1. NGAO Uptime Budget Keck NGAO Meeting #2 Tuesday, November 14, 2006
Erik Johansson

2. Roadmap to an uptime budget
Review Keck AO statistics
Currently have LGS AO stats
Looking for NGS AO stats
If not currently summarized, derive from Metrics database
Attempt to get uptime statistics from other institutions
Remove outliers
Failures with large downtimes that can be avoided in NGAO, e.g.:
K2 Laser timing board failure with no spares
K2 WFC crashes
K2 Laser failures may not apply to NGAO laser(s)
Use remaining statistics as a starting point for a budget
Iterate and fine tune

3. Review of Keck II LGS AO uptime statistics
Major contributors to system downtime:
AO Faults
Laser Faults
Other Faults (instrument + telescope)
Space Command (?)
Spotters (?)
Laser traffic control (?)
Should all these categories be considered as downtime?

5. Conclusions
Not all current Keck failures/downtime will map directly to NGAO
Primary downtime drivers will be laser and AO system reliability
Need to break down AO and Laser faults into finer granularity to draw more and better conclusions