Investigations and Repairs

This page is intended to be a reference for past and ongoing issues regarding base failures, investigations, and repairs.

Bases continue to experience HV failure at a rate of ~1 new base per day.
High temperature (in the ballpark of 35-40 C) is correlated with base HV failure. The cause and effect nature of is still not entirely clear at this point.
- ONGOING: A setup in CEBAF can externally heat up to 12 bases to ~35 C at present. Currently this can only run during daytime hours. Over three eight hour periods no HV failures were seen among 12 recently removed from FCAL bases. Jon intends to investigate for a few days at 40 C before drawing conclusions.

From Feb-April 8 2016 nine bases had severe communications issues. These bases were addressed both individually and together with all other bases on strand. They gave no responses back for a matter of days. Power cycling via software controls did not help. However, when removed from the FCAL these bases appear to respond just fine (no long term monitoring has been performed yet).
- TO DO: Check to see if these bases can still receive messages. This is most easily done by seeing if the base in question can receive an LED ON command.

A set of interconnected issues: electrical arcing occurs inside some bases when back plates are touching. Jon has experienced electrical shock from touching back plates as well. When back plates are not touching no problems occur (arcing happens on order of seconds, no problems when not touching for over 12 hours).

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