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3(omega) Damage: Growth Mitigation
The design of high power UV laser systems is limited to a large extent by the laser-initiated damage performance of transmissive fused silica optical components. The 3{omega} (i.e., the third harmonic of the primary laser frequency) damage growth mitigation LDRD effort focused on understanding and reducing the rapid growth of laser-initiated surface damage on fused silica optics. Laser-initiated damage can be discussed in terms of two key issues: damage initiated at some type of precursor and rapid damage growth of the damage due to subsequent laser pulses. The objective of the LDRD effort has been the elucidation of laser-induced damage processes in order to quantify and potentially reduce the risk of damage to fused silica surfaces. The emphasis of the first two years of this effort was the characterization and reduction of damage initiation. In spite of significant reductions in the density of damage sites on polished surfaces, statistically some amount of damage initiation should always be expected. The early effort therefore emphasized the development of testing techniques that quantified the statistical nature of damage initiation on optical surfaces. This work led to the development of an optics lifetime modeling strategy that has been adopted by the NIF project to …
Date:
February 22, 2001
Creator:
Kozlowski, M; Demos, S; Wu, Z-L; Wong, J; Penetrante, B & Hrubesh, L
Object Type:
Report
System:
The UNT Digital Library
3(omega) Power Balance Procedure on the NIF
This document defines the detailed NIF full system shot procedure to obtain 8% power balance as specified by the SDR002 3.2.1.04. Because the 48 quads of the NIF will be set up over a period of five years, obtaining power balance will naturally be accomplished in two steps. First, as each quad is brought online, the four laser beams within each quad will be tuned by setting the PABTS splitter ratios so that each beam will give the same laser power on target during low energy square pulse shots. During the quad activation period all of the technical tools and procedures will be developed that are needed for attaining full laser power balance. After the initial settings of the 48 PABTS, if no other tuning is done the overall NIF power balance is expected to be about <15%. In the second step, an iteration procedure with approximately 18 full laser system shots will be needed to obtain 8% power balance by tuning out the remaining systematic differences among the quads to an acceptable small difference of 2% rms (at 3{omega}). This rms difference is smaller than the expected variation of the injection energy or the amplifier gain, and is also …
Date:
January 22, 2001
Creator:
Glenzer, S.; Jones, O.; Speck, D. R.; Munro, D.; Lerche, R.; Salmon, T. et al.
Object Type:
Report
System:
The UNT Digital Library
3 Plant Radiation Study Interim Report #5- Part II Data on Gamma Shielding of Special Plutonium Samples
The calculation of shielding the thickness for plutonium is complicated by the many different energies represented in the gamma radiation emitted during decay of the plutonium isotopes. Dose rate predictions are also frequently confused by gamma from varying content of fission product impurities in the plutonium, as well as other gamma radiation induced through alpha and neutron particle absorption within the source material or its environment. After assumptions are made for these many factors the radiation data for shielding determination is still frequently inadequate because of wide variations in dose rates resulting from self-absorption. The degree if self-shielding is in turn dependent on nature of the plutonium compound, degree of compactness, weight, and over-all geometrical distribution of the source material. By preparing a variety of plutonium samples representing combinations of these varying factors, actual dose rates and gamma spectra, as obtained from them, can then be extrapolated for application to specific situations.
Date:
October 22, 1959
Creator:
Moulthrop, H. A.
Object Type:
Report
System:
The UNT Digital Library
The 7 by 10 Foot Wind Tunnel of the National Advisory Committee for Aeronautics
This report presents a description of the 7 by 10 foot wind tunnel and associated apparatus of the National Advisory Committee for Aeronautics. Included also are calibration test results and characteristic test data of both static force tests and autorotation tests made in the tunnel.
Date:
October 22, 1931
Creator:
Harris, Thomas A.
