Changeset 6641 for trunk/MagicSoft/TDAS-Extractor

Timestamp:

02/20/05 20:03:28 (20 years ago)

Author:

gaug

Message:

*** empty log message ***

Location:

trunk/MagicSoft/TDAS-Extractor

Files:

• MAGIC_signal_reco.tex (modified) (2 diffs)
• MonteCarlo.tex (modified) (1 diff)
• Pulpo.tex (added)

trunk/MagicSoft/TDAS-Extractor/MAGIC_signal_reco.tex

@@ -37 +37 @@
 \title{Comparison of Signal Reconstruction Algorithms for the MAGIC Telescope}
 \author{H. Bartko, M. Gaug, A. Moralejo, \\
-N. Sidro, W. Wittek}
-\date{Month dd, 2004\\}
-\TDAScode{MAGIC-TDAS 04-xx\\ 04mmdd}
+Th. Schweizer, M. Shayduk, N. Sidro, W. Wittek}
+\date{February 28$^{\mathrm{th}}$, 2005\\}
+\TDAScode{MAGIC-TDAS 05-xx\\ 050228}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
@@ -69 +69 @@
 \include{Pedestal}
 \include{Calibration}
+\include{Pulpo}
 \include{MonteCarlo}
 \include{Speed}

trunk/MagicSoft/TDAS-Extractor/MonteCarlo.tex

@@ -1 +1 @@
 \section{Monte Carlo \label{sec:mc}}
+
+\subsection{Introduction \label{sec:mc:intro}}
+
+Many charasteristics of the extractor can only be investigated with the use of Monte-Carlo simulations~\cite{MC-Camera} 
+of signal pulses and noise for the following reasons:
+
+\begin{itemize}
+\item While in real conditions, the signal can only be obtained in a Poisson distribution, simulated pulses of a specific 
+number of photo-electrons can be generated.
+\item The intrinsic arrival time spread can be chosen within the simulation.
+\item The noise auto-correlation in the low-gain channel cannot be determined from data, 
+but instead has to be retrieved from Monte-Carlo studies.
+\item The same pulse can be studied with and without added noise, where the noise level can be deliberately adjusted.
+\item The photo-multiplier and optical link gain fluctuations can be tuned or switched off completely.
+\end{itemize}
+
+Nevertheless, there are always systematic differences between the simulation and the real detector. In our case, especially the 
+following short-comings are of concern:
+
+\begin{itemize}
+\item The low-gain pulse is not yet simulated with the correct pulse width, but instead the same pulse shape as the one of the 
+high-gain channel has been used.
+\item The low-gain pulse is delayed by only 15 FADC slices in the Monte-Carlo simulations, while it arrives about 16.5 FADC slices 
+after the high-gain pulse in real conditions.
+\item No switching noise due to the low-gain switch has been simulated.
+\item The intrinsic transit time spread of the photo-multipliers has not been simulated.
+\item The total dynamic range of the entire signal transmission chain was set to infinite, thus the detector has been simulated 
+to be completely linear.
+\end{itemize}
+
+For the subsequent studies, the following settings have been used: 
+
+\begin{itemize}
+\item The gain fluctuations for signal pulses were switched off.
+\item The gain fluctuations for the background noise of the light of night sky were instead fully simulated, i.e. very close to 
+real conditions.
+\item The intrinsic arrival time spread of the photons was set to be 1\,ns, as expected for gamma showers.
+\item The conversion of total integrated charge to photo-electrons was set to be 7.8~FADC~counts 
+per photo-electron, independent of the signal strength.
+\item The trigger jitter was set to be uniformly distributed over 1~FADC slice only.
+\end{itemize}
+
+In the following, we used the Monte-Carlo to determine especially the following quantities for each of the tested extractors:
+
+\begin{itemize}
+\item The charge resolution as a function of the input signal strength.
+\item The charge extraction bias as a function of the input signal strength.
+\item The time resolution as a function of the input signal strength.
+\item The effect of adding or removing noise for the above quantities.
+\end{itemize}
 
 \subsection{Charge Signals with Simulated Noise \label{sec:mc:charge}}