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    User name vasulk

    Log entry time 05:22:45 on April28,2003

    Entry number 99086

    keyword=Owl Shift Summary Part 2

    01:40 Hall A in Controlled Access to add sieve-slits to block background from beam right.
    03:25 Access over, now Power Permit

    03:33 Run # 20367/1367 Single Carbon foil, Septum Set at 162.8 Amps with additional sieve-slits. (read back current 178.5 Amps)
    Trigger rate drop by about 1 kHz on T1 (2.8 K vs. 3.8) compared to run # 1366/20366
    which only had the 6 degree sieve-slit

    03:44 Set Septum current to 98.8 Amps

    03:55 Septum current at 115 Amps (read back)
    Run # 20368/1368 Single Carbon foil, and extended sieve-slits

    04:10 Ask to mask target to move to empty position

    Run # 20369/1369 empty target, and extended sieve-slits, Septum current at 115 Amps

    04:26 Move to Reference cell position for empty reference cell run
    Run # 20370/1370 empty reference cell run with extended sieve-slits, Septum at 115 Amps (T1 rate only ~ 400 Hz) reduced rate maybe from trip of Q2

    04:40 Increase current to 2 microAmps
    Run #20371/1371 empty reference cell run with extended sieve-slits

    04:44 Right Q2 tripped, reset and cycle
    04:52 Right Q2 set at 1.14730 GeV/c

    04:58 Run # 20372/1372 empty reference cell run with extended sieve-slits
    T1 rate back to 4.5 kHz

    05:07 Remove target OTR to see if any change, rate does not change
    05:09 Target OTR reinserted

    Run # 20373/1373 empty reference cell run with OTR removed and reinserted
    Run # 20374/1374 same as above, Septum at 115 Amps, T1 rate 4.4 kHz