May 09, 2009

    Entry number 271915

    keyword=Compton vertical scan

    Diancheng noticed that the rates for the photon were always low and he checked the positions which have moved from the 3 pass settings. Previously was

    X position on 1P02A -1.4836 Y position on 1P02A -0.549388 X position on 1P02B -1.39416 Y position on 1P02B -0.924716 X position on 1P03A -1.83622 Y position on 1P03A -0.265275

    the position was : X position on 1P02A -1.46512 Y position on 1P02A 0.316386 X position on 1P02B -1.35597 Y position on 1P02B 0.180975 X position on 1P03A -1.75757 Y position on 1P03A 1.30023

    so the beam was a bit too high and missing the laser.

    We did a vertical scan with MCC and the final values set are now : MCP1P01-4 bdl (G.cm) 462102 X position on 1P02A -1.48231 Y position on 1P02A -0.659491 X position on 1P02B -1.3478 Y position on 1P02B -0.876064 X position on 1P03A -1.74871 Y position on 1P03A 0.648169

    and gain was set to 8.054.

    This seems to givethe best photon rates at around 500 Hz/uA