• Main INDEX
  • Monthly INDEX
  • PREV
  • NEXT

    User name M. Rvachev

    Log entry time 05:49:30 on June26,2001

    Entry number 64651

    This entry is a followup to: 64608

    keyword=Beam charge asymmetry oscillations

    At appr. 4:15am beam charge asymmetry started sinusoidal fluctuations with
    amplitude ~700ppm, mean value of 400ppm and period ~60 minutes. From 0:00am
    to 4:15am asymmetry was small. It seems that yesterday's pattern repeats as if
    fluctuations are correlated to time of day. MCC says nothing has been changed in
    setup during the night and they don't know what can stop them.

    A parity log entry # 22646 from July 15,1999 links period of current fluctuations
    to "frequency of the compressor", the original is at
    http://hallaweb.jlab.org/parity/log/html/9907_archive/990715073808.html
    also the text is pasted below.


    User name M.Baylac

    Log entry time 07:38:08 on July 15,1999

    Entry number 22646

    keyword=Current oscillations time constant

    Time constant of current oscillations changed after injector people changed the frequency of the compressor :
    it is now ~ 11 minutes



    FIGURE 1