\begin{sidewaysfigure}
	\centering
%	\def\svgwidth{21cm}\input{Images/pdf/na62/na62_schematics_h.pdf_tex}
	\includegraphics[width=21cm]{Images/pdf/na62/na62_schematics_full_h}\vspace*{1cm}
	\caption{Schematic view of the NA62 detector.}
	\label{img:na62-schematics}
\end{sidewaysfigure}

The NA62 experiment is located at the CERN-SPS North area, on the beam line originally used by the NA48 experiment. The NA62 collaboration devised a new experimental apparatus on the basis of the NA48 experience \cite{2007NIMPA.574..433N}.\\

An unseparated 750 \si{\mega\hertz} beam composed by protons, pions and a fraction of 6\% $K^+$ is produced by the collision of a 400 \si{\giga\electronvolt/\textit{c}} proton beam on a Beryllium target. The fiducial decay region begins approximately 100 \si{m} downstream of the target, and ends 70 \si{\meter} farther, where the downstream detectors are located.\\

Three sub-detectors placed upstream of the decay region monitor the incoming beam conditions. Beam kaons are identified by the \textit{CEDAR}, a \v{C}erenkov Differential counter with Achromatic Beam focus. The \textit{GTK} (Gigatracker) subdetector, a beam spectrometer composed by three stations of silicon micro-pixels, provides a precise measurement of the beam kaons momentum, direction and time. Finally, the \textit{CHANTI} (Charged-Anti) scintillator rings that surround the last layer of the GTK veto large-angle charged particles before they enter the decay region.\\

Large-angle photon vetoes (\textit{LAV}) surround the cylindrical walls of the vacuum chambers that host the decay region. Together with the downstream electromagnetic calorimeters, they ensure a photon rejection inefficiency smaller than $10^{-8}$ in a 50 \si{\milli\radian} cone around the $z$ axis (i.e. the initial direction of the kaon beam) \cite{na62-tdr}.\\
%the solid angle defined by a 50 \si{\milli\radian} cone around the $z$ axis \cite{na62-tdr}.\\

Decay vertex, direction of flight and momentum of the charged decay products are measured by a straw chambers spectrometer (\textit{STRAW}) and a \textit{RICH}, namely Ring Imaging \v{C}erenkov detector. The RICH is also used to provide $\pi$--$\mu$ discrimination in the $15 \leq P_z \leq 35$ \si{\giga\electronvolt/\textit{c}} region, where $P_z$ is the pion/muon momentum along the $z$ axis.\\

A segmented scintillation hodoscope (\textit{CHOD}) provides fast trigger signals for charged particles just after they emerge from the RICH vessel. Downstream, three calorimeters provide small-angle photon veto. The \textit{LKr} (Liquid Krypton) detector is an electromagnetic calorimeter which can also provide a selective $e^+$/$e^-$ trigger by measuring the energy deposit and the shape of the electromagnetic showers developed in its volume. An intermediate ring-shaped calorimeter (\textit{IRC}) and the small-angle electromagnetic calorimeter (\textit{SAC}) add photon suppression in the region not covered by the geometric acceptance of the LKr. In particular, a dipole magnet is installed in order to bend charged beam particles away from the $z$ axis, so that only forward photons can hit the SAC.\\

Suppression of the $K^+ \rightarrow \mu^+ \nu_\mu$ background requires fast and hermetic muon vetoing. A scintillator system (\textit{MUV3}) detects muons emerging from an 80 \si{\centi\meter} thick iron block. Two additional muon-veto stations are provided by the \textit{MUV1} and \textit{MUV2} calorimeters, used to distinguish muons from hadrons by measuring the energy released and the shape of the hadronic showers initiated by the particle that has to be identified.\\

A longitudinal view of the experimental setup devised by the NA62 collaboration is shown in \figurename~\ref{img:na62-schematics}. For clarity, I will divide the sub-detectors into two subsets: the beam detectors, upstream of the decay region, and the downstream detectors, used to detect and characterize the decay products.
% those upstream of the decay region, used to monitor the $K^+$ and the remaining content of the beam, and those downstreams, which are used to detect and characterize the decay products.

%\begin{figure}
%	\centering
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%	\input{Images/pdf/na62/na62_schematics_vert.pdf_tex}
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%	\label{lat-1}
%\end{figure}