28 results on '"Dan Kerley"'
Search Results
2. MORFEO@ELT: preliminary design of the real-time computer
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Andrea Baruffolo, Ivano Baronchelli, Salvatore Savarese, Salvatore Lampitelli, Italo Foppiani, Giulio Capasso, Pietro Schipani, Amedeo Petrella, Danilo Selvestrel, Lorenzo Busoni, Guido Agapito, Cédric Plantet, Marcos Suárez Valles, Sylvain Oberti, Lorenzo Pettazzi, Pierre Haguenauer, Roberto Biasi, Mauro Manetti, Damien Gratadour, François Rigaut, Jean-Pierre Véran, Dan Kerley, Malcom Smith, Jennifer S. Dunn, Andrea Balestra, Enrico Giro, Rosanna Sordo, Simonetta Chinellato, and Paolo Ciliegi
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- 2022
3. HEART: Gemini North Adaptive Optics (GNAO) real-time controller using the Herzberg Extensible Adaptive Real-time Toolkit (HEART)
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Jennifer S. Dunn, Dan Kerley, Malcolm Smith, Edward Chapin, Jonathan Stocks, Lianne Muller, Darryl Gamroth, Kate J. Jackson, and Jean-Pierre Véran
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- 2022
4. Gemini North Adaptive Optics (GNAO) facility overview and status updates
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Gaetano Sivo, Julia Scharwächter, Manuel Lazo, Célia Blain, Stephen Goodsell, Marcos A. van Dam, Martin Tschimmel, Henry Roe, Jennifer Lotz, Kim Tomasino-Reed, William N. Rambold, Courtney Raich, Ricardo Cardenes, Angelic Ebbers, Tim Gaggstatter, Pedro Gigoux, Thomas Schneider, Charles Cavedoni, Stacy Kang, Stanislas Karewicz, Heather Carr, Jesse Ball, Paul Hirst, Emmanuel Chirre, John White, Lindsay Magill, Molly Grogan, Anne Jordan, Suresh Sivanandam, Masen Lamb, Adam Muzzin, Eduardo Marin, Scott C. Chapman, Jennifer S. Dunn, Dan Kerley, Jean-Pierre Véran, Morten Andersen, Franck Marchis, Ruben Diaz, John P. Blakeslee, Michael J. Pierce, Rodrigo Carrasco, Hwihyun Kim, Anja Feldmeier-Krause, Alan McConnachie, James Jee, Wesley Fraser, S. Mark Ammons, Christopher Packham, John Bally, Trent J. Dupuy, Daniel Huber, Marie Lemoine-Busserolle, Thomas Puzia, Paolo Turri, Chadwick Trujillo, and Janice Lee
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FOS: Physical sciences ,Astrophysics - Instrumentation and Methods for Astrophysics ,Instrumentation and Methods for Astrophysics (astro-ph.IM) - Abstract
The Gemini North Adaptive Optics (GNAO) facility is the upcoming AO facility for Gemini North providing a state-of-the-art AO system for surveys and time domain science in the era of JWST and Rubin operations. GNAO will be optimized to feed the Gemini infrared Multi Object Spectrograph (GIRMOS). While GIRMOS is the primary science driver for defining the capabilities of GNAO, any instrument operating with an f/32 beam can be deployed using GNAO. The GNAO project includes the development of a new laser guide star facility which will consist of four side-launched laser beams supporting the two primary AO modes of GNAO: a wide-field mode providing an improved image quality over natural seeing for a 2-arcminute circular field-of-view and a narrow-field mode providing near diffraction-limited performance over a 20x20 arcsecond square field-of-view. The GNAO wide field mode will enable GIRMOS's multi-IFU configuration in which the science beam to each individual IFU will be additionally corrected using multi-object AO within GIRMOS. The GNAO narrow field mode will feed the GIRMOS tiled IFU configuration in which all IFUs are combined into a "super"-IFU in the center of the field. GNAO also includes the development of a new Real Time Controller, a new GNAO Facility System Controller and finally the development of a new AO Bench. We present in this paper an overview of the GNAO facility and provide a status update of each product., SPIE conference 2022 Montreal
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- 2022
5. GPI 2.0: pyramid wavefront sensor status
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Saavidra Perera, Jérôme Maire, Clarissa R. Do Ó, Jayke S. Nguyen, Daniel M. Levinstein, Quinn M. Konopacky, Jeffrey K. Chilcote, Joeleff Fitzsimmons, Randall Hamper, Dan Kerley, Bruce Macintosh, Christian Marois, Fredrik T. Rantakyrö, Dmitry Savransky, Jean-Pierre Véran, Guido Agapito, S. Mark Ammons, Marco Bonaglia, Marc-André Boucher, Jennifer S. Dunn, Simone Esposito, Guillaume Filion, Jean-Thomas . Landry, Olivier Lardière, Duan Li, Daren Dillon, Alex Madurowicz, Dillon H. Peng, Lisa Poyneer, and Eckhart Spalding
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- 2022
6. GPI 2.0: performance evaluation of the wavefront sensor’s EMCCD
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Clarissa R. Do Ó, Saavidra Perera, Jérôme Maire, Jayke S. Nguyen, Daniel M. Levinstein, Quinn M. Konopacky, Jeffrey K. Chilcote, Joeleff Fitzsimmons, Randall Hamper, Dan Kerley, Bruce Macintosh, Christian Marois, Fredrik T. Rantakyrö, Dmitry Savransky, Jean-Pierre Véran, Guido Agapito, S. Mark Ammons, Marco Bonaglia, Marc-André Boucher, Jennifer S. Dunn, Simone Esposito, Guillaume Filion, Jean-Thomas Landry, Olivier Lardière, Duan Li, Alex Madurowicz, Dillon H. Peng, Lisa Poyneer, and Eckhart Spalding
