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    User name Binet

    Log entry time 15:05:55 on August17,2001

    Entry number 71030

    Followups:

    keyword=Update on the Compton steering

    When beam came back, the position was good.
    We had usual counting rates in the photon detector.
    But there is still huge counting rates in the electron detector (~30 kHz instead of 5-6 kHz)

    Kind of same problem happened a few weeks ago (06/23/2001) but at that time beam diagnostics told us that the beam was mistuned in the cavity and was scrapping on the mechanical devices of the mirrors.
    This time, the beam seems to be well tuned (according to the beam diagnostics), so my only guess for the moment is that the beam is misfocused after the cavity.
    Thus, the huge background we are now seeing in the electron detector might be induced by electrons of the halo.