<br><br><div class="gmail_quote">On Wed, Mar 3, 2010 at 3:37 PM, Chiranjib Dutta <<a href="mailto:chiran@jlab.org">chiran@jlab.org</a>> wrote:<br><blockquote class="gmail_quote">
Hi David,<br>
Sorry I could not get back to you last night. I am just screwed<br>
up with all different things and I am going to Colorado<br>
tomorrow.<br>
I think your offsets look good. Now go to:<br>
<br>
/w/work5602/transversity/chiranjib/analysis/replay/DB/20081116 and then<br>
<br>
db_L.s1.dat and db_L.s2.dat<br>
<br>
I would not trust too much on the s1 database as I did not do any time<br>
offsets there. But I think I did the timewalk.<br>
<br>
S2 should be fine.<br>
<br>
Let me know if you happen to run into problems !!<br></blockquote><div><br><br>I am having a strange problem... if I check the scintillators for different momenta, it seems all good for elastic run 1229, and 20145 (p = 0.6 GeV, 5-pass -- as opposed to 4-pass that I showed you just now). <br>
<br>However, with seemingly increasing momentum, I get strange behavior (particularly in S1 time avg) -- see attached plots. Note -- beta also isn't that consistent as p changes..<br><br>This doesn't make sense to me -- I'm using the same DB file for every run, to my knowledge when I made the updates. I've seen no HV changes in the HALOG... it would make more sense to me if I saw the time offset change in S1 as well, but it's still ~ 1 or 2 ns if not 0... There are fluctuations in the time offsets if you look paddle by paddle -- but that structure in the time avg for S1 is baffling (see 20263 plots -- p = 1.42 GeV, 5-pass. If I go higher in p, the effect seems to become more and more pronounced..)<br>
<br>I originally thought this calibration should be momentum independent...<br><br><br>P.S. -- How did your interview go? If you didn't have it yet, good luck! <br></div></div><br clear="all"><br>-- <br>-----------------------------------------------------------<br>
David Flay<br>Physics Department<br>Temple University<br>Philadelphia, PA 19122 <br><br>office: Barton Hall, BA319<br>phone: (215) 204-1331<br><br>e-mail: <a href="mailto:flay@jlab.org">flay@jlab.org</a> <br> <a href="mailto:flay@temple.edu">flay@temple.edu</a><br>
<br>website: <a href="http://www.jlab.org/~flay">http://www.jlab.org/~flay</a><br> <a href="http://quarks.temple.edu">http://quarks.temple.edu</a><br>-----------------------------------------------------------<br>
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