Difference between revisions of "First look at TOF data from Fall 2014"
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|[[Image:run2209_dt_plane0_paddle19.gif|x200px| Delta t right-left 20th paddle paddle]] | |[[Image:run2209_dt_plane0_paddle19.gif|x200px| Delta t right-left 20th paddle paddle]] | ||
|[[Image:run2209_dt_plane0_paddle21.gif|x200px| Delta t right-left 22nd paddle paddle]] | |[[Image:run2209_dt_plane0_paddle21.gif|x200px| Delta t right-left 22nd paddle paddle]] | ||
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| + | Looking at the fit result for all PMTs and plot the peak value of the landau gives the following result: | ||
| + | {|boarder="0" cellpadding="2" | ||
| + | |[[Image:mpvs_run2209.gif|x200px| Landau peak distribution for all PMTs in the TOF detector]] | ||
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Revision as of 14:36, 1 February 2015
TOF DATA
All the data are from run 2209. At first a raw look at the TDC times of all the PMTs:
The next two images shows the number of samples used to calculate the integral of the Signal and an example pedestal:
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First look at ADC data from Paddle 1, 19, 20 22 of Plane 0. These paddles are double ended readout 252cm long and 6cm wide (1, 19) or 3cm wide (22) or the short paddle single ended readout (22). The plots show the raw ADC spectrum in blue with out any cuts while the red curve shows only hits that are generated in the center by cutting on the time difference between the two ends. The cut is +/- 1ns which is about +/- 16cm. Note these spectra are pedestal subtracted.
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The landau peak is clearly identifiable between ADC 2000 and 4000. The following plots show a fit to the 19th and 20th paddle pmt0. The fit function is a landau convoluted with a Gaussian. Note that the width of the Gaussian is basically zero meaning that the convolution with a Gaussian is not necessary, which means that the photon statistics is not relevant, in other words: there is plenty of light.
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The cut on the central part of the paddle was done using the time difference between left/right PMT. And even though this is physically impossible for paddle 22 and 23 there are still left/right coincidences seen.
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Looking at the fit result for all PMTs and plot the peak value of the landau gives the following result:
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