Capability Development for Extreme Ultraviolet Imaging and Calibration,
Michael W. Davis
G. Randall Gladstone
Thomas G. Greathouse
Kurt D. Retherford
Gregory S. Winters
Bill R. Sandel
Inclusive Dates: 07/01/12 – Current
Background — SwRI has a nearly 20-year history of designing, integrating, testing, and launching ultraviolet spectrographs. Beginning with the EUVS rocket in 1993 and continuing through four iterations of the Alice line of spectrographs, SwRI's UV spectrographs have successfully returned data from comets, asteroids, the Moon, planets and even stars. However, virtually all of these observations were made in the far ultraviolet (FUV) range, longer than 100 nm. The next step is to expand SwRI's capabilities to even shorter UV wavelengths.
Approach — The objective of this project is to develop the capability to build and calibrate instrumentation that operates solely in EUV wavelengths. SwRI plans to design an improved version of the IMAGE-EUV imager that upon selection by NASA will be built and calibrated at SwRI. Along with a notional design, SwRI plans to reduce some of the technical risks in building and testing an EUV imager, in preparation for the next appropriate NASA mission opportunity. Finally, SwRI will perform a calibration of an existing detector system at EUV wavelengths, going through all of the steps that would be performed in a real flight EUV instrument calibration. By the conclusion of this project, SwRI will be positioned to be the leader in EUV instrument design and calibration.
Accomplishments — SwRI has a baseline imager design that increases the field of view 43 percent while increasing collecting area by 20 percent over the previously built imager. SwRI researchers have found a multilayer mirror coating that doubles reflectivity over the previously built imager, along with a vendor experienced with said coating. Filters were procured to proceed with laboratory testing.