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- 2022
7. GPI 2.0: End-to-end simulations of the AO-coronagraph system
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Jayke S. Nguyen, Jérôme Maire, Saavidra Perera, Daniel M. Levinstein, Clarissa R. Do Ó, Quinn M. Konopacky, Jeffrey K. Chilcote, Joeleff Fitzsimmons, Randall Hamper, Dan Kerley, Bruce Macintosh, Christian Marois, Fredrik T. Rantakyrö, Dmitry Savransky, Jean-Pierre Véran, Guido Agapito, S. Mark Ammons, Marco Bonaglia, Marc-Andre Boucher, Jennifer S. Dunn, Simone Esposito, Guillaume Filion, Jean-Thomas Landry, Olivier Lardière, Duan Li, Alex Madurowicz, Meiji M. Nguyen, Bryony Nickson, Dillon H. Peng, Emiel Por, Lisa Poyneer, and Rémi Soummer
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- 2022
8. GPI 2.0: upgrading the Gemini Planet Imager
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Jérôme Maire, Dan Kerley, Lisa Poyneer, Jennifer Dunn, Coleman Thomas, Marshall D. Perrin, Mamadou N'Diaye, Robert J. De Rosa, Mark Ammons, Olivier Lardière, Marco Bonaglia, Simone Esposito, Joeleff Fitzsimmons, Kaitlyn Summey, Jean-Thomas Landry, Maeve Curliss, Jean-Pierre Veran, Bruce Macintosh, Guillaume Filion, Christian Marois, Isabel Kain, Eric L. Nielsen, Marc-André Boucher, Quinn Konopacky, Randall Hamper, Guido Agapito, Laurent Pueyo, Rémi Soummer, Alex Madurowicz, Mary Anne Limbach, Arlene Aleman, M. Lemoine-Busserolle, Dmitry Savransky, Jeffrey Chilcote, Duan Li, Evans, Christopher J., Bryant, Julia J., Motohara, Kentaro, Joseph Louis LAGRANGE (LAGRANGE), Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS), Observatoire de la Côte d'Azur (OCA), and Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
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[PHYS]Physics [physics] ,Computer science ,Astronomy ,Context (language use) ,01 natural sciences ,Exoplanet ,adaptive optics ,law.invention ,010309 optics ,Upgrade ,Integral field spectrograph ,[SDU]Sciences of the Universe [physics] ,extrasolar planets ,coronagraphy ,law ,0103 physical sciences ,integral field spectrograph ,Gemini Planet Imager ,Adaptive optics ,010303 astronomy & astrophysics ,Coronagraph ,ComputingMilieux_MISCELLANEOUS ,Jupiter mass - Abstract
The Gemini Planet Imager (GPI) is a dedicated high-contrast imaging facility designed for the direct detection and characterization of young Jupiter mass exoplanets. After six yrs of operation at Gemini South, GPI has helped establish that Jovian planets are rare at wide separations, but have higher occurrence rates at small separations. This motivates an upgrade of GPI to achieve deeper contrasts, especially at small inner working angles, while leveraging its current capabilities. GPI has been funded to undergo a major science-driven upgrade as part of a relocation to Gemini North (GN). Gemini plans to remove GPI at the end of 2020A. We present the status of the proposed upgrades to GPI including a EMCCD-based pyramid wavefront sensor, broadband low spectral resolution prisms and new apodized-pupil Lyot coronagraph designs. We discuss the expected performance improvements in the context of GPI 2.0's enhanced science capabilities which are scheduled to be made available at GN in 2022., SPIE Astronomical Telescopes + Instrumentation, December 14-18, 2020, Online Only, United States, Series: Proceedings of SPIE
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- 2020
9. The Infrared Imaging Spectrograph (IRIS) for TMT: final software design update
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Eric Chisholm, Glen Herriot, Ryuji Suzuki, Jennifer Dunn, Ji Man Sohn, Takashi Nakamoto, James E. Larkin, Andrea Zonca, David Andersen, Kim Gillies, Yutaka Hayano, Dan Kerley, Edward L. Chapin, Arun Surya, Chris Johnson, and Shelley A. Wright
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Java ,Computer science ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,FOS: Physical sciences ,02 engineering and technology ,01 natural sciences ,law.invention ,010309 optics ,Telescope ,Software ,law ,0103 physical sciences ,Instrumentation and Methods for Astrophysics (astro-ph.IM) ,Spectrograph ,computer.programming_language ,Instrument control ,business.industry ,021001 nanoscience & nanotechnology ,Component-based software engineering ,Software design ,Astrophysics - Instrumentation and Methods for Astrophysics ,0210 nano-technology ,business ,computer ,Thirty Meter Telescope ,Computer hardware - Abstract
The InfraRed Imaging Spectrograph (IRIS) is the first-light client instrument for the Narrow Field Infrared Adaptive Optics System (NFIRAOS) on the Thirty Meter Telescope (TMT). Now approaching the end of its final design phase, we provide an overview of the instrument control software. The design is challenging since IRIS has interfaces with many systems at different stages of development (e.g., NFIRAOS, telescope control system, observatory sequencers), and will be built using the newly-developed TMT Common Software (CSW), which provides framework code (Java/Scala), and services (e.g., commands, telemetry). Lower-level software will be written in a combination of Java and C/C++ to communicate with hardware, such as motion controllers and infrared detectors. The overall architecture and philosophy of the IRIS software is presented, as well as a summary of the individual software components and their interactions with other systems., Comment: 20 pages, 9 figures, SPIE (2020) 11452-28
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- 2020
10. NFIRAOS adaptive optics for the Thirty Meter Telescope
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Jeffrey D. Crane, Dan Kerley, Glen Herriot, Brian Hoff, Gelys Trancho, Corinne Boyer, Kate Jackson, Tim Hardy, Adam Densmore, Lianqi Wang, Malcolm G. Smith, Jonathan Stocks, Joeleff Fitzsimmons, Jennifer Dunn, Jean-Pierre Veran, David R. Andersen, Peter Byrnes, Olivier Lardière, Melissa Trubey, Jenny Atwood, Close, Laird M., Schreiber, Laura, and Schmidt, Dirk
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Wavefront ,business.industry ,Computer science ,Distortion (optics) ,01 natural sciences ,010309 optics ,Optics ,Laser guide star ,0103 physical sciences ,Extremely Large Telescope ,Guide star ,business ,Adaptive optics ,010303 astronomy & astrophysics ,Spectrograph ,Thirty Meter Telescope - Abstract
NFIRAOS (Narrow-Field InfraRed Adaptive Optics System) will be the first-light multi-conjugate adaptive optics system for the Thirty Meter Telescope (TMT). NFIRAOS houses all of its opto-mechanical sub-systems within an optics enclosure cooled to precisely -30°C in order to improve sensitivity in the near-infrared. It supports up to three client science instruments, including the first-light InfraRed Imaging Spectrograph (IRIS). Powering NFIRAOS is a Real Time Controller that will process the signals from six laser wavefront sensors, one natural guide star pyramid WFS, up to three low-order on-instrument WFS and up to four guide windows on the client instrument’s science detector in order to correct for atmospheric turbulence, windshake, optical errors and plate-scale distortion. NFIRAOS is currently preparing for its final design review in late June 2018 at NRC Herzberg in Victoria, British Columbia in partnership with Canadian industry and TMT., Adaptive Optics Systems VI, June 10-15, 2018, Austin, United States, Series: Proceedings of SPIE; no. 10703
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- 2018
11. The Real-Time controller (RTC) for the Narrow Field Infrared Adaptive Optics System (NFIRAOS) for TMT final design
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Gelys Trancho, Glen Herriot, Corinne Boyer, Malcolm Smith, Luc Gilles, Jean-Pierre Véran, Lianqi Wang, Dan Kerley, Ed Chapin, Jennifer Dunn, Close, Laird M., Schreiber, Laura, and Schmidt, Dirk
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Wavefront ,Laser guide star ,Tilt (optics) ,business.industry ,Computer science ,Wavefront sensor ,Guide star ,business ,Adaptive optics ,Computer hardware ,Deformable mirror ,Thirty Meter Telescope - Abstract
The Real-Time Controller (RTC) for the Thirty Meter Telescope (TMT) Narrow Field Infrared Adaptive Optics System (NFIRAOS) is the software and server hardware that converts wavefront error measurements into wavefront corrector demands, at the heart of the laser guide star multi-conjugate adaptive optics (MCAO) or natural guide star adaptive optics (NGS AO). The RTC takes input from up to six Shack-Hartmann Laser Guide Star wavefront sensors (LGS WFS), one high-order Natural Guide Star Pyramid Wavefront Sensor (PWFS), up to three Shack-Hartmann On-Instrument wavefront sensors (OIWFS) that are located in the client science instruments, and up to 4 on-detector guide windows (ODGW) also in the client instruments. The RTC controls two deformable mirrors conjugated to 0km (DM0) and 11.8km (DM11). DM0 is mounted on a tip/tilt stage (TTS). During the final design phase we performed prototyping to verify that off-the-shelf servers using general purpose CPUs are able to support the maximum 800 Hz frequency at which the RTC is required to operate. We also considered methods to provide live data streams to a graphical user interface without impacting the AO system performance. This paper will discusses the outcome of the impact of jitter and latency on loop speed in our prototype and an overview of the RTC pipeline, including the many “knobs” that can be turned to fine-tune the behavior of NFIRAOS in different observing modes, and under different observing conditions.
