Changeset 814 for trunk/ICRC_01/mccontrib.tex

Timestamp:

05/29/01 19:09:22 (23 years ago)

Author:

blanch

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• trunk/ICRC_01/mccontrib.tex (modified) (6 diffs)

trunk/ICRC_01/mccontrib.tex

@@ -40 +40 @@
 \section{Introduction}
 
-In this year the construction of the the $17~\mathrm{m}$ diameter
+In this year the construction of the $17~\mathrm{m}$ diameter
 Che\-ren\-kov telescope called MAGIC \cite{mc98}
 will be finished. The aim of this
@@ -127 +127 @@
 %
 For each simulated shower all
-Cherenkov photons hitting the groud at observation level 
-close to the telesope position are stored.
+Cherenkov photons hitting the ground at observation level 
+close to the telescope position are stored.
 
 \subsection{mirror simulation}
@@ -211 +211 @@
 Due to the big mirror surface the light from the stars around 
 the position of an expected gamma ray source is contributing to 
-the noise in the camera. We developed a program that allows use
+the noise in the camera. We developed a program that allows us
 to simulate the star light together with the generated shower. 
 This program takes all stars in the field of view of the camera
@@ -306 +306 @@
 check the influence of the three above-mentioned variables.
 
-\begin{figure}[h]
- \vspace*{2.0mm} % just in case for shifting the figure slightly down
- \includegraphics[width=8.3cm]{enerthres.eps} % .eps for Latex,
-                                            % pdfLatex allows .pdf, .jpg, .png and .tif
- \caption{Caption text}
- \label{fig_enerthres}
-\end{figure}
-
 For both, gammas and protons, some different background conditions 
 have been simulated (without any background light, diffuse light, 
 and light from Crab Nebula field of view). The results pointed out 
 that there is not any variation of the energy threshold inside our 
-error in determining the maximum that is few GeV for gammas, It is 
+error, which is few GeV, in determining the maximum. It is 
 worth to remember that this is based only in first level trigger. 
 Most likely there will be some effects when one enters the second 
@@ -324 +316 @@
 
 Magic will do observations in a large range of zenith angles, 
-therefore is worth to studie the energy threshold as function of 
-the zenith angle. In figure three it is shown for 0, 5 and 10 degrees.
+therefore is worth to study the energy threshold as function of 
+the zenith angle. In figure \ref{fig_enerthres}, it is shown for 0, 5 
+and 10 degrees. Even though larger statistic is needed, the energy 
+threshold increases slowly with the zenith angle.
+\begin{figure}[hb]
+ \vspace*{2.0mm} % just in case for shifting the figure slightly down
+ \includegraphics[width=8.3cm]{enerthres.eps} % .eps for Latex,
+                                            % pdfLatex allows .pdf, .jpg, .png and .tif
+ \caption{On the left upper plot the Energy Threshold for diffrent zenith angles is plotted while on the left bottom plot the Energy Threshold is plotted for several values of the trigger discriminator threshold. On the right plot a characteristic fit for $dN/dE$ is shown (for showers at $10^\circ$ with discriminator at 4 mV and diffuse NSB of 0.09 photo electrons per ns and pixel)}
+ \label{fig_enerthres}
+\end{figure}
 
 If one lowers the threshold of the trigger discriminator, then less 
@@ -331 +332 @@
 And it helps the low energy showers to fulfil the required trigger 
 conditions. In figure  \ref{fig_enerthres} one can see that the threshold 
-energy decreases  while lowering the discriminator. It is 25 GeV for 3 mV 
+energy decreases  while lowering the discriminator. It is 29 GeV for 3 mV 
 and 105 GeV  for 7 mV. Since one of the aims of the Telescope is lowering as 
 much as possible the energy threshold, a low discriminator value is 
 preferred. But for 3 mV the expected rate due to protons increases a 
-lot (see section 3.1.3), while it keeps under control at 4 mV. 
-Therefore, the threshold of the discriminator would be keep above 
+lot (see section ~\ref{sec-rates}), while it keeps under control at 4 mV. 
+Therefore, the threshold of the discriminator would be kept above 
 4 mV, which yields a energy threshold of 45 GeV.
 
-\subsubsection{Expected rates}
+\subsubsection{Expected rates}\label{sec-rates}
 
 Using the monte carlo data sample, it is possible to estimate