The Integrated Science Instrument Module (ISIM) of the James Webb Space Telescope (JWST) is discussed from a
systems perspective with emphasis on development status and advanced technology aspects. The ISIM is one of
three elements that comprise the JWST space vehicle and is the science instrument payload of the JWST. The major
subsystems of this flight element and their build status are described.
KEYWORDS: Cryogenics, Interfaces, James Webb Space Telescope, Space telescopes, Sensors, Data acquisition, Telescopes, Composites, Space operations, Image processing
The Integrated Science Instrument Module (ISIM) of the James Webb Space Telescope (JWST) is discussed from a
systems perspective with emphasis on development status and advanced technology aspects. The ISIM is one of three
elements that comprise the JWST space vehicle and is the science instrument payload of the JWST. The major
subsystems of this flight element and their build status are described.
KEYWORDS: Cryogenics, James Webb Space Telescope, Interfaces, Sensors, Space telescopes, Telescopes, Data acquisition, Space operations, Composites, Image processing
The Integrated Science Instrument Module (ISIM) of the James Webb Space Telescope (JWST) is discussed from a
systems perspective with emphasis on development status and advanced technology aspects. The ISIM is one of
three elements that comprise the JWST space vehicle and is the science instrument payload of the JWST. The major
subsystems of this flight element and their build status are described.
The Mid Infrared Instrument (MIRI), one of the four instruments on the Integrated Science Instrument Module (ISIM) of
the James Webb Space Telescope (JWST), supports all of the science objectives of the observatory. MIRI optical
alignment is an important step in the verification process, directly affecting mission success. The MIRI optical alignment
is verified on the ground at the integrated ISIM level using an element in the MIRI Filter Wheel, the pupil alignment
reference (PAR), developed by NASA GSFC and provided to MIRI. It is a ~2.3g aluminum piece that has a flat,
specularly reflective, 3mm diameter surface in its center, with laser-etched fiducials within its aperture. The PAR is
illuminated via an optical stimulus (ground support equipment) and imaged using a pupil imaging camera, during the
ISIM test program in order to determine absolute and relative changes in the alignment that impact pupil shear and roll.
Here we describe the MIRI PAR; its physical properties and challenges during its design, manufacturing, and testing.
The Integrated Science Instrument Module (ISIM) for the James Webb Space Telescope (JWST) provides the critical
functions and the environment for the four science instruments on JWST. This complex system development across
many international organizations presents unique challenges and unique solutions. Here we describe how the
requirement flow has been coordinated through the documentation system, how the tools and processes are used to
minimize impact to the development of the affected interfaces, how the system design has matured, how the design
review process operates, and how the system implementation is managed through reporting to ensure a truly world class
scientific instrument compliment is created as the final product.
KEYWORDS: Mirrors, Observatories, James Webb Space Telescope, Space telescopes, Telescopes, Image segmentation, Actuators, Space operations, Wavefronts, Stars
JWST will be used to help understand the shape and chemical composition of the universe, and the evolution of galaxies, stars and planets. With a 6.5 meter primary mirror, the Observatory will observe red shifted light from the early history of the universe, and will see objects 400 times fainter than those seen from large ground-based telescopes or the current generation of space-based infrared telescopes. NASA Goddard Space Flight Center (GSFC) manages JWST with contributions from a number of academic, government, and industrial partners. The contract to build the space-based Observatory for JWST was awarded to the Northrop Grumman Space Technology (NGST)/Ball/Kodak/ATK team.
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