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644 Matching Results
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Some frontiers of accelerator physics
This paper discusses some concepts of future accelerators such as free electron lasers, two beam accelerator; and plasma-based adiabatic compressor. 12 refs., 10 figs., 5 tabs. (LSP)
Date:
October 13, 1989
Creator:
Sessler, A. M.
Object Type:
Article
System:
The UNT Digital Library
A fast large-area position-sensitive time-of-flight neutron detection system
A new position-sensitive time-of-flight neutron detection and histograming system has been developed for use at the Intense Pulsed Neutron Source. Spatial resolution of roughly 1 cm {times} 1 cm and time-of-flight resolution of {approximately}1 {mu}sec are combined in a detection system which can ultimately be expanded to cover several square meters of active detector area. This system is based on the use of arrays of cylindrical one-dimensional position-sensitive proportional counters, and is capable of collecting the x-y-t data and sorting them into histograms at time-averaged data rates up to {approximately}300,000 events/sec over the full detector area and with instantaneous data rates up to more than fifty times that. Numerous hardware features have been incorporated to facilitate initial tuning of the position encoding, absolute calibration of the encoded positions, and automatic testing for drifts. 7 refs., 11 figs., 1 tabs.
Date:
October 13, 1989
Creator:
Crawford, R.K. & Haumann, J.R.
Object Type:
Article
System:
The UNT Digital Library
ITER disruption modeling using TSC (Tokamak Simulation Code)
Design of the ITER vacuum vessel (VV) is driven strongly by disruption-induced forces. We use the Tokamak Simulation Code (TSC) to model disruptions for the ITER physics phase (I{sub p} = 22 MA) and predict the time evolution of currents and forces on the VV. For a plasma vertically displaced to Z{sub axis} = {minus}1.0m before disruption and decaying at a rate of < dI{sub p}/dt > {approx equal} {minus}1.0MA/ms, the induced VV current peaks at 18 MA. The maximum radial VV force F{sub R} is 56 MN/rad; the maximum vertical force F{sub Z} is 5.4 MN/rad; and the maximum VV disruption pressure is 1.0 MPa. Variations in VV resistance (20 - 160 {mu}{Omega}) and < dI{sub p}/dt > (1 - 2.5 MA/ms) do not change F{sub R} significantly. The dependence of the forces on the initial plasma displacement and < dI{sub p}/dt > behavior, and the responses of other conducting structures are discussed. 2 refs., 6 figs.
Date:
November 13, 1989
Creator:
Sayer, R. O.; Peng, Y. K. M.; Wesley, J. C.; Jardin, S. C. (Oak Ridge National Lab., TN (USA); General Atomics, San Diego, CA (USA) & Princeton Univ., NJ (USA). Plasma Physics Lab.)
Object Type:
Article
System:
The UNT Digital Library
L-shell photoabsorption spectroscopy for solid metals: Ti, V, Cr, Fe, Ni, Cu
Synchrotron radiation measurements of near-threshold and broad-range (400--1500 eV) absolute photoabsorption cross sections were made for five transition metals with {plus minus}10% overall uncertainties. Fine structure details of 2p-3d autoionizing resonances are shown with better than 1.0 eV resolution for solid metals: Ti, V, Cr, Fe, Ni, and Cu. Fine structure similar to what we measured can be produced using a multi-configuration Dirac Fock (MCDF) model if a statistical distribution is assumed for the initial atomic states. Calculations were performed in intermediate coupling with configuration interactions by Mau H. Chen. The results are compared with other experimental work and theoretical methodologies. 18 refs., 7 figs.
Date:
September 13, 1989
Creator:
Del Grande, N.K. (Lawrence Livermore National Lab., CA (USA))
Object Type:
Article
System:
The UNT Digital Library
Director to resign from UNT academy
Newspaper article announcing Rogers Redding's decision to resign from the position of director of the Texas Academy of Mathematics and Science for a one-year term as a visiting faculty member at the U. S. Air Force Academy in Colorado.
Date:
January 13, 1989
Creator:
Cobb, Dawn
Object Type:
Clipping
System:
The UNT Digital Library
[Photograph 2012.201.B0110.0063]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Chad Brown, OL, Hennessey,: after being named the most outstanding offensive lineman at Oklahoma State's summer camp."
Date:
December 13, 1989
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
UNT offers program for gifted students
Article giving an overview of the creation of the Texas Academy of Mathematics and Science, its admissions process, and a list of graduating seniors of 1990.
Date:
August 13, 1989
Creator:
unknown
Object Type:
Clipping
System:
The UNT Digital Library
[Letter from Julian Stanley to Manus Donahue, June 13, 1989]
Letter from Julian Stanley to Manus Donahue, on June 13, 1989, welcoming him to the administrative team of the Texas Academy of Mathematics and Science, and offering a few suggestions on expanding opportunities for the students.
Date:
June 13, 1989
Creator:
Stanley, Julian C.
Object Type:
Letter
System:
The UNT Digital Library
[Photograph 2012.201.B0147.0326]
Photograph used for a story in the Daily Oklahoman newspaper.
Date:
October 13, 1989
Creator:
Southerland, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0143.0004]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Iowa's Jeff Small tags the 89ers' Scott Coolbaugh on the front end of a double play in Thursday's game."
