Difference between revisions of "BCal Beam Test Plots, April 10, 2007"
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(→Cell 8:) |
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==Cell 8:== | ==Cell 8:== | ||
*Time walk | *Time walk | ||
| − | [[Image:Bcal timewalk n8 3.gif|360px]][[Image:Bcal timewalk s8 3.gif|360px]] | + | [[Image:Bcal timewalk n8 3.gif|"North 8"|360px]][[Image:Bcal timewalk s8 3.gif|"South 8"|360px]] |
*Time resolution | *Time resolution | ||
Revision as of 12:18, 10 April 2007
Contents
Cell 7:
- Walk Corrections
- cuts: Nphotons==1 && abs(tn7+tphoton-531) <10 && s7>200
- fit: [0]*exp([1]*x)+[2]+[3]*x = (exponential + constant + linear)
- Time resolution
In the 4 plots below (similarly for the other cells), time difference between the mean time of the cell and the tagger is shown as a function of photon energy as reported by the tagger.
(tn8+ts8)/2.0 - (-tphoton) - 531
The top plot (black dots) has no timewalk corrections applied. The 2nd plot (red dots) has the timewalk correction functions applied to each of the tubes. The 3rd plot shows the sigmas resulting from fitting slices of the top 2 histograms to gaussians for each x-bin. This indicates the timing resolution as a function of incident photon energy with(red) and without(black) timewalk corrections applied to each of the TDC signals. The bottom plot is a fit to the 3rd plot(red dots) fitting the function
sqrt( (p0/sqrt(E[GeV]))^2 + (p1)^2 )
Cell 8:
- Time walk
- Time resolution
Cell 9:
- Time walk
- Time Resolution
Cell 10:
- Time walk
- Time resolution
