Transcript Uptime budget presentation

California Association for Research in Astronomy
W. M. Keck Observatory
NGAO
Next-Generation Adaptive Optics System
NGAO Uptime Budget
Keck NGAO Meeting #2
Tuesday, November 14, 2006
Erik Johansson
NGAO
Next-Generation Adaptive Optics System
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
2
NGAO
Next-Generation Adaptive Optics System
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?
3
NGAO
Next-Generation Adaptive Optics System
LGS AO Downtime
155.43 hours total, from 101 nights of LGS AO
8%
0%
14%
2%
Laser traffic control
Spotters
Space Command
22%
Laser faults
AO faults
54%
Other faults (inst+tel)
4
NGAO
Next-Generation Adaptive Optics System
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
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