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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, and plan to employ software tools
such as BERT to assess the MDT system reliability.
Possible radiation damage is a serious concern. A preliminary
evaluation indicated that the radiation levels would be
sufficiently low that no special precautions would be required,
however new information 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:
- Rad-Hard process for IC's on front-end board. This is quite
unattractive due to the additional cost and development effort.
- Remote mounting of electronics in high-radiation levels.
Current data shows that the dose falls off very rapidly
with decreasing , so the channels in question could be mounted
on cables a short distance from the end of the MDTs. Preliminary
calculations show that this would not excessively degrade front-end
- Periodic replacement of electronics in high-radiation areas.
- Rad-Tolerant processing for IC's on front-end board. It has
been suggested that the use of specially tailored design
rules might significantly increase the radiation tolerance of standard
Thu Oct 10 18:19:00 METDST 1996