• Main INDEX
  • Monthly INDEX
  • PREV
  • NEXT
    Make New Entry, Make Followup Entry

    User name silwal

    Log entry time 08:02:11 on December 3,2009

    Entry number 304319

    keyword=owl shift summary

    00:30 ask MCC for 110 uA beam for production
    00:50 compton rate looks bad, so Xiaoyan paged Alexander.
    00:56 lots of beam trips @ 110uA, so asked for 100 uA
    1:11 MCC taking beam away for about 15-20 minutes; they are looking into the cause of too many beam trips
    1:36 MCC is sending beam back. ask for 5 uA for quick spot check.
    1:39 as for 100/110uA, whichever they can deliver.. started with 100uA beam
    1:50 to 110uA beam now, stable for 5-8 minutes, then lots of trips
    2:07 ask MCC for 100uA beam, lots of beam trips. inform them that 90 uA would do if they can manage a stable beam.
    2:00 Megan is here and has taken control of compton. cant tell yet if the rates have improved due to unstable beam
    3:00 looks like MCC has finally settled on 90uA beam, still tripping, but much less than before
    3:10 Crew chief called in to say that they were having all sorts of issues in the injector. He was not sure what exactly was going on, but he hoped that the beam would be stable, and it has been stable for sometime.
    5:45 changed IHWP from IN to OUT


    Compton:
    run # 21363: production @ 110uA, to 100uA ~15 minutes into the run, 716K, stopped, background rates were too high. rebooted CODA, not sure if this is going to fix the problem. run # 21364: production @ 110uA
    run # 21365: production @ 90uA
    run # 21366: ?? not sure what this was
    run # 21367: production @ 90uA
    run # 21369: production @ 90uA, good signal/background rates, ROC crashed
    IHWP OUT
    run # 21370: production @ 90uA

    HRS:
    25940/5473: production @ 110uA, to 100uA ~ 10 minutes into the run
    25941/5474: production @ 100uA, to 110uA ~ 10 minutes into the run
    25942/5475: production @ 90uA
    25943/5476: production @ 90uA
    25944/5477: production @ 90uA
    IHWP OUT
    25945/5478: production @ 90uA
    25946/5479: production @ 90uA

    Parity:
    run # 14378: production @ 110uA, to 100uA ~ 10 minutes into the run, ~30K events
    run # 14379: production @ 100uA, to 110uA ~ 10 minutes into the run, lots of beam trips
    run # 14380: production @ 90uA
    run # 14381: production @ 90uA
    run # 14382: CODA hungup
    run # 14383: production @ 90uA
    IHWP OUT
    run # 14384: production @ 90uA
    run # 14385: production @ 90uA