Index: trunk/MagicSoft/TDAS-Extractor/Pedestal.tex =================================================================== --- trunk/MagicSoft/TDAS-Extractor/Pedestal.tex (revision 6285) +++ trunk/MagicSoft/TDAS-Extractor/Pedestal.tex (revision 6286) @@ -1,3 +1,3 @@ -\section{Criteria for an Optimal Pedestal Extraction \label{sec:pedestals}} +\section{Pedestal Extraction \label{sec:pedestals}} \ldots {\it In this section, the distinction is made between: @@ -23,5 +23,4 @@ (eq.~\ref{eq:autocorr}), where the diagonal elements give what is usually denoted as the ``Pedestal RMS''. - \par @@ -63,7 +62,4 @@ For the normal image cleaning, knowledge of $B$ is sufficient and the error $R$ should be known in order to calculate a correct background probability. - -\par -\ldots {\textit{\bf THOMAS SCHWEIZER ???}} \par Also for the model analysis $B$ and $R$ are needed if one wants to keep small @@ -131,14 +127,16 @@ \end{enumerate} -\subsubsection{ \label{sec:determiner} Determine $R$ by Applying the Signal Extractor to a Fixed Window +\subsubsection{ \label{sec:determiner} Application of the Signal Extractor to a Fixed Window of Pedestal Events} By applying the signal extractor to a fixed window of pedestal events, we -determined the parameter $R$ for the case of no signal ($ST = 0$). In the case of +determine the parameter $R$ for the case of no signal ($ST = 0$). In the case of all extractors using a fixed window from the beginning (extractors nr. \#1 to \#22 -in section~\ref{sec:algorithms}), the results are thus by construction the same as calculating +in section~\ref{sec:algorithms}), the results are thus the same by construction as calculating the mean and the RMS of a same (fixed) number of FADC slices (the conventional ``Pedestal Calculation''). - +\par +In MARS, this possibility is implemented with a function-call to +{\textit{\bf MJPedestal::SetExtractionWithExtractorRndm()}}. \par In the case of the amplitude extracting spline (extractor nr. \#23), we placed the @@ -155,5 +153,5 @@ \begin{enumerate} \item Closed camera and no (Poissonian) fluctuation due to photons from the night sky background -\item The camera pointing to a galactic region with stars in the field of view +\item The camera pointing to an extra-galactic region with stars in the field of view \item The camera illuminated by a continuous light source of high intensity causing much higher pedestal fluctuations than in usual observation conditions. @@ -199,5 +197,6 @@ \vspace{\floatsep} \includegraphics[height=0.29\textheight]{MExtractTimeAndChargeDigitalFilter_Weights_cosmics_weights.dat_Range_00_18_02_14_Run_38995_Signal_Pixel200.eps} -\caption{MExtractTimeAndChargeDigitalFilter: Distribution of extracted "pedestals" from pedestal run with galactic star background for one channel.} +\caption{MExtractTimeAndChargeDigitalFilter: Distribution of extracted "pedestals" from pedestal run with +extra-galactic star background for one channel.} \label{fig:df:distped:run38995} \vspace{\floatsep} @@ -217,5 +216,5 @@ \includegraphics[height=0.27\textheight]{MExtractTimeAndChargeDigitalFilter_Weights_cosmics_weights.dat_Range_01_14_02_14_Run_38995_RelMean.eps} \caption{MExtractTimeAndChargeDigitalFilter: Difference in mean pedestal (per FADC slice) from pedestal -run with galactic star background (in photo-electrons)} +run with extra-galactic star background (in photo-electrons)} \label{fig:df:relmean:run38995} \vspace{\floatsep} @@ -239,5 +238,5 @@ \caption{MExtractTimeAndChargeDigitalFilter: Difference pedestal RMS (per FADC slice) with extraction algorithm appied on a fixed window, and simply summing up the same number of FADC slices. - from pedestal run with galactic star background for inner (left) + from pedestal run with extra-galactic star background for inner (left) and outer (right) pixels. } \label{fig:df:relrms:run38995} @@ -261,5 +260,5 @@ \includegraphics[height=0.29\textheight]{MExtractTimeAndChargeSpline_Amplitude_Range_00_10_04_11_Run_38995_Signal_Pixel200.eps} \caption{MExtractTimeAndChargeSpline with amplitude: Distribution of extracted "pedestals" from pedestal run -with galactic star background for one channel.