Scientific and Technical Aerospace Reports Volume 38 July 28, 2000

action and interference of the light among the primary particles. Calculations are made for aggregates similar to those generated
experimentally that demonstrate the rich structure in the scattering pattern. A comparison of the experimental and theoretical
TAOS gives good qualitative agreement.
DTIC
Light Scattering; Optical Properties; Physical Optics
20000066601 NASA Marshall Space Flight Center, Huntsville, AL USA
Multi-Use Space Optics Test Facility
Reily, Jack C., NASA Marshall Space Flight Center, USA; Kegley, Jeff, NASA Marshall Space Flight Center, USA; Keidel, John,
NASA Marshall Space Flight Center, USA; Siler, Richard, NASA Marshall Space Flight Center, USA; Wright, Ernie, NASA Marshall
Space Flight Center, USA; Jacobson, David, NASA Marshall Space Flight Center, USA; Smith, Scott, NASA Marshall
Space Flight Center, USA; Eng, Ron, NASA Marshall Space Flight Center, USA; Stahl, Phil, NASA Marshall Space Flight Center,
USA; [2000]; 2p; In English; Optical, 18-23 Jun. 2000, Quebec, Canada; Sponsored by Optical Society of America, USA; No
Copyright; Avail: Issuing Activity; Abstract Only
Marshall Space Flight Center has modified the X-ray Calibration Facility to test Next Generation Space Telescope developmental
mirrors at cryogenic temperatures (35 degrees Kelvin) while maintaining capability for performance testing of x-ray optics
and detectors. Marshall Space Flight Center (MSFC) has maintained and operated a world-class x-ray optics and detector testing
facility since mid 1970. The ground test and calibration of the Chandra (previously AXAF) X-ray Observatory required extensive
modifications to the X-ray Calibration Facility (XRCF). X-ray optical performance testing of the Chandra optics and detectors
was successfully completed at the XRCF in 1997. The development phase for the Next Generation Space Telescope (NGST) program
and the establishment of the Space Optics Manufacturing Technology Center at MSFC led to additional modifications to
the XRCF to accommodate optical testing at cryogenic temperatures. NGST supported efforts include the Sub-Scale Beryllium
Mirror Demonstrator (SBMD) and the NGST Mirror System Demonstrator (NMSD) programs. In addition, the Advanced Mirror
System Demonstrator (AMSD) program will use the cryogenic test facility for mirror performance testing in 2001. In 1999 the
facility was upgraded to perform cryogenic testing of lightweight visible optics, without compromising the existing x-ray testing
capability. A thermal enclosure capable of 20 degrees Kelvin and a vibration isolated instrumentation mount were added. A vacuum-compatible
five-axis motion table was modified to operate under cryogenic conditions in order to provide mirror steering
under test conditions. This new cryogenic test facility will accommodate optics up to two meters in diameter, with radii of curvature
of up to twenty meters. Several facility characterization tests and three NGST program mirror tests have been conducted at
cryogenic temperatures to date. Data from these cryogenic tests will allow the development teams to perform final polishing operations
on the mirrors, based on optical figure data collected at a temperature of 35 degrees Kelvin. Optical wavefront measurements
were made at 35 degrees Kelvin with several instruments located at the radius of curvature of the mirror. The current wavefront
measuring instruments include a Shack-Hartman wavefront sensor as the main instrument, a Point Diffraction Interferometer
(PDI), a Point Spread Function (PSF) imager, and a radius of curvature measuring instrument. Planned enhancements to this system
include the addition of a vibration insensitive phase shifting interferometer.
Author
Performance Tests; Test Facilities; X Ray Optics; Space Manufacturing; Calibrating; Next Generation Space Telescope Project;
Optical Equipment
20000067645 NASA Marshall Space Flight Center, Huntsville, AL USA
Characterization of X-Ray Diffraction System with a Microfocus X-Ray Source and a Polycapillary Optic
Gubarev, Mikhail, NASA Marshall Space Flight Center, USA; Marshall, Joy K., NASA Marshall Space Flight Center, USA; Ciszak,
Ewa, NASA Marshall Space Flight Center, USA; Ponomarev, Igor, NASA Marshall Space Flight Center, USA; [2000]; 1p;
In English; 49th; 49th Annual Denver X-Ray Conference, 31 Jul. - 4 Aug. 2000, Denver, CO, USA; No Copyright; Avail: Issuing
Activity; Abstract Only
We present here an optimized microfocus x-ray source and polycapillary optic system designed for diffraction of small protein
crystals. The x-ray beam is formed by a 5.5mm focal length capillary collimator coupled with a 40 micron x-ray source operating
at 46Watts. Measurements of the x-ray flux, the divergence and the spectral characteristics of the beam are presented, This optimized
system provides a seven fold greater flux than our recently reported configuration [M. Gubarev, et al., J. of Applied Crystallography
(2000) 33, in press]. We now make a comparison with a 5kWatts rotating anode generator (Rigaku) coupled with
confocal multilayer focusing mirrors (Osmic, CMF12- 38Cu6). The microfocus x-ray source and polycapillary collimator system
200