| 4 |
|
channel and module densities are three to four times larger than in |
| 5 |
|
the other SST subsystems as shown in Table~\ref{table:Density} where |
| 6 |
|
the main parameters of the SST subsystems are |
| 7 |
< |
reported. The TIB and TID layout has been designed matching the |
| 8 |
< |
following features: simple mechanical structure; easy routing of the |
| 9 |
< |
large number of service connections (cooling, readout, controls); easy |
| 10 |
< |
component mounting in the case of the TIB non-planar (cylindrical) |
| 11 |
< |
geometry; optimization the theta (and phi?) for the TID. |
| 7 |
> |
reported. |
| 8 |
> |
The TIB and TID layout has been designed keeping in mind their complexity: |
| 9 |
> |
the mechanical structures have been simplified as much as possible, |
| 10 |
> |
while the routing of the services (cooling, readout, controls) has been |
| 11 |
> |
adapted to the very high channel density making use of all accessible |
| 12 |
> |
paths inside the detector. |
| 13 |
> |
|
| 14 |
> |
%matching the |
| 15 |
> |
%following features: simple mechanical structure; easy routing of the |
| 16 |
> |
%large number of service connections (cooling, readout, controls); easy |
| 17 |
> |
%component mounting in the case of the TIB non-planar (cylindrical) |
| 18 |
> |
%geometry; optimization the theta (and phi?) for the TID. |
| 19 |
|
|
| 20 |
|
The TIB is structured in four concentric layers. Each layer is |
| 21 |
|
split along the vertical plane at $z=0$ into two almost identical half-layers. Each |
| 22 |
|
half-layer is further split along the horizontal at $y=0$ into two semi-cylindrical |
| 23 |
< |
structures, also referred to as ``shells''. The shell structure is a |
| 23 |
> |
structures, also referred to as ``shells''. |
| 24 |
> |
Both spilts in $\phi$ and $z$ are done ins such a way that the sensor surfaces always |
| 25 |
> |
overlap leaving no dead area when measuring high momentum charged particles coming |
| 26 |
> |
from the interaction region. |
| 27 |
> |
The shell structure is a |
| 28 |
|
semi-cylindrical carbon fiber assembly strenghten by two circular |
| 29 |
< |
flanges at both ends. Modules and services are hold either on |
| 30 |
< |
the external and the internal surfaces. The services are laid down on |
| 29 |
> |
flanges at both ends. To decrease their density and to provide a better accessibility |
| 30 |
> |
during integration, modules and services are hold |
| 31 |
> |
either on the external and the internal surfaces. The services are laid down on |
| 32 |
|
the surface and run parallel to the $z$ axis. |
| 33 |
|
% on the surface toward the end (i.e. in the |
| 34 |
|
%direction along which $|z|$ increases). |
| 39 |
|
The TID is split into six disks (three per each side of |
| 40 |
|
TIB). The disk is made up by three sub-disks called "rings" since each |
| 41 |
|
ring holds modules at the same radius. The ring structure consists of |
| 42 |
< |
a mechanical support made of an annular carbon fiber honeycomb, |
| 43 |
< |
hosting modules and services on both sides to decrease the density |
| 44 |
< |
and therefore providing a better accessibility during ring integration |
| 45 |
< |
and disk assembly. |
| 42 |
> |
a mechanical support made of an annular carbon fiber honeycomb. |
| 43 |
> |
Also in this case modules and services are located on both sides |
| 44 |
> |
of the mechanical structure. |
| 45 |
> |
%to decrease the density |
| 46 |
> |
%and therefore providing a better accessibility during ring integration |
| 47 |
> |
%and disk assembly. |
| 48 |
|
|
| 49 |
< |
As a result of the above described structure the TIB/TID system is |
| 50 |
< |
