AO System Design

Opto-Mechanical Design

LOWFS and HOWFS Design

Real-Time Control Design

Supervisory Control Design

Acquisition System Design

Alignment, Calibration, and Diagnostics Design

Link to Opto-Mechanical Mini-Design Review

• November 17, 2009

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
• Optical Relay Mini-Review
• Jan 12, 2010
• Jan 19, 2010
• Interfaces Workshop Feb 18-19, 2010
• March 16,2010
• March 23, 2010
• April 6, 2010

Documents

Organized in chronological order as the design develops

Keck Primary Mirror Projected on Deformable Mirrors

• 1410-CM0010 Primary Mirror Proj

Drawings of current AO system

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

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:

Version 9

12 Jan 2009

Version 9 was produced as a result of some mechanical interference issues, to change the pupil image size on the MEMs tweeter mirror (to 24mm diameter), and fix some telecentricity errors in version 7. Version 9 also has an interferometer feed that is not too different from the existing DSM bench.

The largest change is opening the off-axis angles of the first relay OAPs from 20 to 25 degrees. The first fold mirror angle was adjusted until the LOWFS feed was roughly perpendicular to the telescope optical axis. The LGS WFS dichroic angle was adjusted slightly. The tweeter mirror incidence angle was lowered to 9 degrees in order to have a little more space between the science instrument and the LOWFS assembly. The NGS WFS FSMs were returned.

• KNGAO_100mmpupil_120arcsecRelay_v9.ZMX
• KNGAO_relay_version_9.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
• 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
  

16 Feb 2010

• Design Document (KAON 685) - design documentation as of 10/17/2009
• e-drawing of design as of 2/16/2010

Top View - chief rays:

Top View - populated (top LOWFS dewar removed):

Detail - switchyard:

Interfaces Workshop

Face-to-face meeting at Caltech, 2/17 - 2/18 2010, to work out interface details.
Meeting objectives:

• Mounting of 2nd relay optics in the LOWFS pickoff area
  • Working directory
• Mounting and field steer into the NGS WFS
• Placement of and switching the beam to a 2nd instrument
• Location of cold space enclosure walls

• NGAO_2nd_relay_reni_1_fewer_fold_shorter_bfd.JPG:
  

• NGAO_2nd_relay_1_sph_2_oae_2nd_pupil_tweeter_telecentric_output_fold_right.JPG:
  

Version 10

18 March 2010

Version 10 Incorporates the following changes:

• Feeding two instrument ports with the switchyard mirror after OAP4.
• Folded LGS WFS feed to put the LGS WFS on the left side of the Nasmyth (if looking into the bulkhead), while the instruments are on the right.
• Incorporated the NGS WFS feed into the collimated space before OAP4 (instead of after OAP4), and refocus light with a triplet lens design by Viswa.
• Opened tweeter mirror from 9 degrees it was in version 9 to the 10 degrees it was pre-version 9.

* KNGAO_100mmpupil_120arcsecRelay_v10.ZMX: AO relay design, as of 18 March, 2010

12 May 2010

* AO_Bench_051210.EASM: AO Bench edrawing model as or 12 may 2010

* AO_Bench_051210.EASM.jpg:

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

• PDR_NGAO_relay_v5.doc: PDR design doc as of 5/19/2010