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\section{The Silicon Strip Tracker Assembly}
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\label{sec:assembly}
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From the contruction point of view the different tracker sub-detectors are organized in
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the following way. \\
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TOB is assembled inserting 'rods' into a mechanical structure which holds them and supports
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their services. Rods have half of the TOB lenght and are inserted half from the 'z+ side'
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(called TOB+) and half from the 'z- side' (TOB-). The TOB services are routed outside of its
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volume from the two flanges where fibres, pipes and cables are $90^\circ$ tilted
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towards the tracker support tube where they are fixed and routed outside of the tracker at its
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two ends.\\
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The TIB is divided into two completely independent parts: TIB+ and TIB-. Each shell is conected
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with an identical one to build a complete cylinder (Layer); then the four TIB layers are
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inserted one into the other starting from outside to inside. The TIB services exit the
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detector volume from the external flange, they are routed radially toward the TIB Layer 4
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anf then bent on the TID service cylinder up to the patch panel (called 'Margherita').\\
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Three mechanically separated rings are assembled together to form a TID disk; three disks are
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inserted in a carbon fibre cylinder which hold them together with thee TID services.
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The preassembled TID+/- is attached to the TIB+/- and it is also used as support for all
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the services. \\
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When each TIB/TID half detector is assembled and validated, it is inserted into the TOB.
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Then it is connected to the fiber ribbons, pipes and power cables which are routed outside the
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Tracker Support Tube following the path of the TOB ones.\\
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TEC disks are made by 'petals'. Also in this case the services run on a TEC disk towards the
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Tracker Support Tube where they follow the same path. Two TEC (also called TEC+ and TEC-)
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are inserted in the Support Tube when the barrel part is assembled.\\
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