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Charged Particle Spectroscopy on Omega (Final report)
Using the 2-MeV Van de Graaf Accelerator at SUNY Geneseo's Nuclear Structure Laboratory, a {sup 3}He-implanted tantalum target was bombarded by 450-keV deuterons to produce high energy protons via the {sup 3}He(d,p){sup 4}He reaction. A 1500-{micro}m surface barrier detector with a 3/16 inch diameter collimator was placed at 8.75 cm from the target and 135{sup o} from the incident beam. A movable arm was setup so that an array of aluminum filters of varying thicknesses could be rotated in front of the detector. A 6-{micro}m mylar filter was also mounted on the movable arm and was used to calibrate the detector as described in the CR-39 experiment report. Eight aluminum filters with thicknesses ranging from 250pm to 1100{micro}m were in turn rotated in front of the collimator and spectra were taken for each. The results are shown on the attached graphs. The theoretical curve for each graph was generated using TRIM The exact energy distribution of the proton beam incident on the target was not known; because no such spectrum could be taken due to the high count rate for elastically scattered deuterons. Instead, it was assumed that the incident beam had a distribution similar to that measured through the …
Date:
January 1, 2001
Creator:
Fletcher, K.; Padalino, S.; Schwartz, B.; Olsen, M.; Wakeman, T. & Petrasso, R.
Object Type:
Report
System:
The UNT Digital Library
The Role of Ledge Nucleation/Migration in ''Omega'' Plate Thickening Behavior in Al-Cu-Mg-Ag Alloys
The thickening kinetics of {Omega} plates in an Al-4Cu-0.3Mg-0.2Ag (wt. %) alloy have been measured at 200 C, 250 C and 300 C using conventional transmission electron microscopy techniques. At all temperatures examined the thickening showed a linear dependence on time. At 200 C the plates remained less than 6nm in thickness after 1000h exposure. At temperatures above 200 C the thickening kinetics are greatly increased. Atomic resolution Z-contrast microscopy has been used to examine the structure and chemistry of the (001){sub {Omega}} {parallel} (111){sub {alpha}} interphase boundary in samples treated at each temperature. In all cases, two atomic layers of Ag and Mg segregation were found at the broad face of the plate. The risers of the growth ledges and the ends of the plates were free of segregation. No significant levels of Ag or Mg were detected inside the plate at any time. The necessary redistribution of Ag and Mg accompanying a migrating thickening ledge occurs at all temperatures and is not considered to play a decisive role in the excellent coarsening resistance exhibited by the {Omega} plates at temperatures up to 200 C. Plates transformed at 200 C rarely contained ledges and usually exhibited a strong vacancy …
Date:
March 16, 2001
Creator:
Hutchinson, C.R.
Object Type:
Article
System:
The UNT Digital Library
Development of Lower Energy Neutron Spectroscopy for Areal Density Measurement in Implosion Experiment at NIF and Omega
Areal density ({rho}R) is a fundamental parameter that characterizes the performance of an ICF implosion. For high areal densities ({rho}R> 0.1 g/cm{sup 2}), which will be realized in implosion experiments at NIF and LMJ, the target areal density exceeds the stopping range of charged particles and measurements with charged particle spectroscopy will be difficult. In this region, an areal density measurement method using down shifted neutron counting is a promising alternative. The probability of neutron scattering in the imploded plasma is proportional to the areal density of the plasma. The spectrum of neutrons scattered by the specific target nucleus has a characteristic low energy cut off. This enables separate, simultaneous measurements of fuel and pusher {rho}Rs. To apply this concept in implosion experiments, the detector should have extremely large dynamic range. Sufficient signal output for low energy neutrons is also required. A lithium-glass scintillation-fiber plate (LG-SCIFI) is a promising candidate for this application. In this paper we propose a novel technique based on downshifted neutron measurements with a lithium-glass scintillation-fiber plate. The details of instrumentation and background estimation with Monte Carlo calculation are reported.