divided into two physically separated structures, one located in the |
| 49 |
> |
The TIB/TID system is physically |
| 50 |
> |
divided into two separated structures, one located in the |
| 51 |
|
$z > 0$ region and one located in the $z < 0$ region and known as |
| 52 |
|
TIB/TID+ and TIB/TID- respectively. Each TID+ and TID- is obtained by |
| 53 |
< |
inserting, positioning and fixing each disk into a carbon fiber |
| 53 |
> |
inserting, positioning and fixing the three disks into a carbon fiber |
| 54 |
|
cylinder called {\it Service Cylinder}. Each Service Cylinder has |
| 55 |
< |
several holes at the position of disk, in order to allow the |
| 55 |
> |
several holes at the disk positions; this allow the |
| 56 |
|
connection of the power lines and to route out all the fibers of the |
| 57 |
|
disk. The Service Cylinder is also used to connect mechanically TIB+/- |
| 58 |
|
and TID+/-, and to route out the services of the TIB and of the TID. |
| 68 |
|
is shown in Fig.~\ref{fig:module_cooling}). |
| 69 |
|
|
| 70 |
|
The TIB and TID substructures, 16 shells and 18 rings, are relatively |
| 71 |
< |
large-sized: shells hold 135 to 216 modules, rings hold 40 to 48 modules. |
| 71 |
> |
large-sized objects: one shell holds 135 to 216 modules, one ring holds 40 to 48 modules. |
| 72 |
|
Some other relevant specifications of the TIB and TID substructures are |
| 73 |
|
summarized in Table~\ref{table:layers}. |
| 74 |
|
A finished half of the TIB and a TID Disk are shown in |
| 95 |
|
\hskip 3cm |
| 96 |
|
\includegraphics[height=0.35\textwidth]{Figs/TID-disk.pdf} |
| 97 |
|
\end{center} |
| 98 |
< |
\caption{A R1 TID ting assembled (left panel) and one TID disk (right panel).} |
| 98 |
> |
\caption{A TID ring 1 assembled (left panel) and one complete TID disk (right panel).} |
| 99 |
|
\label{fig:tid} % Give a unique label |
| 100 |
|
\end{figure} |
| 101 |
|
|
| 139 |
|
& structures & circuits & layer & total & per module & Rings & Cables \\ |
| 140 |
|
\hline |
| 141 |
|
% \hline |
| 142 |
< |
TIB L1 & 4 shells & & DS & & & & \\ |
| 143 |
< |
TIB L2 & 4 shells & & DS & & & & \\ |
| 144 |
< |
TIB L3 & 4 shells & & SS & & & & \\ |
| 145 |
< |
TIB L4 & 4 shells & & SS & & & & \\ |
| 142 |
> |
TIB L1 & 4 shells & 12 & DS & 672 & 768 & 24 & 112 \\ |
| 143 |
> |
TIB L2 & 4 shells & 16 & DS & 864 & 768 & 32 & 144 \\ |
| 144 |
> |
TIB L3 & 4 shells & 12 & SS & 540 & 512 & 12 & 180 \\ |
| 145 |
> |
TIB L4 & 4 shells & 16 & SS & 648 & 512 & 16 & 216 \\ |
| 146 |
|
TID R1 & 6 rings & 24 & DS & 288 & 768 & 12 & 48 \\ |
| 147 |
|
TID R2 & 6 rings & 24 & DS & 288 & 768 & 12 & 48 \\ |
| 148 |
|
TID R3 & 6 rings & 24 & SS & 240 & 512 & 12 & 48 \\ |
| 180 |
|
\centering |
| 181 |
|
\includegraphics[width=0.6\textwidth]{Figs/module_cooling.pdf} |
| 182 |
|
\caption{Module Cooling. |
| 183 |
< |
\textbf{Upper picture:} a whole cooling loop with six ledges to hold three modules and three |
| 184 |
< |
smaller ledges to hold Analog Opto-Hybrids (two more cooling loops are partially visible). |
| 183 |
> |
\textbf{Upper picture:} part of a cooling loop with six ledges to hold three modules and three |
| 184 |
> |
smaller ledges to hold Analog Opto-Hybrids (adjacent cooling circuits are partially visible). |
| 185 |
|
\textbf{Lower picture:} a detail of a cooling loop. The cooling fluid direction |
| 186 |
< |
is evidenced with blue arrows, and the precision insets for module insertion are circled in |
| 186 |
> |
is evidenced with blue arrows, and the precision holes for module insertion are circled in |
| 187 |
|
red. A module mounted on the nearby position is also visible.} |
| 188 |
|
\label{fig:module_cooling} |
| 189 |
|
\end{figure} |
