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Coulomb clusters in RETRAP
Storage rings and Penning traps are being used to study ions in their highest charge states. Both devices must have the capability for ion cooling in order to perform high precision measurements such as mass spectrometry and laser spectroscopy. This is accomplished in storage rings in a merged beam arrangement where a cold electron beam moves at the speed of the ions. In RETRAP, a Penning trap located at Lawrence Livermore National Laboratory, a sympathetic laser/ion cooling scheme has been implemented. In a first step, singly charged beryllium ions are cooled electronically by a tuned circuit and optically by a laser. Then hot, highly charged ions are merged into the cold Be plasma. By collisions, their kinetic energy is reduced to the temperature of the Be plasma. First experiments indicate that the highly charged ions form a strongly coupled plasma with a Coulomb coupling parameter.
Date:
October 22, 1998
Creator:
Beck, B. R.; Church, D. A.; Gruber, L.; Holder, J. P.; Schneider, D. & Steiger, J.
Object Type:
Article
System:
The UNT Digital Library
Cryocooler applications for high-temperature superconductor magnetic bearings.
The efficiency and stability of rotational magnetic suspension systems are enhanced by the use of high-temperature superconductor (HTS) magnetic bearings. Fundamental aspects of the HTS magnetic bearings and rotational magnetic suspension are presented. HTS cooling can be by liquid cryogen bath immersion or by direct conduction, and thus there are various applications and integration issues for cryocoolers. Among the numerous cryocooler aspects to be considered are installation; operating temperature; losses; and vacuum pumping.
Date:
May 22, 1998
Creator:
Niemann, R. C.
Object Type:
Article
System:
The UNT Digital Library
CSER-98-002: Criticality analysis for the storage of special nuclear material sources and standards in the WRAP Facility
The Waste Receiving and Processing (WRAP) Facility will store uranium and transuranic (TRU) sources and standards for certification that WRAP meets the requirements of the Quality Assurance Program Plan (QAPP) for the Waste Isolation Pilot Plant (WIPP). In addition, WRAP must meet internal requirements for testing and validation of measuring instruments for nondestructive assay (NDA). In order to be certified for WIPP, WRAP will participate in the NDA Performance Demonstration Program (PDP). This program is a blind test of the NDA capabilities for TRU waste. It is intended to ensure that the NDA capabilities of this facility satisfy the requirements of the quality assurance program plan for the WIPP. The PDP standards have been provided by the Los Alamos National Laboratory (LANL) for this program. These standards will be used in the WRAP facility. To internally check the accuracy and sensitivity of the NDA instruments, a further set of sources and standards will also be used by the facility. Each sealed source or standard will be referred to herein as a unit. Various combinations of these units will be placed in test drums and/or boxes which will be subject to their own limits until unloaded. There will be two sealed …
Date:
June 22, 1998
Creator:
Goldberg, H. J.
Object Type:
Report
System:
The UNT Digital Library
The Cuero Record (Cuero, Tex.), Vol. 104, No. 16, Ed. 1 Wednesday, April 22, 1998
Weekly newspaper from Cuero, Texas that includes local, state, and national news along with advertising.
Date:
April 22, 1998
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Current 3 {omega} large optic test procedures and data analysis for the quality assurance of National Ignition Facility
A reliable metric is required to describe the damage resistance of large aperture 3{omega} transmissive optics for the National Ignition Facility (NIF) laser. The trend from single site testing to the more statistically valid Gaussian scanning test requires a well modeled experimental procedure, accurate monitoring of the test parameters, and careful interpretation of the resulting volumes of data. The methods described here provide reliable quality assurance data, as well as intrinsic damage concentration information used to predict the performance expected under use conditions. This paper describes the equipment, test procedure, and data analysis used to evaluate large aperture 3{omega} optics for the NIF laser.
