Computer Science – Performance
Scientific paper
Feb 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975prnc.rept.....l&link_type=abstract
Final Report Princeton Univ., NJ. Dept. of Astrophysical Sciences.
Computer Science
Performance
Astronomical Photography, Camera Tubes, Focusing, Magnets, Computer Aided Design, Digital Computers, Hubble Space Telescope, Magnetic Shielding, Modulation Transfer Function, Photoelectrons
Scientific paper
A design is developed of a permanent magnet assembly (PMA) useful as the magnetic focusing unit for the 35 and 70 mm (diagonal) format SEC tubes. Detailed PMA designs for both tubes are given, and all data on their magnetic configuration, size, weight, and structure of magnetic shields adequate to screen the camera tube from the earth's magnetic field are presented. A digital computer is used for the PMA design simulations, and the expected operational performance of the PMA is ascertained through the calculation of a series of photoelectron trajectories. A large volume where the magnetic field uniformity is greater than 0.5% appears obtainable, and the point spread function (PSF) and modulation transfer function(MTF) indicate nearly ideal performance. The MTF at 20 cycles per mm exceeds 90%. The weight and volume appear tractable for the large space telescope and ground based application.
Long Daniel C.
Lowrance John L.
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