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Narrow-band EUV Multilayer Coating for the MOSES Sounding RocketThe Multi-order Solar EUV Spectrograph (MOSES) is a slitless spectrograph designed to study solar He II emission at 303.8 Angstroms, to be launched on a sounding rocket payload. One difference between MOSES and other slitless spectrographs is that the images are recorded simultaneously at three spectral orders, m = -1,0, +l. Another is the addition of a narrow-band multilayer coating on both the grating and the fold flat, which will reject out-of-band lines that normally contaminate the image of a slitless instrument. The primary metrics f a the mating were high peak reflectivity and suppression of Fe XV and XVI emission lines at 284 Angstroms and 335 Angstroms, respectively. We chose B4C/Mg2Si for our material combination since it provides better values for all three metrics together than the other leading candidates Si/Ir, Si/B4C or Si/SiC. Measurements of witness flats at NIST indicate the peak reflectivity at 303.6 is 38.5% for a 15 bilayer stack, while the suppression at 284 Angstroms, is 4.5x and at 335 Angstroms is 18.3x for each of two reflections in the instrument. We present the results of coating the MOSES flight gratings and fold flat, including the spectral response of the fold flat and grating as measured at NIST's SURF III and Brookhaven's X24C beamline.
Document ID
20050136633
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Owens, Scott M.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Gum, Jeffery S.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Tarrio, Charles
(National Inst. of Standards and Technology Gaithersburg, MD, United States)
Dvorak, Joseph
(Brookhaven National Lab. Upton, NY, United States)
Kjornrattanawanich, Benjawan
(Brookhaven National Lab. Upton, NY, United States)
Keski-Kuha, Ritva
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Thomas, Roger J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kankelborg, Charles C.
(Montana State Univ. Bozeman, MT, United States)
Date Acquired
August 23, 2013
Publication Date
January 1, 2005
Subject Category
Composite Materials
Distribution Limits
Public
Copyright
Other

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