Object Type:
Report
System:
The UNT Digital Library
The 9/11 Commission and a National Counterterrorism Center: Issues and Options for Congress
This report examines a number of issues as Congress considers codification of an NCTC. One issue is whether the centralization remedy the commission has recommended fits the problems associated specifically with the 9/11 intelligence failure, and perhaps more broadly, the systematic maladies affecting the Intelligence Community. There are at least four options for congressional consideration: (1) NCTC with intelligence and operational planning duties, (2) NCTC restricted to an intelligence role, (3) NCTC restricted to an operational planning role, and (4) status quo plus-viewing the newly forming collected entity as a pilot potential NCTC. As one of its 41 recommendations, the 9/11 Commission recommended the creation of a National Counterterroism Center (NCTC).
Date:
October 22, 2004
Creator:
Masse, Todd
Object Type:
Report
System:
The UNT Digital Library
9-11 Commission Final Report Press Conference
Recording of a press conference held by the National Commission on Terrorist Attacks upon the United States to announce the release of the final report and discuss the findings of the commission.
Date:
July 22, 2004
Creator:
National Commission on Terrorist Attacks upon the United States
Object Type:
Video
System:
The UNT Digital Library
9-11 Commission Hearing #2, May 22, 2003, Part 1
Recording of the second public hearing held by the National Commission on Terrorist Attacks Upon the United States on May 22, 2003 at the Hart Senate Office Building in Washington, D.C. This hearing addresses four topics, which include the commission mandate and objectives, intelligence oversight and the joint inquiry, affected constituencies, and the state of civil aviation security on September 11th. This section includes the first panel on the commission mandate and objectives, with testimony from Congresswoman Nancy Pelosi, Senator John McCain, and Senator Joseph Lieberman.
Date:
May 22, 2003
Creator:
National Commission on Terrorist Attacks upon the United States
Object Type:
Video
System:
The UNT Digital Library
9-11 Commission Hearing #2, May 22, 2003, Part 2
Recording of the second public hearing held by the National Commission on Terrorist Attacks upon the United States on May 22, 2003 at the Hart Office Senate Building in Washington, D.C. This hearing addresses four topics, which include the commission mandate and objectives, intelligence oversight and the joint inquiry, affected constituencies, and the state of civil aviation security on September 11th. This section includes the second panel on intelligence oversight and the joint inquiry with testimony from Senators Bob Graham and Richard Shelby and Representatives Porter Goss and Jane Harman.
Date:
May 22, 2003
Creator:
National Commission on Terrorist Attacks upon the United States
Object Type:
Video
System:
The UNT Digital Library
9-11 Commission Hearing #2, May 22, 2003, Part 3
Recording of the second public hearing held by the National Commission on Terrorist Attacks upon the United States on May 22, 2003 at the Hart Senate Office Building in Washington, D.C. This hearing addresses four topics, which include the commission mandate and objectives, intelligence oversight and the joint inquiry, affected constituencies, and the state of civil aviation security on September 11th. This section contains the third panel on affected constituencies with testimony from Senators Schumer, Clinton, Corzine and Lautenberg, and Representatives Nadler, Shays, and Smith.
Date:
May 22, 2003
Creator:
National Commission on Terrorist Attacks upon the United States
Object Type:
Video
System:
The UNT Digital Library
9-11 Commission Hearing #2, May 22, 2003, Part # 4
Recording of the second public hearing held by the National Commission on Terrorist Attacks upon the United States on May 22, 2003 at the Hart Senate Office Building in Washington, D.C. This hearing addresses four topics, which include the commission mandate and objectives, intelligence oversight and the joint inquiry, affected constituencies, and the state of civil aviation security on September 11th. This section includes the panel on civil aviation security with testimony from representatives of the Federal Aviation Administration, the Department of Transportation, the Air Transport Association of America, and the Transportation Security Agency.
Date:
May 22, 2003
Creator:
National Commission on Terrorist Attacks upon the United States
Object Type:
Video
System:
The UNT Digital Library
9/11 Commission Recommendations: A Civil Liberties Oversight Board
This report discusses the recommendation made by the National Commission on Terrorist Attacks Upon the United States (9/11 Commission) regarding the creation of a board within the executive branch to oversee adherence to guidelines on, and the commitment to defend, civil liberties by the federal government.
Date:
December 22, 2004
Creator:
Relyea, Harold C.