Date:
August 2, 2001
Creator:
Isumi, N; Lerche, R A; Phillips, T W; Schmid, G J; Moran, M J & Sangster, T C
Object Type:
Article
System:
The UNT Digital Library
The Hexagon, Volume 92, Number 2, Summer 2001
Quarterly publication of the Alpha Chi Sigma chemistry fraternity containing articles related to chemistry research and the activities of the organization, including local chapters and groups.
Date:
Summer 2001
Creator:
Alpha Chi Sigma
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
The Hexagon, Volume 92, Number 4, Winter 2001
Quarterly publication of the Alpha Chi Sigma chemistry fraternity containing articles related to chemistry research and the activities of the organization, including local chapters and groups.
Date:
Winter 2001
Creator:
Alpha Chi Sigma
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
The Hexagon, Volume 92, Number 3, Fall 2001
Quarterly publication of the Alpha Chi Sigma chemistry fraternity containing articles related to chemistry research and the activities of the organization, including local chapters and groups.
Date:
Autumn 2001
Creator:
Alpha Chi Sigma
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
The Hexagon, Volume 92, Number 1, Spring 2001
Quarterly publication of the Alpha Chi Sigma chemistry fraternity containing articles related to chemistry research and the activities of the organization, including local chapters and groups.
Date:
Spring 2001
Creator:
Alpha Chi Sigma
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
[Memorial Program for Juanita A. Van Dorn, February 9, 2001]
Memorial service program for Soror Juanita A. Van Dorn, born September 19, 1919 and died February 3, 2001. The funeral was held February 9, 2001 at Sutton and Sutton Mortuary, Inc. Memorial service arrangements were made by the Alpha Tau Omega Chapter of Alpha Kappa Alpha Sorority, Inc. Includes one newspaper clipping.
Date:
February 9, 2001
Creator:
unknown
Object Type:
Pamphlet
System:
The Portal to Texas History
Quadratic Reciprocity and the Group Orders of Particle States
The construction of inverse states in a finite field F{sub P{sub P{alpha}}} enables the organization of the mass scale by associating particle states with residue class designations. With the assumption of perfect flatness ({Omega}total = 1.0), this approach leads to the derivation of a cosmic seesaw congruence which unifies the concepts of space and mass. The law of quadratic reciprocity profoundly constrains the subgroup structure of the multiplicative group of units F{sub P{sub {alpha}}}* defined by the field. Four specific outcomes of this organization are (1) a reduction in the computational complexity of the mass state distribution by a factor of {approximately}10{sup 30}, (2) the extension of the genetic divisor concept to the classification of subgroup orders, (3) the derivation of a simple numerical test for any prospective mass number based on the order of the integer, and (4) the identification of direct biological analogies to taxonomy and regulatory networks characteristic of cellular metabolism, tumor suppression, immunology, and evolution. It is generally concluded that the organizing principle legislated by the alliance of quadratic reciprocity with the cosmic seesaw creates a universal optimized structure that functions in the regulation of a broad range of complex phenomena.
Date:
June 1, 2001
Creator:
Dai, Yang; Borisov, Alexey B.; Longworth, James W.; Boyer, Keith & Rhodes, Charles K.
Object Type:
Report
System:
The UNT Digital Library
Ion Heating by Fast Particle Induced Alfvin Turbulence
A novel mechanism that directly transfers energy from Super-Alfvenic energetic ions to thermal ions in high-beta plasmas is described. The mechanism involves the excitation of compressional Alfvin eigenmodes (CAEs) in the frequency range with omega less than or approximately equal to omega(subscript ci). The broadband turbulence resulting from the large number of excited modes causes stochastic diffusion in velocity space, which transfers wave energy to thermal ions. This effect may be important on the National Spherical Torus Experiment (NSTX), and may scale up to reactor scenarios. This has important implications for low aspect ratio reactor concepts, since it potentially allows for the modification of the ignition criterion.
Date:
May 31, 2001
Creator:
Gates, D.; Gorelenkov, N. & White, and R.B.
