Photomultiplier tube detector performance and stability for the Earth Observing System's SOLSTICE II instrument

Details Photomultiplier tube detector performance and stability for the Earth Observing System's SOLSTICE II instrument Photomultiplier tube detector performance and stability for the Earth Observing System's SOLSTICE II instrument

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spie.4139..402d&link_type=abstract

Proc. SPIE Vol. 4139, p. 402-411, Instrumentation for UV/EUV Astronomy and Solar Missions, Silvano Fineschi; Clarence M. Korendy

Astronomy and Astrophysics

Astronomy

Scientific paper

The goal of the Earth Observing System (EOS) SOLar STellar Irradiance Comparison Experiment II (SOLSTICE II) is to measure the solar ultraviolet irradiance (115 nm - 320 nm) to within 5% of its absolute value with a 0.5% per year relative accuracy over the course of a minimum mission lifetime of five years. Most detectors degrade over time while studying the sun. The SOLSTICE instrument design is such that detector and optical system degradation is tracked by routinely observing a series of stable early-type stars. Any changes in the system may then be removed from the solar irradiance. Detector performance and stability lies at the heart of SOLSTICE experimental success. The SOLSTICE detectors are Hamamatsu R2078 PhotoMultiplier Tubes (PMTs). We have developed an integrated PMT package [PMT, PMT housing, (mu) -metal magnetic shield, high voltage divider, and pulse-amplifier discriminator (PAD)] that will achieve our performance objectives. We report here on both the design of the integrated detector package and the laboratory measurements of the operational lifetime performance characteristics of SOLSTICE detectors. These include pulse height distribution, quantum efficiency, photocathode surface uniformity, and magnetic susceptibility.

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