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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Figure 59: Strip dimensions <strong>for</strong> <strong>GEM</strong> prototype GE1/1.<br />
Figure 60: The electrical characteristics <strong>of</strong> <strong>GEM</strong> prototype GE1/1.<br />
<strong>the</strong> readout ASIC. The front-end ASIC used to readout this chamber was <strong>the</strong> VFAT2 chip (capable <strong>of</strong> reading 128<br />
ch<strong>an</strong>nels per chip) requiring 8 chips to readout all ch<strong>an</strong>nels. The interstrip capacit<strong>an</strong>ce was measured at 37pF <strong>an</strong>d<br />
<strong>the</strong> strip to ground pl<strong>an</strong>e at 11.7pF giving a total capacitive load <strong>of</strong> approximately 59pF <strong>for</strong> each ch<strong>an</strong>nel.<br />
6.2.2 The front-end ASIC development - VFAT2 to VFAT3 <strong>an</strong>d GdSP<br />
The functional requirements on <strong>the</strong> system (<strong>an</strong>d indeed <strong>the</strong> front-end ASIC) are to provide both triggering <strong>an</strong>d<br />
tracking in<strong>for</strong>mation. These are similar basic requirements to that needed <strong>for</strong> <strong>the</strong> TOTEM [32] experiment currently<br />
using <strong>the</strong> VFAT2 [33] chip to readout both silicon <strong>an</strong>d gas detectors. The VFAT2 chip is hence <strong>the</strong> front-end readout<br />
chip <strong>of</strong> choice <strong>for</strong> initial prototype systems using <strong>the</strong> large <strong>GEM</strong> detectors. The need to operate at very high particle<br />
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