Mr. David J. Cowley Profile

David J. Cowley

Technical Facilities Manager at Univ of California Santa Cruz

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Author

Publications (32)

Proceedings Article | 13 December 2020 Poster + Paper

Keck Planet Finder: design updates

Steven Gibson, Andrew Howard, Kodi Rider, Arpita Roy, Jerry Edelstein, Marc Kassis, Jason Grillo, Sam Halverson, Martin Sirk, Christopher Smith, Steve Allen, Ashley Baker, Charles Beichman, Bruce Berriman, Thomas Brown, Kelleen Casey, Jason Chin, David Coutts, David Cowley, William Deich, Tobias Feger, Benjamin Fulton, Luke Gers, Yulia Gurevich, Yuzo Ishikawa, Ean James, Sharon Jelinsky, Stephen Kaye, Kyle Lanclos, Adela Li, Scott Lilley, Ben McCarney, Tim Miller, Steve Milner, Timothy O'Hanlon, Jacob Pember, Mike Raffanti, Constance Rockosi, Ryan Rubenzahl, Dave Rumph, Dale Sandford, Maureen Savage, Christian Schwab, Andreas Seifahrt, Abby Shaum, Roger Smith, Julian Stuermer, Jim Thorne, Adam Vandenberg, Tod Von Boeckmann, Cindy Wang, Qifan Wang, Marie Weisfeiler, Mavourneen Wilcox, Edward Wishnow, Peter Wizinowich, Truman Wold, Anna Wolfenberger

Proc. SPIE. 11447, Ground-based and Airborne Instrumentation for Astronomy VIII

KEYWORDS: Doppler effect, Spectroscopy, Exoplanets, Optical fabrication, Charge-coupled devices, Optical benches, Planets, CCD image sensors, Zerodur, Keck Observatory

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Proceedings Article | 10 July 2018 Presentation + Paper

Fabrication completion and commissioning of a deployable tertiary mirror for the Keck I Telescope

C. Ratliff, G. Cabak, A. Phillips, X. Prochaska, W. Deich, D. Sandford, J. Nelson, D. Cowley, A. Tripsas, M. Bolte, S. Park, M. Peck, P. Zachary, T. Wold, M. Dahler, M. Kassis, A. Vandenberg, J. Ward

Proc. SPIE. 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III

KEYWORDS: Actuators, Telescopes, Mirrors, Adaptive optics, Control systems, Computer programming, Kinematics, Collimation, Servomechanisms, Computer aided design

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Proceedings Article | 6 July 2018 Paper

Keck Planet Finder: preliminary design

Steven Gibson, Andrew Howard, Arpita Roy, Christopher Smith, Sam Halverson, Jerry Edelstein, Marc Kassis, Edward Wishnow, Michael Raffanti, Steve Allen, Jason Chin, David Coutts, David Cowley, Jim Curtis, William Deich, Tobias Feger, Daniel Finstad, Yulia Gurevich, Yuzo Ishikawa, Ean James, Elisha Jhoti, Kyle Lanclos, Scott Lilley, Tim Miller, Steve Milner, Tom Payne, Kodi Rider, Constance Rockosi, Dale Sandford, Christian Schwab, Andreas Seifahrt, Martin Sirk, Roger Smith, Julian Stuermer, Marie Weisfeiler, Mavourneen Wilcox, Adam Vandenberg, Peter Wizinowich

Proc. SPIE. 10702, Ground-based and Airborne Instrumentation for Astronomy VII

KEYWORDS: Doppler effect, Calibration, Spectroscopy, Planets, Zerodur

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Proceedings Article | 9 August 2016 Paper

Blue camera of the Keck cosmic web imager, fabrication and testing

Constance Rockosi, David Cowley, Jerry Cabak, David Hilyard, Terry Pfister

Proc. SPIE. 9908, Ground-based and Airborne Instrumentation for Astronomy VI

KEYWORDS: Optical components, Observatories, Optical design, Imaging systems, Cameras, Lens design, Optical fabrication, Optical testing, Tolerancing, Keck Observatory

