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Liquid Scoping Study for Tritium-Lean, Fast Ignition Inertial Fusion Energy Power Plants
In a thick-liquid protected chamber design, such as HYLIFE-II, a molten-salt is used to attenuate neutrons and protect the chamber structures from radiation damage. The molten-salt absorbs some of the material and energy given off by the target explosion. In the case of a fast ignition inertial fusion system, advanced targets have been proposed that may be Self-sufficient in the tritium breeding (i.e., the amount of tritium bred in target exceeds the amount burned). These ''tritium-lean'' targets contain approximately 0.5% tritium and 99.5% deuterium, but require a large pr of 10-20 g/cm{sup 2}. Although most of the yield is provided by D-T reactions, the majority of fusion reactions are D-D, which produces a net surplus of tritium. This aspect allows for greater freedom when selecting a liquid for the protective blanket (lithium-bearing compounds are not required). This study assesses characteristics of many single, binary, and ternary molten-salts. Using the NIST Properties of Molten Salts Database, approximately 4300 molten-salts were included in the study [1]. As an initial screening, salts were evaluated for their safety and environmental (S&E) characteristics, which included an assessment of waste disposal rating, contact dose, and radioactive afterheat. Salts that passed the S&E criteria were then evaluated …
Date:
August 14, 2001
Creator:
Schmitt, R. C.; Latkowski, J. F.; Durbin, S. G.; Meier, W. R. & Reyes, S.
Object Type:
Report
System:
The UNT Digital Library
Chemistry and Materials Science Directorate 2002 Postdoctoral Symposium
The understanding of the physical mechanisms by which important biological inhibitors control the nucleation, growth, aggregation, and phase transformation of calcium oxalate crystals at fundamental level is of importance not only to the advances in biomineralization but also to the development of stone disease therapy. Of the three phases of calcium oxalate crystalline, calcium oxalate monohydrate (COM) and dehydrate (COD) are found in the majority of stones formed in the urinary system. Only COM, a major inorganic component of kidney stones, produces adverse physiological effects to human, however. Although a great deal of research has been carried out on the modulation of nucleation, growth, aggregation, and phase transformation of calcium oxalates by biological molecules, the basic mechanism has not yet been determined due to inherent limitations of those techniques that have been utilized The invention of atomic force microscopy (AFM) has opened a new avenue for the study of the crystal growth in general. One can now probe the growth kinetics and dynamics, and morphology of crystal surfaces down to molecular levels as a typical AFM has a lateral resolution of nanometers. In this study, in situ AFM was used to monitor the COM surface under controlled growth conditions. The …
Date:
August 14, 2002
Creator:
Wirth, B D
Object Type:
Report
System:
The UNT Digital Library
National Ignition Facility Project Execution Plan
The ''National Ignition Facility (NIF) Justification of Mission Need'', which was approved by the Secretary of Energy in January 1993, defines the mission of the National Inertial Confinement Fusion (ICF) Program and discusses the specific mission of the NIF Project. The NIF experimental capability will allow nuclear-weapons scientists to assess stockpile problems, verify computational tools, test for nuclear-weapons effects, and increase their understanding of weapons physics. The three weapons laboratory directors and the National Nuclear Security Administration (NNSA) Deputy Administrator for Defense Programs have reviewed the role of the NIT; in Stockpile Stewardship in a joint letter. Along with the Accelerated Strategic Computing Initiative numerical simulations and other aboveground experimental facilities, the NIF will provide critical data that will allow the United States to maintain its technical capabilities in nuclear weapons in the absence of underground testing. As a secondary objective, the NIF will advance our understanding of ICF and help to assess its potential as an energy source. Achieving fusion ignition in the NIF will advance both defense and energy objectives. In affirming the Project's Critical Decision 2,* ''Approval of New Start'', the Secretary of Energy verified the mission need and emphasized that the NIF has the potential to …
Date:
August 14, 2000
Creator:
Moses, Edward
Object Type:
Report
System:
The UNT Digital Library
Research and Development for X-Ray Optics and Diagnostics on the Linac Coherent Light Source (LCLS)
The Linac Coherent Light Source (LCLS) is a 1.5 to 15 {angstrom}-wavelength free-electron laser (FEL), currently proposed for the Stanford Linear Accelerator Center (SLAC). The photon output consists of high brightness, transversely coherent pulses with duration <300 fs, together with a broad spontaneous spectrum with total power comparable to the coherent output. The output fluence, and pulse duration, pose special challenges for optical component and diagnostic designs. We first discuss the specific requirements for the initial scientific experiments, and our proposed solutions. We then describe the supporting research and development program that includes: experimental and theoretical material damage studies; high resolution multilayer design, fabrication, and testing; replicated closed-form optics design and manufacturing; BeB manufacturing; and low-z Fresnel lens design, fabrication and testing. Finally some novel concepts for optical components are presented.
