Abstract

Data acquisition (DAQ) electronics are described for a system of high-rate cathode strip chambers (CSC) in the forward region of A Toroidal LHC ApparatuS (ATLAS) muon spectrometer. The system provides serial streams of control signals for switched capacitor array analog memories on the chambers and accepts a total of nearly 294 Gbit/s in serial raw data streams from 64 chambers in the design configuration. Processing of the data is done in two stages, leading to an output bandwidth of 2.56 Gbit/s. The architecture of the system is described, as are some important signal processing algorithms and hardware implementation details. Although designed for a specific application, the architecture is sufficiently general to be used in other contexts.

Highlights

  • A Toroidal LHC ApparatuS (ATLAS) Cathode Strip Chamber (CSC) system is designed to measure high momentum muons in the high radiation environment of the forward regions

  • Sampling and digitization are performed on-detector but are controlled by the off-detector electronics, which consists of optical transition modules and readout drivers (RODs)

  • The CSC on-detector electronics [3] resides on amplifierstorage module (ASM) boards

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Summary

THE ATLAS CSC SYSTEM

A Toroidal LHC ApparatuS (ATLAS) Cathode Strip Chamber (CSC) system is designed to measure high momentum muons in the high radiation environment of the forward regions. Due to severe radiation levels in the CSC environment, a minimum of the CSC electronics will be located on the detector in order to minimize development of custom rad-hard circuits. The on-detector electronics amplifies and shapes the cathode strip signals, and stores the pulse height information during the level 1 trigger latency. Upon receipt of a “level 1 trigger accept” (LVL1 Accept), four time samples are digitized and transmitted via high-speed fiber-optic G-Links to off-detector electronics. Sampling and digitization are performed on-detector but are controlled by the off-detector electronics, which consists of optical transition modules and readout drivers (RODs). The ROD processes the received samples in two stages. The remaining data are sent to the ATLAS Trigger/DAQ System for further processing

The On-Detector Electronics
The Off-Detector Electronics
The VME Configuration
ROD Architecture
The DSP Module
SPU Processing
RPU Processing
CONCLUSION
Full Text
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