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    User name Peter Monaghan

    Log entry time 00:11:30 on January17,2005

    Entry number 139416

    keyword=Swing Shift Summary

    SL: Peter Monaghan
    TO: Konrad Aniol
    3rd: Eddy Jans

    16:00 Shift begins with runn 1844 in progress. Beam had been a little poor as MCC were doing a beam calibration for hall C. Gary Dezern called for an update on the target vacuum (halog entry 139370) and suggested cross-checking our readback for the vacuum with the one on the MCC screen.

    20:45 Bob Michaels called and asked to do a trigger scan to try and figure out why the datamon was reading a negative deadtime value. So we started several short runs, for each of which one of the triggers was set to give a daq rate of about 100 Hz, while all the others were prescaled away (runs 1850 - 1856 below).

    21:20 After completing the scan of the triggers for Bob, he found that T4 was the one giving the negative deadtime values in datamon. Bob explained that the same signal going into the trigger supervisor must be going into the scaler from which the deadtime is computed. This should be checked during the next access (see halog entry 139408). Then we resumed production data taking with T4 prescaled to around 2Hz - Bob explained that we still do wish to have T4 information in the data stream.

    00:00 Shift ends with run 1859 in progress and MCC having delivered fairly steady beam all evening long!


    Run Summary

    1844 15:25 - 16:46 200K events; LD2 4cm target; prescalers (1,2,3,4,5,6,7) - 350,20,60,100,1,99999,99999.
    1845 16:47 - 17:49 200K; parameters as above.
    1846 17:50 - 18:50 200K; parameters as above.
    1847 18:51 - 19:47 200K; parameters as above.
    1848 19:48 - 20:46 200K; parameters as above.
    1849 20:47 - 20:51 17K; stopped early to do the trigger scan for Bob Michaels.

    ---------------------------------------
    20:54 - 21:20 Trigger scan for Bob Michaels.

    1850 T1 test; ps1=80.
    1851 T2 test; ps2=1.
    1852 T3 test; ps3=14.
    1853 T4 test; ps4=6. <- showing negative deadtime.
    1854 T5 test; ps5=1.
    1855 T3 test (repeat due to unstable beam previously); ps3=14.
    1856 Production configuration with T4 set to high prescale value.

    ----------------------------------------

    Resume production data taking on liquid deuterium target.
    NOTE: Prescale values changed.

    1857 21:22 - 22:27 200K; ps1=350; ps2=20; ps3=60; ps4=200; ps5=1; ps6=99999; ps7=99999; ps8=65535. LD2 target.
    1858 22:28 - 23:30 200K; parameters as above.
    1859 23:31 - in progress when shift ends!