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  • 1
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    Analysis of Random Segment Errors on Coronagraph Performance (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: At 2015 SPIE O&P we presented "Preliminary Analysis of Random Segment Errors on Coronagraph Performance" Key Findings: Contrast Leakage for 4thorder Sinc2(X) coronagraph is 10X more sensitive to random segment piston than random tip/tilt, Fewer segments (i.e. 1 ring) or very many segments (〉 16 rings) has less contrast leakage as a function of piston or tip/tilt than an aperture with 2 to 4 rings of segments. Revised Findings: Piston is only 2.5X more sensitive than Tip/Tilt
    Keywords: Instrumentation and Photography
    Type: MSFC-E-DAA-TN32194
    Format: application/pdf
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  • 2
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    James Webb Space Telescope: The First Light Machine (2007)
    In:  CASI
    Details
    Publication Date: 2018-06-12
    Description: Scheduled to begin its 10 year mission no sooner than 2013, the James Webb Space Telescope (JWST) will search for the first luminous objects of the Universe to help answer fundamental questions about how the Universe came to look like it does today. At 6.5 meters in diameter, JWST will be the world's largest space telescope. This talk reviews science objectives for JWST and how they drive the JWST architecture, e.g. aperture, wavelength range and operating temperature. Additionally, the talk provides an overview of the JWST primary mirror technology development and fabrication status.
    Keywords: Instrumentation and Photography
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  • 3
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    Summary of the NASA Science Instrument, Observatory and Sensor System (SIOSS) Technology Assessment (2011)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Technology advancement is required to enable NASA's high priority missions of the future. To prepare for those missions requires a roadmap of how to get from the current state of the art to where technology needs to be in 5, 10, 15 and 20 years. SIOSS identifies where substantial enhancements in mission capabilities are needed and provides strategic guidance for the agency's budget formulation and prioritization process.
    Keywords: Instrumentation and Photography
    Type: M11-1090 , NASA Cosmic Origins Program Analysis Group (COPAG) Meeting; Sep 22, 2011 - Sep 23, 2011; Baltimore, MD; United States
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  • 4
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    The Advanced Technology Large Aperture Space Telescope (ATLAST): Science Drivers, Technology Developments, and Synergies with Other Future Facilities (2011)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: The Advanced Technology Large-Aperture Space Telescope (ATLAST) is a concept for an 8-meter to 16-meter UVOIR space observatory for launch in the 2025-2030 era. ATLAST will allow astronomers to answer fundamental questions at the forefront of modern astrophysics, including "Is there life elsewhere in the Galaxy?" We present a range of science drivers that define the main performance requirements for ATLAST (8 to 16 milliarcsec angular resolution, diffraction limited imaging at 0.5 m wavelength, minimum collecting area of 45 square meters, high sensitivity to light wavelengths from 0.1 m to 2.4 m, high stability in wavefront sensing and control). We will also discuss the synergy between ATLAST and other anticipated future facilities (e.g., TMT, EELT, ALMA) and the priorities for technology development that will enable the construction for a cost that is comparable to current generation observatory-class space missions.
    Keywords: Instrumentation and Photography
    Type: GSFC.JA.5210.2011
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  • 5
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    Cost Modeling for Space Telescope (2011)
    In:  CASI
    Details
    Publication Date: 2019-07-19
    Description: Parametric cost models are an important tool for planning missions, compare concepts and justify technology investments. This paper presents on-going efforts to develop single variable and multi-variable cost models for space telescope optical telescope assembly (OTA). These models are based on data collected from historical space telescope missions. Standard statistical methods are used to derive CERs for OTA cost versus aperture diameter and mass. The results are compared with previously published models.
    Keywords: Instrumentation and Photography
    Type: M11-0380 , International Commission for Optics: (ICO) 22 General Congress; Aug 15, 2011 - Aug 19, 2011; Puebla; Mexico
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  • 6
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    Sub-pixel spatial resolution wavefront phase imaging (2012)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A phase imaging method for an optical wavefront acquires a plurality of phase images of the optical wavefront using a phase imager. Each phase image is unique and is shifted with respect to another of the phase images by a known/controlled amount that is less than the size of the phase imager's pixels. The phase images are then combined to generate a single high-spatial resolution phase image of the optical wavefront.
    Keywords: Instrumentation and Photography
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  • 7
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    HERO: A Balloon-Borne Focusing Hard X-Ray Telescope (2008)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This viewgraph presentation describes the HERO balloon-borne payload configuration, instrument specifications, flight operations, sensitivity analyses, and future flight plans.
    Keywords: Instrumentation and Photography
    Type: ICO-21 2008 Congress "Optics for the 21st Century" (International Commission for Optics); Jul 07, 2008 - Jul 10, 2008; Sydney; Australia
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  • 8
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    A Future Large-Aperture UVOIR Space Observatory: Reference Designs (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Our joint NASA GSFC/JPL/MSFC/STScI study team has used community-provided science goals to derive mission needs, requirements, and candidate mission architectures for a future large-aperture, non-cryogenic UVOIR space observatory. We describe the feasibility assessment of system thermal and dynamic stability for supporting coronagraphy. The observatory is in a Sun-Earth L2 orbit providing a stable thermal environment and excellent field of regard. Reference designs include a 36-segment 9.2 m aperture telescope that stows within a five meter diameter launch vehicle fairing. Performance needs developed under the study are traceable to a variety of reference designs including options for a monolithic primary mirror.
    Keywords: Instrumentation and Photography
    Type: GSFC-E-DAA-TN25409 , SPIE Optics + Photonics: Optical Engineering + Applications; Aug 09, 2015 - Aug 13, 2015; San Diego, CA; United States|Proceedings of SPIE, UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts VII (ISSN 0277-786X); 9602; 960205
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  • 9
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    JWST Lightweight Mirror TRL-6 Results (2007)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Mirror technology for a Primary Mirror Segment Assembly (PMSA) is a system of components: reflective coating; polished optical surface; mirror substrate; actuators, mechanisms and flexures; and reaction structure. The functional purpose of a PMSA is to survive launch, deploy and align itself to form a 25 square meter collecting area 6.5 meter diameter primary mirror with a 131 nm rms wavefront error at temperatures less than 50K and provide stable optical performance for the anticipated thermal environment. At the inception of JWST in 1996, such a capability was at a Technology Readiness Level (TRL) of 3. A highly successful technology development program was initiated including the Sub-scale Beryllium Mirror Demonstrator (SBMD) and Advanced Mirror System Demonstrator (AMSD) projects. These projects along with flight program activities have matured mirror technology for JWST to TRL-6. A directly traceable prototype (and in some cases the flight hardware itself) has been built, tested and operated in a relevant environment.
    Keywords: Instrumentation and Photography
    Type: 2007 IEEE Aerospace Conference; Mar 03, 2007 - Mar 10, 2007; Big Sky, MT; United States
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  • 10
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    Development of Stacked Core Technology for the Fabrication of Deep Lightweight UV Quality Space Mirrors (2013)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Decadal Survey stated that an advanced large-aperture ultraviolet, optical, near-infrared (UVOIR) telescope is required to enable the next generation of compelling astrophysics and exoplanet science; and, that present technology is not mature enough to affordably build and launch any potential UVOIR mission concept. Under Science and Technology funding, NASA's Marshall Space Flight Center (MSFC) and ITT Exelis have developed a more cost effective process to make up to 4m monolithic spaceflight UV quality, low areal density, thermally and dynamically stable primary mirrors. A proof of concept mirror was completed at ITT Exelis and tested down to 250K at MSFC which would allow imaging out to 2.5 microns. The parameters and test results of this concept mirror will be shown. The scale-up process will be discussed and the technology development path to a 4m mirror system by 2018 will also be outlined.
    Keywords: Instrumentation and Photography
    Type: M13-2782 , 2013 SPIE Optics and Photonics Exhibition; Aug 25, 2013 - Aug 29, 2013; San Diego, CA; United States
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