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

Cost for components for 3·10 chamber (single and super): The estimated cost of the main electronics elements
for a single chamber is shown in Table 9.
Table 9: Estimated costs of the electronics components for a single chamber
Element No. of elements Cost/element ($) Cost/element (CHF) Cost per GEM
Single Chamber (CHF)
GdSP/VFAT3 30 78 69 2070
DC/DC reg. 7 80 90 632
GBT 3 88.6 100 300
Optical Link 3 265.8 300 900
Cables 2 886 1000 2000
Total 5902
All the estimates are very preliminary and subject to change as their individual developments projects advance.
Having made the cost estimate for a single GEM chamber. It is now straight forward to calculate the estimated
cost for a Super Chamber and then for a system. A Super chamber is essentially a double sided single chamber
and simply has double the components except for the cables. Hence the table for a super chamber is as in Table 10
Table 10: Estimated costs of the electronics components for a super chamber.
Element No. of elements Cost/element ($) Cost/element (CHF) Cost per GEM
Super Chamber (CHF)
GdSP/VFAT3 60 78 69 4140
DC/DC reg. 14 80 90 1264
GBT 6 88.6 100 600
Optical Link 6 265.8 300 1800
Cables 2 886 1000 2000
Total 9804
6.6.2 Off-detector: components for aµTCA crate
For the off-detector electronics, we plan to use standardµTCA crates which can host up to 12 double width AMCs,
such as the GLIB. The GLIB board, equipped with a mezzanine, can receive data from up to 8 optical links.
Table 11 shows the cost estimate of the different components that will be used for the off-detector electronics. All
the estimates are very preliminary and subject to change as their individual developments projects advance.
Table 11: Cost of the off-detector components
Component Cost (CHF)
GLIB/AMC 2500
µTCA crate 6200
Assuming the architecture B for the off-detector Electronics, a possible arrangement would be that one µTCA
crate receive the data from a 10 ◦ sector of GE1/1 and GE2/1. After data compression the data coming from three
µTCA crates corresponding to 3 subsequent 10 ◦ sectors would be transmitted through a fast link to a fourthµTCA
crate that would receive the data from a 30 ◦ sector of RE3/1, RE3/2, RE4/1 and RE4/2. On this crate the data
from a high-η 30 ◦ sector would then be processed by a GemTB and local ghost-busting as well as the sorting of
trigger candidates could be performed. Table 13 shows the cost estimate for a 30 ◦ sector equipped with single
GEM chambers.
For super chambers, one additional GLIB board per crate would be needed to handle the additional optical links.
Table 13 shows the cost estimate for a 30 ◦ sector equipped with super chambers.
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