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EUV irradiance instrument concept

EUV irradiance instrument concept. C. M. Korendyke March 14, 2005. Spectrally Resolved EUV Irradiance Sensor. Mass – 11kg (sensor and harness) Envelope – 130x30x8cm Spectral range: 2-45nm required Spectral resolution: sufficient to separate bright emission lines on the sun (~0.2nm TBC)

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EUV irradiance instrument concept

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  1. EUV irradiance instrumentconcept C. M. Korendyke March 14, 2005

  2. Spectrally Resolved EUV Irradiance Sensor • Mass – 11kg (sensor and harness) • Envelope – 130x30x8cm • Spectral range: 2-45nm required • Spectral resolution: sufficient to separate bright emission lines on the sun (~0.2nm TBC) • Coalignment to sun center: <3’ • Observation cadence: ~10s (TBC)

  3. Instrument design • Optics: transmission grating and grazing incidence grating designs could nominally satisfy requirements. • Both optics have considerable flight and laboratory heritage. SDO EVE MEGS experiment uses both. • Detectors: photodiode array with filters for visible light rejection, channeltron type detectors also under consideration.

  4. Transmission grating instrument • 5000 line/mm grating produced by Lincoln Labs. Flight heritage on SEM. • Bandpass is 1.7nm for the full sun. • Need to restrict FOV to 3’ with mechanical collimator to achieve 0.2nm resolution. • Grating proven to operate to <3nm • Full/sun low spectral resolution channel for temporal coverage • Scanning FOV instrument for high resolution

  5. Bill Behring type spectrograph Example is a 800mm radius of curvature flown on a rocket in 1963 which measured the solar spectrum from 3 – 40nm with 0.01nm resolution. Grazing incidence design

  6. High Resolution Transmission Grating Instrument Concept Mechanical collimator 1D Diode array Zero order EUV radiation Transmission grating Foil filter

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