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Optical Engineering

High-resolution ultraviolet spectrograph for sounding rocket measurements of planetary emission line profiles
Author(s): Walter M. Harris; John T. Clarke; John W. Caldwell; Paul D. Feldman; Brett C. Bush; Daniel M. Cotton; Supriya Chakrabarti
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Paper Abstract

We constructed a high-resolution imaging spectrograph for use as a payload in a sounding rocket experiment. The spectrograph employs a modified Ebert-Fastie design with a LiF objective prism and a replica of an El echelle grating developed for the Space Telescope Imaging Spectrograph. The instrument has a 5-arcmin-long adjustable width entrance aperture with two identical secondary apertures separated from the primary by ±2 arcmin. The secondary apertures are intended for simultaneous measurement of the sky background. The spectrograph has been optimized for measurement of the 221st order of Lyman-α at a resolution of 0.03 to 0.04 Å. The detector system is a two-dimensional photon counting device that employs a microchannel plate intensifier and a wedge and strip anode readout. The spectrograph is used as a focal plane instrument of the Jupiter Telescope, a Cassegrain telescope constructed exclusively for use as a sounding rocket payload. The Jupiter Telescope is self-pointed, employing image motion compensation to achieve 2- to 3-arc sec image quality. The telescope/spectrograph payload was launched from the White Sands Missile Range on May 4, 1991, to observe the H Lyman-α line profile spatially resolved across the disk of Jupiter in the North-South (polar) and East-West (equatorial) directions, and to measure the H Lyman-α emission line profile from interplanetary hydrogen associated with the local insterstellar medium.

Paper Details

Date Published: 1 December 1993
PDF: 12 pages
Opt. Eng. 32(12) doi: 10.1117/12.149165
Published in: Optical Engineering Volume 32, Issue 12
Show Author Affiliations
Walter M. Harris, Univ. of Michigan (United States)
John T. Clarke, Univ. of Michigan (United States)
John W. Caldwell, Univ. of Michigan (United States)
Paul D. Feldman, Johns Hopkins Univ. (United States)
Brett C. Bush, Univ. of California/Berkeley (United States)
Daniel M. Cotton, Boston Univ. (United States)
Supriya Chakrabarti, Boston Univ. (United States)

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