Browsing by Author "Powell, Forbes R."

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Calibration of multilayer mirrors for the Multi‐Spectral Solar Telescope Array II
(1995-06-20) Kankelborg, Charles; Plummer, James E.; Martinez-Galarce, Dennis S.; O'Neal, Ray H.; DeForest, Craig; Walker, Arthur B.C. II; Barbee, Troy W. Jr.; Weed, J.W.; Hoover, Richard B.; Powell, Forbes R.
The Multi-Spectral Solar Telescope Array II (MSSTA II), a rocket-borne solar observatory, was successfully flown on November 3, 1994 obtaining solar images in multiple XUV and FUV bands with an array of compact multilayer telescopes. Extensive measurements have recently been carried out on some of the multilayer telescopes at the Stanford Synchrotron Radiation Laboratory. These measurements are the first high spectral resolution calibrations of newly introduced MSSTA II instruments and instruments with lambda0 less than 130 angstrom. Previous measurements and/or calculations of telescope throughputs have been confirmed with greater accuracy. Results are presented on Mo/Si multilayer bandpasses, and multilayer bandpass changes with time.
Design and performance of thin foil XUV filters for the Multi‐Spectral Solar Telescope Array II
(1995-06-20) Plummer, James E.; DeForest, Craig; Martinez-Galarce, Dennis S.; Kankelborg, Charles; Gore, David B.; O'Neal, Ray H.; Walker, Arthur B.C. II; Powell, Forbes R.; Hoover, Richard B.; Barbee, Troy W. Jr.; Weed, J.W.
The redesigned payload of the Multi-Spectral Solar Telescope Array (MSSTA), the MSSTA II, was successfully flown on November 3, 1994. The multilayer mirrors used in the normal incidence optical systems of the MSSTA II are efficient reflectors for soft x-ray/extreme ultraviolet (EUV) radiation at wavelengths that satisfy the Bragg condition, thus allowing a narrow band of the soft x-ray/EUV spectrum to be isolated. When applied to solar observations the temperature response of an optical system is quite sensitive to telescope bandpass because of the high density of lines in the coronal spectrum. We have designed a set of thin foil filters in conjunction with our multilayer optics to eliminate contaminant lines and specular reflectivity, thus enhancing the temperature diagnostic capabilities of our instruments. Extensive measurements have recently been carried out on the thin foil filters at the Stanford Synchrotron Radiation Laboratory. We describe here the design and performance of thin foil filters developed for the MSSTA II.