Date:
July 13, 1989
Creator:
Hoke, Doug
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0153.0597]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Buffalo's Scott Little dives back to first base before Oklahoma City's Jack Daugherty can handle the pickoff throw Tuesday night at All Sports Stadium."
Date:
June 13, 1989
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0154.0401]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
October 13, 1989
Creator:
Klock, Roger
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0150.0762]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Edmond junior Chris Edgmon is the defending Class 5A medalist."
Date:
July 13, 1989
Creator:
Hellstern, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0150.0761]
Photograph used for a story in the Daily Oklahoman newspaper.
Date:
July 13, 1989
Creator:
Hellstern, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0147.0325]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "John Coyle, a member of the First Amendment Lawyers Association, believes that arrangement means prosecutors and police decide what is obscene."
Date:
October 13, 1989
Creator:
Southerland, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Letter from Valleau Wilkie to Jack Davis, October 13, 1989]
Photocopy of a letter from Valleau Wilkie, executive director of the Sid W. Richardson Foundation to Jack Davis, co-director of North Texas Institute for Educators on the Visual Arts. The letter is in regards to previous correspondence between Wilkie and Davis about the foundation grant support and how the Director of the foundation did not find it possible to approve a grant in support of the North Texas Institute for Educators on the Visual Arts program.
Date:
October 13, 1989
Creator:
Wilkie, Valleau
Object Type:
Letter
System:
The UNT Digital Library
At the head of its class
A newspaper clipping featuring an article on children from Forest Hill Elementary School at the head of their class with high grades in arts education. The article goes into the fact that arts education has been around since the 1950s but there never has been such an interest until now, art education is being re-examined. Art is being viewed as important to all students as a means of enchaining learning and other disciplines such as math and science. The article continues into the hard work that Getty Center and the education reformation program has undergone to see changes in the schools curriculum.
Date:
April 13, 1989
Creator:
Tyson, Janet
Object Type:
Clipping
System:
The UNT Digital Library
Microwave Tokamak Experiment (MTX) ohmic heating system
The ohmic heating system for the Microwave Tokamak Experiment (MTX) at Lawrence Livermore National Laboratory (LLNL) provides both the voltage for the initial breakdown phase and the energy to drive the plasma current to a value of 400 kA or greater. Providing this voltage and flux swing requires a one-turn loop voltage of about 25 volts (11 kV across the coil) and a magnetic flux swing of 2 volt- seconds. This voltage and flux swing are accomplished by charging the ohmic heating coils to 20 kA, at which point the current is commutated off into a resistor generating the 11 kV across the coil. When the current passes through zero, another power supply drives the current in the opposite polarity to 20 kA, thus completing the full 2 volt-second flux swing. This paper describes the design features and performance of the ohmic heating circuit, with emphasis on the commutation circuit. In addition, the paper describes the use of the ohmic heating system for discharge cleaning and the changeover procedure. 3 refs., 4 figs., 1 tab.
Date:
September 13, 1989
Creator:
Jackson, M.C. (Lawrence Livermore National Lab., CA (USA))
Object Type:
Article
System:
The UNT Digital Library
Floating data acquisition system for microwave calorimeter measurements on MTX
A microwave calorimeter has been designed for making 140-GHz absorption measurements on the MTX. Measurement of the intensity and spatial distribution of the FEL-generated microwave beam on the inner wall will indicate the absorption characteristics of the plasma when heated with a 140 GHz FEL pulse. The calorimeter works by monitoring changes of temperature in silicon carbide tiles located on the inner wall of the tokamak. Thermistors are used to measure the temperature of each tile. The tiles are located inside the tokamak about 1 cm outside of the limiter radius at machine potential. The success of this measurement depends on our ability to float the data acquisition system near machine potential and isolate it from the rest of the vault ground system. Our data acquisition system has 48 channels of thermistor signal conditioning, a multiplexer and digitizer section, a serial data formatter, and a fiber-optic transmitter to send the data out. Additionally, we bring timing signals to the interface through optical fibers to tell it when to begin measurement, while maintaining isolation. The receiver is an HP 200 series computer with a serial data interface; the computer provides storage and local display for the shot temperature profile. Additionally, the …
Date:
September 13, 1989
Creator:
Sewall, N.R. & Meassick, S. (Lawrence Livermore National Lab., CA (USA))
Object Type:
Article
System:
The UNT Digital Library
[Photograph 2012.201.B0353.0602]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Waves driven by a frigid wind made this dock on the southwest quadrant of Lake Overholser look like something from the antarctic."
Date:
February 13, 1989
Creator:
Southerland, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0313B.0635]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Virgil Jensen - at regents meeting"
Date:
October 13, 1989
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0354.0437]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Above, Rachel McGee, left, and Charlotte Rutledge."
Date:
October 13, 1989
Creator:
Southerland, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0225.0244]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Above Bill and Gay Bartley, left, join Bruce and Dixie Gordon at the closing party of the Decorators' Show House."
Date:
May 13, 1989
Creator:
McDaniel, David
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0227.0215]
Photograph used for a story in the Daily Oklahoman newspaper.
Date:
October 13, 1989
Creator:
Southerland, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History