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- 2018
12. The Infrared Imaging Spectrograph (IRIS) for TMT: closed-loop adaptive optics while dithering
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Kai Zhang, Eric Chisholm, Shelley A. Wright, Mark Sirota, Lianqi Wang, Ryuji Suzuki, Yutaka Hayano, James E. Larkin, Jennifer Dunn, Bob Weber, David Andersen, Kim Gillies, Dan Kerley, Glen Herriot, Edward L. Chapin, Jimmy Johnson, Luc Simard, Gelys Trancho, Takashi Nakamoto, Brent Ellerbroek, Guzman, Juan C., and Ibsen, Jorge
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Wavefront ,business.industry ,Computer science ,Astrophysics::Instrumentation and Methods for Astrophysics ,FOS: Physical sciences ,Wavefront sensor ,Astrophysics::Cosmology and Extragalactic Astrophysics ,01 natural sciences ,law.invention ,010309 optics ,Telescope ,Optics ,Tilt (optics) ,law ,0103 physical sciences ,Guide star ,Astrophysics::Earth and Planetary Astrophysics ,business ,Adaptive optics ,Astrophysics - Instrumentation and Methods for Astrophysics ,010303 astronomy & astrophysics ,Spectrograph ,Instrumentation and Methods for Astrophysics (astro-ph.IM) ,Thirty Meter Telescope ,Astrophysics::Galaxy Astrophysics - Abstract
The InfraRed Imaging Spectrograph (IRIS) is the first-light client instrument for the Narrow Field Infrared Adaptive Optics System (NFIRAOS) on the Thirty Meter Telescope (TMT). IRIS includes three natural guide star (NGS) On-Instrument Wavefront Sensors (OIWFS) to measure tip/tilt and focus errors in the instrument focal plane. NFIRAOS also has an internal natural guide star wavefront sensor, and IRIS and NFIRAOS must precisely coordinate the motions of their wavefront sensor positioners to track the locations of NGSs while the telescope is dithering (offsetting the telescope to cover more area), to avoid a costly re-acquisition time penalty. First, we present an overview of the sequencing strategy for all of the involved subsystems. We then predict the motion of the telescope during dithers based on finite-element models provided by TMT, and finally analyze latency and jitter issues affecting the propagation of position demands from the telescope control system to individual motor controllers., 21 pages, 19 figures, SPIE (2018) 10707-49
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- 2018
13. Thirty Meter Telescope (TMT) Narrow Field Infrared Adaptive Optics System (NFIRAOS) real-time controller preliminary architecture
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Jennifer Dunn, Lianqi Wang, Jean-Pierre Véran, Glen Herriot, Malcolm G. Smith, Corinne Boyer, Brent Ellerbroek, Luc Gilles, Dan Kerley, Chiozzi, Gianluca, and Guzman, Juan C.
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Wavefront ,Pixel ,Infrared ,Computer science ,business.industry ,Real-time computing ,02 engineering and technology ,First light ,021001 nanoscience & nanotechnology ,01 natural sciences ,Deformable mirror ,010309 optics ,Server ,Telemetry ,0103 physical sciences ,Computer data storage ,ComputerSystemsOrganization_SPECIAL-PURPOSEANDAPPLICATION-BASEDSYSTEMS ,0210 nano-technology ,business ,Adaptive optics ,Thirty Meter Telescope - Abstract
The Narrow Field Infrared Adaptive Optics System (NFIRAOS) is the first light Adaptive Optics (AO) system for the Thirty Meter Telescope (TMT). A critical component of NFIRAOS is the Real-Time Controller (RTC) subsystem which provides real-time wavefront correction by processing wavefront information to compute Deformable Mirror (DM) and Tip/Tilt Stage (TTS) commands. The National Research Council of Canada - Herzberg (NRC-H), in conjunction with TMT, has developed a preliminary design for the NFIRAOS RTC. The preliminary architecture for the RTC is comprised of several Linux-based servers. These servers are assigned various roles including: the High-Order Processing (HOP) servers, the Wavefront Corrector Controller (WCC) server, the Telemetry Engineering Display (TED) server, the Persistent Telemetry Storage (PTS) server, and additional testing and spare servers. There are up to six HOP servers that accept high-order wavefront pixels, and perform parallelized pixel processing and wavefront reconstruction to produce wavefront corrector error vectors. The WCC server performs low-order mode processing, and synchronizes and aggregates the high-order wavefront corrector error vectors from the HOP servers to generate wavefront corrector commands. The Telemetry Engineering Display (TED) server is the RTC interface to TMT and other subsystems. The TED server receives all external commands and dispatches them to the rest of the RTC servers and is responsible for aggregating several offloading and telemetry values that are reported to other subsystems within NFIRAOS and TMT. The TED server also provides the engineering GUIs and real-time displays. The Persistent Telemetry Storage (PTS) server contains fault tolerant data storage that receives and stores telemetry data, including data for Point-Spread Function Reconstruction (PSFR).
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- 2016
14. Thirty Meter Telescope narrow-field infrared adaptive optics system real-time controller prototyping results
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Luc Gilles, Edward L. Chapin, Dan Kerley, Jean-Pierre Véran, Jennifer Dunn, Brent Ellerbroek, Glen Herriot, Malcolm Smith, Corinne Boyer, Lianqi Wang, Marchetti, Enrico, Close, Laird M., and Véran, Jean-Pierre
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Wavefront ,Infrared ,Computer science ,business.industry ,02 engineering and technology ,Wavefront sensor ,First light ,021001 nanoscience & nanotechnology ,01 natural sciences ,Deformable mirror ,010309 optics ,Laser guide star ,0103 physical sciences ,Guide star ,0210 nano-technology ,business ,Adaptive optics ,Simulation ,Computer hardware ,Thirty Meter Telescope - Abstract
Prototyping and benchmarking was performed for the Real-Time Controller (RTC) of the Narrow Field InfraRed Adaptive Optics System (NFIRAOS). To perform wavefront correction, NFIRAOS utilizes two deformable mirrors (DM) and one tip/tilt stage (TTS). The RTC receives wavefront information from six Laser Guide Star (LGS) Shack- Hartmann WaveFront Sensors (WFS), one high-order Natural Guide Star Pyramid WaveFront Sensor (PWFS) and multiple low-order instrument detectors. The RTC uses this information to determine the commands to send to the wavefront correctors. NFIRAOS is the first light AO system for the Thirty Meter Telescope (TMT). The prototyping was performed using dual-socket high performance Linux servers with the real-time (PREEMPT_RT) patch and demonstrated the viability of a commercial off-the-shelf (COTS) hardware approach to large scale AO reconstruction. In particular, a large custom matrix vector multiplication (MVM) was benchmarked which met the required latency requirements. In addition all major inter-machine communication was verified to be adequate using 10Gb and 40Gb Ethernet. The results of this prototyping has enabled a CPU-based NFIRAOS RTC design to proceed with confidence and that COTS hardware can be used to meet the demanding performance requirements.
