Performance modeling of JWST near-infrared multi-object spectrograph

Frédéric Zamkotsian; Kjetil Dohlen

doi:10.1117/12.551579

12 October 2004 Performance modeling of JWST near-infrared multi-object spectrograph

Proceedings Volume 5487, Optical, Infrared, and Millimeter Space Telescopes; (2004) https://doi.org/10.1117/12.551579
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

Abstract

The James Webb Space Telescope (JWST) will be equipped with a Near Infrared Multi-Object Spectrograph (NIRSpec), in order to record simultaneously several hundred spectra in a single observation run. The selection of the objects in the field of view will be done by a micro-elecro-mechanical system (MEMS): a micro-shutter array. This array is easily reconfigurable and can generate any slit mask geometry. At the Laboratoire d’Astrophysique de Marseille, we have developed since several years different tools for the modeling and the characterization of these MOEMS slit masks. Our model, based on Fourier theory, addresses two key parameters for the MOS performance: contrast and spectral photometric variation (SPV). The integration in a single model of the JWST telescope, the micro-shutter slit mask, the spectrograph and the detector is proposed. The JWST telescope simulator assess pupil shape with low, mid and high frequencies aberrations on the whole telescope as well as on each segment. Additional wavefront aberrations generated by the fore-optics and the spectrograph are also taken into account. NIRSpec performance is then calculated as function of multiple parameters such as telescope pupil shear, object position in the field, plate scale, object location within the slit, pupil oversizing, wavelength, and dithering strategy. Evaluation of the encircled energy is also presented, including the spectrograph aberrations.

Citation Download Citation

Frédéric Zamkotsian and Kjetil Dohlen "Performance modeling of JWST near-infrared multi-object spectrograph", Proc. SPIE 5487, Optical, Infrared, and Millimeter Space Telescopes, (12 October 2004); https://doi.org/10.1117/12.551579

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available