SDO-EVE EUV spectrograph optical design and performance

Details SDO-EVE EUV spectrograph optical design and performance SDO-EVE EUV spectrograph optical design and performance

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007spie.6689e..18c&link_type=abstract

Solar Physics and Space Weather Instrumentation II. Edited by Fineschi, Silvano; Viereck, Rodney A. Proceedings of the SPIE, Vol

Physics

4

Scientific paper

The NASA Solar Dynamics Observatory (SDO), scheduled for launch in 2009, incorporates a suite of instruments including the EUV Variability Experiment (EVE). The EVE instrument package contains grating spectrographs that will measure the solar extreme ultraviolet (EUV) irradiance from 0.1 to 105 nm. The Multiple EUV Grating Spectrograph (MEGS) channels use concave reflection gratings to image solar spectra onto CCDs. MEGS will provide 0.1nm spectral resolution between 5-105nm every 10 seconds with an absolute accuracy of better than 25% over the SDO 5- year mission. MEGS-A utilizes a unique grazing-incidence, off-Rowland circle (RC) design to minimize angle of incidence at the detector while providing >= 0.1nm resolution between 5-37 nm. MEGS-B utilizes a double-pass, cross-dispersed double-Rowland circle design while providing >= 0.1nm resolution between 35-105 nm. We present the as-built performance of the MEGS optical design, including spectral resolution, wavelength shift, focus and alignment.

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