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    User name Chang

    Log entry time 22:01:44 on April24,2003

    Entry number 98547

    keyword=Rate vs beam position study

    Beam position T1 T2 T3 T4

    0.08/0.15 4.0x10^4 246 1.4x10^4 90
    1.03/0.11 4.1x10^4 251 1.4x10^4 90
    2.03/0.10 4.2x10^4 280 1.4x10^4 85
    -1.0/0.14 3.9x10^4 225 1.3x10^4 90
    -2.0/0.21 3.9x10^4 215 1.3x10^4 80
    0.02/2.07 3.8x10^4 220 1.4x10^4 85
    0.00/-2.01 4.0x10^4 215 1.4x10^4 83

    Conclusion: Rates seem to be constant even by steering beam by +- 2mm
    along both x and y.; not the reason for high background rates.Chang