Date:
August 14, 2001
Creator:
Wootton, A.; Arthur, J.; Barbee, T.; Bionta, R.; Jankowski, Alan Frederic; London, R. et al.
Object Type:
Article
System:
The UNT Digital Library
Characteristics of Workload on Asci Blue-Pacific at Lawrence Livermore National Laboratory
Symmetric multiprocessor (SMP) clusters have become the prevalent computing platforms for large-scale scientific computation in recent years mainly due to their good scalability. In fact, many parallel machines being used at supercomputing centers and national laboratories are of this type. It is critical and often very difficult on such large-scale parallel computers to efficiently manage a stream of jobs, whose requirement for resources and computing time greatly varies. Understanding the characteristics of workload imposed on a target environment plays a crucial role in managing system resources and developing an efficient resource management scheme. A parallel workload is analyzed typically by studying the traces from actual production parallel machines. The study of the workload traces not only provides the system designers with insight on how to design good processor allocation and job scheduling policies for efficient resource management, but also helps system administrators monitor and fine-tune the resource management strategies and algorithms. Furthermore, the workload traces are a valuable resource for those who conduct performance studies through either simulation or analytical modeling. The workload traces can be directly fed to a trace-driven simulator in a more realistic and specific simulation experiments. Alternatively, one can obtain certain parameters that characterize the workload …
Date:
August 14, 2000
Creator:
Yoo, A. B. & Jette, M. A.
Object Type:
Article
System:
The UNT Digital Library
[Letter from Donna Davis to many Texas Human Rights Foundation members, August 14, 2000]
Letter from Donna Davis to many different Texas Human Rights Foundation members discussing the upcoming foundation board meeting.
Date:
August 14, 2000
Creator:
Davis, Donna
Object Type:
Letter
System:
The Portal to Texas History
[News Clip: Mold school]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
August 14, 2001, 5:00 p.m.
Creator:
NBC 5 (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
Oral History Interview with Homer James "Jim" Avery, August 14, 2008
Interview with Homer James "Jim" Avery, founder of James Avery Craftsman from Kerrville, Texas. Mr. Avery discusses his childhood, education, service in World War II, and starting and developing his jewelry business.
Date:
August 14, 2008
Creator:
Collins, Francelle Robison; Webb, Jeanie Archer; Leonard, Julie Mosty & Avery, Homer James
Object Type:
Video
System:
The Portal to Texas History
Oral History Interview with Homer James "Jim" Avery, August 14, 2008
Interview with Homer James "Jim" Avery, founder of James Avery Craftsman from Kerrville, Texas. Mr. Avery discusses his childhood, education, service in World War II, and starting and developing his jewelry business.
Date:
August 14, 2008
Creator:
Collins, Francelle Robison; Webb, Jeanie Archer; Leonard, Julie Mosty & Avery, Homer James
Object Type:
Sound
System:
The Portal to Texas History
The Llano News (Llano, Tex.), Vol. 114, No. 45, Ed. 1 Wednesday, August 14, 2002
Weekly newspaper from Llano, Texas that includes local, state, and national news along with advertising.
Date:
August 14, 2002
Creator:
Stephenson, Jimmy
Object Type:
Newspaper
System:
The Portal to Texas History
Texas Disease Prevention News, Volume 60, Number 17, August 2000
Newsletter of the Texas Department of Health discussing the news, activities, and events of the organization and other information related to health in Texas.
Date:
August 14, 2000
Creator:
Texas. Department of Health.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 79, No. 261, Ed. 1 Tuesday, August 14, 2001
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
August 14, 2001
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 78, No. 262, Ed. 1 Monday, August 14, 2000
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
August 14, 2000
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
[Letter from Eleanor Brown to Catherine Murphy, August 14, 2005]
Letter from Eleanor Brown to Catherine Murphy requesting reimbursement for expenses she incurred while traveling to WASP events. "Copy" is handwritten across the top and bottom of the page. Included with the letter are two confirmation emails from Expedia.com and a boarding pass for her flight to Washington, D.C.