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The Keck Cosmic Web Imager (KCWI) is a new facility instrument being developed for the W. M. Keck Observatory and funded for construction by the Telescope System Instrumentation Program (TSIP) of the National Science Foundation (NSF). KCWI is a bench-mounted spectrograph for the Keck II right Nasmyth focal station, providing integral field spectroscopy over a seeing-limited field up to 20" x 33" in extent. Selectable Volume Phase Holographic (VPH) gratings provide high efficiency and spectral resolution in the range of 1000 to 20000. The dual-beam design of KCWI passed a Preliminary Design Review in summer 2011. The detailed design of the KCWI blue channel (350 to 700 nm) is now nearly complete, with the red channel (530 to 1050 nm) planned for a phased implementation contingent upon additional funding. KCWI builds on the experience of the Caltech team in implementing the Cosmic Web Imager (CWI), in operation since 2009 at Palomar Observatory. KCWI adds considerable flexibility to the CWI design, and will take full advantage of the excellent seeing and dark sky above Mauna Kea with a selectable nod-and-shuffle observing mode. In this paper, models of the expected KCWI sensitivity and background subtraction capability are presented, along with a detailed description of the instrument design. The KCWI team is lead by Caltech (project management, design and implementation) in partnership with the University of California at Santa Cruz (camera optical and mechanical design) and the W. M. Keck Observatory (program oversight and observatory interfaces). The optical design of the blue camera for the Keck Cosmic Web Imager (KCWI) by Harland Epps of the University of California, Santa Cruz is a lens assembly consisting of eight spherical optical elements. Half the elements are calcium fluoride and all elements are air spaced. The design of the camera barrel is unique in that all the optics are secured in their respective cells with an RTV annulus without additional hardware such as retaining rings. The optical design and the robust lens mounting concept has allowed UCO/Lick to design a straightforward lens camera assembly. However, alignment sensitivity is a strict 15 μm for most elements. This drives the fabrication, assembly, and performance of the camera barrel.

Proceedings Article | 1 August 2016 Paper

Update on UCO's advanced coating lab development of silver-based mirror coatings

Andrew Phillips, David Fryauf, Nobuhiko Kobayashi, Brian DuPraw, Spencer Cheleden, Christopher Ratliff, Michael Bolte, David Cowley

Proc. SPIE. 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II

KEYWORDS: Oxides, Observatories, Telescopes, Mirrors, Mirrors, Silica, Silver, Coating, Reflectivity, Atomic layer deposition, Aluminum

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Proceedings Article | 15 July 2016 Paper

Detailed design of a deployable tertiary mirror for the Keck I telescope

J. Xavier Prochaska, Chris Ratliff, Jerry Cabak, Alex Tripsas, Sean Adkins, Michael Bolte, David Cowley, Mike Dahler, Will Deich, Hilton Lewis, Jerry Nelson, Sam Park, Michael Peck, Drew Phillips, Mike Pollard, Bill Randolph, Dale Sandford, Jim Ward, Truman Wold

Proc. SPIE. 9910, Observatory Operations: Strategies, Processes, and Systems VI

KEYWORDS: Telescopes, Mirrors, Astronomy, Data modeling, Sensors, Calibration, Magnetic resonance imaging, Spectroscopy, Distortion, James Webb Space Telescope

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Proceedings Article | 7 August 2014 Paper

Swimming with ShARCS: comparison of on-sky sensitivity with model predictions for ShaneAO on the Lick Observatory 3-meter telescope

Srikar Srinath, Rosalie McGurk, Constance Rockosi, Renate Kupke, Donald Gavel, Gerald Cabak, David Cowley, Michael Peck, Christopher Ratliff, Elinor Gates, Daren Dillon, Andrew Norton, Marc Reining

Proc. SPIE. 9148, Adaptive Optics Systems IV

KEYWORDS: Infrared cameras, Signal to noise ratio, Observatories, Telescopes, Mirrors, Stars, Imaging systems, Sensors, Photons, Adaptive optics

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Proceedings Article | 22 July 2014 Paper

Design development of a deployable tertiary mirror for Keck

J. Prochaska, J. Cabak, C. Ratliff, S. Adkins, M. Bolte, D. Cowley, H. Epps, J. Nelson, A. Tripsas, A. Phillips, W. Deich, M. Peck

Proc. SPIE. 9145, Ground-based and Airborne Telescopes V

KEYWORDS: Actuators, Observatories, Telescopes, Mirrors, Astronomy, Stars, Spectrometers, Adaptive optics, Kinematics, Vignetting

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Proceedings Article | 21 July 2014 Paper

Opto-mechanical design of ShaneAO: the adaptive optics system for the 3-meter Shane Telescope

C. Ratliff, J. Cabak, D. Gavel, R. Kupke, D. Dillon, E. Gates, W. Deich, J. Ward, D. Cowley, T. Pfister, M. Saylor

Proc. SPIE. 9148, Adaptive Optics Systems IV

KEYWORDS: Microelectromechanical systems, Optomechanical design, Telescopes, Mirrors, Cameras, Wavefront sensors, Adaptive optics, Deformable mirrors, Aluminum, Optical benches

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Proceedings Article | 21 July 2014 Paper

Commissioning ShARCS: the Shane adaptive optics infrared camera-spectrograph for the Lick Observatory Shane 3-m telescope

Rosalie McGurk, Constance Rockosi, Donald Gavel, Renate Kupke, Michael Peck, Terry Pfister, Jim Ward, William Deich, John Gates, Elinor Gates, Barry Alcott, David Cowley, Daren Dillon, Kyle Lanclos, Dale Sandford, Mike Saylor, Srikar Srinath, Jason Weiss, Andrew Norton

Proc. SPIE. 9148, Adaptive Optics Systems IV

KEYWORDS: Infrared cameras, Observatories, Telescopes, Optical filters, Cameras, Sensors, Adaptive optics, Image filtering, Infrared radiation, Infrared telescopes

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Proceedings Article | 18 July 2014 Paper

Progress and new techniques for protected-silver coatings

Andrew Phillips, David Fryauf, Nobuhiko Kobayashi, Michael Bolte, Brian Dupraw, Christopher Ratliff, Terry Pfister, David Cowley

Proc. SPIE. 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation

KEYWORDS: Oxides, Observatories, Telescopes, Mirrors, Silicon, Silver, Optical coatings, Reflectivity, Atomic layer deposition, Tin

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Proceedings Article | 24 September 2012 Paper

The Keck Cosmic Web Imager: a capable new integral field spectrograph for the W. M. Keck Observatory

Patrick Morrissey, Mateusz Matuszewski, Chris Martin, Anna Moore, Sean Adkins, Harland Epps, Randy Bartos, Jerry Cabak, Dave Cowley, Jack Davis, Alex Delacroix, Jason Fucik, David Hilliard, Ean James, Steve Kaye, Nicole Lingner, James D. Neill, Christoph Pistor, Drew Phillips, Connie Rockosi, Bob Weber

Proc. SPIE. 8446, Ground-based and Airborne Instrumentation for Astronomy IV

KEYWORDS: Observatories, Telescopes, Mirrors, Spectrographs, Imaging systems, Cameras, Sensors, Spectral resolution, Charge-coupled devices, Keck Observatory

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Proceedings Article | 17 September 2012 Paper

Keck 1 deployable tertiary mirror (K1DM3)

J. Xavier Prochaska, Christoph Pistor, Gerald Cabak, David Cowley, Jerry Nelson

Proc. SPIE. 8444, Ground-based and Airborne Telescopes IV

KEYWORDS: Observatories, Telescopes, Mirrors, Spectrographs, Astronomy, Stars, Spectroscopy, Spectrometers, Space telescopes, Galactic astronomy

