Changeset 5699 for trunk/MagicSoft/TDAS-Extractor

Timestamp:

01/05/05 12:44:21 (20 years ago)

Author:

gaug

Message:

*** empty log message ***

Location:

trunk/MagicSoft/TDAS-Extractor

Files:

• Changelog (modified) (1 diff)
• Introduction.tex (modified) (3 diffs)

trunk/MagicSoft/TDAS-Extractor/Changelog

@@ -19 +19 @@
 
                                                  -*-*- END OF LINE -*-*-
+
+2004/01/05: Markus Gaug
+  * Introduction.tex: Some changes in style
 
 2005/01/04: Hendrik Bartko

trunk/MagicSoft/TDAS-Extractor/Introduction.tex

@@ -5 +5 @@
 \end{itemize}
 
-The MAGIC read-out scheme, including the PMT camera, the analog-optical link, the majority trigger logic and FADCs, is schematically shown in figure \ref{fig:MAGIC_read-out_scheme}. The used PMTs provide a very fast response to the input light signal. The response of the PMTs to sub-ns input light pulses shows a FWHM of 1.0 - 1.2 ns and rise and fall times of 600 and 700 ps correspondingly \cite{Magic-PMT}. By modulating VCSEL type laser diodes in amplitude the ultra fast analogue signals from the PMTs are transferred via 162m long, 50/125 $\mu$m diameter optical fibers to the counting house \cite{MAGIC-analog-link-2}. After transforming the light back to an electrical signal, the original PMT pulse has a FWHM of about 2.2 ns and rise and fall times of about 1ns. % was 2.2 ns
+Figure~\ref{fig:MAGIC_read-out_scheme} shows a sketch of the MAGIC read-out scheme, including the PMT camera, 
+the analog-optical link, the majority trigger logic and 
+FADCs. The used PMTs provide a very fast 
+response to the input light signal. The response of the PMTs to sub-ns input light pulses shows a FWHM of 
+1.0 - 1.2 ns and rise and fall times of 600 and 700 ps correspondingly \cite{Magic-PMT}. By modulating VCSEL 
+type laser diodes in amplitude, the fast analogue signals from the PMTs are transferred via 162\,m long, 
+50/125\,$\mu$m diameter optical fibers to the counting house \cite{MAGIC-analog-link-2}. After transforming the 
+light back to an electrical signal, the original PMT pulse has a FWHM of about 2.2 ns and rise and fall 
+times of about 1\,ns. % was 2.2 ns
 
 %an analog optical link \ci
@@ -15 +23 @@
 \includegraphics[width=\textwidth]{Magic_readout_scheme1.eps}
 \end{center}
-\caption[Current MAGIC read-out scheme.]{Current MAGIC read-out scheme: the analog PMT signals are transferred via an analog optical link to the counting house where after the trigger decision the signals are digitized by using a 300 MHz FADCs system and written to the hard disk of a DAQ PC.} \label{fig:MAGIC_read-out_scheme}
+\caption[Current MAGIC read-out scheme.]{Current MAGIC read-out scheme: the analog PMT signals are 
+transferred via an analog optical link to the counting house where after the trigger decision the signals 
+are digitized by using a 300 MHz FADCs system and written to the hard disk of a DAQ PC.} 
+\label{fig:MAGIC_read-out_scheme}
 \end{figure}
 
@@ -23 +34 @@
 
 
-In order to sample this pulse shape with the used 300 MSamples/s FADC system, the pulse is stretched to a FWHM $>6$ ns (the original pulse is folded with a stretching function of 6ns). Because the MAGIC FADCs have a resolution of 8 bit only, the signals are split into two branches with different gains by a factor of 10. One branch is delayed by 50 ns and then both branches are multiplexed and consecutively read-out by one FADC. % The maximum sustained trigger rate could be 1 kHz. The FADCs feature a FIFO memory which allows a significantly higher short-time rate.
+In order to sample this pulse shape with the used 300 MSamples/s FADC system, the pulse is shaped to a 
+FWHM greater than 6\,ns 
+(the original pulse is folded with a stretching function of 6ns). Because the MAGIC FADCs have a 
+resolution of 8 bit only, the signals are split into two branches with gains differing by a factor 10. 
+One branch is delayed by 55\,ns and then both branches are multiplexed and consecutively read-out by one FADC.
+Figure~\ref{fig:pulpo_shape_high} shows a typical average of identical input signals.
+% The maximum sustained trigger rate could be 1 kHz. The FADCs feature a FIFO memory which allows a significantly higher short-time rate.
 % Obviously by doing this, more LONS is integrated and thus the performance of the telescope on the analysis level is degraded. 
+
+\par
+
+\ldots {\textit{STILL MISSING:} \ldots
+\begin{itemize}
+\item DAQ jumps
+\item clock noise
+\end{itemize}
+
+} \ldots