} +with extra-galactic star background for one channel.} \label{fig:amp:distped:run38995} \vspace{\floatsep} @@ -281,5 +280,5 @@ \caption{MExtractTimeAndChargeSpline with amplitude: Difference in mean pedestal (per FADC slice) with extraction algorithm appied on a fixed window, and simply summing up the same number of FADC slices -Pedestal run with galactic star background.} +Pedestal run with extra-galactic star background.} \label{fig:amp:relmean:run38995} \vspace{\floatsep} @@ -304,5 +303,5 @@ \caption{MExtractTimeAndChargeSpline with amplitude: Difference pedestal RMS (per FADC slice) with extraction algorithm appied on a fixed window, and simply summing up the same number of FADC slices. -Pedestal run with galactic star background for inner (left) +Pedestal run with extra-galactic star background for inner (left) and outer (right) pixels.} \label{fig:amp:relrms:run38995} @@ -327,5 +326,5 @@ \includegraphics[height=0.27\textheight]{MExtractTimeAndChargeSpline_Rise-and-Fall-Time_0.5_1.5_Range_01_10_02_12_Run_38995_RelMean.eps} \caption{MExtractTimeAndChargeSpline with integral over 2 slices: Difference in mean pedestal (per FADC slice) -Pedestal run with galactic star background.} +Pedestal run with extra-galactic star background.} \label{fig:int:relmean:run38995} \vspace{\floatsep} @@ -346,5 +345,5 @@ \includegraphics[height=0.25\textheight]{MExtractTimeAndChargeSpline_Rise-and-Fall-Time_0.5_1.5_Range_01_10_02_12_Run_38995_RMSDiff.eps} \caption{MExtractTimeAndChargeSpline with integral over 2 slices: Difference pedestal RMS (per FADC slice) - from pedestal run with galactic star background for inner (left) + from pedestal run with extra-galactic star background for inner (left) and outer (right) pixels (in photo-electrons).} \label{fig:amp:relrms:run38995} @@ -358,15 +357,36 @@ +\subsubsection{ \label{sec:determiner} Application of the Signal Extractor to a Sliding Window +of Pedestal Events} + +By applying the signal extractor to a sliding window of pedestal events, we +determine the bias $B$ and the error $R$. +\par +In MARS, this possibility is implemented with a function-call to +{\textit{\bf MJPedestal::SetExtractionWithExtractor()}}. + +\begin{figure}[htp] +\centering +\includegraphics[height=0.4\textheight]{SinglePheRatio-28-Run38995.eps} +\caption{MExtractTimeAndChargeDigitalFilter: Fit to the ratio of the area beneath the pedestal peak and +the single photo-electron(s) peak(s) with extraction algorithm +applied on a sliding window of different sizes. +A pedestal run with extra-galactic star background has been taken and one exemplary pixel (Nr. 100). +A rate of 0.07 phe/ns has been obtained.} +\label{fig:df:ratiofit:run38995} +\vspace{\floatsep} +\includegraphics[height=0.4\textheight]{SinglePheRatio-28-Run39258.eps} +\caption{MExtractTimeAndChargeDigitalFilter: Fit to the ratio of the area beneath the pedestal peak and +the single photo-electron(s) peak(s) with extraction algorithm +applied on a sliding window of different sizes. +A pedestal run with galactic star background has been taken and one exemplary pixel (Nr. 100). +A rate of 0.09 phe/ns has been obtained.} +\label{fig:df:ratiofit:run39258} +\end{figure} + + %%% Local Variables: %%% mode: latex %%% TeX-master: "MAGIC_signal_reco" -%%% TeX-master: "MAGIC_signal_reco" -%%% TeX-master: "MAGIC_signal_reco" -%%% TeX-master: "MAGIC_signal_reco." -%%% TeX-master: "MAGIC_signal_reco" -%%% TeX-master: "Pedestal" -%%% TeX-master: "MAGIC_signal_reco" -%%% TeX-master: "MAGIC_signal_reco." -%%% TeX-master: "MAGIC_signal_reco" %%% End: