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310
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Extracted current densities from surface conversion sources of negative ions
The condition for extracting a maximum negative ion current density is found when the product of the radius of the negative ion conversion electrode, the cross-section for negative and positive ion recombination, and the density of positive ions in the ion source equals one. The optimum output is obtained at the highest positive ion density and the smallest electrode radius.
Date:
February 10, 1982
Creator:
Fink, J.H.
Object Type:
Report
System:
The UNT Digital Library
Experimental observations and model calculations of impurity radiation in a plasma gun compact torus experiment
Several types of radiation measurements were performed on the Beta II compact forms experiment. Among these are time integrated spectra ranging in wavelength from the vuv to the uv, time resolved bolometer measurements of radiation from the x-ray to the infrared, and time and wavelength resolved measurements of certain spectral lines. It is difficult to relate any one of these measurements to plasma parameters of interest such as temperature, density, or impurity content. In this report we compare the results of these, and other measurements with two simple models of the power balance in the plasma in order to estimate the effect of carbon and oxygen impurities on plasma lifetime.
Date:
August 10, 1982
Creator:
Goldenbaum, G. C.; Granneman, E. H. A.; Hartman, C. W.; Prono, D. S.; Taska, J. & Turner, W. C.
Object Type:
Report
System:
The UNT Digital Library
Synthesis and characterization of a new silicone multiblock polymer
The Lawrence Livermore National Laboratory (LLNL) has an active interest in the synthesis of new polysiloxanes as base polymers for cellular silicone materials. These elastomers have properties uniquely suited to very specific engineering requirements. While the polymers which we have prepared via random equilibrium of various cyclic tetrasiloxanes have adequate properties for certain applications, there is evidence to suggest that alternating block polysiloxanes prepared via condensation-polymerization techniques have properties more suited to our end uses as flexible foam materials (cushions). The synthetic sequence developed to prepare these materials involves reactions of functionally terminated (silylamino and silanol) polysiloxane oligomers to produce alternating multiblock (ABAB...) materials of high molecular weight. Dialkylamines are condensation byproducts in this reaction. The analysis and characterization of these multiblock polymers is reported.
Date:
May 10, 1982
Creator:
Riley, M.O.; Kolb, J.R. & Jessop, E.S.
Object Type:
Report
System:
The UNT Digital Library
Uniform laser ablative acceleration of targets at 10/sup 14/ W/cm/sup 2/
We present the first detailed investigations of the ablative acceleration of planar targets while simultaneously using high irradiance (10/sup 14/ W/cm/sup 2/), large focal diameters (1 mm) and long laser pulse duration (3 nsec). Included are measurements of target preheat, ablation pressures and uniformity achieved under these conditions. Targets were accelerated to high velocities with velocity profile uniformity approaching that required for high gain pellet implosions.
Date:
August 10, 1982
Creator:
Obenschain, S. P.; Whitlock, R. R.; McLean, E. A.; Ripin, B. H.; Price, R. H.; Phillion, D. W. et al.
Object Type:
Report
System:
The UNT Digital Library
Pressure limits of negative ion sources based upon gas efficiency and extracted ion-current density
The nature of the electrical discharge has an obvious impact upon the gas efficiency of an ion source and on the current density whch can be drawn from it. However external factors, such as the conductance of the grids and the background pressure along the beamline, also have an effect. Simple approximations based upon these factors show that there is a lower limit to the pressure of an ion source, which can deliver an ion beam of given current density at a specific gas efficiency. Estimates of ion stripping losses in a double gridded structure show that for all practical purposes, there is an upper limit as well.
Date:
March 10, 1982
Creator:
Fink, J.
Object Type:
Report
System:
The UNT Digital Library
Investigation into the repetition-rate limitations of magnetic switches
The use of magnetic switches to generate high power pulses has opened up a whole new spectrum of possibilities. Here we describe an investigation into the maximum repetition rates possible with these devices.
Date:
February 10, 1982
Creator:
Birx, D. L.; Reginato, L. L. & Schmidt, J. A.
Object Type:
Article
System:
The UNT Digital Library
Collins' bypass for the main ring
Design of the bypass for the main ring at Fermilab is discussed. Specific design features discussed include space, path length, geometric closure, matching of betatron functions, and external dispersion. Bypass parameters are given. (GHT)
Date:
August 10, 1982
Creator:
Ohnuma, S.
Object Type:
Report
System:
The UNT Digital Library
[Photograph 2012.201.B0094.0733]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Coming out of the blocks in the 200-meter dash are (left to right) Clyde Neal of Eastern, Don Bly and Dannie Carter, both of OU, and Desmond Ross of Eastern."
Date:
April 10, 1982
Creator:
Wilson, George R.
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0143.0524]
Photograph used for a story in the Oklahoma Times newspaper.
Date:
November 10, 1982
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0136.0197]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "R. Norvell Clarke walks through a hallway at the Davidson courts building after testifying to the multicounty grand jury Tuesday about his donations to Gov. David Walters' campaign."
Date:
November 10, 1982
Creator:
Gooch, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0139.0260]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "John Cole, seated, is given a cake during a community celebration for his 100th birthday."
Date:
October 10, 1982
Creator:
Burnett, Roberta
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0147.0014]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "concentration paid off for Bryon Cox Saturday at the Special Olympic, sponsored by Oklahoma City's Downtown Kiwanis Club."
Date:
April 10, 1982
Creator:
Miller, Joe
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0138.0601]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "OKLAHOMA PUBLISHING CO.., EMPLOYEES'..."
Date:
May 10, 1982
Creator:
Aker, Joe
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0143.0525]
Photograph used for a story in the Oklahoma Times newspaper.
Date:
November 10, 1982
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0150.0473]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "Mike Eckert and Patty Kelly, both 17, have gone to outlandish lengths during the past two weeks to get Norman High students to contribute to the Cleveland County Christmas Store."
Date:
December 10, 1982
Creator:
Albright, Bob
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0149.0768]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "University of Oklahoma basketball fans try to show their indifference to the announcement of Kansas State University's lineup Wednesday night at Lloyd Noble Center."
Date:
February 10, 1982
Creator:
McDaniel, David
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0150.0505]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "Don Eckroat, of Eckroat Seed Company, displays some of the tools beginners should invest in for a successful garden."
Date:
March 10, 1982
Creator:
Wilson, George R.
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0166.0023]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "Linda Doolin, center, discusses the campaign strategy with Mr. and Mrs. Dan Macer."
Date:
September 10, 1982
Creator:
Southerland, Paul B.
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0162.0686]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Windy Day at Woodson Park -- Amy Diver, 10, gears up for a windy kite launching at Southside Woodson Park this weekend when the wind had more fun than the other kids, winding up with several kites when strings snapped."
Date:
March 10, 1982
Creator:
McDaniel, David
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0162.0556]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "Mary Dinabury works on a painting . The artist's works soon will be displayed throughout the country ...."
Date:
June 10, 1982
Creator:
Hellstern, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0151.0003]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "Howard was concerned about his fellow workers"
Date:
August 10, 1982
Creator:
Miller, Joe
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0143.0522]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "The gadget Sue Corbett is using winds skeins of thread she has dyed into a ball."
Date:
November 10, 1982
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0143.0523]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "Sue Corbett uses a foot-powered machine to take a skein of thread of the large cone of thread on the floor."
Date:
November 10, 1982
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0139.0010]
Photograph used for a story in the Oklahoma Times newspaper. Caption: "Rod Coker, Harrah. Football."
Date:
December 10, 1982
Creator:
Southerland, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History