These are the "with beam values" pedestal subtracted signals. If I do not do any ped subraction you can see that the Blue histo on mirror 3 does fall off on both sides. I attached that plot below (aps_mir3_no_cor.png).<br>
<br> Both the red and blue histos have the following cuts on them:<br><br> "BB.tr.n==1 && abs(BB.tr.vz[0]<0.2) && BB.tr.p[0]>0.4 && BB.tr.p[0]<2.0 && ((DBB.evtypebits&1<<2)==(1<<2)) "<br>
<br>I then go ahead and plot lets say the corrected (1pe aligned to chan 30 and ped subtracted from " with beam ped" ) ADC 13. <br><br>For the red histo I then apply a TDC and mirror cut that apply to mirror 13. Where as for the blue histo I apply to mirror 13(ie. ADC 13 ) a cut on the TDC and mirror associated with mirror 17.<br>
<br>But if I replay the first 100,000 with a T8 cut ("DBB.evtypebits&1<<8)==1<<8") the peds I get for both sides are below (1849_beam.png and 1849_rhrs.png) for the beam line and rhrs sides.<br>
<br>Since when I make that "background" cut (blue histo) on mirror 13 and have a non zero centered peak, does that mean there is some correlation between mirror 13 and 17? <br><br><br><div class="gmail_quote">On Tue, Feb 9, 2010 at 2:17 PM, Brad Sawatzky <<a href="mailto:brads@jlab.org">brads@jlab.org</a>> wrote:<br>
<blockquote class="gmail_quote">On Mon, 08 Feb 2010, MATTHEW R POSIK wrote:<br>
<br>
> Yes, the plots in slide 10 are pedestal subtracted.<br>
<br>
Are those pedestals the "LED" pedestal, or the "with beam" values?<br>
<br>
On Mirror 13, if the blue is truely uncorrelated signal then it is, by<br>
definition, the 'with beam' pedestal.<br>
<br>
For Mirror 3, it's hard to tell if the blue peaks at zero and then falls<br>
off, which would be consistent with a (wide) pedestal, or if keeps<br>
climbing, which would suggest the pedestal subtraction isn't quite<br>
right.<br>
<br>
-- Brad<br>
<br>
--<br>
<font color="#888888">Brad Sawatzky, PhD <<a href="mailto:brads@jlab.org">brads@jlab.org</a>> -<>- Jefferson Lab / Hall C / C111<br>
Ph: 757-269-5947 -<>- Pager: 757-584-5947 -<>- Fax: 757-269-7848<br>
The most exciting phrase to hear in science, the one that heralds new<br>
discoveries, is not "Eureka!" but "That's funny..." -- Isaac Asimov<br>
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</font></blockquote></div><br><br clear="all"><br>-- <br>Matthew Posik<br>Email: <a href="mailto:posik@temple.edu">posik@temple.edu</a><br>Temple University Physics Dept.<br>Office: BA-319<br>Office #: 215-204-1331 <br>
<br>