A GEM Detector System for an Upgrade of the CMS Muon Endcaps
A GEM Detector System for an Upgrade of the CMS Muon Endcaps
A GEM Detector System for an Upgrade of the CMS Muon Endcaps
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B Integration <strong>an</strong>d installation within <strong>CMS</strong> high-η envelope<br />
This section describe <strong>the</strong> studies <strong>of</strong> integration <strong>an</strong>d installation <strong>of</strong> detectors <strong>an</strong>d services at <strong>CMS</strong>. This includes<br />
project documentation.<br />
B.1 Scope<br />
The design, dimensions <strong>an</strong>d positioning <strong>for</strong> <strong>the</strong> <strong>GEM</strong> chambers to be mounted in <strong>the</strong> YE1 nose has been studied<br />
<strong>an</strong>d preliminary results are presented in this section 6) .<br />
B.2 General description<br />
The mech<strong>an</strong>ical structure is divided into 2 circular sectors, one located in ME1/1 <strong>an</strong>d <strong>the</strong> o<strong>the</strong>r one in +ME1/1.<br />
There are 36 Super-Chambers per sector, each one covering10 ◦ <strong>of</strong> <strong>the</strong> circle. One SC is composed <strong>of</strong> 2 trapezoidal<br />
chambers. There are 2 types <strong>of</strong> SC: all chambers are strictly identical but <strong>the</strong>y are joined via 2 different types <strong>of</strong><br />
holders, this in order to match SC between <strong>the</strong>m <strong>an</strong>d to have a good overlap (6.5mm) <strong>of</strong> <strong>the</strong> active area <strong>of</strong> <strong>the</strong><br />
<strong>GEM</strong>s, while allow <strong>the</strong>m entering in <strong>the</strong> narrow space (100mm, to be confirmed if possible in <strong>the</strong> next opening <strong>of</strong><br />
<strong>the</strong> detector) existing between <strong>the</strong> Back-Fl<strong>an</strong>ge <strong>an</strong>d <strong>the</strong> <strong>Muon</strong> Chambers, volume where <strong>the</strong> SCs will be mounted<br />
(Fig. 78). All screws <strong>an</strong>d materials are not-magnetics. Heli-coils are not <strong>for</strong>eseeing in principle. The 3D modeller<br />
used is CATIA V5, st<strong>an</strong>dard at CERN. Few drawings have been printed <strong>for</strong> <strong>the</strong> first prototypes. Final execution<br />
drawings to be produced.<br />
B.3 Documents<br />
Table 25: <strong>System</strong> overview: Endcap disks 1<br />
GE1/1 RE1/2 RE1/3<br />
Chambers 18·2·2=72<br />
η segments 8<br />
Φ coverage 20<br />
strips/η segment 384<br />
Ch<strong>an</strong>nels/chamber 3072<br />
Table 26: <strong>System</strong> overview: Endcap 2<br />
GE2/1 RE2/2 RE2/3<br />
Chambers 36·2·2=144<br />
η segments 8<br />
Φ coverage 10<br />
strips/η segment 384<br />
Ch<strong>an</strong>nels/chamber 3072<br />
Table 27: <strong>System</strong> overview: Endcap 3<br />
GE3/1 RE3/2 RE3/3<br />
Chambers 18·2·2=72<br />
η segments 4<br />
Φ coverage 20<br />
strips/η segment 384<br />
Ch<strong>an</strong>nels/chamber 3072<br />
6) Adopted Acronyms: AD Applicable Document; PR Reference drawing; RD reference document; <strong>CMS</strong> Compact <strong>Muon</strong><br />
Solenoid Experiment; SC Super-Chamber; CoG Centre <strong>of</strong> Gravity; TBC To be confirmed; TBD To be determined; PA<br />
Applicable drawing.<br />
87
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