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    User name Templon

    Log entry time 23:57:35 on June19,2000

    Entry number 44359

    keyword=running shift summary

    Run 2295 - junk (BOR was munged)
    Run 2296 - prescale factor still set to 1, stop run. 96 % deadtime
    Run 2297 - junk (accidental start)
    Run 2298 - deadtime still crazy. kill coda and restart (blind faith)
    Run 2299 - 1.3 M ...... 87.2 mC ..... no more deadtime problems
    Run 2300 - 1.3 M ...... 87.3 mC
    Run 2301 - 1.3 M ...... 87.3 mC
    Run 2302 - 1.3 M ...... 87.3 mC
    Run 2303 - 1.3 M ...... 87.3 mC
    Run 2304 - 1.3 M
    .
    prescale factor for T3 lowered from 3800 to 1300; significantly fewer T3s
    than other singles. Rikki just checked and ps factor has been as low as
    500 recently. Too many "sames" in logbook. Oops ... actually PS factor
    was not changed for 2305 - file was not saved.
    .
    Run 2305 - 1.3 M ...... 87.15 mC
    .
    further investigation shows PS factors were previously even lower for
    most triggers. change again. were: 13000/1400/1300/1000/1
    change to: 6000/500/500/1500/1
    .
    Run 2306 - 1.3 M ...... 84.9 mC
    Run 2307 - 1.3 M ...... 84.9 mC
    Run 2308 - 1.3 M ...... 84.7 mC
    Run 2309 - 1.3 M ...... 84.8 mC
    Run 2310 - 1.3 M ...... 84.9 mC
    .
    at 21:15 (EOR 2310) turn beam over to Moller crew.
    at 22:40 the Moller measurement is finished.
    .
    at 22:58 beam returns and we continue. Current has dropped to 66 uA (was
    about 72 uA at beginning of shift)
    .
    Run 2311 - 1.3 M ...... 85.7 mC
    Run 2312 - 0.5 M ...... 31.0 mC
    .
    23.28 - accelerator calls to "secure beam" for a few minutes (no explanation)
    23.37 - beam is back. They had to tune Hall B, and check that their changes
    ..............for B did not mung our tune.
    .
    Run 2313 - 0.5 M ...... 30.5 mC
    .
    23.47 - Hall B has problems again; accelerator wants to "cycle some magnets"
    .............. in order to try and reduce Hall B backgrounds. Asked about possible
    .............. implications for Hall A energy etc, they think none.
    .
    23.55 - beam back on although we were warned it may be temporary.
    .............. Hall B is evaluating their background with new situation.