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The Daily Chickasha Star (Chickasha, Okla.), Vol. 96, No. 162, Ed. 1 Saturday, December 20, 1997
Newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 20, 1997
Creator:
Settle, David
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Depth profiling of polishing-induced contamination on fused silica surfaces
Laser-induced damage on optical surfaces is often associated with absorbing contaminants introduced by the polishing process. This is particularly the case for UV optics. Here secondary ion mass spectroscopy (SIMS) was used to measure depth profiles of finished process contamination on fused silica surfaces. Contaminants detected include the major polishing compound components (Ce or Zr from CeO2 or ZrO2), Al presently largely because of the use of Al2O3 in the final cleaning process (Fe, Cu,Cr) incorporated during the polishing step or earlier grinding steps. Depth profile data typically showed an exponential decay of contaminant concentration to a depth of 100-200 nm. This depth is consistent with a polishing redeposition layers formed during the chemo-mechanical polishing of fused silica. Peak contaminant levels are typically in the 10-100 ppm range, except for Al with exceeds 1000 ppm. A strong correlation has been shown between the presence of a gray haze damage morphology and the use of CeO2 polishing compound. No strong correlation was found however between high levels of Ce, or any other contaminant and the low damage threshold was observed. In fact one of the strongest indications of a correlation is between increased damage thresholds and increased Zr contamination. This suggests …
Date:
December 20, 1997
Creator:
Kozlowski, M.R.; Carr, J.; Hutcheon, I,; Torres, R.; Sheehan, L. Camp, D. & Yan, M.
Object Type:
Article
System:
The UNT Digital Library
Effect of impurities and stress on the damage distributions of rapidly grown KDP crystals
Development of high damage threshold, 50 cm, rapidly grown KF*P frequency triplers for operation of the National Ignition Facility (NIF) in the 14 J/cm2, 351 nm, 3 ns regime requires a thorough understanding of how the crystal growth parameters and technologies affect laser induced damage. Of particular importance is determining the effect of ionic impurities (e.g. Cr3+, Fe3+, Al3+) which may be introduced in widely varying concentrations via starting salts. In addition, organic particulates can contaminate the solution as leachants from growth platforms or via mechanical ablation. Mechanical stresses in the crystals may also play a strong role in the laser-induced damage distribution (LIDD), particularly in the cases of large boules where hydrodynamic forces in the growth tank may be quite high. WE have developed a dedicated, automated damage test system with diagnostic capabilities specifically designed for measured time resolved bulk damage onset and evolution. The data obtained make it possible to construct characteristic damage threshold distributions for each sample. Test results obtained for a variety of KDP samples grown from high purity starting salts and individually doped with Lucite and Teflon, iron, chromium, and aluminium show that the LIDD drops with increasing contamination content. The results also show that …
Date:
December 20, 1997
Creator:
Runkel, M.; Tan, M.; De Yoreo, J. & Zaitseva, N.
Object Type:
Article
System:
The UNT Digital Library
The Gilmer Mirror (Gilmer, Tex.), Vol. 120, No. 102, Ed. 1 Saturday, December 20, 1997
Semiweekly newspaper from Gilmer, Texas that includes local, state, and national news along with advertising.
Date:
December 20, 1997
Creator:
Overton, Mac
Object Type:
Newspaper
System:
The Portal to Texas History
Laser conditioning study of KDP on the optical sciences laser using large area beams
Considerable attention has been paid over the years to the problem of growing high purity KDP and KD*P to meet threshold requirements on succeeding generations of inertial confinement fusion lasers at LLNL. While damage thresholds for these materials have increased over time, the current National Ignition Facility (NIF) maximum fluence requirement (redline) for KD*P frequency triplers of 14.3 J/cm{sup 2} at 351 nm, 3 ns has not been reached without laser (pre)conditioning. It is reasonable to assume that, despite the rapid increase in damage thresholds for rapidly grown crystals, -a program of large scale conditioning of the 192 NIF triplers will be required. Small area ramp (R/1) tests on single sites indicate that KDP damage thresholds can be raised on average up to 1.5X the unconditioned values. Unpublished LLNL 3{omega} raster conditioning studies on KDP, however, have not conclusively shown that off-line conditioning is feasible for KD*P. Consequently, investigating the feasibility of on-line conditioning of NIF triplers at 3{omega} has become a high priority for the KDP damage group at LLNL. To investigate the feasibility of on-line conditioning we performed a series of experiments using the Optical Sciences Laser (OSL) on numerous samples of conventional and rapid growth KDP and …
Date:
December 20, 1997
Creator:
Runkel, M.; DeYoreo, J.; Sell, W. & Milam, D.