Object Type:
Report
System:
The UNT Digital Library
Inertial Confinement Fusion Annual Report 1999
The ICF Program has undergone a significant change in 1999 with the decommissioning of the Nova laser and the transfer of much of the experimental program to the OMEGA laser at the University of Rochester. The Nova laser ended operations with the final experiment conducted on May 27, 1999. This marked the end to one of DOE's most successful experimental facilities. Since its commissioning in 1985, Nova performed 13,424 experiments supporting ICF, Defense Sciences, high-power laser research, and basic science research. At the time of its commissioning, Nova was the world's most powerful laser. Its early experiments demonstrated that 3{omega} light could produce high-drive, low-preheat environment required for indirect-drive ICE. In the early 1990s, the technical program on Nova for indirect drive ignition was defined by the Nova technical contract established by National Academy Review of ICF in 1990. Successful completion of this research program contributed significantly to the recommendation by the ICF Advisory Committee in 1995 to proceed with the construction of the National Ignition Facility? Nova experiments also demonstrated the utility of high-powered lasers for studying the physics of interest to Defense Sciences. Now, high-powered lasers along with pulsed-power machines are the principal facilities for studying high energy …
Date:
July 1, 2001
Creator:
Kauffman, R.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
LLE Review, Quarterly Report: Volume 120, July-September 2009
This issue has the following articles: (1) The Omega Laser Facility Users Group Workshop; (2) The Effect of Condensates and Inner Coatings on the Performance of Vacuum Hohlraum Targets; (3) Zirconia-Coated-Carbonyl-Iron-Particle-Based Magnetorheological Fluid for Polishing Optical Glasses and Ceramics; (4) All-Fiber Optical Magnetic Field Sensor Based on Faraday Rotation in Highly Terbium Doped Fiber; (5) Femtosecond Optical Pump-Probe Characterization of High-Pressure-Grown Al{sub 0.86}Ga{sub 0.14}N Single Crystals; (6) LLE's Summer High School Research Program; (7) Laser Facility Report; and (8) National Laser Users Facility and External Users Programs.
Date:
February 19, 2001
Creator:
Edgell, Dana H.
Object Type:
Text
System:
The UNT Digital Library
Observation of Compressional Alfven Modes during Neutral Beam Heating on the National Spherical Torus Experiment
Neutral-beam-driven compressional Alfven eigenmodes (CAE) at frequencies below the ion cyclotron frequency have been observed and identified for the first time in the National Spherical Torus Experiment (NSTX). The modes are observed as a broad spectrum of nearly equally spaced peaks in the frequency range from approximately 0.2 to approximately 1.2 omega(subscript ''ci''). The frequency has a scaling with toroidal field and plasma density consistent with Alfven waves. The modes have been observed with high bandwidth magnetic pick-up coils and with a reflectometer.
Date:
October 3, 2001
Creator:
Fredrickson, E. D.; Gorelenkov, N.; Cheng, C. Z.; Bell, R.; Darrow, D.; Johnson, D. et al.
Object Type:
Report
System:
The UNT Digital Library
Reducing Emissions of Volatile Organic Compounds - Final Report - 08/15/1997 - 02/14/2001
The overall objective of this research was to determine if the shallow suspended growth reactor (SSGR) could provide sufficient treatment performance of organic and reduced sulfur (TRS) compounds, at 50 C to meet the EPA ''cluster rule'' regulatory limits. The biodegradation of a mixture of organic compounds that could be present in pulp and paper high volume low concentration gas streams was evaluated at 50 C in a bench-scale SSGR. The removal of methanol was followed in particular, and was mathematically modeled to evaluate the effect of process design and operating parameters on methanol removal. Additional tests were performed to obtain mass transfer and biodegradation kinetic parameters for the model. The acclimation of microbial populations capable of degrading TRS compounds from various seed sources was studied in batch reactors at 30 and 50 C. The degradation of TRS compounds in bench-scale SSGR was studied at 20-50 C. Also, the biodegradation kinetic and mass transfer coefficients for alpha-terpinene and gamma-terpinene were studied. Finally, a pilot plant was constructed and operated at Simpson pulp and paper mill in Tacoma, WA.
Date:
March 14, 2001
Creator:
Stensel, H. David & Strand, Stuart E.
