Stochastic model for photon noise induced by charged particles in multiplier phototubes of the Hubble Space Telescope fine guidance sensors

Details Stochastic model for photon noise induced by charged particles in multiplier phototubes of the Hubble Space Telescope fine guidance sensors Stochastic model for photon noise induced by charged particles in multiplier phototubes of the Hubble Space Telescope fine guidance sensors

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986opten..25..545h&link_type=abstract

Optical Engineering (ISSN 0091-3286), vol. 25, April 1986, p. 545-555. Previously announced in STAR as N84-26398.

Mathematics

Probability

Cerenkov Radiation, Guidance Sensors, Spaceborne Telescopes, Spacecraft Charging, Attitude Control, Energy Dissipation, Photomultiplier Tubes, Photons, Probability Density Functions, Scattering

Scientific paper

The Space Telescope (ST) is subjected to charged particle strikes in its space environment. ST's onboard fine guidance sensors utilize multiplier phototubes (PMT) for attitude determination. These tubes, when subjected to charged particle strikes, generate spurious photons in the form of Cerenkov radiation and fluorescence which give rise to unwanted disturbances in the pointing of the telescope. A stochastic model for the number of these spurious photons which strike the photocathodes of the multiplier phototube which in turn produce the unwanted photon noise are presented. The model is applicable to both galactic cosmic rays and charged particles trapped in the earth's radiation belts. The model which was programmed allows for easy adaption to a wide range of particles and different parameters for the phototube of the multiplier. The probability density functions for photons noise caused by protons, alpha particles, and carbon nuclei were using thousands of simulated strikes. These distributions are used as part of an overall ST dynamics simulation. The sensitivity of the density function to changes in the window parameters was also investigated.

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