• Main INDEX
  • Monthly INDEX
  • PREV
  • NEXT

    User name paschke

    Log entry time 15:11:20 on August 9,2003

    Entry number 109722

    keyword=RHWP scan aborted


    Tried a RHWP scan during the kinematics change, but MCC took the beam away
    for an FOPT just after I started. I gave up, so that I wouldn't interfere with production.

    What I did:
    1) reset PC HV to "best circular polarization" values: +7.383, -7.518. Reset IA
    cell to 5.0. Unfortunately, I forgot to turn off feedback, so Run 3815 pegged the
    IA cell. Reset IA cell to 5.0, and turned off feedback. Beam HWP was IN.

    2) Beam at 10 uA, Run 3816. Measured only to RHWP points before beam
    vanished.
    RHWP=7000 (140 degrees), Aq = -4170, ev#<2500
    RHWP=6500(130 deg) Aq=-4970, ev#>3800

    So, this doesn't look terribly promising in this region. Still, we should try again.
    A reduction in sensitivity to linear polarization may improve some systematic effects,
    such as the large separation of multiple peaks in the charge asymmetry.