An overview of the James Webb Space Telescope (JWST) project

Sabelhaus, Phillip A.; Campbell, Doug; Clampin, Mark; Decker, J.; Greenhouse, M. A.; Johns, Alan; Menzel, Mike; Smith, Robert C.; Sullivan, Pam

doi:10.1117/12.549895

Cited by 57 publications

(10 citation statements)

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“…Successor to the Hubble Space Telescope, the James Webb Space Telescope 15 is a large, infrared-optimized space telescope scheduled for launch in August, 2011 (Sabelhaus & Decker 2004). JWST will have a large mirror, 6.5 meters in diameter.…”

Section: Jwstmentioning

confidence: 99%

Cosmic infrared background and early galaxy evolution

2005

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Section: Jwstmentioning

confidence: 99%

Cosmic infrared background and early galaxy evolution

2005

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“…The STScI is the science and operations center. The responsibilities of the major JWST partners are given in Table XV (Sabelhaus and Decker, 2004).…”

Section: Managementmentioning

confidence: 99%

“…The IMF is a key product of star formation (Salpeter, 1955;Miller and Scalo, 1979). Remarkably, the IMF is almost entirely feature-free, all the way from the most massive stars down to ∼0.3M .…”

Section: What Is the Initial Mass Function At Sub-stellar Masses?mentioning

confidence: 99%

The James Webb Space Telescope

et al. 2006

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Abstract. The James Webb Space Telescope (JWST) is a large (6.6 m), cold (<50 K), infrared (IR)-optimized space observatory that will be launched early in the next decade into orbit around the second Earth-Sun Lagrange point. The observatory will have four instruments: a near-IR camera, a near-IR multiobject spectrograph, and a tunable filter imager will cover the wavelength range, 0.6 < λ < 5.0 μm, while the mid-IR instrument will do both imaging and spectroscopy from 5.0 < λ < 29 μm.The JWST science goals are divided into four themes. The key objective of The End of the Dark Ages: First Light and Reionization theme is to identify the first luminous sources to form and to determine the ionization history of the early universe. The key objective of The Assembly of Galaxies theme is to determine how galaxies and the dark matter, gas, stars, metals, morphological structures, Space Science Reviews (2006) and active nuclei within them evolved from the epoch of reionization to the present day. The key objective of The Birth of Stars and Protoplanetary Systems theme is to unravel the birth and early evolution of stars, from infall on to dust-enshrouded protostars to the genesis of planetary systems. The key objective of the Planetary Systems and the Origins of Life theme is to determine the physical and chemical properties of planetary systems including our own, and investigate the potential for the origins of life in those systems. Within these themes and objectives, we have derived representative astronomical observations. To enable these observations, JWST consists of a telescope, an instrument package, a spacecraft, and a sunshield. The telescope consists of 18 beryllium segments, some of which are deployed. The segments will be brought into optical alignment on-orbit through a process of periodic wavefront sensing and control. The instrument package contains the four science instruments and a fine guidance sensor. The spacecraft provides pointing, orbit maintenance, and communications. The sunshield provides passive thermal control. The JWST operations plan is based on that used for previous space observatories, and the majority of JWST observing time will be allocated to the international astronomical community through annual peer-reviewed proposal opportunities.

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“…In recent years, the largest terrestrial telescopes operating in a wide spectral range of wavelengths use the technology of segmented composite mirrors [1][2][3][4]. A typical representative of this class is the Keck Observatory of two telescopes (Keck Telescope) Mauna Kea, Hawaii (1996), in which two 10 meter mirrors consist of 36 segments.…”

Section: Introductionmentioning

confidence: 99%

Algorithm and mathematical model for geometric positioning of segments on aspherical composite mirror

Conquet

Zambrano

Artyukhina

et al. 2018

Prib. metody izmer.

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In recent years, the largest terrestrial and orbital telescopes operating in a wide spectral range of wavelengths use the technology of segmented composite elements to form the main mirror. This approach allows: to expand the spectral operating range from 0.2 to 11.0 μm and to increase the diameter of the entrance pupil of the receiving optical system, while maintaining the optimal value of the exponent m S-mass per unit area. Two variants of adjusting the position of mirror segments are considered when forming an aspherical surface of the second order, with respect to the base surface of the nearest sphere, including geometrical and opto-technical positioning. The purpose of the research was to develop an algorithm for solving the problem of geometric positioning of hexagonal segments of a mirror telescope, constructing an optimal circuit for traversing elements when aligning to the nearest radius to an aspherical surface, and also to program the output calculation parameters to verify the adequacy of the results obtained. Various methods for forming arrays from regular hexagonal segments with equal air gaps between them are considered. The variant of construction of arrays through concentric rings of an equal step is offered. A sequential three-step method for distributing mosaic segments is presented when performing calculations for aligning the aspherical surface: multipath linear; multipath point; block trapezoidal. In the course of mathematical modeling an algorithm was developed to solve the problem of geometric positioning of flat hexagonal segments of a mirror telescope. In the Python programming language, program loops are designed to form the data array necessary to construct a specular reflective surface of a given aperture. In the software package Zemax, the convergence of optical beams from flat hexagonal elements to the central region of the aspherical surface is verified.

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An overview of the James Webb Space Telescope (JWST) project

Cited by 57 publications

References 0 publications

Cosmic infrared background and early galaxy evolution

Cosmic infrared background and early galaxy evolution

The James Webb Space Telescope

Algorithm and mathematical model for geometric positioning of segments on aspherical composite mirror

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