From 0c6b45ec896c52053028d417af864fab91335fed Mon Sep 17 00:00:00 2001
From: Eric Teunis de Boone <ericteunis@deboone.nl>
Date: Wed, 13 Sep 2023 17:20:21 +0200
Subject: [PATCH] Thesis: small work on Introduction

---
 documents/thesis/chapters/introduction.tex | 102 +++++++++++++++++----
 1 file changed, 83 insertions(+), 19 deletions(-)

diff --git a/documents/thesis/chapters/introduction.tex b/documents/thesis/chapters/introduction.tex
index 38c05d5..7e386cd 100644
--- a/documents/thesis/chapters/introduction.tex
+++ b/documents/thesis/chapters/introduction.tex
@@ -19,31 +19,82 @@ Particle type,
 Energy,
 magnetic fields -- origin,
 
+\hrule
+
+In the beginning of the 20th century, various types of radiation were discovered.
+Dubbed ``Cosmic Rays'', one type was determined to come from beyond the atmosphere.
+
+
 \subsection{Air Showers}
 \label{sec:airshowers}
 Particle cascades,
 Xmax?,
 Radio emission,
 
+\begin{figure}
+	\centering
+	\includegraphics[width=0.3\textwidth]{airshower/shower_development_depth_iron_proton_photon.pdf}
+	\caption{
+		From H. Schoorlemmer.
+		Shower development as a function of atmospheric depth for an energy of $10^{19}\eV$.
+	}
+	\label{fig:airshower:depth}
+\end{figure}
+
+\begin{figure}
+	\centering
+	\begin{subfigure}{0.47\textwidth}
+		\includegraphics[width=\textwidth]{airshower/airshower_radio_polarisation_geomagnetic.png}%
+	\end{subfigure}
+	\hfill
+	\begin{subfigure}{0.47\textwidth}
+		\includegraphics[width=\textwidth]{airshower/airshower_radio_polarisation_askaryan.png}%
+	\end{subfigure}
+	\caption{
+		From \protect \cite{Schoorlemmer:2012xpa} \protect\cite{Huege:2017bqv}
+		\protect \Todo{Krijn?}
+		Radio Emission mechanisms (left: geomagnetic, right: charge-excess)
+	}
+\end{figure}
+
 \subsection{Experiments}
 \label{sec:detectors}
+
+\begin{figure}
+	\centering
+	\includegraphics[width=0.8\textwidth]{astroparticle/The_CR_spectrum_2023.pdf}
+	\caption{
+		From \protect \cite{The_CR_spectrum}.
+		Cosmic Ray flux as a function of energy-per-nucleon.
+	}
+	\label{fig:cr_flux}
+\end{figure}
+
+
+Cosmic particles have been observed over a large range of energies.
+However, for increasing energies, their flux decreases dramatically (see Figure~\ref{fig:cr_flux}).
+To gather decent statistics at these highest energies on a practical timescale, observatories therefore have to span huge areas.
+\\
+
+\hrule
 Standalone devices,
-\gls*{PA},
+\gls*{Auger},
 AugerPrime RD,
 \gls*{GRAND},
 \gls*{LOFAR}?,
 
 
-\section{Interferometry}
+\section{Radio Interferometry}
 \label{sec:interferometry}
 Rough outline of Interferometry?
 \\
 
-Requires $\sigma_t \lesssim 1\ns$ \cite{Schoorlemmer:2020low}
 
 \begin{figure}
-	\includegraphics[width=0.5\textwidth]{radio_interferometry/Schematic_RIT_extracted.png}
-	\caption{From H. Schoorlemmer}
+	\centering
+	\includegraphics[width=0.5\textwidth]{radio_interferometry/rit_schematic_true.pdf}%
+%	\includegraphics[width=0.5\textwidth]{radio_interferometry/Schematic_RIT_extracted.png}
+%	\caption{From H. Schoorlemmer}
 \end{figure}
 
 \begin{equation}\label{eq:propagation_delay}%<<<
@@ -57,6 +108,7 @@ Requires $\sigma_t \lesssim 1\ns$ \cite{Schoorlemmer:2020low}
 
 
 \begin{figure}
+	\centering
 	\begin{subfigure}[t]{0.3\textwidth}
 		\includegraphics[width=\textwidth]{radio_interferometry/trace_overlap_bad.png}
 		\label{fig:trace_overlap:bad}
@@ -71,10 +123,22 @@ Requires $\sigma_t \lesssim 1\ns$ \cite{Schoorlemmer:2020low}
 		\includegraphics[width=\textwidth]{radio_interferometry/trace_overlap_best.png}
 		\label{fig:trace_overlap:best}
 	\end{subfigure}
-	\caption{Trace overlap due to wrong positions}
+	\caption{
+		Trace overlap due to wrong positions
+	}
 	\label{fig:trace_overlap}
 \end{figure}
 
+\begin{figure}
+	\centering
+	\includegraphics[width=0.7\textwidth]{2006.10348/fig03_b.png}%
+	\caption{
+		From \protect \cite{Schoorlemmer:2020low}.
+		$\Xmax$ resolution as a function of detector-to-detector synchronisation.
+	}
+	\label{fig:xmax_synchronise}
+\end{figure}
+
 \section{Time Synchronisation}
 \label{sec:timesynchro}
 The main method of synchronising multiple stations is by employing a \gls{GNSS}.
@@ -83,18 +147,18 @@ This system should deliver timing with an accuracy in the order of $10\ns$ \cite
 
 Need reference system with better accuracy to constrain current mechanism (Figure~\ref{fig:reference-clock}).
 
-\begin{figure}
-	\centering
-	\includegraphics[width=0.5\textwidth]{clocks/reference-clock.pdf}
-	\caption{
-		Using a reference clock to compare two other clocks.
-	}
-	\label{fig:reference-clock}
-	\todo{
-		redo figure with less margins,
-		remove spines,
-		rotate labels
-	}
-\end{figure}
+%\begin{figure}
+%	\centering
+%	\includegraphics[width=0.5\textwidth]{clocks/reference-clock.pdf}
+%	\caption{
+%		Using a reference clock to compare two other clocks.
+%		\protect \todo{
+%			redo figure with less margins,
+%			remove spines,
+%			rotate labels
+%		}
+%	}
+%	\label{fig:reference-clock}
+%\end{figure}
 
 \end{document}