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Proceedings Article | 13 September 2012 Paper

ShaneAO: an enhanced adaptive optics and IR imaging system for the Lick Observatory 3-meter telescope

Renate Kupke, Donald Gavel, Constance Roskosi, Gerald Cabak, David Cowley, Daren Dillon, Elinor Gates, Rosalie McGurk, Andrew Norton, Michael Peck, Christopher Ratliff, Marco Reinig

Proc. SPIE. 8447, Adaptive Optics Systems III

KEYWORDS: Observatories, Telescopes, Mirrors, Imaging systems, Cameras, Sensors, Wavefront sensors, Adaptive optics, Deformable mirrors, Laser guide stars

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Proceedings Article | 13 September 2012 Paper

Progress in UCO's search for silver-based telescope mirror coatings

Andrew Phillips, Joseph Miller, Michael Bolte, Brian DuPraw, Matthew Radovan, David Cowley

Proc. SPIE. 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II

KEYWORDS: Oxides, Observatories, Telescopes, Mirrors, Gemini Observatory, Ions, Silver, Optical coatings, Reflectivity, Thin film coatings

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Proceedings Article | 20 July 2010 Paper

Progress toward high-performance astronomical coatings

Andrew Phillips, William Brown, Brian Dupraw, David Hilyard, David Cowley

Proc. SPIE. 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation

KEYWORDS: Oxides, Telescopes, Mirrors, Antireflective coatings, Astronomy, Ions, Silver, Optical coatings, Reflectivity, Sol-gels

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Proceedings Article | 15 July 2010 Paper

The low-resolution imaging spectrograph red channel CCD upgrade: fully depleted, high-resistivity CCDs for Keck

C. Rockosi, R. Stover, R. Kibrick, C. Lockwood, M. Peck, D. Cowley, M. Bolte, S. Adkins, B. Alcott, S. Allen, B. Brown, G. Cabak, W, Deich, D, Hilyard, M, Kassis, K, Lanclos, J, Lewis, T, Pfister, A, Phillips, L, Robinson, M, Saylor, M, Thompson, J, Ward, M, Wei, C, Wright

Proc. SPIE. 7735, Ground-based and Airborne Instrumentation for Astronomy III

KEYWORDS: Observatories, Telescopes, Spectrographs, Astronomy, Sensors, Image resolution, Sensor performance, Charge-coupled devices, CCD image sensors, Current controlled current source

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Proceedings Article | 23 July 2008 Paper

Progress toward high-performance reflective and anti-reflection coatings for astronomical optics

Andrew Phillips, Joseph Miller, William Brown, David Hilyard, Brian Dupraw, Vernon Wallace, Dave Cowley

Proc. SPIE. 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation

KEYWORDS: Telescopes, Mirrors, Antireflective coatings, Silica, Silver, Optical coatings, Reflectivity, Aluminum, Sol-gels, Astronomical imaging

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Proceedings Article | 11 July 2008 Paper

The Keck-I Cassegrain ADC

Andrew Phillips, Joseph Miller, David Cowley, Vernon Wallace

Proc. SPIE. 7014, Ground-based and Airborne Instrumentation for Astronomy II

KEYWORDS: Telescopes, Antireflective coatings, Prisms, Stars, Magnesium fluoride, Silica, Optical coatings, Space telescopes, Sol-gels, Tolerancing

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Proceedings Article | 29 June 2006 Paper

The Keck-I Cassegrain atmospheric dispersion corrector

Andrew Phillips, Joseph Miller, David Cowley, Vernon Wallace

Proc. SPIE. 6269, Ground-based and Airborne Instrumentation for Astronomy

KEYWORDS: Observatories, Telescopes, Prisms, Silica, Glasses, Optical coatings, Image quality, Sol-gels, Optical instrument design, Atmospheric modeling

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Proceedings Article | 7 March 2003 Paper

