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The ATLAS on-detector electronics must operate for about ten years with little or no maintenance. This requires a careful evaluation of possible sources of failure and the consequences of those failures. We have started a study of failure modes based on techniques described in the literature[8], and plan to employ software tools such as BERT[9] to assess the MDT system reliability.

Possible radiation damage is a serious concern. A preliminary evaluation[2] indicated that the radiation levels would be sufficiently low that no special precautions would be required, however new information[10] suggests that in the first muon super-layer at there may be radiation levels high enough to damage standard CMOS ICs. If this proves to be true, there are several possible solutions:

Eric Hazen
Thu Oct 10 18:19:00 METDST 1996