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    User name A. Camsonne

    Log entry time 06:04:23 on October 30, 2008

    Entry number 245510

    keyword=RICH work / status

    With Youcai and Francesco we traced back one bad pedestal group to one ADC which was replaced. Pedestals look nicer now.

    Did dead time check, most dead time from yesterday was mostly due to the timeout loop which was too long. I tried to reduce it to 1000 but data did not look good 2000 gives reasonable data.

    We were not able to find the input for the grid plane, we will check with people from Roma.

    Pedestal are fixed. Dead time is pretty high still with T8 and with beam. This should improve quite a bit when I finish to fix the block transfer.

    I still need to decide if I want to implement a veto/busy logic depending on the time taken by the gassiplex to resets since we are triggering on the RICH electronics on T3 with a fast clear, so data with beam might still be a bit noisier. But still need to find a good optimum between dead time and quality of signal. Need to look at data with beam so a few runs with only T3 for RICH



    A copy of this log entry has been emailed to: cisbani@jlab.org