• Main INDEX
  • Monthly INDEX
  • PREV
  • NEXT

    User name Ole Hansen

    Log entry time 07:58:12 on June11,2000

    Entry number 43456

    keyword=Shift Summary

    At start of shift, work in progress in the Hall to replace broken cooling water pump for the beam diffuser.

    ~1:00 .. Q3 on electron arm quenches. Mark Stevens resets it while in the Hall.
    1:50 ... Pump fixed. Water flow restored. Ready for beam.
    2:00 ... Beam arrives. Quick spot check.
    2:20 ... Start production. Current ~60uA.
    2:30 ... High deadtime. Resetting CODA.
    2:33 ... Start run #1919. Deadtime looks better (~19%).
    2:50 ... Bad beam, RF trips every 10 minutes.
    3:55 ... Beam was nice and stable for a while during run 1922, trips now during 1923.
    4:20 ... Intermittent beam again, run# 1924. Beam current 60uA as before.
    5:45 ... Target IOC crash. We're down for a few minutes.
    6:00 ... IOC is back. Resume data taking.
    6:05 ... Beam is back, but trips a lot.
    6:08 ... Stable beam now.
    6:40 ... Ending run 1931 early because the deadtime is fluctuating again. Resetting CODA.
    7:07 ... Another Q3 quench. Asking for access...
    7:45 ... Q3 OK. Resuming production.


    Start time ... Run# ... #Events ... Comments

    07:45 .......... 1934 ..... 1.3M
    07:01 .......... 1933 ..... n/a ............ Ended because of Q3 quench
    06:41 .......... 1932 ..... 1.3M
    06:19 .......... 1931 ..... 1.2M ........ Deadtime fluctuations, ended early
    06:01 .......... 1930 ..... 1.3M
    05:38 .......... 1929 ..... 0.7M ........ Ended because of target IOC crash
    05:21 .......... 1928 ..... 1.3M
    05:03 .......... 1927 ..... 1.3M
    04:46 .......... 1926 ..... 1.3M
    04:29 .......... 1925 ..... 1.3M
    04:08 .......... 1924 ..... 1.3M ........ More beam trips
    03:49 .......... 1923 ..... 1.3M ........ Frequent beam trips
    03:31 .......... 1922 ..... 1.3M
    03:13 .......... 1921 ..... 1.3M
    02:52 .......... 1920 ..... 1.3M ........ Frequent beam trips
    02:33 .......... 1919 ..... 1.3M
    02:15 ...........1918 ........................ High deadtime, bad run