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    User name R. Lindgren

    Log entry time 16:01:20 on June11,2000

    Entry number 43494

    keyword=Shift summary

    8:02 Fast feedback is off. Trouble with the locks.
    8:10 Fast feedback is back on. Beam position is okay.
    8:57 Stop beam for MCC routine magnet test
    9:35 Q3 tripped. Called MCC for access.
    10:00 Q3 back up and beam back
    11:00 Beam up and taking data.
    11:55 Beam off
    11:57 Beam on
    12:51 Q3 quench fault.
    13:15 Ramping Q3 back up
    Is it possible that radiation damage to electronics of Q3 power supply is causing the magnet to trip off? We noticed that there is almost an unshielded straight line between the edge of the back of the power supply cabinet and a section of the beam dump. Certainly when you stick the radiation probe in that pathway the rate goes up significantly. Perhaps, a lead blanket should be draped over the back of the power supply cabinet.
    13:28 Beam back on.
    14:50 Taking data.
    15:20 Beam off by MCC to retune and reboot IOC
    15:45 Q3 tripped again.
    15:58 Reset Q3 and ramp up to 1600











    Start Time.......Run Number......Events.......Current(ua)........Charge(mc)......Replay
    8:04.................1935....................1.3M..........58.9....................55.24.................Yes
    8:21.................1936....................1.3M..........58.4....................55.3....................No
    8:44.................1937....................0.83M........58.......................35.12..................Yes
    10:06...............1938....................1.3M..........57.8....................56.02..................No
    10:26...............1939....................1.3M..........57.0....................56.0....................Yes
    11:09...............1940....................1.3M..........56.8....................55.9....................No
    11:26...............1941....................1.3M..........56.8....................56.1....................Yes
    11:45...............1942....................1.3M...........56.5...................56.4....................No
    12.04...............1943....................1.3M...........56.2...................56.4....................Yes
    12:22...............1944....................1.3M...........55.4...................56.7....................No
    12:41...............1945....................0.75M.........55.1...................56.1....................Yes
    13:28...............1946....................1.3M...........53.1...................57.7.....................No
    13:50...............1947....................1.3M...........53.3...................57.8...................Yes
    14:12...............1948....................1.3M...........52.9...................58..3....................No
    14:32...............1949....................1.3M...........52.2..............................................Yes
    14:55...............1950....................0.97M.........51.......................44.1....................No
    15:31...............1951....................0.51M.........50.8...............................................Yes