Object Type:
Report
System:
The UNT Digital Library
9/11 Commission Recommendations: A Civil Liberties Oversight Board
From Summary: This report discusses recommendations made by the National Commission on Terrorist Attacks Upon the United States (9/11 Commission) which include: "creation of a board within the executive branch to oversee adherence to guidelines on, and commitment to defend, civil liberties by the federal government."
Date:
December 22, 2004
Creator:
Relyea, Harold C.
Object Type:
Report
System:
The UNT Digital Library
9/11 Commission Recommendations: The Senate Confirmation Process for Presidential Nominees
On July 22, 2004, the National Commission on Terrorist Attacks Upon the United States, known as the 9/11 Commission, issued its final report, detailing the events up to and including the September 11, 2001 terrorist attacks upon the United States. The 9/11 Commission recommended that the Senate adopt rules requiring hearings and votes to confirm or reject national security nominees within 30 days of their submission at the start of each new presidential administration. Implementing the commission's proposal would involve imposing new restrictions on both the power of committee chairs to control the agenda of their committees and the rights of Senators to delay or block nominations through holds and extended debate. This report discusses in detail this proposal, how it could be implemented, and the potential effects of its implementation.
Date:
November 22, 2004
Creator:
Palmer, Betsy
Object Type:
Report
System:
The UNT Digital Library
The 9/11 Commission Report: Final Report of the National Commission on Terrorist Attacks Upon the United States
The official Government edition of the Final Report of the National Commission on Terrorist Attacks Upon the United States (also known as the 9-11 Commission, an independent, bipartisan commission created by congressional legislation and the signature of President George W. Bush in late 2002), provides a full and complete account of the circumstances surrounding the September 11, 2001 terrorist attacks, including preparedness for and the immediate response to the attacks. Provides recommendations designed to guard against future attacks.
Date:
July 22, 2004
Creator:
National Commission on Terrorist Attacks upon the United States
Object Type:
Book
System:
The UNT Digital Library
12.6 keV Kr K-alpha X-ray Source For High Energy Density Physics Experiments
A high contrast 12.6 keV Kr K{alpha} source has been demonstrated on the petawatt-class Titan laser facility. The contrast ratio (K{alpha} to continuum) is 65, with a competitive ultra short pulse laser to x-ray conversion efficiency of 10{sup -5}. Filtered shadowgraphy indicates that the Kr K{alpha} and K{beta} x-rays are emitted from a roughly 1 x 2 mm emission volume, making this source suitable for area backlighting and scattering. Spectral calculations indicate a typical bulk electron temperature of 50-70 eV (i.e. mean ionization state 13-16), based on the observed ratio of K{alpha} to K{beta}. Kr gas jets provide a debris-free high energy K{alpha} source for time-resolved diagnosis of dense matter.
Date:
April 22, 2008
Creator:
Kugland, N.; Constantin, C. G.; Niemann, C.; Neumayer, P.; Chung, H.; Doppner, T. et al.
Object Type:
Article
System:
The UNT Digital Library
16 Individual Letters from citizens urging the Commission to reconsider the recommendatio to re-align work from NSWC Crane
Community Correspondence - 16 Individual Letters from citizens urging the Commission to reconsider the recommendatio to re-align work from NSWC Crane
Date:
August 22, 2005
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
20-100 keV K(alpha) X-Ray Source Generation by Short Pulse High Intensity Lasers
We are studying the feasibility of utilizing K{alpha} x-ray sources in the range of 20 to 100 keV as a backlighters for imaging various stages of implosions and high areal density planar samples driven by the NIF laser facility. The hard x-ray K{alpha} sources are created by relativistic electron plasma interactions in the target material after a radiation by short pulse high intensity lasers. In order to understand K{alpha} source characteristics such as production efficiency and brightness as a function of laser parameters, we have performed experiments using the 10 J, 100 fs JanUSP laser. We utilized single-photon counting spectroscopy and x-ray imaging diagnostics to characterize the K{alpha} source. We find that the K{alpha} conversion efficiency from the laser energy is {approx} 3 x 10{sup -4}.
