Narrow‐band EUV multilayer coating for the MOSES sounding rocket

dc.contributor.authorOwens, Scott M.
dc.contributor.authorGum, Jeffery S.
dc.contributor.authorTarrio, Charles
dc.contributor.authorGrantham, Steven
dc.contributor.authorDvorak, Joseph
dc.contributor.authorKjornrattanawanich, Benjawan
dc.contributor.authorKeski-Kuha, Ritva
dc.contributor.authorThomas, Roger J.
dc.contributor.authorKankelborg, Charles
dc.description.abstractThe Multi­order Solar EUV Spectrograph (MOSES) is a slitless spectrograph designed to study solar He II emission at 303.8 Å (1 Å = 0.1 nm), 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, +1. Another is the addition of a narrow­band multilayer coating on both the grating and the fold flat, which will reject out­of­band lines that normally contaminate the image of a slitless instrument. The primary metrics for the coating were high peak reflectivity and suppression of Fe XV and XVI emission lines at 284 Å and 335 Å, respectively. We chose B4C/Mg2Si for our material combination since it provides excellent peak reflectivity and rejection of out­of­band wavelengths. Measurements of witness flats at NIST indicate the peak reflectivity at 303.8 is 39.0% for a 15 bilayer stack, while suppression ranges from 7.5x to 12.9x at 284 Å and from 3.4x to 15.1x at 335 Å for the individual reflections in the optical path. 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, respectively.en_US
dc.description.sponsorshipThe authors would like to acknowledge support from NASA grant NAG5-10997, which funds the MOSES sounding rocket mission. We would also like to thank Carl Zeiss Laser Optics for supplying the grating and working hard to ensure it met the MOSES specifications.en_US
dc.identifier.citationOwens, Scott M., Jeffery S. Gum, Charles Tarrio, Steven Grantham, Joseph Dvorak, Benjawan Kjornrattanawanich, Ritva Keski-Kuha, Roger J. Thomas, and Charles C. Kankelborg. "Narrow-band EUV multilayer coating for the MOSES sounding rocket", Proceedings of the SPIE 5900, Optics for EUV, X-Ray, and Gamma-Ray Astronomy II, (September 08, 2005), doi:10.1117/12.617520en_US
dc.titleNarrow‐band EUV multilayer coating for the MOSES sounding rocketen_US
mus.citation.conferenceOptics for EUV, X-Ray, and Gamma-Ray Astronomy II; Oberto Citterio, Stephen L. O'Dell; San Diego, California, USA; July 31, 2005
mus.citation.journaltitleProceedings of the SPIE 5900, Optics for EUV, X-Ray, and Gamma-Ray Astronomy IIen_US
mus.identifier.categoryPhysics & Mathematicsen_US
mus.relation.collegeCollege of Letters & Scienceen_US
mus.relation.universityMontana State University - Bozemanen_US


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