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[ pdf ] Prime Focus Imaging Spectrograph Mechanical Design Overview

Prime Focus Imaging Spectrograph Mechanical Design Overview Download
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Topic under  Mechanical
Source: www.sal.wisc.edu 
File size: 218 KB
File type: pdf
Last download on: Thu Jul 27, 2017 11:44:54 AM
Short Desciption:
This document describes the mechanical design rationale and summarizes the results of the Preliminary Design for the SALT PFIS instrument.

Summary:
2.2 Design Goals and Methodology The following goals guide the PFIS mechanical design The structure will be able to carry a NIR beam with mass properties equivalent to the visible beam Image motion at the detector due to flexure and thermal effects is to be less than 0.1 arcsec/ hour parallel to the dispersion, and less than 0.15 arcsec/ hour perpendicular to the dispersion during an observation. 0.1 arcsec corresponds to 12 microns, or one-third the camera resolution in the dispersion direction. Regular access is to be limited to no more than once/ week. Configuration of the instrument is to require no more than 5 minutes.
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