A GEM Detector System for an Upgrade of the CMS Muon Endcaps

5.5 Assembly laboratory (TIF - Tracker Integration Facility, building 186)
TIF (Fig. 54) is a laboratory located at CERN Meyrin site in building 186. It has one of the largest clean rooms
(class 10000) and is planned to be used for assembly the Triple-GEMs for stations GE1/1 and GE2/1.
Figure 54: Building 186 view.
In Fig. 55 is shown the tentative plan of the assembly laboratory which is part of the big clean room. For GEi/1
project we have 90m 2 from the total laboratory area. It has special entrance access needed for the clean room
conditions and also a big transport portal suitable for big transportation needs for materials and chambers deliveries.
Figure 55: TIF clean room view.
We intend to host two main activities: production and testing. We have several tables and cupboards needed those
purposes, for istance we have two optical tables large enough to fit the full size detector as shown in Fig. 55.
For future production and QC procedures in building 186 there are ten gas lines to be installed (Fig. 56) which
will provide: Ar, CO2, CF4, N, Ar/CO2 premixed and five additional spare lines. All the gas cylinders will be
placed outside the building where there is the delivery gas point. To connect the external gas point to the lab ten
stainless steel gas pipes of 10mm and an exhaust line of 22mm are foreseen. Inside the lab there will be the main
gas distribution panel from which the gas supply will be provided to six small panels across the lab.
GEM foils will be handled in the TIF clean room to avoid any contact with dirty environment. The detector
assembly will be performed following a new solution which is simple and cost-effective, imperative for a largescale
production. The self-stretching technique is described in Section 3.
The TIF assembly facility will host the GEM assembly and the quality control of each assembled detector.
Once detectors are assembled gain uniformity measurements will be performed to validate the chamber response
using a cosmic stand facility, before the chambers will be transported to CMS for installation.
Similar facilities exist in some participating institutes and once approved, detailed plan and sharing of work for
large scale production will be drawn out.
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