Object Type:
Report
System:
The UNT Digital Library
New Anion-Exchange Resins for Improved Separations of Nuclear Materials
Improved separations of nuclear materials will have a significant impact upon a broad range of DOE activities. DOE-EM Focus Areas and Crosscutting Programs have identified improved methods for the extraction and recovery of radioactive metal ions from process, waste, and environmental waters as critical needs for the coming years. We propose to develop multifunctional anion-exchange resins that facilitate anion uptake by carefully controlling the structure of the anion receptor site. Our new ion-exchange resins interface the field of ion-specific chelating ligands with robust, commercial ion-exchange technology to provide materials which exhibit superior selectivity and kinetics of sorption and desorption. The following Focus Areas and Crosscutting Programs have described needs that would be favorably impacted by the new material: Efficient Separations and Processing - radionuclide removal from aqueous phases; Plutonium - Pu, Am or total alpha removal to meet regulatory requirement s before discharge to the environment; Plumes - U and Tc in groundwater, U, Pu, Am, and Tc in soils; Mixed Waste - radionuclide partitioning; High-Level Tank Waste - actinide and Tc removal from supernatants and/or sludges. The basic scientific issues which need to be addressed are actinide complex speciation along with modeling of metal complex/functional site interactions in order …
Date:
April 30, 2001
Creator:
Bartsch, Richard A. & Barr, Mary E.
Object Type:
Report
System:
The UNT Digital Library
The Lasso, Yearbook of Howard Payne University, 2001
Yearbook for Howard Payne University in Brownwood, Texas includes photos of and information about the university, student body, professors, and organizations.
Date:
2001
Creator:
Howard Payne University
Object Type:
Yearbook
System:
The Portal to Texas History
The Oklahoma Daily (Norman, Okla.), Vol. 85, No. 56, Ed. 1 Tuesday, November 6, 2001
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
November 6, 2001
Creator:
Johnson, Jennifer
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Optimist (Abilene, Tex.), Vol. 90, No. 12, Ed. 1, Wednesday, October 3, 2001
Tri-weekly student newspaper from Abilene Christian University in Abilene, Texas that includes local, state and campus news along with advertising.
Date:
October 3, 2001
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Oklahoma Daily (Norman, Okla.), Vol. 85, No. 71, Ed. 1 Monday, December 3, 2001
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
December 3, 2001
Creator:
Johnson, Jennifer
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Oklahoma Daily (Norman, Okla.), Vol. 84, No. 171, Ed. 1 Tuesday, July 17, 2001
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
July 17, 2001
Creator:
Benjamin, Deborah
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
["Sisters in Opera" master tape]
Video recording from The Black Academy of Arts and Letters recorded during the "Sisters in Opera" live concert event featuring Barbara Conrad and Harolyn Blackwell accompanied on piano by Joseph Joubert. The concert was held at the Naomi Bruton Theatre on April 29th, 2001. The women sing mezzo-soprano and soprano respectively along with opera apprentice Lynn Roberts.
Date:
April 29, 2001
Creator:
King, Curtis; Conrad, Barbara; Blackwell, Harolyn & Roberts, Lynn
Object Type:
Video
System:
The UNT Digital Library
The Bronco, Yearbook of Hardin-Simmons University, 2001
Yearbook for Hardin-Simmons University in Abilene, Texas includes photos of and information about the university, student body, professors, and organizations.
Date:
2001
Creator:
Hardin-Simmons University
Object Type:
Yearbook
System:
The Portal to Texas History
Range Rider, Fall 2001
The Hardin-Simmons alumni newsletter includes information regarding events at the school and news about university students, staff, and alumni. This issue includes a separately paginated section focusing on the HSU 2001 Homecoming.
Date:
2001
Creator:
Hardin-Simmons University
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
The Optimist (Abilene, Tex.), Vol. 90, No. 4, Ed. 1, Wednesday, September 5, 2001
Tri-weekly student newspaper from Abilene Christian University in Abilene, Texas that includes local, state and campus news along with advertising.
Date:
September 5, 2001
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History