Anode front-end electronics for the cathode strip chambers of the CMS Endcap Muon detector

Abstract

The front-end electronics system for the anode signals of the CMS Endcap Muon cathode strip chambers has about 183000 channels. The purposes of the anode front-end electronics are to acquire precise muon timing information for bunch crossing number identification at the Level-1 muon trigger system and to provide a coarse radial position of the muon track. Each anode channel consists of an input protection network, amplifier, shaper, constant-fraction discriminator, and a programmable delay. The essential parts of the electronics include a 16-channel amplifier-shaper-discriminator ASIC CMP16 and a 16-channel ASIC D16G providing programmable time delay. The ASIC CMP16 was optimized for the large cathode chamber size (up to 3 x 2.5 m 2 ) and for the large input capacitance (up to 200 pf). The ASIC combines low power consumption (30 mW/channel) with good time resolution (2 -3 ns). The delay ASIC D16G makes possible the alignment of signals with an accuracy of 2.2 ns. This note presents the anode front-end electronics structure and results of the preproduction and the mass production tests, including radiation resistance and reliability tests. The special set of test equipment, techniques, and corresponding software developed and used in the test procedures are also described.

The CMS experiment at the CERN LHC

“…Depending on chamber size, there are 12 to 42 AFEBs per chamber. Further details on the AFEB design and performance can be found elsewhere [151].…”

Gaseous Radiation Detectors

“…Systems of large MWPCs named cathode strip chambers (CSC) are used for triggering and localization in the CMS end-cap muon detector at CERN's LHC. Built with sizes up to 3.4 m  1.5 m, the chambers have rigid supporting cathode planes manufactured with copper-clad, 1.6 mm thick fibreglass plates; radial readout strips are milled directly on the panels (Acosta et al, 2000;Ferguson et al, 2005). While a single layer time resolution is not sufficient to identify the Figure 8.51 Light MWPC construction, making use of expanded polyurethane plates and thin frames for holding the anode wires (Bouclier et al, 1974).…”

ME1/1 cathode strip chambers for CMS experiment

“…There are four CFEBs on the wide part of a chamber and one on the narrow part. Signals from the anode wires are ampliˇed and discriminated by the Anode Front End Boards (AFEB) [12]. Each AFEB reads out 16 wire groups from 2 layers of the CSC.…”