BCal Beam Test Plots, April 10, 2007

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Cell 7:

  • Walk Corrections

Bcal timewalk n7 3.gifBcal timewalk s7 3.gif



  • 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 )


Bcal time res 7 3.gif

Cell 8:

  • Time walk

Bcal timewalk n8 3.gifBcal timewalk s8 3.gif

  • Time resolution

Bcal time res 8 3.gif

Cell 9:

  • Time walk

Bcal timewalk n9 3.gifBcal timewalk s9 3.gif

  • Time Resolution

Bcal time res 9 3.gif

Cell 10:

  • Time walk

Bcal timewalk n10 3.gifBcal timewalk s10 3.gif


  • Time resolution

Bcal time res 10 3.gif

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