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    User name Jixie Zhang

    Log entry time 02:39:34 on April 12, 2012

    Entry number 372995

    keyword=New right septum field map (40-00-16 turns of coils)

    Attached is the field for 40-00-16 turns of right septum, plotted on top
    of the left.  It is plot with the tosca map which has 800A in the left
    and 895A in the right (these 2 current match well for 40-32-16 turns of
    right septum).  One can see that after removing additional 4 wires from
    the 2nd coil in the top, the field in the right change shape a lot.
    
    For the right septum, the field at the top is now ~10% lower than that at
    the bottom. That is, the field in the vertical edges(y=+/-9.5cm) are
    +/-5% away from that at the center(y=0).
    
    For the left septum, the field at the top is now ~1.4% lower than that at
    the bottom. The field at the bottom (y=-9.5cm) is +3.5% larger than that
    at the center(y=0), while the field at the top is only 2% larger.
    
    We have already seen acceptance lose in the right HRS due to this. 
    
    


    A copy of this log entry has been emailed to: g2p_ana@jlab.org



    Figure 1