AO System Design

Opto-Mechanical Design

LOWFS and HOWFS Design

Real-Time Control Design

non-Real-Time Control Design

Acquisition System Design

Alignment, Calibration, and Diagnostics Design

Opto-Mechanical Design

Meeting Minutes

• April 21, 2009
• May 5,2009
• June 2, 2009
• June 9, 2009
• June 18, 2009
• June 23, 2009
• June 30, 2009
• July 17, 2009
• July 21, 2009
• July 29, 2009
• Aug 5, 2009
• Aug 11, 2009
• Aug 18, 2009
• Aug 25, 2009
• Sept 1, 2009
• Sept 8, 2009
• Sept 15, 2009
• Sept 22, 2009
• Sept 29, 2009
• Oct 6, 2009
• Oct 20, 2009

Documents

Organized in chronological order as the design develops

Drawings of current AO system

• Top-view layout of Keck II AO system placemat.pdf
• DualStarModule

Links to Conceputal Design Phase Materials (AKA system design phase)

• NGS and LGS Acquisition Camera (March 2008)
• Calibration and Diagnostics Design (March 2008)

Designs originating in Conceptual Design Phase

• Zemax file Cascaded relay, 2-tier carried over from conceptual design phase
• Powerpoint slide Cascaded relay, 2-tier carried over from conceptual design phase

• Zmax file Cascaded relay, 1-tier 140mm DM carried over from conceptual design phase
• Powerpoint slide Cascaded relay, 1-tier 140mm DM carried over from conceptual design phase

Single Relay concepts

• Zemax file Single relay design with 25mm MEMs DM
• Powerpoint slide Single relay design with 25mm MEMs DM

• Zemax file Single relay design with 200mm DM (48 actuator, 5mm pitch)
• Powerpoint slide Single relay design with 200mm DM (48 actuator, 5mm pitch)

• Zemax file Single relay design with 168mm DM (48 actuators, 3.5mm pitch), separate tip/tilt
• Powerpoint slide Single relay design with 168mm DM (48 actuators, 3.5mm pitch), separate tip/tilt

Cascaded Relay and Switchyard Concept that avoids the dichroics between relays

2-tier, 100 mm beam in 1st relay

• Zemax file Cascaded-relay design, 2-tier, 100mm DM, avoiding dichroic changer.
• Powerpoint slide Cascaded-relay design, 2-tier, 100mm DM, avoiding dichroic changer.

1-tier, 140 mm beam in 1st relay

• Zemax file Cascaded-relay design, 1-tier, 140mm DM, avoiding dichroic changer.
• Powerpoint slide 140mm DM cascaded relay with no dichroic changer.

Pickoff switchyard details (valid for either 1st relay option)

• Powerpoint slide Pickoff switchyard design
• White-board drawing of focal plane pick-offs switchyard concept, with LOWFS and 2nd relay of cascade sandwiched between the LOWFS. This is roughly to scale as drawn on the board (see the 12-inch ruler in the picture).
• SolidWorks e-drawing of 2-tier layout and pickoff switchyard. (delete the enclosure to see the optics)

1-tier, 100mm beam in 1st relay Passes 120 arcsecond tip/tilt star field.

Version 1

• Zemax file Cascaded relay design, 1-tier, 100mm DM, 120: field with no dichroic changer.
• Powerpoint slide Cascaded relay design, 1-tier, 100mm DM, 120" field with no dichroic changer.

Version 2

Flipped the second relay around, per Chris' request. Added NGS WFS and assumed one science instrument, with ability to add more.

• Zemax file Cascaded-relay design 1-tier, 100mm DM, no dichroic changer, proper orientation
• Powerpoint slide Cascaded relay design, 1-tier, 100mm DM cascaded relay of 120" FOV, no dichroic changer, proper orientation

Version 3

Expanded the second relay field to 40 arcseconds, first relay still 120 arcseconds. Also cleaned up some cooridinate breaks and folds.

• Zemax file Cascaded-relay design, 1-tier, 100mm DM, 2nd relay passes 40"

Version 4

Added acquisition camera pickoff for LOWFS and interferometer feed dichroic beamsplitter. Added FSM to NGS WFS feed.

• Zemax file Cascaded relay design, 1-tier, 100mm woofer, 120" field, acq. camera and interferometer feed included
• Powerpoint slide Cascaded relay design, 1-tier, 100mm woofer, 120" field, acq camera and interferometer feed included

Version 5

2nd relay NGS WFS field expanded to accomodate 40'x60' rectangular patrol field, centered on-axis. This required: 2nd relay OAPs increased in size by 30%, switchyard mirror moved back toward OAP4, incident angle of switchyard mirror increased to 20 degrees.

• Zemax file 5/11/09 version of KNGAO relay
• Snapshot of KNGAO relay design, as of 6/1/09:
  

• OSMs_in_NGAO_F.P..pdf: OSMs in the focal plane of the first relay.

Version 6

Alternative suggested layout for easier feeds to the LGS WFS and the Keck Interferometer

• Zemax file as of 7/7/09
• Session file as of 7/7/09
• 

Version 7

4 August, 2009 Same as version 5, but with the following adjustments:

1. Moved first fold mirror closer to 200mm closer to K-mirror
2. moved LGS dichroic 150mm closer to woofer DM (but didn't change angle - do I need to?)
3. increased angle of interferometer dichroic to 25 degrees
4. removed interferometer FSM pair
5. moved acq camera pick-off 100mm closer to LOWFS focus
6. decreased angle of acq camera pick-off to 45 degrees
7. removed NGS WFS FSM pair
8. moved NGS dichroic 100mm closer to science focus

• KNGAO_1-tier_100mm_120arcsec_straightthru_2nd-relay_wtelescope_v7.ZMX

• interferometer_options.pdf: Looking at options for feeding the interferometer.

* kngao_relay_v7.JPG:

• PDR_relay_design_v3.doc: 14 July, 2009 version of design document. Includes preliminary tolerance analysis
• AO Relay Design Document
• Zemax file containing 5/11/09 version of KNGAO relay.
• Opto-Mechanical e-drawing of AO relays on Nasmyth platform 6/9/09
• picture of AO relays on Nasmyth platform 6/9/09
• AO relays on Nasmyth platform, design as of 6/18/09:
  
• AO relays, some mounts shown, design as of 6/30/09:
  
• 7013-01_Keck_TELESCOPE_ASSEMBLY,_K2_NGAO.EASM: Latest Assembly Drawing - showing whole telescope, Nasmyth, AO bench, instruments - 6/18/09

Tools

Throughput and Emissivity Calculator

Throughput and Emissivity Calculation spreadsheet tool and supporting data

• ThroughputEmissivity_v6.xls: Just science path, with trade study of cooled vs uncooled options
• ThroughputEmissivity_v7.xls: Version that includes LGS WFS and LOWFS paths
• ThroughputEmissivity_v8_(version_1).xls: June, 2009 update of throughput and emissivity calculator
• Link to Antonin Bouchez's analysis of background and transmission, KAON 501
• ThroughputEmissivityStudy.ppt: Report on cooled vs uncooled option trade study