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- 2016
15. Comparing the performance of open loop centroiding techniques in the Raven MOAO system
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Jean-Pierre Véran, Darryl Gamroth, Dan Kerley, David R. Andersen, Colin Bradley, and Olivier Lardière
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Pixel ,Computer science ,media_common.quotation_subject ,Detector ,Deformable mirror ,Sampling (signal processing) ,Sky ,Limiting magnitude ,Computer graphics (images) ,Calibration ,Subaru Telescope ,Adaptive optics ,Algorithm ,media_common - Abstract
Raven is a multi-object adaptive optics (MOAO) demonstrator that will be mounted on the NIR Nasmyth platform of the Subaru telescope in May, 2014. Raven can use three open-loop NGS WFSs and an on-axis LGS WFS to control DMs in two separate science pick-off arms. Centroiding in open loop AO systems like Raven is more difficult than in closed loop AO systems because the Shack-Hartmann spots will not be driven to the same spot on a detector. Rather the spots can fall on any combination of pixels because the WFSs need to have sufficient dynamic range to measure the full turbulence. In this paper, we compare correlation and thresholded center of gravity (tCOG) centroiding methods in simulation, with Raven using its calibration unit, and on-sky. Each method has its own advantages. Correlation centroiding is superior to tCOG centroiding for faint NGSs and for extended sources (Raven open loop WFSs do not contain ADCs so spots will become elongated). We expect that correlation centroiding will push the limiting magnitude of Raven NGSs fainter by roughly one magnitude. Correlation centroiding is computationally more intensive, however, and actually will limit Raven’s sampling rate for shorter integrations. Therefore, for bright stars with sufficiently high signal-to-noise, Raven can be run significantly faster and with superior performance using the tCOG method. Here we quantify both the performance and timing differences of these two centroiding methods in simulation, in the lab and on sky using Raven.
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- 2014
16. The Gemini planet imager: first light and commissioning
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Lisa Poyneer, Vlad Reshetov, Laurent Pueyo, Michael P. Fitzgerald, Jérôme Maire, Brian J. Bauman, Kathleen Labrie, John Pazder, Markus Hartung, Rebecca Oppenheimer, Jason J. Wang, Franck Marchis, Jeffery Chilcote, Donald T. Gavel, Andrew Cardwell, Robert J. De Rosa, Carlos Quiroz, Patrick Ingraham, Sandrine Thomas, Naru Sadakuni, James E. Larkin, Kris Caputa, Ramon Galvez, David Palmer, Malcolm Smith, Bruce Macintosh, Dmitry Savransky, Sloane Wiktorowicz, Alexandra Z. Greenbaum, Marshall D. Perrin, René Doyon, Darren Erickson, Andre Anthony, Daren Dillon, Quinn Konopacky, Les Saddlemyer, Rémi Soummer, James R. Graham, Max Millar-Blanchaer, Andrew Serio, Christian Marois, James K. Wallace, Jenny Atwood, Arturo Nunez, Anand Sivaramakrishnan, Stephen J. Goodsell, Schuyler Wolff, Jason Weiss, Dan Kerley, Fredrik T. Rantakyrö, Katie M. Morzinski, Pascale Hibon, and Jennifer Dunn
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Physics ,business.industry ,Astronomy ,Wavefront sensor ,First light ,Exoplanet ,law.invention ,Telescope ,Optics ,Integral field spectrograph ,law ,Gemini Planet Imager ,business ,Adaptive optics ,Coronagraph - Abstract
The Gemini Planet Imager (GPI) is a facility extreme-AO high-contrast instrument – optimized solely for study of faint companions – on the Gemini telescope. It combines a high-order MEMS AO system (1493 active actuators), an apodized pupil Lyot coronagraph, a high-accuracy IR post-coronagraph wavefront sensor, and a near-infrared integral field spectrograph. GPI incorporates several other novel features such as ultra-high quality optics, a spatially-filtered wavefront sensor, and new calibration techniques. GPI had first light in November 2013. This paper presnets results of first-light and performance verification and optimization and shows early science results including extrasolar planet spectra and polarimetric detection of the HR4696A disk. GPI is now achieving contrasts approaching 10-6 at 0.5” in 30 minute exposures.
