James Webb Space

Infrared detectors can be made with several layer AR coatings, and the detectors for the James Webb Space Telescope, awarded to Rockwell Scientific, specify 4- or 5-layer coatings to achieve QE of 95% over a broad bandpass. 

Current plans call for decommissioning of the HSTin 2010, a year before it is scheduled to be replaced by NASA s new James Webb Space Telescope. In order to keep the HSTin the best possible condition, anywhere from one to three maintenance trips are planned, probably to be carried out by a space shuttle. A number of astronomers are arguing for keeping the HST in orbit beyond 2010, however. They point to the instrument s numerous accomplishments and suggest that it still has much to contribute to the advancement of astronomical knowledge. 

The James Webb Space Telescope home-page, http //ngst.gsfc.nasa.gov/. 

Fig. 1.5 (Le ) Artist conception of the ALMA array with roads, in the extended configuration. Credit ALMA (ESO/NAOJ/NRAO). (Right) Model of the James Webb Space Telescope, located at NASA Goddard Space Flight Center...

An attribute of cfrp is its low thermal expansion and combined with structural rigidity, a graphite/epoxy composite was selected for the main structure of the Hubble Telescope [86]. The successor to the Hubble will be the James Webb Space Telescope, with backing struts and mirror support struts made from a carbon hybrid composite to operate at temperatures in the region of —235°C. 

Laser interferometers will be used to measure the optical quality of the mirror used in the James Webb Space Telescope, scheduled to launch in 2014. The surface smoothness must be unprecedented If the mirror were scaled up to a size of 3,000 miles across, the surface height would be allowed to vary only by a foot at most. 

National Aeronautics and Space Administration James Webb Space Telescope http / Zwww.jwst.nasa.gov... 

As wireless technology advances it seems possible that this technology may replace some of the millions of miles of fiber-optic telecommunications cables that currently exist. Because of their reliability, fiber optics will continue to be used for the foreseeable future. Existing lasers will continue to be to optimized, and most likely new lasers will be developed. With the launch of the James Webb Space Telescope in 2014, the understanding of the solar system and space will be further advanced. 

Fig. 2.8 Sketches of planned or proposed future telescopes. From left to right, top row. the space telescopes JWST (James Webb Space Telescope, currently in construction, image credit NASA) and SPICA (JAXA project, image credit JAXA) bottom row. the ground based telescopes ALMA (in construction, image credit ESO/NOAJ/NRAO), Extremely Large Telescope (ELT, ESO project). Plateau de Bure Interferometer (PdBI) (in operation, proposal for extension as NOEMA, image credit IRAM)...

The James Webb Space Telescope (JWST) is a large, infrared-optimized space telescope. JWST will have a large mirror, 6.5 meters (21.3 feet) in diameter and a sunshield the size of a tennis court. The telescope will be placed at one of the... 

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