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\section{Introduction}
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\label{sec:Introduction}
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%\section{The Silicon Strip Tracker Layout}
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%\label{sec:Layout}
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The CMS~\cite{ref:CMS} Silicon Strip Tracker
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(SST)~\cite{ref:ssttdr,ref:sstaddendum}
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covers the radial range between $20\cm$ and $110\cm$ around the LHC
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interaction point (Fig. \ref{fig:layout}).
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The barrel region ($| z | < 110\cm$\footnote{A CMS
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coordinate system, used through this note, is defined in such a way
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that $z$ is the coordinate along the LHC beam axis, $y$ is the
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vertical direction and $x$ complete the system; the origin being the
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nominal beam interaction point.})
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is split into a Tracker Inner Barrel (TIB) made of four detector
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layers, and a Tracker Outer Barrel (TOB) made of six detector
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layers. The TIB, being shorter than TOB, is complemented by three Tracker Inner Disks
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per side (TID), each Disk being in turn composed of three
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Rings. The forward and backward
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regions ($120\cm < |z| < 280\cm$) are covered by nine Tracker
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End-Cap (TEC) disks per side.
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The two innermost layers of both TIB and TOB as well as rings number one, two and five
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of TEC and one and two of TID are instrumented with double-sided
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detector modules assemblies able to provide three-dimensional position measurement of the charged
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particle hits.
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A complete description of the Silicon Tracker layout %(Fig.\ref{fig:layout})
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can be found elsewhere~\cite{ref:layout}.\\
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\begin{figure}[!htb]
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\begin{center}
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\includegraphics[width=0.85\textwidth]{Figs/rz.pdf}
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\end{center}
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\caption{Longitudinal cross section of one quarter of the CMS SST.
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Thicker (blue) segments indicate double-sided silicon microstrip modules.
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The nominal beam interaction point is located in (0,0), dimensions are in mm.
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The pseudorapidity ($\eta$) coverage is also shown.}
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\label{fig:layout} % Give a unique label
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\end{figure}
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The entire tracker is inserted in a carbon fiber Support Tube which is attached to
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the Electromagnetic Calorimeter. The tracker thermal insulation is
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guaranteed by a 'Thermal Shield'. The whole tracker region is embedded into the
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3.8~Tesla solenoidal magnetic field.
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%Charged particle transverse momentum resolution of about 1.5\% for centrally-produced
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%muon of 100~GeV/$c$ is expected~\cite{ref:ptdr}. \\
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%The CMS Tracker Inner Barrel (TIB) and Disks (TID) are in the low radius part of the Silicon Strip Tracker (SST)
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%of CMS, of which a full description can be found in
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%~\cite{ref:CMS1}\cite{ref:CMS2}.
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This note reviews the integration of the substructures in which the TIB
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and the TID are split to ease the construction,
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i.e. the mounting and the test of all components (modules, electronics
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and cables) on
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%the 16 TIB shell support structures and the 18 TID ring
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dedicated mechanical support.
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In a second phase, not covered here, these
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substructures
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%the shells and the rings
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will be assembled to build the final TIB and TID
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detector.
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The note is organized as follows: in section~\ref{sec:Introduction} the TIB
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and TID layouts are described; in section~\ref{sec:Components} an overview of the main
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TIB and TID components is given, with a particular emphasis on the items which are
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of particular relevance for the integration activities; in
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section~\ref{sec:Procedures} and section~\ref{sec:Tests}
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the integration procedures and the quality control
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tests are throughly reviewed; in section~\ref{sec:biasandvdepl} issues related to
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detector radiation resistance are discussed.
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