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Randal Telfer, M. Meléndez, Nicolas Flagey, Charles-Philippe Lajoie et autres
Based on phase retrieval of defocused point source images from JWST commissioning, routine maintenance, and science data, we characterize components of the JWST OTE wavefront error variations over a wide range of time scales, including the accumulation of segment pose changes (tilt …
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Charles-Philippe Lajoie, Matthew Lallo, M. Meléndez, Nicolas Flagey et autres
We summarize JWST's measured telescope performance across science Cycle 1. The stability of segments alignments is typically better than 10 nanometers RMS between measurements every two days, leading to highly stable point spread functions. The frequency of segment "tilt events" decreased significantly, …
Jonathan P. Gardner, John C. Mather, R. Abbott, James S. Abell et autres
Abstract Twenty-six years ago a small committee report, building on earlier studies, expounded a compelling and poetic vision for the future of astronomy, calling for an infrared-optimized space telescope with an aperture of at least 4 m. With the support of their …
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Michael W. McElwain, Lee D. Feinberg, Marshall D. Perrin, Mark Clampin et autres
Abstract The James Webb Space Telescope (JWST) is a large, infrared space telescope that has recently started its science program which will enable breakthroughs in astrophysics and planetary science. Notably, JWST will provide the very first observations of the earliest luminous objects …
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Jonathan P. Gardner, John C. Mather, R. Abbott, James S. Abell et autres
Twenty-six years ago a small committee report, building on earlier studies, expounded a compelling and poetic vision for the future of astronomy, calling for an infrared-optimized space telescope with an aperture of at least $4m$. With the support of their governments in …
Michael W. McElwain, Lee D. Feinberg, Marshall D. Perrin, Mark Clampin et autres
The James Webb Space Telescope (JWST) is a large, infrared space telescope that has recently started its science program which will enable breakthroughs in astrophysics and planetary science. Notably, JWST will provide the very first observations of the earliest luminous objects in …
CdSe crystals grown by the vapor-deposition method show a cathodoluminescence spectrum at 5\ifmmode^\circ\else\textdegree\fi{}K with peaks at 1.34 and 1.74 eV. Under electron bombardment, above an energy threshold of 320 keV, a new emission band at about 1.1 eV is produced. An isochronal …
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The electrical and luminescence properties of CdS crystals, which show the phenomenon of storage, have been studied as a function of hydrostatic pressure and uniaxial stress. In the excited state, uniaxial stress applied parallel to the $c$ axis resulted in an irreversible …
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A threshold for electron radiation damage in CdSe is observed at 250 keV. A fluorescence emission band is produced with a peak intensity at 1.25 μ. Only a slight amount of annealing takes place up to 125°C. Above 150°C the fluorescence band …
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Electron bombardment of ZnSe at 80\ifmmode^\circ\else\textdegree\fi{}K results in the production of two fluorescence bands at 5460 and 5850 \AA{}. The threshold for damage at 80\ifmmode^\circ\else\textdegree\fi{}K is 240 keV. When the sample is cooled to 4.2\ifmmode^\circ\else\textdegree\fi{}K following bombardment at 80\ifmmode^\circ\else\textdegree\fi{}K the fluorescence spectrum …
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B. A. Kulp, K. A. Gale, R. G. Schulze
The transport properties of electrons in CdS grown with Group I impurities which show the phenomenon of "storage" have been studied to determine the mechanism of conduction. The mobility parallel to the $c$ axis at low temperature is of the order of …
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