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    User name xqian

    Log entry time 15:11:03 on November 04, 2008

    Entry number 246668

    This entry is a followup to: 246489

    keyword=BigBite Wire Chamber Update

    Chamber-2 and Chamber-3 can run with 4.4V threshold now. The original threshold is 3.5V. We are still not sure what reason causes this problem.

    Thus, at this stage, we will keep the threshold at 4.4V. In the control access later, we will lower the voltage on the power line of the A/D cards from 6.1V to 6.0V. Then, we will try to see if we can lower our threshold.

    Here is the plot of the wire hit pattern with cosmic with 3.5+4.4+4.4V threshold. Everything looks fine.

    Figure 1