NASA Scientific and Technical Aerospace Reports
NASA Scientific and Technical Aerospace Reports
NASA Scientific and Technical Aerospace Reports
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
agreement for the energy flow, but the ratio of the simulated energy <strong>and</strong> momentum flows remains higher than measurements<br />
by a factor of 2-4.<br />
NTIS<br />
Gyroscopes; Momentum Transfer; Plasma Control; Plasmas (Physics); Simulation<br />
20060002489 Lawrence Livermore National Lab., Livermore, CA USA<br />
Status of Optical Coatings for the National Ignition Facility<br />
Stolz, C. J.; Weinzapfel, C.; Rogowski, G. T.; Smith, D.; Mar. 05, 2001; 10 pp.; In English<br />
Report No.(s): DE2005-15013156; UCRL-JC-142950; No Copyright; Avail.: Department of Energy Information Bridge<br />
Optical coatings are a crucial part of the pulse trapping <strong>and</strong> extraction in the NIF multipass amplifiers. Coatings also steer<br />
the 192 beams from four linear arrays to four converging cones entering the target chamber. There are a total of 1600 physical<br />
vapor deposited coatings on NIF consisting of 576 mirrors within the multipass cavity, 192 polarizers that work in t<strong>and</strong>em with<br />
a Pockels cell to create an optical switch, <strong>and</strong> 832 transport mirrors. These optics are of sufficient size so that they are not<br />
aperture-limiting for the 40-cm x 40 cm beams over an incident range of 0 to 56.4 degrees. These coatings must withst<strong>and</strong><br />
laser fluences up to 25 J/cm2 at 1053 nm (la) <strong>and</strong> 3-ns pulse length <strong>and</strong> are the lomega fluence-limiting component on NIF.<br />
The coatings must have a minimal impact the beam wavefront <strong>and</strong> phase to maintain beam focusability, minimize scattered<br />
loss, <strong>and</strong> minimize nonlinear damage mechanisms. This is achieved by specifications ranging from less than 50 MPa coating<br />
stress, less than 1% coating nonuniformity, \h4Angstroms RMS surface roughness, <strong>and</strong> a PSD specification to control the<br />
amplitude of periodic spatial frequencies. Finally, the primary mission of optical coatings is efficient beam steering so<br />
reflection <strong>and</strong> transmission losses are specified as R\g99.5% <strong>and</strong> \g99% for mirrors <strong>and</strong> polarizers, respectively, <strong>and</strong> T\g98%<br />
for polarizers.<br />
NTIS<br />
Antireflection Coatings; Ignition<br />
76<br />
SOLID-STATE PHYSICS<br />
Includes condensed matter physics, crystallography, <strong>and</strong> superconductivity. For related information see also 33 Electronics <strong>and</strong><br />
Electrical Engineering; <strong>and</strong> 36 Lasers <strong>and</strong> Masers.<br />
20060001675 Edinburgh Univ., UK<br />
Full-Span Silicon Compilation of DSP Hardware<br />
Smith, S. G.; Denyer, P. B.; Renshaw, D.; Asada, K.; Coplan, K. P.; Keightley, M.; Mhar, J. I.; IEEE International Conference<br />
on Acoustics, Speech, <strong>and</strong> Signal Processing (ICASSP ‘87); Volume 1; 1987, pp. 13.6.1 - 13.6.4; In English; See also<br />
20060001583; Copyright; Avail.: Other Sources<br />
Most current silicon compilers rely on an underlying hardware function-library, thereby restricting the user to producing<br />
structural assemblies of library components. Although this gives the systems designer the power to implement function<br />
directly in silicon, it precludes the use of arbitrary cell functions that might be more suited to his application than the existing<br />
set. Moreover, should a new process become available, the cell-library must be redesigned <strong>and</strong> laid-out according to new rules,<br />
by a circuit <strong>and</strong> layout expert. An advance in structural silicon compilation, SECOND, is reported, which promises to impart<br />
flexibility <strong>and</strong> portability to cell-libraries. Through the automatic generation of layout from logical descriptions, cell-libraries<br />
may be maintained in process-independent form, <strong>and</strong> incorporate not only new components, but also new processes with ease.<br />
Implementations of user-specified chips may be in custom or semi-custom form only physical assembly procedures differ.<br />
Author<br />
Structural Design; Silicon Films; Compilers<br />
20060002104 Toronto Univ., Toronto, Canada<br />
SlCOMP: A Silicon Complier for Switched-Capacitor Filters<br />
Eaton, G. V.; Nairn, D. G.; Snelgrove, W. M.; Sedra, A. S.; 1987 IEEE International Symposium on Circuits <strong>and</strong> Systems,<br />
Volume 2; 1987, pp. 321-324; In English; See also 20060002103; Copyright; Avail.: Other Sources<br />
A prototype automatic design <strong>and</strong> layout tool for switched-capacitor filter circuits is described. This Computer Aided<br />
Design (CAD) package is capable of producing a complete switched-capacitor (SC) filter layout from attenuation<br />
215
Change language