Changeset 6708 for trunk/MagicSoft/TDAS-Extractor/Calibration.tex

Timestamp:

03/02/05 20:40:43 (20 years ago)

Author:

gaug

Message:

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File:

• trunk/MagicSoft/TDAS-Extractor/Calibration.tex (modified) (2 diffs)

trunk/MagicSoft/TDAS-Extractor/Calibration.tex

@@ -584 +584 @@
 \label{fig:linear:phevschargearea3}
 \end{figure}
+
+\clearpage
+
+\subsection{High-Gain vs. Low-Gain Calibration \label{sec:cal:hivslo}}
+
+The High-gain vs. Low-gain calibration is performed with events which on the one side do not yet 
+saturate the high-gain channel, and on the other side are intense enough to trigger the low-gain switch 
+in the electronics. Assuming that the signal reconstruction bias is negligible in any low-gain event 
+(see also chapter~\ref{sec:mc}), one can then build the ratio of the reconstructed signal from the high-gain
+channel vs. the one reconstructed from the low-gain channel. 
+\par
+For the following tests, we applied the following criteria:
+
+\begin{itemize}
+\item The content of the FADC slice with the largest signal has to be greater than 200 FADC counts
+\item The content of the FADC slice with the largest signal has to be smaller than 245 FADC counts
+\end{itemize}
+
+One of the used calibration runs (run \# 31762, \textit{\bf 1\,Led\,Blue}}) 
+was especially apt to test the high-gain vs. low-gain 
+inter-calibration of the reconstructed signals since there, the two requirements were fulfilled by 
+more than 100~pixels in a reasonable number of events such that enough statistics could be accumulated.
+\par
+
+Figure~\ref{fig:ratio:sliding} shows some of the obtained results for all pixels with enough statistics: 
+The results obtained with two spline algorithms and with two digital filter initializations are plotted 
+against those obtained with a sliding window over 8 FADC slices in high-gain and low-gain. One can see that 
+there is a rather good correlation for: 
+
+\begin{figure}[htp]
+\centering
+\includegraphics[width=0.45\linewidth]{Ratio-21vs25.eps}
+\includegraphics[width=0.45\linewidth]{Ratio-21vs27.eps}
+\includegraphics[width=0.45\linewidth]{Ratio-21vs28.eps}
+\includegraphics[width=0.45\linewidth]{Ratio-21vs32.eps}
+\caption{Distributions of the calibrated high-gain vs. low-gain signal ratio, calculated with one test extractor
+vs. a reference extractor (sliding window over 8 high-gain and 8 low-gain FADC slices, extractor \#21). 
+The tested extractors are: top left: integrating spline over 0.5 FADC slices left from maximum and 1.5 
+FADC slice right from maximum (extrator \#25), top right: integrating spline over 1.5 FADC slices left 
+from maximum and 4.5 FADC slices right from maximum (extractor \#27), bottom left: digital filter fitting
+cosmics pulses over 6 FADC slices, bottom left: digital filter fitting a blue calibration pulse over 
+6 FADC slices.}
+\label{fig:ratio:sliding}
+\end{figure}
+
+\begin{figure}[htp]
+\centering
+\includegraphics[width=0.45\linewidth]{Ratio-28vs29.eps}
+\includegraphics[width=0.45\linewidth]{Ratio-32vs33.eps}
+\caption{Distributions of the calibrated high-gain vs. low-gain signal ratio, calculated with the 
+digital filter. For the values on x-axis the integration over 6 FADC slices has been applied, for those 
+one the y-axis, the integration over 4 FADC slices. Left: Digital filter fitting
+cosmics pulses, right: Digital filter fitting a blue calibration pulse.}
+\label{fig:ratiovsdf
+\end{figure}
+
 
 \clearpage
@@ -994 +1050 @@
 %%% mode: latex
 %%% TeX-master: "MAGIC_signal_reco"
+%%% TeX-master: "MAGIC_signal_reco"
 %%% End: