SNAP Telescope

Lampton, M.; Akerlof, C.; Aldering, Greg; Amanullah, R.; Astier, P.; Barrelet, E.; Bebek, C.; Bergström, Lars; Bercovitz, J.; Bernstein, G. M.; Bester, M.; Bonissent, A.; Bower, C. R.; Carithers, W.; Commins, Eugene D.; Day, C. T.; Deustua, Susana E.; DiGennaro, R.; Ealet, A.; Ellis, Richard S.; Fruchter, A.; Genat, J. F.; Goldhaber, G.; Goobar, A.; Groom, D. E.; Harris, S.; Heetderks, H.; Holland, Steven E.; Huterer, Dragan; Karcher, A.; Kim, Alex; Kolbe, W.; Krieger, B.; Lafever, R.; Lamoureux, J.I.; Levi, Michael; Levin, D.; Linder, Eric V.; Loken, S.; Malina, Roger F.; Massey, Richard; McKay, Timothy A.; Kee, S. P. Mc; Miquel, R.; Mörtsell, Edvard; Mostek, N.; Mufson, S.; Musser, J.; Nugent, P.; Oluseyi, Hakeem M.; Pain, R.; Palaio, N.; Pankow, D.; Perlmutter, S.; Pratt, R.; Prieto, Éric; Réfrégier, Alexandre; Rhodes, Jason; Robinson, K.; Roe, Natalie A.; Sholl, Michael; Schubnell, M.; Smadja, G.; Smoot, George F.; Spadafora, A. L.; Tarlè, G.; Tomasch, A.; Lippe, H. von der; Vincent, R. Anthony; Walder, J.-P.; Wang, Guobin

doi:10.1117/12.460074

Cited by 16 publications

(4 citation statements)

References 7 publications

(7 reference statements)

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“…In addition, accurate measurements of galaxy shapes require a FWHM sampling of at least 2 × 2 pixels for a proper PSF deconvolution. 14 To assess the above scientific requirements, we studied a baseline model consisting of a 2 meter telescope similar to the one suggested for SNAP 19 (SuperNova/Acceleration Probe). We intend to cover 5000 deg 2 with an exposure time of 4 ks per filter.…”

Section: Weak Lensing Scientific Requirementsmentioning

confidence: 99%

DEMON: a proposal for a satellite-borne experiment to study dark matter and dark energy

et al. 2006

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We outline a novel satellite mission concept, DEMON, aimed at advancing our comprehension of both dark matter and dark energy, taking full advantage of two complementary methods: weak lensing and the statistics of galaxy clusters. We intend to carry out a 5000 deg 2 combined IR, optical and X-ray survey with galaxies up to a redshift of z ∼ 2 in order to determine the shear correlation function. We will also find ∼ 100000 galaxy clusters, making it the largest survey of this type to date. The DEMON spacecraft will comprise one IR/optical and eight X-ray telescopes, coupled to multiple cameras operating at different frequency bands. To a great extent, the technology employed has already been partially tested on ongoing missions, therefore ensuring improved reliability.

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Section: Weak Lensing Scientific Requirementsmentioning

confidence: 99%

DEMON: a proposal for a satellite-borne experiment to study dark matter and dark energy

et al. 2006

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“…The surface shape of a reflector manufactured under ground gravity constraints will change after the camera enters orbit, due to the release of gravity [1][2][3][4][5]. The traditional ways of manufacturing and testing optical mirrors are implemented separately, which cause great risks, especially when the workpiece is turned over or moved to another place for testing [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Stiffness Analysis and Verification of Hydraulic Supporting Units for In-Situ Optical Testing of a 500 mm-Diameter Mirror

Dong

Zhou

Jiang³

et al. 2022

Machines

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A hydraulic in-situ support system is commonly used in the optical testing of mirrors, since it is convenient to unload the gravity of a mirror to be measured without the risk of being turned over or moved to another place. The existing supporting structures have several disadvantages, such as the problem of the output force deviating from the axis, being sensitive to machining loads, its flexible components easily leading to fatigue damage by cyclic loads and so on. A new single-cylinder hydraulic supporting unit with a ball hinge was proposed, analyzed and verified in this paper. A finite simulation based on four structural parameters’ effect on the stiffness of the proposed hydraulic supporting unit showed that increasing the thickness, elastic modulus and convolution width of the rolling diaphragm and decreasing the height of the rolling diaphragm to some extent was beneficial to a high stiffness. Moreover, it could be concluded from experiments that, in order to decrease the stiffness dispersion, the air ratio should be as low as possible and the values of the initial pressure and press speed should be as high as possible. These results are conducive to maintain a high stiffness of HSU to bear the processing load and reduce the low-order aberrations of mirror which provide a reference for future hydraulic supporting unit designs.

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“…The NIR range (900 nm to 1700 nm) is measured with HgCdTe devices. The HgCdTe devices have a fixed pixel size of 18 µm and the telescope optics are designed to give an angular pixel size of 0.17 arcsec, a good match to the telescope diffraction limit at 1700 nm [6]. We have selected 10.5 mm pixels for the CCDs to provide better sampling of the reduced Airy disk in the visible region.…”

Section: Imagermentioning

confidence: 99%

“…2 field of view, illuminates a 500 mm diameter focal plane [4]. Discovery and photometric follow-up are automatically accomplished with the large field of view imager that repetitively scans a fixed region of sky.…”

Section: Instrument Conceptmentioning

confidence: 99%

SNAP satellite focal plane development

Bebek

Akerlof

Aldering

et al. 2003

UV/EUV and Visible Space Instrumentation for Astronomy II

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The proposed SuperNova/Acceleration Probe (SNAP) mission will have a two-meter class telescope delivering diffraction-limited images to an instrumented 0.7 square degree field in the visible and near-infrared wavelength regime. The requirements for the instrument suite and the present configuration of the focal plane concept are presented. A two year R&D phase, largely supported by the Department of Energy, is just beginning. We describe the development activities that are taking place to advance our preparedness for mission proposal in the areas of detectors and electronics.

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SNAP Telescope

Cited by 16 publications

References 7 publications

DEMON: a proposal for a satellite-borne experiment to study dark matter and dark energy

DEMON: a proposal for a satellite-borne experiment to study dark matter and dark energy

Stiffness Analysis and Verification of Hydraulic Supporting Units for In-Situ Optical Testing of a 500 mm-Diameter Mirror

SNAP satellite focal plane development

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