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    User name mcnulty

    Log entry time 16:43:13 on August29,2009

    Entry number 286848

    keyword=Dummy Al spectra (regarding HapDet alignment)

    Figure 1 are the alignment plots from run 4389 (Dummy Al target).
    For comparison, I've included the H2 target dists from run 4382 (Figure 2).
    We certainly should consider the placement of the Al background events; to further de-emphasize the background events we could move the hapdet further in negative y and/or rotate to greater yaw angle. We could also consider decreasing Po to shift more of the higher rate Al bkgd blob off the hapdet; I estimate we have at least 10cm we could push the super-elastic edge toward the pmt.

    Note that in these plots, the box outline has been shifted to negative y by 2cm relative to previous plots (to be consistent with the changes made during the access).

    FIGURE 1

    FIGURE 2