- Timestamp:
- 02/19/05 14:18:15 (20 years ago)
- Location:
- trunk/MagicSoft/TDAS-Extractor
- Files:
-
- 3 edited
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trunk/MagicSoft/TDAS-Extractor/Calibration.tex
r6585 r6623 5 5 pulse shapes and intensities with the MAGIC LED Calibration Pulser Box \cite{hardware-manual}. 6 6 \par 7 The LED pulser system is able to provide fast light pulses of 3--4\,ns FWHM8 with intensities ranging from 3--4 to more than 500 photo-electrons in one inner photo-multiplier of the7 The LED pulser system is able to provide fast light pulses of 2--4\,ns FWHM 8 with intensities ranging from 3--4 to more than 600 photo-electrons in one inner photo-multiplier of the 9 9 camera. These pulses can be produced in three colours {\textit {\bf green, blue}} and 10 10 {\textit{\bf UV}}. … … 23 23 Green & 520 & 40 & 6 & 120 & yes & 3--4 \\ 24 24 \hline 25 Blue & 460 & 30 & 6 & 500 & yes & 3--4 \\25 Blue & 460 & 30 & 6 & 600 & yes & 3--4 \\ 26 26 \hline 27 27 UV & 375 & 12 & 3 & 50 & no & 2--3 \\ … … 36 36 figures~\ref{fig:pulseexample1leduv} and~\ref{fig:pulseexample23ledblue} show exemplary pulses 37 37 as registered by the FADCs. 38 Whereas the UV-pulse is very stable, the green and blue pulses show sometimessmaller secondary38 Whereas the UV-pulse is rather stable, the green and blue pulses can show smaller secondary 39 39 pulses after about 10--40\,ns from the main pulse. 40 One can see that the verystable UV-pulses are unfortunately only available in such intensities as to40 One can see that the stable UV-pulses are unfortunately only available in such intensities as to 41 41 not saturate the high-gain readout channel. However, the brightest combination of light pulses easily 42 42 saturates all channels in the camera, but does not reach a saturation of the low-gain readout. … … 81 81 \end{figure} 82 82 83 We used data taken on the 7$^{ th}$ of June, 2004 with different pulser LED combinations, each taken with83 We used data taken on the 7$^{\mathrm{th}}$ of June, 2004 with different pulser LED combinations, each taken with 84 84 16384 events. 19 different calibration configurations have been tested. 85 The corresponding MAGIC data run numbers range from nr. 31741 to 31772. These data wastaken85 The corresponding MAGIC data run numbers range from nr. 31741 to 31772. These data have been taken 86 86 before the latest camera repair access which resulted in a replacement of about 2\% of the pixels known to be 87 87 mal-functioning at that time. … … 144 144 \centering 145 145 \includegraphics[width=0.95\linewidth]{Outlier.eps} 146 \caption{Example of an event classified as `` un-calibrated''. The histogram has been obtained146 \caption{Example of an event classified as ``outlier''. The histogram has been obtained 147 147 using the digital filter (extractor \#32) applied to a high-intensity blue pulse (run 31772). 148 The event marked as ``outlier'' clearly has been mis-reconstructed. It lies outside the 5 sigma 149 region from the fitted mean.} 148 The event marked as ``outlier'' clearly has been mis-reconstructed. It lies outside the 5$\sigma$--region from the fitted mean.} 150 149 \label{fig:outlier} 151 150 \end{figure} … … 206 205 less pixels than the corresponding ``fixed window''-ones (extractors \#1--16). 207 206 208 The spline (extractors \#23--27) and the digital filter with the correct weights (extractors \#30-3 3) discard207 The spline (extractors \#23--27) and the digital filter with the correct weights (extractors \#30-31) discard 209 208 the least number of pixels and are also robust against slight modifications of the pulse form 210 209 (of the weights for the digital filter). … … 212 211 Concerning the numbers of outliers, one can conclude that in general, the numbers are very low never exceeding 213 212 0.1\% except for the amplitude-extracting spline which seems to mis-reconstruct a certain type of events. 214 It seems however that the spline algorithm extracting the amplitude of the signal produces an over-proportional215 213 \par 216 214 In conclusion, already this first test excludes all extractors with too large window sizes because … … 276 274 This has to do with the fact that 277 275 the fixed window extractors fail to catch a significant part of the (larger) pulse because of the 278 1~FADC slice event-to-event jitter. Also the sliding windows smaller than 6 FADC slices and the spline smaller than 276 1~FADC slice event-to-event jitter and the larger pulse width covering about 6 FADC slices. 277 Also the sliding windows smaller than 6 FADC slices and the spline smaller than 279 278 2 FADC slices reproduce too small numbers of photo-electrons. Moreover, the digital filter shows a small dependency 280 279 of the number of photo-electrons w.r.t. the extration window. … … 334 333 by the secondary pulses, except for the digital filter. 335 334 \par 336 The extractor {\textit{\bf MExtractTimeAndChargeDigitalFilter}} seems to be s table against modifications inthe335 The extractor {\textit{\bf MExtractTimeAndChargeDigitalFilter}} seems to be sufficiently stable against modifications of the 337 336 exact form of the weights in the high-gain readout channel since all applied weights yield about 338 the same number of photo-electrons and the same ratio of outer vs. inner pixels, except if one applies the cosmics 339 weights to the very low-intensity pulse $1\,LED\,UV$ where a slight increase in photo-electrons is observed. 337 the same number of photo-electrons and the same ratio of outer vs. inner pixels. 340 338 \par 341 339 All sliding window and spline algorithms yield a stable ratio of outer vs. inner pixels in the high and the low-gain. … … 346 344 not correct. All sliding window algorithms seem to reproduce the correct numbers if one takes into 347 345 account the after-pulse behaviour of the light pulser itself. The digital filter seems to be 348 stable against changing the pulse width from 1~to~4\,ns. 346 stable against modifications of the intrinsic pulse width from 1~to~4\,ns. This is the expected range within which the pulses from 347 realistic cosmics signals may vary. 349 348 350 349 \clearpage -
trunk/MagicSoft/TDAS-Extractor/MAGIC_signal_reco.tex
r6542 r6623 17 17 \usepackage{url} 18 18 \usepackage{mdwlist} 19 \usepackage{lscape} 19 20 20 21 \setlength{\parindent}{0cm} -
trunk/MagicSoft/TDAS-Extractor/Results.tex
r6603 r6623 67 67 test, without being among the best. \no\ means that the extractor has severely failed the test and should 68 68 not be taken because of that reason. \best\ means that the extractor(s) have come out as best of the particular test.} 69 \label{tab:result} 69 70 } 70 \label{tab:result}71 71 \end{table} 72 72
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