Object Type:
Article
System:
The UNT Digital Library
Laser driven radiography
Intense laser (> 1021 W/cm{sup 3}) driven hard x-ray sources offer a new alternative to conventional electron accelerator Bremsstrahlung sources. These laser driven sources offer considerable simplicity in design and potential cost advantage for multiple axis views. High spatial and temporal resolution is achievable as a result of the very small source size (<100 um) and short-duration of the laser pulse. We have begun a series of experiments with the Petawatt laser at LLNL to determine the photon flux achievable with these sources and assess their potential for Stewardship applications. Additionally, we are developing a conceptual design and cost estimate of a multi-pulse, multi-axis (up to five) radiographic facility utilizing the Contained Firing Facility at site 300 and existing laser hardware.
Date:
December 20, 1997
Creator:
Perry, M.D.; Sefcik, J. & Cowan, T.
Object Type:
Report
System:
The UNT Digital Library
[News Clip: Man of year]
Video footage from the KXAS-TV television station in Fort Worth, Texas, covering a news story.
Date:
December 20, 1997, 6:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Shopping]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
December 20, 1997, 10:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Titanic]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
December 20, 1997, 6:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
Pawhuska Journal-Capital (Pawhuska, Okla.), Vol. 87, No. 102, Ed. 1 Saturday, December 20, 1997
Semiweekly newspaper from Pawhuska, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 20, 1997
Creator:
Gann, Sherry
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Photothermal mapping of defects in the study of builk damage in KDP
Interest in producing high-damage-threshold KH{sub 2}PO{sub 4} (KDP) and (D{sub x}H{sub 1-x}){sub 2}PO{sub 4} (DKDP) for frequency conversion and optical switching applications is driven by the requirements of the National Ignition Facility (NIF) at the Lawrence Livermore National Laboratory (LLNL). At present only the best crystals meet the NIF system requirements at the third harmonic (351 nm) and only after a laser conditioning process. Neither the mechanism for damage in bulk KDP nor the mechanism for conditioning is understood. As part of a development effort to increase the damage thresholds of KDP and DKDP, we have been developing a diagnostic tool that will find these locations, we will use other measurement techniques to determine how these locations differ from the surrounding material and why they cause damage. This will allow crystal growers to focus their efforts during the growth process in improving damage thresholds.
Date:
December 20, 1997
Creator:
Woods, B.; Yan, M.; DeYoreo, J.; Kozlowski, M.; Radouski, H. & Wu, Z.
Object Type:
Article
System:
The UNT Digital Library
The Albany News (Albany, Tex.), Vol. 122, No. 25, Ed. 1 Thursday, November 20, 1997
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
November 20, 1997
Creator:
Lucas, Donnie A.
Object Type:
Newspaper
System:
The Portal to Texas History
Altus Times (Altus, Okla.), Vol. 98, No. 209, Ed. 1 Thursday, November 20, 1997
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 20, 1997
Creator:
Cole, Carol
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Analysis of intergranular impurity concentration and the effects on the ductility of copper shaped charge jets
A geometrical analysis based on an assumed tetrakaidecahedron grain shape is applied to determine the relationship among grain size, bulk impurity content, and breakup time in sulfur-doped, high-precision, 81-mm, oxygen-free electronic (ofe) copper shaped charge liners. The calculations determine the number of impurity atoms as a function of grain size, the number of available sites at the intercrystalline defects, and the intercrystalline impurity concentration. Recent experiments have shown that some larger grain size liners with low impurity contents exhibit better ductility than smaller grain size liners with higher impurity concentrations. Within the range of grain sizes and bulk impurity contents in this study, the analysis suggests that the quadruple nodes and triple lines are saturated with impurities. Over this same range of impurities and grain sizes, only partial filling of a monolayer of impurities exists at the grain boundaries. The analysis suggests that breakup time is fundamentally related to grain boundary impurity concentration.