The DEIMOS spectrograph for the Keck 2 Telescope: Integration and testing

Sandra Faber, Andrew Phillips, Robert Kibrick, Barry Alcott, Steven Allen, Jim Burrous, T. Cantrall, De Clarke, Alison Coil, David Cowley, Marc Davis, William Deich, Ken Dietsch, David Gilmore, Carol Harper, David Hilyard, Jeffrey Lewis, Molly McVeigh, Jeffrey Newman, Jack Osborne, Ricardo Schiavon, Richard Stover, Dean Tucker, Vernon Wallace, Mingzhi Wei, Gregory Wirth, Christopher Wright

Proc. SPIE. 4841, Instrument Design and Performance for Optical/Infrared Ground-based Telescopes

KEYWORDS: Optical components, Monochromatic aberrations, Telescopes, Mirrors, Spectrographs, Cameras, Sensors, Optical fabrication, Charge-coupled devices, Fluorescence correlation spectroscopy

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Proceedings Article | 7 March 2003 Paper

Comparison of open- vs. closed-loop flexure compensation systems for two Keck optical imaging spectrographs: ESI and DEIMOS

Robert Kibrick, Sandra Faber, Andrew Phillips, Molly McVeigh, David Cowley, Matthew Radovan, David Gilmore, Christopher Wright, Dean Tucker, De Clarke, Steven Allen

Proc. SPIE. 4841, Instrument Design and Performance for Optical/Infrared Ground-based Telescopes

KEYWORDS: Actuators, Telescopes, Mirrors, Spectrographs, Sensors, Calibration, Charge-coupled devices, Fluorescence correlation spectroscopy, Motion measurement, Camera shutters

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Proceedings Article | 7 March 2003 Paper

The CCD imaging systems for DEIMOS

Christopher Wright, Robert Kibrick, Barry Alcott, David Gilmore, Terry Pfister, David Cowley

Proc. SPIE. 4841, Instrument Design and Performance for Optical/Infrared Ground-based Telescopes

KEYWORDS: Electronics, Switches, Clocks, Sensors, Video, Power supplies, Video processing, Charge-coupled devices, Connectors, Camera shutters

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The DEep Imaging Multi-Object Spectrograph (DEIMOS) images with an 8K x 8K science mosaic composed of eight 2K x 4K MIT/Lincoln Lab (MIT/LL) CCDs. It also incorporates two 1200 x 600 Orbit Semiconductor CCDs for active, close-loop flexure compensation. The science mosaic CCD controller system reads out all eight science CCDs in 40 seconds while maintaining the low noise floor of the MIT/Lincoln Lab CCDs. The flexure compensation (FC) CCD controller reads out the FC CCDs several times per minute during science mosaic exposures. The science mosaic CCD controller and the FC CCD controller are located on the electronics ring of DEIMOS. Both the MIT/Lincoln Lab CCDs and the Orbit flexure compensation CCDs and their associated cabling and printed circuit boards are housed together in the same detector vessel that is approximately 10 feet away from the electronics ring. Each CCD controller has a modular hardware design and is based on the San Diego State University (SDSU) Generation 2 (SDSU-2) CCD controller. Provisions have been made to the SDSU-2 video board to accommodate external CCD preamplifiers that are located at the detector vessel. Additional circuitry has been incorporated in the CCD controllers to allow the readback of all clocks and bias voltages for up to eight CCDs, to allow up to 10 temperature monitor and control points of the mosaic, and to allow full-time monitoring of power supplies and proper power supply sequencing. Software control features of the CCD controllers are: software selection between multiple mosaic readout modes, readout speeds, selectable gains, ramped parallel clocks to eliminate spurious charge on the CCDs, constant temperature monitoring and control of each CCD within the mosaic, proper sequencing of the bias voltages of the CCD output MOSFETs, and anti-blooming operation of the science mosaic. We cover both the hardware and software highlights of both of these CCD controller systems as well as their respective performance.