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- 2014
17. Benchmarking hardware architecture candidates for the NFIRAOS real-time controller
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Glen Herriot, Jean-Pierre Veran, Malcolm Smith, and Dan Kerley
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Hardware architecture ,Optical telescopes ,Xeon ,Controllers ,Computer science ,Hyper-threading ,ComputerSystemsOrganization_PROCESSORARCHITECTURES ,Computer operating systems ,Real time control ,computer.software_genre ,Adaptive control systems ,Program processors ,Phi ,NFIRAOS ,Benchmarking ,Real time controllers ,Control theory ,Operating system ,Benchmark (computing) ,Central processing unit ,RTC ,computer ,Adaptive optics ,Xeon Phi - Abstract
As a part of the trade study for the Narrow Field Infrared Adaptive Optics System, the adaptive optics system for the Thirty Meter Telescope, we investigated the feasibility of performing real-time control computation using a Linux operating system and Intel Xeon E5 CPUs. We also investigated a Xeon Phi based architecture which allows higher levels of parallelism. This paper summarizes both the CPU based real-time controller architecture and the Xeon Phi based RTC. The Intel Xeon E5 CPU solution meets the requirements and performs the computation for one AO cycle in an average of 767 microseconds. The Xeon Phi solution did not meet the 1200 microsecond time requirement and also suffered from unpredictable execution times. More detailed benchmark results are reported for both architectures., Adaptive Optics Systems IV, June 22-27, 2014, Series: Proceedings of SPIE; no. 9148
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- 2014
18. Characterization of the Atmospheric Dispersion Corrector of the Gemini Planet Imager
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Ramon Galvez, Vincent Fesquet, Markus Hartung, Andrew Cardwell, Jennifer Atwood, Les Saddlemyer, Bruce Macintosh, Sandrine Thomas, Dan Kerley, Marshall D. Perrin, Jennifer Dunn, Kayla Hardie, Pascale Hibon, Stephen J. Goodsell, Fredrik T. Rantakyrö, Andrew Serio, James R. Graham, Carlos Quiroz, Dmitry Savransky, Gaston Gausachs, and Naru Sadakuni
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Earth and Planetary Astrophysics (astro-ph.EP) ,media_common.quotation_subject ,Instrumentation ,FOS: Physical sciences ,First light ,Atmospheric dispersion modeling ,law.invention ,Telescope ,Sky ,law ,Dispersion (optics) ,Environmental science ,Gemini Planet Imager ,Astrophysics - Instrumentation and Methods for Astrophysics ,Instrumentation and Methods for Astrophysics (astro-ph.IM) ,Zenith ,Astrophysics - Earth and Planetary Astrophysics ,Remote sensing ,media_common - Abstract
An Atmospheric Dispersion Corrector (ADC) uses a double-prism arrangement to nullify the vertical chromatic dispersion introduced by the atmosphere at non-zero zenith distances. The ADC installed in the Gemini Planet Imager (GPI) was first tested in August 2012 while the instrument was in the laboratory. GPI was installed at the Gemini South telescope in August 2013 and first light occurred later that year on November 11th. In this paper, we give an overview of the characterizations and performance of this ADC unit obtained in the laboratory and on sky, as well as the structure of its control software., Comment: 16 pages, 12 figures. Proceedings of the SPIE, 9147-183
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- 2014
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19. Gemini Planet Imager One Button Approach
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Bruce Macintosh, David Palmer, Dan Kerley, Robert Wooff, Fredrik T. Rantakyrö, Stephen J. Goodsell, Jason Weiss, Leslie Saddlemyer, Malcolm G. Smith, Jennifer Dunn, Carlos Quiroz, and Dmitry Savransky
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Earth and Planetary Astrophysics (astro-ph.EP) ,Computer science ,business.industry ,FOS: Physical sciences ,Wavefront sensor ,Deformable mirror ,law.invention ,Telescope ,Integral field spectrograph ,law ,Observatory ,Gemini Planet Imager ,Aerospace engineering ,Adaptive optics ,business ,Astrophysics - Instrumentation and Methods for Astrophysics ,Coronagraph ,Instrumentation and Methods for Astrophysics (astro-ph.IM) ,Astrophysics - Earth and Planetary Astrophysics - Abstract
The Gemini Planet Imager (GPI) is an "extreme" adaptive optics coronagraph system that is now on the Gemini South telescope in Chile. This instrument is composed of three different systems that historically have been separate instruments. These systems are the extreme Adaptive Optics system, with deformable mirrors, including a high-order 64x64 element MEMS system; the Science Instrument, which is a near-infrared integral field spectrograph; and the Calibration system, a precision IR wavefront sensor that also holds key coronagraph components. Each system coordinates actions that require precise timing. The observatory is responsible for starting these actions and has typically done this asynchronously across independent systems. Despite this complexity we strived to provide an interface that is as close to a one-button approach as possible. This paper will describe the sequencing of these systems both internally and externally through the observatory., Comment: 9 pages, 2 figures. Proceedings of the SPIE, 9147-190
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- 2014
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20. The Gemini Planet Imager: integration and status
- Author
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F. Rantakyrö, Dan Kerley, Ramon Galvez, Lisa Poyneer, Stephen J. Goodsell, René Doyon, David Palmer, James R. Graham, Jeffery Chilcote, Sandrine Thomas, Jason Weiss, Brian J. Bauman, Andre Anthony, Marshall D. Perrin, Kris Caputa, James E. Larkin, Carlos Quirez, Markus Hartung, J. Kent Wallace, Donald T. Gavel, Leslie Saddlemyer, Kathleen Labrie, Arturo Nunez, Nicolas A. Barriga, Jérôme Maire, John Pazder, Sloane J. Wiktorowicz, Vlad Reshtov, Bruce Macintosh, Jennifer Atwood, Malcolm Smith, J. A. Isaacs, Daren Dillon, Anand Sivaramakrishnan, Quinn Konopacky, Rémi Soummer, Ben R. Oppenheimer, Christian Marois, Max Millar-Blanchaer, Dmitry Savransky, Jennifer Dunn, and Naru Sadakuni
- Subjects
Physics ,business.industry ,Wavefront sensor ,Exoplanet ,law.invention ,Interferometry ,Speckle pattern ,Optics ,Integral field spectrograph ,law ,Gemini Planet Imager ,business ,Adaptive optics ,Coronagraph - Abstract
The Gemini Planet Imager is a next-generation instrument for the direct detection and characterization of young warm exoplanets, designed to be an order of magnitude more sensitive than existing facilities. It combines a 1700-actuator adaptive optics system, an apodized-pupil Lyot coronagraph, a precision interferometric infrared wavefront sensor, and a integral field spectrograph. All hardware and software subsystems are now complete and undergoing integration and test at UC Santa Cruz. We will present test results on each subsystem and the results of end-to-end testing. In laboratory testing, GPI has achieved a raw contrast (without post-processing) of 10-6 5σ at 0.4”, and with multiwavelength speckle suppression, 2x10-7 at the same separation.
