Transcript PowerPoint

Design Team Report:
Laser Facility
Chris Neyman
Jim Bell, Erik Johansson, Jason Chin
W. M. Keck Observatory
Viswa Velur
Caltech Optical Observatories
Keck NGAO Team Meeting #12
December 13, 2007
Videoconference
Agenda
• New Lead
– Transition from Chin to Neyman
• Status of WBS elements
• Plan for finishing
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WBS 3.3 Laser
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3.3.1 Laser Architecture
3.3.2 Laser Enclosure
3.3.3 “Laser”
3.3.4 Laser Launch Facility
3.3.5 Laser safety
3.3.6 Control system (See Non RTC talk this meeting)
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WBS 3.3.1 Laser Architecture
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Down selection to a “feasible” design based on our current
understanding of available lasers and associated technologies
– Not necessary final design or best design
– Based on original estimate of LGS return from wavefront error budget
– Details on AOSystemDesign TWiki at:
http://www.oir.caltech.edu/twiki_oir/pub/Keck/NGAO/AOSystemDesign/NGAO_Preliminary_Conceptual_Laser_Architecture_v1_3.doc
– Selected Architecture
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2 SOR type CW lasers 75W each
– Circular polarization
– D2a and D2b pumping
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Free space optical relay
Laser heads mounted on elevation ring
Power supplies mounted on Nasmyth platform
Launch telescope behind secondary mirror
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WBS 3.3.2 Laser Enclosure
Requirements updated
Jim Bell working on enclosure design
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WBS 3.3.3 the “Laser”
Updated laser requirement
Draft report on expected laser return by Velur and Dekany should be
finalized soon
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WBS 3.3.4 Laser Launch
Free space beam propagation
Based on current K1 LGS
Design for flexibility in laser power and number LGS
See Cartoon next page
Concept needs to be verified and specifications documented
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Add cartoon of beam transport system
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WBS 3.3.5 Laser safety
Based on current procedure and practices at Keck
See related linked documents at:
http://www.oir.caltech.edu/twiki_oir/bin/view.cgi/Keck/NGAO/AOSystemDesign
Sufficient to show “feasibility” for system design
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Completion of WBS 3.3.Laser
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To do:
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Finalize baseline power and operating margin (VV, RD, etc.)
Complete beam transport design (CN, JB)
Complete enclosure design (JB)
Close out design in early 08
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