Proceedings Article | 9 July 1998 Paper

Elastomeric lens mounts

Terry Mast, P. Choi, David Cowley, Sandra Faber, Eric James, A. Shambrook

Proc. SPIE. 3355, Optical Astronomical Instrumentation

KEYWORDS: Observatories, Spectrographs, Cameras, Metals, Glasses, Error analysis, Silicon, Aluminum, Keck Observatory, Temperature metrology

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Proceedings Article | 9 July 1998 Paper

Design update of DEIMOS: a wide-field faint-object spectrograph

Eric James, David Cowley, Sandra Faber, David Hilyard, Jack Osborne

Proc. SPIE. 3355, Optical Astronomical Instrumentation

KEYWORDS: Telescopes, Mirrors, Spectrographs, Cameras, Sensors, Lens design, Collimators, Aspheric lenses, Spherical lenses, Surface finishing

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Proceedings Article | 9 July 1998 Paper

DEIMOS dewar and CCD mosaic

David Cowley, Trent Freeman

Proc. SPIE. 3355, Optical Astronomical Instrumentation

KEYWORDS: Observatories, Spectrographs, Sensors, Copper, Control systems, Aluminum, Charge-coupled devices, Connectors, Optical instrument design, Prototyping

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Proceedings Article | 26 May 1998 Paper

Tests of a precision tiltmeter system for measuring telescope position

Robert Kibrick, Lloyd Robinson, Vernon Wallace, David Cowley

Proc. SPIE. 3351, Telescope Control Systems III

KEYWORDS: Telescopes, Mirrors, Sensors, Calibration, Electrodes, Computer programming, Servomechanisms, Analog electronics, Optical instrument design, Prototyping

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Proceedings Article | 18 September 1997 Paper

Tests of incremental rotary encoders

Lloyd Robinson, Robert Kibrick, David Cowley, Jack Osborne

Proc. SPIE. 3112, Telescope Control Systems II

KEYWORDS: Observatories, Telescopes, Electronics, Computer programming, Head, Solids, Aluminum, Signal generators, Analog electronics, Motion measurement

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Proceedings Article | 21 March 1997 Paper

DEIMOS: a wide-field faint-object spectrograph

David Cowley, Sandra Faber, David Hilyard, Eric James, Jack Osborne

Proc. SPIE. 2871, Optical Telescopes of Today and Tomorrow

KEYWORDS: Telescopes, Mirrors, Spectrographs, Cameras, Sensors, Collimators, Profilometers, Aspheric lenses, Spherical lenses, Surface finishing

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Proceedings Article | 8 June 1995 Paper

Evaluation of precision tilt sensors for measuring telescope position

Robert Kibrick, Lloyd Robinson, David Cowley

Proc. SPIE. 2479, Telescope Control Systems

KEYWORDS: Telescopes, Mirrors, Stars, Sensors, Electrodes, Computer programming, Servomechanisms, Analog electronics, Optical instrument design, Prototyping

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Proceedings Article | 8 June 1995 Paper

Image improvement of CFHT's primary mirror: primary mirror autocollimation

Edward Stokes, David Cowley, Charles Cavedoni, Tony Young

Proc. SPIE. 2479, Telescope Control Systems

KEYWORDS: Actuators, Monochromatic aberrations, Telescopes, Mirrors, Astronomy, Switches, Control systems, Autocollimation, Servomechanisms, Optical instrument design

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Proceedings Article | 1 July 1990 Paper

Seeing at Mauna Kea: a joint UH-UN-NOAO-CFHT study

Francois Roddier, Lennox Cowie, J. Elon Graves, A. Songaila, Daniel McKenna, Jean Vernin, Max Azouit, J. Caccia, Eric Limburg, Claude Roddier, Derrick Salmon, Stephane Beland, David Cowley, S. Hill

Proc. SPIE. 1236, Advanced Technology Optical Telescopes IV

KEYWORDS: Telescopes, Astronomy, Wavefronts, Domes, Turbulence, Meteorology, Optical telescopes, Lanthanum, Atmospheric optics, Shearing interferometers

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Showing 5 of 32 publications

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