Lee Feinberg - Academia.edu (original) (raw)

Papers by Lee Feinberg

Research paper thumbnail of Path to a UV/optical/IR flagship: review of ATLAST and its predecessors

Journal of Astronomical Telescopes, Instruments, and Systems, 2016

Our recently completed study for the Advanced Technology Large-Aperture Space Telescope (ATLAST) ... more Our recently completed study for the Advanced Technology Large-Aperture Space Telescope (ATLAST) was the culmination of three years of initially internally funded work that built upon earlier engineering designs, science objectives, and technology priorities. Beginning in the mid-1980s, multiple teams of astronomers, technologists, and engineers developed concepts for a large-aperture UV/optical/IR space observatory intended to follow the Hubble Space Telescope (HST). Here, we summarize since the first significant conferences on major post-HST ultraviolet, optical, and infrared (UVOIR) observatories the history of designs, scientific goals, key technology recommendations, and community workshops. Although the sophistication of science goals and the engineering designs both advanced over the past three decades, we note the remarkable constancy of major characteristics of large post-HST UVOIR concepts. As it has been a priority goal for NASA and science communities for a half-century, and has driven much of the technology priorities for major space observatories, we include the long history of concepts for searching for Earth-like worlds. We conclude with a capsule summary of our ATLAST reference designs developed by four partnering institutions over the past three years, which was initiated in 2013 to prepare for the 2020 National Academies' Decadal Survey.

Research paper thumbnail of Spherical Primary Optical Telescope (SPOT): An Architecture Demonstration for Cost-effective Large Space Telescopes

This paper summarizes efforts underway at the Goddard Space Flight Center to demonstrate a new ty... more This paper summarizes efforts underway at the Goddard Space Flight Center to demonstrate a new type of space telescope architecture that builds on the rigid, segmented telescope heritage of the James Webb Space Telescope but that solves several key challenges for future space telescopes. The architecture is based on a cost-effective segmented spherical primary mirror combined with a unique wavefront sensing and control system that allows for continuous phasing of the primary mirror. The segmented spherical primary allows for cost-effective 3-meter class (eg, Midex and Discovery) missions as well as enables 30-meter telescope solutions that can be manufactured in a reasonable amount of time and for a reasonable amount of money. The continuous wavefront sensing and control architecture enables missions in low-earth-orbit and missions that do not require expensive stable structures and thermal control systems. For the 30-meter class applications, the paper discusses considerations for ...

Research paper thumbnail of Initial technology assessment for the Large-Aperture UV-Optical-Infrared (LUVOIR) mission concept study

Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 2016

The NASA Astrophysics Division's 30-Year Roadmap prioritized a future large-aperture space telesc... more The NASA Astrophysics Division's 30-Year Roadmap prioritized a future large-aperture space telescope operating in the ultra-violet/optical/infrared wavelength regime. The Association of Universities for Research in Astronomy envisioned a similar observatory, the High Definition Space Telescope. And a multi-institution group also studied the Advanced Technology Large Aperture Space Telescope. In all three cases, a broad science case is outlined, combining general astrophysics with the search for biosignatures via direct-imaging and spectroscopic characterization of habitable exoplanets. We present an initial technology assessment that enables such an observatory that is currently being studied for the 2020 Decadal Survey by the Large UV/Optical/Infrared (LUVOIR) surveyor Science and Technology Definition Team. We present here the technology prioritization for the 2016 technology cycle and define the required technology capabilities and current state-of-the-art performance. Current, planned, and recommended technology development efforts are also reported.

Research paper thumbnail of Technology gap assessment for a future large-aperture ultraviolet-optical-infrared space telescope

Journal of Astronomical Telescopes, Instruments, and Systems, 2016

Research paper thumbnail of Wavefront control testbed experimental results

Proceedings of Spie the International Society For Optical Engineering, 2004

Wavefront control testbed experimental results. [Proceedings of SPIE 5487, 918 (2004)]. Laura A. ... more Wavefront control testbed experimental results. [Proceedings of SPIE 5487, 918 (2004)]. Laura A. Burns, Scott A. Basinger, Scott D. Campion, Jessica A. Faust, Lee D. Feinberg, Joseph J. Green, William L. Hayden, Andrew E ...

Research paper thumbnail of James Webb Space Telescope (JWST) Optical Telescope Element (OTE) Architecture and Technology

ABSTRACT A JWST OTE Pathfinder telescope that includes two spare primary mirror segments, a spare... more ABSTRACT A JWST OTE Pathfinder telescope that includes two spare primary mirror segments, a spare secondary mirror, and a large composite structure with a deployed secondary support structure is in the assembly stage and will be fully completed this year. This Pathfinder will check out key steps in the ambient mirror integration process and also be used at the Johnson Space Center (JSC) to check out the optical Ground Support Equipment (GSE) and associated procedures that will be used to test the full JWST telescope and instruments at JSC. This paper will summarize the Pathfinder integration and testing flow, the critical Ground Support Equipment it will test and the key tests planned with the Pathfinder.

Research paper thumbnail of Hybrid Architecture Active Wavefront Sensing and Control System, and Method

Research paper thumbnail of JWST pathfinder telescope integration

Optical Manufacturing and Testing XI, 2015

The James Webb Space Telescope (JWST) is a 6.5m, segmented, IR telescope that will explore the fi... more The James Webb Space Telescope (JWST) is a 6.5m, segmented, IR telescope that will explore the first light of the universe after the big bang. In 2014, a major risk reduction effort related to the Alignment, Integration, and Test (AI&T) of the segmented telescope was completed. The Pathfinder telescope includes two Primary Mirror Segment Assemblies (PMSA's) and the Secondary Mirror Assembly (SMA) onto a flight-like composite telescope backplane. This pathfinder allowed the JWST team to assess the alignment process and to better understand the various error sources that need to be accommodated in the flight build. The successful completion of the Pathfinder Telescope provides a final integration roadmap for the flight operations that will start in August 2015.

Research paper thumbnail of <title>Applying HST lessons learned to JWST</title>

Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter, 2008

Research paper thumbnail of Second HST Servicing Mission: Expanding the New Frontier

Optics and Photonics News, 1997

... Linda Abramowicz-Reed is senior staff engineer at Hughes-Danbury Optical Systems in Danbury, ... more ... Linda Abramowicz-Reed is senior staff engineer at Hughes-Danbury Optical Systems in Danbury, Conn. ... Light enters from the HST focal plane (lower left), is manipulated by the foreoptics subassembly, and then directed to the three detectors inside the dewar (right). ...

Research paper thumbnail of Nanometer level characterization of the James Webb Space Telescope optomechanical systems using high-speed interferometry

Research paper thumbnail of <title>Optical design process and comparison for ATLAST concepts</title>

International Optical Design Conference 2010, 2010

The ATALST (Advanced Technology for Large Aperture Space Telescopes) effort has presented several... more The ATALST (Advanced Technology for Large Aperture Space Telescopes) effort has presented several design incarnations. Here we will discus the design process in detail and compare the design and performance of the 9.2m segmented, the 8m monolithic on-axis and 8m x 6m off-axis concepts.

Research paper thumbnail of <title>Verification of the James Webb Space Telescope (JWST) wavefront sensing and control system</title>

Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter, 2008

From its orbit around the Earth-Sun second Lagrange point some million miles from Earth, the Jame... more From its orbit around the Earth-Sun second Lagrange point some million miles from Earth, the James Webb Space Telescope (JWST) will be uniquely suited to study early galaxy and star formation with its suite of infrared instruments.[1] To maintain exceptional image quality using its 6.6 meter segmented primary mirror, wavefront sensing and control (WFS&C) is vital to ensure the optical alignment of the telescope throughout the mission. After deployment of the observatory structure and mirrors from the "folded" launch configuration, WFS&C is used to align the telescope[2], as well as maintain that alignment. WFS&C verification includes the verification of the software and its incorporated algorithms, along with the supporting aspects of the integrated ground segment, instrumentation, and telescope through increasing levels of assembly. The software and process are verified with the Integrated Telescope Model (ITM), which is a Matlab/Simulink integrated observatory model which interfaces to CodeV/OSLO/IDL. In addition to lower level testing, the Near-Infrared Camera[3] (NIRCam) with its wavefront sensing optical components is verified with the other instruments with a cryogenic optical telescope simulator (OSIM) before moving on to the final WFS&C testing in Chamber A at the Johnson Space Center (JSC) where additional observatory verification occurs.

Research paper thumbnail of New method for characterizing the state of optical and opto-mechanical systems

Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave, 2014

James Webb Space Telescope Optical Telescope Element (OTE) is a three mirror anastigmat consistin... more James Webb Space Telescope Optical Telescope Element (OTE) is a three mirror anastigmat consisting of a 6.5 m primary mirror (PM), secondary mirror (SM) and a tertiary mirror. The primary mirror is made out of 18 segments. The telescope and instruments will be assembled at Goddard Space Flight Center (GSFC) to make it the Optical Telescope Element-Integrated Science Instrument Module (OTIS). The OTIS will go through environmental testing at GSFC before being transported to Johnson Space Center for testing at cryogenic temperature. The objective of the primary mirror Center of Curvature test (CoC) is to characterize the PM before and after the environmental testing for workmanship. This paper discusses the CoC test including both a surface figure test and a new method for characterizing the state of the primary mirror using high speed dynamics interferometry.

Research paper thumbnail of Instantaneous phase-shifted speckle interferometer for measurement of large optical structures

Frontiers in Optics, 2003

ABSTRACT Digital Speckle Pattern Interferometry (DSPI) is a well-established method for the measu... more ABSTRACT Digital Speckle Pattern Interferometry (DSPI) is a well-established method for the measurement of diffuse objects in experimental mechanics. DSPIs are phase shifting interferometers. Three or four bucket temporal phase shifting algorithms are commonly used to provide phase shifting. These algorithms are sensitive to vibrations and can not be used to measure large optical structures far away from the interferometer. In this research a simultaneous phase shifted interferometer, PhaseCam product of 4D Technology Corporation in Tucson Arizona, is modified to be a Simultaneous phase shifted Digital Speckle Pattern Interferometer (SDSPI). Repeatability, dynamic range, and accuracy of the SDSPI are characterized by measuring a 5 cm x 5 cm carbon fiber coupon.

Research paper thumbnail of Wide Field Camera 3 (WFC3) - A Facility Instrument For The Hubble Space Telescope

The planned mission life of the Hubble Space Telescope has recently been extended to 2010. To ins... more The planned mission life of the Hubble Space Telescope has recently been extended to 2010. To insure HST's capabilities to carry out superb imaging at optical and near-UV wavelengths to the end of its life, the HST Project has been authorized to lead the development of a new, radial-bay camera to replace the current Wide Field/Planetary Camera 2 (WFPC2). This new instrument, Wide Field Camera 3, will be inserted into HST during the final servicing mission in late 2002 or early 2003, and will serve as a backup to our primary imaging instrument, the Advanced Camera for Surveys (ACS), which will fly in late 1999 or early 2000. To develop an excellent camera at low cost, extensive use will be made of returned HST flight hardware, flight spare hardware and existing subsystem designs. These include the refurbished outer structure, external thermal radiator, shutter mechanism and filter wheel assembly from WFPC1, which was returned to the ground in 1993. The WFC3 detector will be a 40...

Research paper thumbnail of James Webb Space Telescope: large deployable cryogenic telescope in space

Optical Engineering, 2012

The James Webb Space Telescope (JWST) is an infrared space telescope designed to explore four maj... more The James Webb Space Telescope (JWST) is an infrared space telescope designed to explore four major science themes: first light and reionization, the assembly of galaxies, the birth of stars and protoplanetary systems, and planetary systems and origins of life. JWST is a segmented architecture telescope with an aperture of 6.6 m. It will operate at cryogenic temperature (40 K), achieved via passive cooling, in an orbit about the Earth-Sun second Lagrange point (L2). Passive cooling is facilitated by means of a large sunshield that provides thermal isolation and protection from direct illumination from the Sun. The large size of the telescope and spacecraft systems require that they are stowed for launch in a configuration that fits the Ariane 5 fairing, and then deployed after launch. Routine wavefront sensing and control measurements are used to achieve phasing of the segmented primary mirror and initial alignment of the telescope. A suite of instruments will provide the capability to observe over a spectral range from 0.6-to 27-μm wavelengths with imaging and spectroscopic configurations. An overview is presented of the architecture and selected optical design features of JWST are described.

Research paper thumbnail of Modular assembled space telescope

Optical Engineering, 2013

Research paper thumbnail of Wavefront control testbed experimental results

Proceedings of …, 2004

Wavefront control testbed experimental results. [Proceedings of SPIE 5487, 918 (2004)]. Laura A. ... more Wavefront control testbed experimental results. [Proceedings of SPIE 5487, 918 (2004)]. Laura A. Burns, Scott A. Basinger, Scott D. Campion, Jessica A. Faust, Lee D. Feinberg, Joseph J. Green, William L. Hayden, Andrew E ...

Research paper thumbnail of Measurement of large cryogenic structures using a spatially phase-shifted digital speckle pattern interferometer

Applied Optics, 2008

The James Webb Space Telescope (JWST) Backplane Stability Test Article (BSTA) was developed to de... more The James Webb Space Telescope (JWST) Backplane Stability Test Article (BSTA) was developed to demonstrate large precision cryogenic structures technology readiness for JWST. Its thermal stability was measured at cryogenic temperatures at Marshall Space Flight Center's (MSFC) X-Ray Calibration Facility (XRCF) and included nearly continuous measurements over a six-week period in the summer of 2006 covering the temperature range from ambient down to 30K using the Spatially Phase Shifted Digital Speckle Pattern Interferometer (SPS-DSPI). The BSTA is a full size, one-sixth section of the JWST Primary Mirror Backplane Assembly (PMBA). The BSTA, measuring almost 3 m across, contains most of the prominent structural elements of the backplane, and is the largest structure ever measured with SPS-DSPI at cryogenic conditions. The SPS-DSPI measured rigid body motion and deformations of BSTA to nanometer level accuracy. The SPS-DSPI was developed specifically for the purposes of this test and other tests of large cryogenic structures for JWST.

Research paper thumbnail of Path to a UV/optical/IR flagship: review of ATLAST and its predecessors

Journal of Astronomical Telescopes, Instruments, and Systems, 2016

Our recently completed study for the Advanced Technology Large-Aperture Space Telescope (ATLAST) ... more Our recently completed study for the Advanced Technology Large-Aperture Space Telescope (ATLAST) was the culmination of three years of initially internally funded work that built upon earlier engineering designs, science objectives, and technology priorities. Beginning in the mid-1980s, multiple teams of astronomers, technologists, and engineers developed concepts for a large-aperture UV/optical/IR space observatory intended to follow the Hubble Space Telescope (HST). Here, we summarize since the first significant conferences on major post-HST ultraviolet, optical, and infrared (UVOIR) observatories the history of designs, scientific goals, key technology recommendations, and community workshops. Although the sophistication of science goals and the engineering designs both advanced over the past three decades, we note the remarkable constancy of major characteristics of large post-HST UVOIR concepts. As it has been a priority goal for NASA and science communities for a half-century, and has driven much of the technology priorities for major space observatories, we include the long history of concepts for searching for Earth-like worlds. We conclude with a capsule summary of our ATLAST reference designs developed by four partnering institutions over the past three years, which was initiated in 2013 to prepare for the 2020 National Academies' Decadal Survey.

Research paper thumbnail of Spherical Primary Optical Telescope (SPOT): An Architecture Demonstration for Cost-effective Large Space Telescopes

This paper summarizes efforts underway at the Goddard Space Flight Center to demonstrate a new ty... more This paper summarizes efforts underway at the Goddard Space Flight Center to demonstrate a new type of space telescope architecture that builds on the rigid, segmented telescope heritage of the James Webb Space Telescope but that solves several key challenges for future space telescopes. The architecture is based on a cost-effective segmented spherical primary mirror combined with a unique wavefront sensing and control system that allows for continuous phasing of the primary mirror. The segmented spherical primary allows for cost-effective 3-meter class (eg, Midex and Discovery) missions as well as enables 30-meter telescope solutions that can be manufactured in a reasonable amount of time and for a reasonable amount of money. The continuous wavefront sensing and control architecture enables missions in low-earth-orbit and missions that do not require expensive stable structures and thermal control systems. For the 30-meter class applications, the paper discusses considerations for ...

Research paper thumbnail of Initial technology assessment for the Large-Aperture UV-Optical-Infrared (LUVOIR) mission concept study

Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 2016

The NASA Astrophysics Division's 30-Year Roadmap prioritized a future large-aperture space telesc... more The NASA Astrophysics Division's 30-Year Roadmap prioritized a future large-aperture space telescope operating in the ultra-violet/optical/infrared wavelength regime. The Association of Universities for Research in Astronomy envisioned a similar observatory, the High Definition Space Telescope. And a multi-institution group also studied the Advanced Technology Large Aperture Space Telescope. In all three cases, a broad science case is outlined, combining general astrophysics with the search for biosignatures via direct-imaging and spectroscopic characterization of habitable exoplanets. We present an initial technology assessment that enables such an observatory that is currently being studied for the 2020 Decadal Survey by the Large UV/Optical/Infrared (LUVOIR) surveyor Science and Technology Definition Team. We present here the technology prioritization for the 2016 technology cycle and define the required technology capabilities and current state-of-the-art performance. Current, planned, and recommended technology development efforts are also reported.

Research paper thumbnail of Technology gap assessment for a future large-aperture ultraviolet-optical-infrared space telescope

Journal of Astronomical Telescopes, Instruments, and Systems, 2016

Research paper thumbnail of Wavefront control testbed experimental results

Proceedings of Spie the International Society For Optical Engineering, 2004

Wavefront control testbed experimental results. [Proceedings of SPIE 5487, 918 (2004)]. Laura A. ... more Wavefront control testbed experimental results. [Proceedings of SPIE 5487, 918 (2004)]. Laura A. Burns, Scott A. Basinger, Scott D. Campion, Jessica A. Faust, Lee D. Feinberg, Joseph J. Green, William L. Hayden, Andrew E ...

Research paper thumbnail of James Webb Space Telescope (JWST) Optical Telescope Element (OTE) Architecture and Technology

ABSTRACT A JWST OTE Pathfinder telescope that includes two spare primary mirror segments, a spare... more ABSTRACT A JWST OTE Pathfinder telescope that includes two spare primary mirror segments, a spare secondary mirror, and a large composite structure with a deployed secondary support structure is in the assembly stage and will be fully completed this year. This Pathfinder will check out key steps in the ambient mirror integration process and also be used at the Johnson Space Center (JSC) to check out the optical Ground Support Equipment (GSE) and associated procedures that will be used to test the full JWST telescope and instruments at JSC. This paper will summarize the Pathfinder integration and testing flow, the critical Ground Support Equipment it will test and the key tests planned with the Pathfinder.

Research paper thumbnail of Hybrid Architecture Active Wavefront Sensing and Control System, and Method

Research paper thumbnail of JWST pathfinder telescope integration

Optical Manufacturing and Testing XI, 2015

The James Webb Space Telescope (JWST) is a 6.5m, segmented, IR telescope that will explore the fi... more The James Webb Space Telescope (JWST) is a 6.5m, segmented, IR telescope that will explore the first light of the universe after the big bang. In 2014, a major risk reduction effort related to the Alignment, Integration, and Test (AI&T) of the segmented telescope was completed. The Pathfinder telescope includes two Primary Mirror Segment Assemblies (PMSA's) and the Secondary Mirror Assembly (SMA) onto a flight-like composite telescope backplane. This pathfinder allowed the JWST team to assess the alignment process and to better understand the various error sources that need to be accommodated in the flight build. The successful completion of the Pathfinder Telescope provides a final integration roadmap for the flight operations that will start in August 2015.

Research paper thumbnail of <title>Applying HST lessons learned to JWST</title>

Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter, 2008

Research paper thumbnail of Second HST Servicing Mission: Expanding the New Frontier

Optics and Photonics News, 1997

... Linda Abramowicz-Reed is senior staff engineer at Hughes-Danbury Optical Systems in Danbury, ... more ... Linda Abramowicz-Reed is senior staff engineer at Hughes-Danbury Optical Systems in Danbury, Conn. ... Light enters from the HST focal plane (lower left), is manipulated by the foreoptics subassembly, and then directed to the three detectors inside the dewar (right). ...

Research paper thumbnail of Nanometer level characterization of the James Webb Space Telescope optomechanical systems using high-speed interferometry

Research paper thumbnail of <title>Optical design process and comparison for ATLAST concepts</title>

International Optical Design Conference 2010, 2010

The ATALST (Advanced Technology for Large Aperture Space Telescopes) effort has presented several... more The ATALST (Advanced Technology for Large Aperture Space Telescopes) effort has presented several design incarnations. Here we will discus the design process in detail and compare the design and performance of the 9.2m segmented, the 8m monolithic on-axis and 8m x 6m off-axis concepts.

Research paper thumbnail of <title>Verification of the James Webb Space Telescope (JWST) wavefront sensing and control system</title>

Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter, 2008

From its orbit around the Earth-Sun second Lagrange point some million miles from Earth, the Jame... more From its orbit around the Earth-Sun second Lagrange point some million miles from Earth, the James Webb Space Telescope (JWST) will be uniquely suited to study early galaxy and star formation with its suite of infrared instruments.[1] To maintain exceptional image quality using its 6.6 meter segmented primary mirror, wavefront sensing and control (WFS&C) is vital to ensure the optical alignment of the telescope throughout the mission. After deployment of the observatory structure and mirrors from the "folded" launch configuration, WFS&C is used to align the telescope[2], as well as maintain that alignment. WFS&C verification includes the verification of the software and its incorporated algorithms, along with the supporting aspects of the integrated ground segment, instrumentation, and telescope through increasing levels of assembly. The software and process are verified with the Integrated Telescope Model (ITM), which is a Matlab/Simulink integrated observatory model which interfaces to CodeV/OSLO/IDL. In addition to lower level testing, the Near-Infrared Camera[3] (NIRCam) with its wavefront sensing optical components is verified with the other instruments with a cryogenic optical telescope simulator (OSIM) before moving on to the final WFS&C testing in Chamber A at the Johnson Space Center (JSC) where additional observatory verification occurs.

Research paper thumbnail of New method for characterizing the state of optical and opto-mechanical systems

Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave, 2014

James Webb Space Telescope Optical Telescope Element (OTE) is a three mirror anastigmat consistin... more James Webb Space Telescope Optical Telescope Element (OTE) is a three mirror anastigmat consisting of a 6.5 m primary mirror (PM), secondary mirror (SM) and a tertiary mirror. The primary mirror is made out of 18 segments. The telescope and instruments will be assembled at Goddard Space Flight Center (GSFC) to make it the Optical Telescope Element-Integrated Science Instrument Module (OTIS). The OTIS will go through environmental testing at GSFC before being transported to Johnson Space Center for testing at cryogenic temperature. The objective of the primary mirror Center of Curvature test (CoC) is to characterize the PM before and after the environmental testing for workmanship. This paper discusses the CoC test including both a surface figure test and a new method for characterizing the state of the primary mirror using high speed dynamics interferometry.

Research paper thumbnail of Instantaneous phase-shifted speckle interferometer for measurement of large optical structures

Frontiers in Optics, 2003

ABSTRACT Digital Speckle Pattern Interferometry (DSPI) is a well-established method for the measu... more ABSTRACT Digital Speckle Pattern Interferometry (DSPI) is a well-established method for the measurement of diffuse objects in experimental mechanics. DSPIs are phase shifting interferometers. Three or four bucket temporal phase shifting algorithms are commonly used to provide phase shifting. These algorithms are sensitive to vibrations and can not be used to measure large optical structures far away from the interferometer. In this research a simultaneous phase shifted interferometer, PhaseCam product of 4D Technology Corporation in Tucson Arizona, is modified to be a Simultaneous phase shifted Digital Speckle Pattern Interferometer (SDSPI). Repeatability, dynamic range, and accuracy of the SDSPI are characterized by measuring a 5 cm x 5 cm carbon fiber coupon.

Research paper thumbnail of Wide Field Camera 3 (WFC3) - A Facility Instrument For The Hubble Space Telescope

The planned mission life of the Hubble Space Telescope has recently been extended to 2010. To ins... more The planned mission life of the Hubble Space Telescope has recently been extended to 2010. To insure HST's capabilities to carry out superb imaging at optical and near-UV wavelengths to the end of its life, the HST Project has been authorized to lead the development of a new, radial-bay camera to replace the current Wide Field/Planetary Camera 2 (WFPC2). This new instrument, Wide Field Camera 3, will be inserted into HST during the final servicing mission in late 2002 or early 2003, and will serve as a backup to our primary imaging instrument, the Advanced Camera for Surveys (ACS), which will fly in late 1999 or early 2000. To develop an excellent camera at low cost, extensive use will be made of returned HST flight hardware, flight spare hardware and existing subsystem designs. These include the refurbished outer structure, external thermal radiator, shutter mechanism and filter wheel assembly from WFPC1, which was returned to the ground in 1993. The WFC3 detector will be a 40...

Research paper thumbnail of James Webb Space Telescope: large deployable cryogenic telescope in space

Optical Engineering, 2012

The James Webb Space Telescope (JWST) is an infrared space telescope designed to explore four maj... more The James Webb Space Telescope (JWST) is an infrared space telescope designed to explore four major science themes: first light and reionization, the assembly of galaxies, the birth of stars and protoplanetary systems, and planetary systems and origins of life. JWST is a segmented architecture telescope with an aperture of 6.6 m. It will operate at cryogenic temperature (40 K), achieved via passive cooling, in an orbit about the Earth-Sun second Lagrange point (L2). Passive cooling is facilitated by means of a large sunshield that provides thermal isolation and protection from direct illumination from the Sun. The large size of the telescope and spacecraft systems require that they are stowed for launch in a configuration that fits the Ariane 5 fairing, and then deployed after launch. Routine wavefront sensing and control measurements are used to achieve phasing of the segmented primary mirror and initial alignment of the telescope. A suite of instruments will provide the capability to observe over a spectral range from 0.6-to 27-μm wavelengths with imaging and spectroscopic configurations. An overview is presented of the architecture and selected optical design features of JWST are described.

Research paper thumbnail of Modular assembled space telescope

Optical Engineering, 2013

Research paper thumbnail of Wavefront control testbed experimental results

Proceedings of …, 2004

Wavefront control testbed experimental results. [Proceedings of SPIE 5487, 918 (2004)]. Laura A. ... more Wavefront control testbed experimental results. [Proceedings of SPIE 5487, 918 (2004)]. Laura A. Burns, Scott A. Basinger, Scott D. Campion, Jessica A. Faust, Lee D. Feinberg, Joseph J. Green, William L. Hayden, Andrew E ...

Research paper thumbnail of Measurement of large cryogenic structures using a spatially phase-shifted digital speckle pattern interferometer

Applied Optics, 2008

The James Webb Space Telescope (JWST) Backplane Stability Test Article (BSTA) was developed to de... more The James Webb Space Telescope (JWST) Backplane Stability Test Article (BSTA) was developed to demonstrate large precision cryogenic structures technology readiness for JWST. Its thermal stability was measured at cryogenic temperatures at Marshall Space Flight Center's (MSFC) X-Ray Calibration Facility (XRCF) and included nearly continuous measurements over a six-week period in the summer of 2006 covering the temperature range from ambient down to 30K using the Spatially Phase Shifted Digital Speckle Pattern Interferometer (SPS-DSPI). The BSTA is a full size, one-sixth section of the JWST Primary Mirror Backplane Assembly (PMBA). The BSTA, measuring almost 3 m across, contains most of the prominent structural elements of the backplane, and is the largest structure ever measured with SPS-DSPI at cryogenic conditions. The SPS-DSPI measured rigid body motion and deformations of BSTA to nanometer level accuracy. The SPS-DSPI was developed specifically for the purposes of this test and other tests of large cryogenic structures for JWST.