- Published
- 2012
21. TMT NFIRAOS: adaptive optics system for the Thirty Meter Telescope
- Author
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Peter Byrnes, Jenny Atwood, Marc-André Boucher, Vlad Reshetov, Luc Gilles, Jennifer Dunn, Malcolm Smith, Scott Roberts, Ivan Wevers, Dan Kerley, Joeleff Fitzsimmons, Lianqi Wang, David R. Andersen, Alexis Hill, Jean-Pierre Véran, Glen Herriot, Carlos Correia, Paul Hickson, John Pazder, Brent Ellerbroek, Corinne Boyer, Kris Caputa, Ellerbroek, Brent L., Marchetti, Enrico, and Véran, Jean-Pierre
- Subjects
Physics ,business.industry ,media_common.quotation_subject ,Field of view ,Astrometry ,Photometry (optics) ,Optics ,Laser guide star ,Research council ,Sky ,business ,Adaptive optics ,Thirty Meter Telescope ,Remote sensing ,media_common - Abstract
NFIRAOS is the first-light adaptive optics system planned for the Thirty Meter Telescope, and is being designed at the National Research Council of Canada's Herzberg Institute of Astrophysics. NFIRAOS is a laser guide star multiconjugate adaptive optics system - a practical approach to providing diffraction limited image quality in the NIR over a 30" field of view, with high sky coverage. This will enable a wide range of TMT science that depends upon the large corrected field of view and high precision astrometry and photometry. We review recent progress developing the design and conducting performance estimates for NFIRAOS.
- Published
- 2012
22. Gemini multi-object spectrograph focal plane CCD upgrade
- Author
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J. Murray Fletcher, Tim Hardy, Dan Kerley, Kei Szeto, Andre Anthony, Darren Erickson, Ivan Wevers, Richard Murowinski, and Jennifer Dunn
- Subjects
Physics ,Gemini Observatory ,Upgrade ,Optics ,Cardinal point ,business.industry ,System of measurement ,business ,Spectrograph - Abstract
The instrument group of the Herzberg Institute of Astrophysics has been commissioned by the Gemini Observatory to develop and implement a new focal plane assembly with an array of three Hamamatsu CCDs for the Gemini Multi- Object Spectrographs[1,2]. This paper describes the overall design of the new focal plane system with respect to the existing interface and requirements and outlines the test methodology to validate the new system against its performance requirements. The characterization and performance optimization processes of the Hamamatus CCDs are also described.
- Published
- 2010
23. Distributed modeling and control of a segmented mirror surface
- Author
-
Jennifer Dunn, Edward J. Park, and Dan Kerley
- Subjects
Image quality ,Segmented mirror ,Computer science ,business.industry ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,Shake ,Optical telescope ,law.invention ,Telescope ,Optics ,law ,Control system ,business ,Actuator ,Computer hardware - Abstract
The next generation of ground-based optical telescopes will employ increasingly large primary mirrors to achieve superior resolution and light collecting abilities. Many of these large mirror surfaces will be segmented into an array of hundreds of smaller mirror segments. The corresponding number of required sensors and actuators will be in the order of thousands, which creates a challenging control problem to stabilize and align each segment from external disturbances - wind shake, gravity forces, thermal effects, seismic effects and induced vibrations from surrounding equipment and telescope motion - so that the telescope's image quality requirements can be met. The use of a centralized control scheme may be infeasible due to the large number of inputs and outputs of the resulting control system, while a decentralize control scheme would lack global performance. An attractive alternative approach is an interconnected network of distributed controllers that provide global control with a highly scalable design and implementation. A segmented mirror can be considered as an interconnected system comprised of many similar discrete subsystems, where each subsystem represents an individual mirror segments and its dynamics are coupled directly to its neighboring segments. The resulting distributed controller network of controller subsystems are similarly coupled and working cooperatively to achieve the desired global performance.