Date:
November 20, 1997
Creator:
Schwartz, A.J.; Lassila, D.H. & Baker, E.L.
Object Type:
Article
System:
The UNT Digital Library
Archer County News (Archer City, Tex.), No. 47, Ed. 1 Thursday, November 20, 1997
Weekly newspaper from Archer City, Texas that includes local, state, and national news along with advertising.
Date:
November 20, 1997
Creator:
Lobpries, F. Mike
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 76, No. 17, Ed. 1 Thursday, November 20, 1997
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
November 20, 1997
Creator:
Dobbs, Gary
Object Type:
Newspaper
System:
The Portal to Texas History
Bicriteria Network Design Problems
The authors study a general class of bicriteria network design problems. A generic problem in this class is as follows: Given an undirected graph and two minimization objectives (under different cost functions), with a budget specified on the first, find a subgraph from a given subgraph class that minimizes the second objective subject to the budget on the first. They consider three different criteria -- the total edge cost, the diameter and the maximum degree of the network. Here, they present the first polynomial-time approximation algorithms for a large class of bicriteria network design problems for the above mentioned criteria. The following general types of results are presented. First, they develop a framework for bicriteria problems and their approximations. Second, when the two criteria are the same they present a black box parametric search technique. This black box takes in as input an (approximation) algorithm for the criterion situation and generates an approximation algorithm for the bicriteria case with only a constant factor loss in the performance guarantee. Third, when the two criteria are the diameter and the total edge costs they use a cluster based approach to devise approximation algorithms. The solutions violate both the criteria by a logarithmic …
Date:
November 20, 1997
Creator:
Marathe, M. V.; Ravi, R.; Sundaram, R.; Ravi, S. S.; Rosenkrantz, D. J. & Hunt, H. B., III
Object Type:
Report
System:
The UNT Digital Library
The Big Lake Wildcat (Big Lake, Tex.), Vol. SEVENTY-SECOND YEAR, No. 47, Ed. 1 Thursday, November 20, 1997
Weekly newspaper from Big Lake, Texas that includes local, state and national news along with advertising.
Date:
November 20, 1997
Creator:
Werst, David
Object Type:
Newspaper
System:
The Portal to Texas History
Bogata News (Bogata, Tex.), Vol. 87, No. 29, Ed. 1 Thursday, November 20, 1997
Weekly newspaper from Bogata, Texas that includes local, state, and national news along with advertising.
Date:
November 20, 1997
Creator:
Nichols, Nanalee & Nichols, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History
The Canadian Record (Canadian, Tex.), Vol. 107, No. 47, Ed. 1 Thursday, November 20, 1997
Weekly newspaper from Canadian, Texas that includes local, state and national news along with extensive advertising.
Date:
November 20, 1997
Creator:
Ezzell, Nancy & Brown, Laurie Ezzell
Object Type:
Newspaper
System:
The Portal to Texas History
Cherokeean/Herald (Rusk, Tex.), Vol. 149, No. 43, Ed. 1 Thursday, November 20, 1997
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
November 20, 1997
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
Chickasha Daily Express (Chickasha, Okla.), Ed. 1 Thursday, November 20, 1997
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 20, 1997
Creator:
Bush, Kent
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Comanche Chief (Comanche, Tex.), Vol. 123, No. 28, Ed. 1 Thursday, November 20, 1997
Weekly newspaper from Comanche, Texas that includes local, state, and national news along with advertising.
Date:
November 20, 1997
Creator:
Wilkerson, James C., III
Object Type:
Newspaper
System:
The Portal to Texas History
The Daily Chickasha Star (Chickasha, Okla.), Vol. 96, No. 142, Ed. 1 Thursday, November 20, 1997
Newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 20, 1997
Creator:
Settle, David
Object Type:
Newspaper
System:
The Gateway to Oklahoma History