Date:
August 22, 2003
Creator:
Park, H. S.; Koch, J. A.; Landen, O. L.; Phillips, T. W. & Goldsack, T.
Object Type:
Article
System:
The UNT Digital Library
S-20 photocathode research activity. Part I
The goal of this activity has been to develop and implement S-20 photocathode processing techniques at Lawrence Livermore National Laboratory (LLNL) in order to study the physical properties of the photocathode films. The present work is the initial phase of a planned activity in understanding cathode fabrication techniques and the optical/electrical characterization of these films.
Date:
November 22, 1983
Creator:
Gex, F.; Huen, T. & Kalibjian, R.
Object Type:
Report
System:
The UNT Digital Library
30 individual letters related to Cannon Air Force Base
Community Correspondence - 30 individual letters related to Cannon Air Force Base
Date:
August 22, 2005
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
45-Day safety screen results and final report for Tank 241-SX-113, Auger samples 94-AUG-028 and 95-AUG-029
This document serves as the 45-day report deliverable for tank 241-SX-113 auger samples collected on May 9 and 10, 1995. The samples were extruded, and analyzed by the 222-S Laboratory. Laboratory procedures completed include: differential scanning calorimetry; thermogravimetric analysis; and total alpha analysis. This report incudes the primary safety screening results obtained from the analyses. As the final report, the following are also included: chains of custody; the extrusion logbook; sample preparation data; and total alpha analysis raw data.
Date:
June 22, 1995
Creator:
Sasaki, L.M.
Object Type:
Report
System:
The UNT Digital Library
62-TeV center of mass hadron collider with capability for super bunch beams
A 60 TeV center of mass hadron collider is proposed, which has capability of using Superbunch beam. With Superbunch beam, the luminosity is expected to be increased by a factor of 20, compared with conventional acceleration using RF cavities. This hadron collider will be built in two stages with a low field magnet ring first and a high field magnet ring later in the same tunnel. The low field magnet rig will be built with Pipetron scheme, with 7 TeV and 7 TeV proton beams, making a 14 TeV center of mass energy high luminosity collider, using Superbunch beams. In the second stage 10 Tesla high field magnets with twin beams, will be installed. It also utilizes Superbunch beams, realizing high luminosity collider. To accelerate Superbunch beams, the barrier bucket and acceleration induction cells will be used, which are made of induction cells, utilizing FINEMET material. The core loss of the FINEMET is estimated for the whole collider is estimated. The synchrotron radiation of the collider is also estimated. Merits of Superbunch beams over RF bunched beams for the high energy experiments is described.
Date:
August 22, 2001
Creator:
Takayama, Ryuji Yamada and Ken
Object Type:
Article
System:
The UNT Digital Library
100 Area D4 Project Semi-Annual 2006 Building Completion Report, August 2005 - April 2006
This report documents the decontamination, decommissioining (D&D) and the demolition of select facilities in the 100 Area of the Hanford Site as required by DOE G 430.1-4.
Date:
June 22, 2006
Creator:
Griff, B. C.
Object Type:
Report
System:
The UNT Digital Library
100 area weekly report - June 22, 1955
None
Date:
June 22, 1955
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
100 Areas technical activities report: Engineering, August 1947
There were seven charges of metal inspected during the month for corrosion and blistering studies. There were no unusual cases of blistering noted and the corrosion rates were normal for this time of year. Borescopic examination of the graphite packing around the ``B`` Hole in the F Pile revealed that the graphite is no more severely cracked than in the D Pile when it was inspected about a year ago. Examination of the graphite at the downstream and of Tube 1385-D did not indicate that any damage had been done by the leak in that tube. Forty one tubes have been charged in the F Pile on Production Test 105-90-P, ``Exposure of TX Metal Slugs.`` The routine job of taking vertical bowing measurements was turned over to the Instrument Department after working with them once in each Area. Installation of Van Stone test units was completed and a brief run was started. Van Stone flanges at both ends of 64 process tubes in both the B and F Piles were measured with a micrometer to determine the minimum amount of metal remaining.
Date:
September 22, 1947
Creator:
Woods, W. K.
Object Type:
Report
System:
The UNT Digital Library