Date:
August 14, 2005
Creator:
Brown, Eleanor McLernon
Object Type:
Letter
System:
The Portal to Texas History
Skyshine Contribution to Gamma Ray Background Between 0 and 4 MeV
Natural gamma-ray background is composed of four components; which include cosmic rays, cosmic ray produced atmospheric activity, terrestrial sources, and skyshine from terrestrial sources. Skyshine is radiation scattered from the air above a source that can produce a signal in radiation detection instrumentation. Skyshine has been studied for many years but its contribution to the natural background observed in a detector has not been studied. A large NaI(Tl) detector was used to investigate each of the four components of the natural background using a series of 48-hour measurements and appropriate lead shielding configured to discriminate contributions from each component. It was found that while the contribution from skyshine decreases rapidly with energy, it represents a significant portion of the background spectrum below ~500keV. A similar campaign of measurements using a HPGe detector is underway.
Date:
August 14, 2009
Creator:
Mitchell, Allison L.; Borgardt, James D. & Kouzes, Richard T.
Object Type:
Report
System:
The UNT Digital Library
Illustrated Paperboy (Cleveland, Tex.), Vol. 10, No. 21, Ed. 1 Wednesday, August 14, 2002
Weekly newspaper from Cleveland, Texas that includes local, county, and state news along with extensive advertising.
Date:
August 14, 2002
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
[Photograph of Sirena Statue Next to Salado Creek]
Photograph of a statue half-submerged in clear water in the middle of a grassy, green field surrounded by trees. The statue is of a young woman holding her mermaid tail. A small bank of rocks separates the small body of water from a flooded creek, and beyond the creek is another flooded, grassy field. A downed tree limb with leaves still on it rests on the bank to the left of the statue. Handwritten notes and a white rectangular sticker on the back of the photo indicate the sculpture is called Sirena.
Date:
August 14, 2005
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
The Harper News (Harper, Tex.), Vol. 6, No. 20, Ed. 1 Friday, August 14, 2009
Biweekly newspaper from Harper, Texas that includes community news along with advertising.
Date:
August 14, 2009
Creator:
Stevens, Martha
Object Type:
Newspaper
System:
The Portal to Texas History
Archer County News (Archer City, Tex.), No. 33, Ed. 1 Thursday, August 14, 2008
Weekly newspaper from Archer City, Texas that includes local, state, and national news along with advertising.
Date:
August 14, 2008
Creator:
Lewis, Shelley
Object Type:
Newspaper
System:
The Portal to Texas History
Archer County Advocate (Holliday, Tex.), Vol. 6, No. 19, Ed. 1 Thursday, August 14, 2008
Weekly newspaper from Holliday, Texas that includes local, state, and national news along with advertising.
Date:
August 14, 2008
Creator:
Stevens, Charlotte
Object Type:
Newspaper
System:
The Portal to Texas History
Seminole Sentinel (Seminole, Tex.), Vol. 95, No. 87, Ed. 1 Wednesday, August 14, 2002
Semi-weekly newspaper from Seminole, Texas that includes local, state, and national news along with extensive advertising.
Date:
August 14, 2002
Creator:
Fisher, David
Object Type:
Newspaper
System:
The Portal to Texas History
Seminole Sentinel (Seminole, Tex.), Vol. 96, No. 88, Ed. 1 Sunday, August 14, 2005
Semi-weekly newspaper from Seminole, Texas that includes local, state, and national news along with extensive advertising.
Date:
August 14, 2005
Creator:
Wright, Dustin
Object Type:
Newspaper
System:
The Portal to Texas History
Polk County Enterprise (Livingston, Tex.), Vol. 121, No. 65, Ed. 1 Thursday, August 14, 2003
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
August 14, 2003
Creator:
White, Barbara
Object Type:
Newspaper
System:
The Portal to Texas History
Hondo Anvil Herald (Hondo, Tex.), Vol. 117, No. 33, Ed. 1 Thursday, August 14, 2003
Weekly newspaper from Hondo, Texas that includes local, state, and national news along with extensive advertising.
Date:
August 14, 2003
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History