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1.4 Electromagnetic Compatibility

A system is electromagnetically compatible if it does not cause interference with itself or other systems and it is not susceptible to other systems. Although signal integrity is a part of EMC, it will be treated separately in this thesis to show the arrangement of my time as a doctoral student at CERN. My first year at CERN was mainly devoted to signal-integrity issues. I was involved in the noise performance, grounding, and shielding of the TRT in the second part.

EMC distinguishes degradation sources, receptors, and the coupling paths. To ensure EMC either the disturbing emissions of the source or the susceptibility of the receiver has to be reduced, or the path has to be removed.

For the TRT, the most obvious victims of possible noise sources are the straws, the sensitive preamplifier of the ASDBLR, and the LAr calorimeter. Possible aggressors are the digital DTMROC chip, the services of the TRT end cap and the TRT barrel, the SCT, and the services of the SCT and the PIXEL. Due to the small distances from one sub-detector to the next one, capacitive coupling will be the main coupling path. Another main concern of the ATLAS detector is the topic of ground loops.

February 9, 2000 - Martin Mandl
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