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

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

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?

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