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    User name R. Feuerbach

    Log entry time 10:18:05 on October 14, 2005

    Entry number 156782

    This entry is a followup to: 156765

    keyword=septum set points in Helium vs. Now

    Just to remind everyone, below is a table of the momentum and septum current set-points during the helium run period (one month ago). These values are the nominal ones we ran with, and were specifically taken from production 4909: 

           p0(GeV/c)  Iseptum(A)     I/p0
R-HRS   2.733      278.22       101.80  A/GeV
L-HRS   2.737      283.57       103.61  A/GeV

    This is a 10% higher septum current than the "standard match" (from the HowTo page), which was given as: 

    Right Septum set current = 92.58 * P0 (GeV/c)  
Left Septum set current  = 94.22 * P0 (GeV/c)

    We had seen 5-10% higher rates on the detectors with the septum at +10% (halog entry 149415 ) due to pulling from smaller angle and smaller Q2.

    The +10% septum setting is a reasonable starting point, and compatible with what was done during Helium.