- Published
- 2008
24. Gemini Planet Imager autonomous software
- Author
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James R. Graham, Jason Weiss, Dan Kerley, Dave Palmer, John Angione, Jennifer Dunn, Robert Wooff, Steve Jones, and Malcolm Smith
- Subjects
Computer science ,business.industry ,Principal (computer security) ,Software development ,Exoplanet ,law.invention ,Software ,Documentation ,law ,Observatory ,System integration ,Gemini Planet Imager ,Software system ,business ,Software engineering ,Coronagraph ,Simulation - Abstract
The Gemini Planet Imager (GPI) is an "extreme" adaptive optics coronagraph system that will have the ability to directly detect and characterize young Jovian-mass exoplanets. The design of this instrument involves eight principal institutions geographically spread across North America, with four of those sites writing software that must run seamlessly together while maintaining autonomous behaviour. The objective of the software teams is to provide Gemini with a unified software system that not only performs well but also is easy to maintain. Issues such as autonomous behaviour in a unified environment, common memory to share status and information, examples of how this is being implemented, plans for early software integration and testing, command hierarchy, plans for common documentation and updates are explored in this paper. The project completed its preliminary design phase in 2007, and has just recently completed its critical design phase.
- Published
- 2008
25. Optical performance analysis and optimization of large telescope structural designs
- Author
-
Dan Kerley, Scott Roberts, and Simon Sun
- Subjects
Wavefront ,genetic structures ,Computer science ,Astrophysics::Instrumentation and Methods for Astrophysics ,Mechanical engineering ,Encircled energy ,eye diseases ,Pupil ,Deformable mirror ,law.invention ,Telescope ,Primary mirror ,Linear optics ,law ,sense organs ,Secondary mirror ,Zemax ,Thirty Meter Telescope ,Simulation - Abstract
Optical Modeling and Performance Predictions II, San Diego, California, United States, Series: Proceedings of SPIE; no. 5867
- Published
- 2005
26. Validation and verification of integrated model simulations of a thirty meter telescope
- Author
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Jennifer Dunn, Joeleff Fitzsimmons, Scott Roberts, Nathan Stretch, Simon Sun, John Pazder, Malcolm Smith, and Dan Kerley
- Subjects
Physics ,business.industry ,Astrophysics::Instrumentation and Methods for Astrophysics ,computer.software_genre ,law.invention ,Simulation software ,Telescope ,Primary mirror ,Software ,law ,Secondary mirror ,business ,MATLAB ,Zemax ,computer ,Thirty Meter Telescope ,Simulation ,computer.programming_language - Abstract
The Herzberg Institute of Astrophysics has developed Integrated Modeling tools for the Thirty Meter Telescope (TMT) project. This simulation software, implemented in MATLAB, models the telescope optical system, structural dynamics, and the segmented primary mirror and secondary mirror active optical control systems. For the TMT project, the integrated model was used to assess the effect of wind loading on the telescope in terms of delivered image quality. The simulation includes a state-space model of the telescope structural dynamics derived from an ANSYS finite element model, a linear optics model derived from a ZEMAX prescription, and wind loading forces derived from PowerFLOW computational dynamics software. The overall complexity of the model necessitates rigorous validation and verification procedures to ensure that the simulation data structures properly represent the original design, and that the calculations performed by the system are reliable. In this paper we discuss the validation and verification of the model data structures, structural configuration, optical configuration, coordinate system transforms, linear optics model, Zernike calculations, and wind loading model. As a case study, we present the verification, validation, and simulation results of the Thirty Meter Telescope Reference Design.
- Published
- 2005
27. TMT/VLOT integrated modeling
- Author
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Glen Herriot, Dan Kerley, Jennifer Dunn, John Pazder, Joeleff Fitzsimmons, Scott Roberts, and Malcolm Smith
- Subjects
Primary mirror ,Telescope ,law ,Computer science ,Systems engineering ,Adaptive optics ,Secondary mirror ,Simulation ,Thirty Meter Telescope ,Optical telescope ,law.invention - Abstract
Photonics North, September 26-29, 2004, Ottawa, Ontario, Canada, Series: Proceedings of SPIE; no. 5579
- Published
- 2004
28. A Golgi-Cox morphological analysis of neuronal changes induced by environmental enrichment
- Author
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Richard J. Smeyne, Dan Kerley, and Ciaran J. Faherty
- Subjects
Male ,Telencephalon ,Cellular differentiation ,Hippocampus ,Dendrite ,Striatum ,Biology ,Mice ,Developmental Neuroscience ,Physical Conditioning, Animal ,medicine ,Animals ,Social Behavior ,Cell Size ,Cerebral Cortex ,Environmental enrichment ,Cerebrum ,Dentate gyrus ,Cell Differentiation ,Dendrites ,Environment, Controlled ,Mice, Inbred C57BL ,Neostriatum ,medicine.anatomical_structure ,nervous system ,Animals, Newborn ,Cerebral cortex ,Dentate Gyrus ,Mercuric Chloride ,Exploratory Behavior ,Potassium Dichromate ,sense organs ,Sensory Deprivation ,Neuroscience ,Developmental Biology - Abstract
Exposure to an enriched environment (EE), consisting of a combination of increased exercise, social interactions and learning, has been shown to produce many positive effects in the CNS. In this study, we use a Golgi-Cox analysis to examine and dissect the role of various components of the enriched environment on two measures of neuronal growth: total cell volume and total dendritic length in four regions of the brain. In the hippocampus, CA1 and dentate gyrus cells, animals raised in an enriched environment demonstrate significant morphological change. These changes were not observed in layer V pyramidal neurons of the cerebral cortex or spiny neurons located in the striatum. To determine if one or more of the individual components of the EE were responsible for the changes in neuronal morphology, we examined mice raised with free access to exercise wheels. In these mice, no morphological changes were observed. These results suggest that changes in the CA1 and dentate gyrus morphology were a result of alterations in the animal's environment and not an increase in motor activity.
- Published
- 2003
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