Narrow-band EUV multilayer coating for the MOSES sounding rocket

Scott M. Owens; Jeffery S. Gum; Charles Tarrio; Steven Grantham; Joseph Dvorak; Benjawan Kjornrattanawanich; Ritva Keski-Kuha; Roger J. Thomas; Charles C. Kankelborg

doi:10.1117/12.617520

8 September 2005 Narrow-band EUV multilayer coating for the MOSES sounding rocket

Scott M. Owens, Jeffery S. Gum, Charles Tarrio, Steven Grantham, Joseph Dvorak, Benjawan Kjornrattanawanich, Ritva Keski-Kuha, Roger J. Thomas, Charles C. Kankelborg

Author Affiliations +

Proceedings Volume 5900, Optics for EUV, X-Ray, and Gamma-Ray Astronomy II; 590003 (2005) https://doi.org/10.1117/12.617520
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

The Multi-order 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 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 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 out-of-band 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.

Citation Download Citation

Scott M. Owens, 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", Proc. SPIE 5900, Optics for EUV, X-Ray, and Gamma-Ray Astronomy II, 590003 (8 September 2005); https://doi.org/10.1117/12.617520

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available