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    User name Olivier

    Log entry time 18:51:15 on January25,2005

    Entry number 140026

    This entry is a followup to: 140023

    keyword=Pulser test analysis

    Here is the analysis of the pulser test.

    Pulser setup:

    Right arm:
    pulser -> electronics ................. 325ns
    electronics -> trigger formation ...... 18ns

    Left arm:
    pulser -> electronics ................. 297ns
    electronics -> trigger formation ...... 18ns

    The TDC STOP (formed by a T5 which is timed by L arm) arrives at:
    297 + 18 + delay_L = 315 + delay_L
    where delay_L is a fixed time between L-arm trigger formation and arrival of STOP in TDC

    Neutron Arm:
    pulser -> patch panel ................. 220ns

    The TDC START (formed by this signal) arrives at:
    220 + delay_ND
    where delay_ND is a fixed time between patch panel and arrival of START in TDC

    The pulser test shows the TDC channel to be 777, so 388ns (which is STOP-START).
    So STOP-START = 388 = (315 + delay_L) - (220 + delay_ND)
    which gives (delay_L - delay_ND) = 293ns



    Real particle setup:

    Right arm:
    reaction -> electronics ................ 107ns
    electronics -> trigger formation ....... 61ns

    Left arm:
    reaction -> electronics ................ 90ns
    electronics -> trigger formation ....... 61ns

    The TDC STOP arrives at (given by left arm):
    90 + 61 + delay_L = 151 + delay_L

    Neutron detector:
    reaction -> detector ................... 66ns
    detector -> patch panel ................ 12ns

    The TDC START arrives at:
    66 + 12 + delay_ND = 78 + delay_ND

    So the STOP-START is:
    (151 + delay_L) - (78 + delay_ND) = 73 + 293 = 366 ns

    So the neutron peak should appear at channel 732. Give or take.