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    User name jpchen

    Log entry time 13:55:07 on April24,2012

    Entry number 378446

    keyword=dilution runs and beam cenetr

    After beam back, we did the dilution and at the same time centered beam slightly:
    First with Empty/Home, beam poistion looks fine, took dilution run.
    Then 12C, saw both spot_3 and spot_++ that beam has hot spot at the bottom. Asked for meve beam down by 0.5 mm, took another run. Rate in 3rd imporved significant, spot_3 and spot_++ improved, but still some hot spot. Asked for another 0.5 mm lower in Y. Took another 12C run
    looked much better. Still slight hot.
    Moved to Dummy?corss hair adn asked beam abck with 0.25 mm down. No hot spot. Took two dilution runs.
    The final beam position in Y is -4.1mm in BPMB and -4.6mm in BPMA.