Date:
December 22, 1998
Creator:
Schwartz, S; Feit, M D; Kozlowski, M R & Mouser, R P
Object Type:
Article
System:
The UNT Digital Library
The Daily Chickasha Star (Chickasha, Okla.), Vol. 97, No. 13, Ed. 1 Thursday, January 22, 1998
Newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 22, 1998
Creator:
Settle, David
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Daily Chickasha Star (Chickasha, Okla.), Vol. 97, No. 59, Ed. 1 Wednesday, April 22, 1998
Newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 22, 1998
Creator:
Settle, David
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Daily Chickasha Star (Chickasha, Okla.), Vol. 97, No. 78, Ed. 1 Friday, May 22, 1998
Newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
May 22, 1998
Creator:
Settle, David
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Daily Chickasha Star (Chickasha, Okla.), Vol. 97, No. 120, Ed. 1 Wednesday, July 22, 1998
Newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 22, 1998
Creator:
Settle, David
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Daily Chickasha Star (Chickasha, Okla.), Vol. 97, No. 140, Ed. 1 Saturday, August 22, 1998
Newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
August 22, 1998
Creator:
Settle, David
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Daily Chickasha Star (Chickasha, Okla.), Vol. 97, No. 156, Ed. 1 Tuesday, September 22, 1998
Newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 22, 1998
Creator:
Settle, David
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Daily Chickasha Star (Chickasha, Okla.), Vol. 97, No. 178, Ed. 1 Thursday, October 22, 1998
Newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
October 22, 1998
Creator:
Settle, David
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Dallas Voice (Dallas, Tex.), Vol. 15, No. 4, Ed. 1 Friday, May 22, 1998
Weekly newspaper from Dallas, Texas that includes local, state, and national news and advertising of interest to the Lesbian, Gay, Bisexual, and Transgender (LGBT) community.
Date:
May 22, 1998
Creator:
Vercher, Dennis
Object Type:
Newspaper
System:
The UNT Digital Library
DEFORMATION MONITORING ANALYSIS
None
Date:
September 22, 1998
Creator:
Lin, M. & Kicker, D.
Object Type:
Report
System:
The UNT Digital Library
Design of the HYPRE preconditioner library
The authors discuss the design of hypre, an object-oriented library for the solution of extremely large sparse linear systems on parallel computers. The mathematical emphasis of hypre is on modern powerful and scalable preconditioners. The design of hypre allows it to be used as both a solver package and a framework for algorithm development. The object model used for hypre is more general and flexible than the current generation of solver libraries.
Date:
September 22, 1998
Creator:
Chow, E; Cleary, A & Falgout, R
Object Type:
Article
System:
The UNT Digital Library
Development and compatibility of magnesium matrix fuel plates clad with 6061 aluminum alloy.
Aluminum (Al) is a commonly used matrix for research reactor fuel plates. It has been found that a reaction between the fuel and the aluminum matrix may reduce or increase the irradiation stability of the fuel. To further understand the contribution of the reaction to the irradiation stability, experiments to develop a non-reacting matrix were performed. The work focused on magnesium (Mg), which is an excellent non-reacting matrix candidate and has a neutron absorption coefficient similar to Al. To avoid the formation of a liquid Al/Mg phase, improvements were made to the roll bonding process to achieve acceptable bonding at 415 C. After these methods were developed, fuel plates were produced with two fuels, uranium (U)-2 w/o molybdenum (Mo) and U-10-w/o Mo with two matrices, Al and Mg. A reaction between the magnesium and the 6061 Al cladding was discovered to take place during the processing at 415 C. To minimize the amount of reaction, methods were successfully developed to roll bond the fuel plates at 275 C. No reaction zone was observed in fuel plates processed at 275 C. Using this method, fuel plates with a Mg matrix are planned to be fabricated and included in the next irradiation …
Date:
October 22, 1998
Creator:
Wiencek, T. C.
Object Type:
Article
System:
The UNT Digital Library
Development, field testing of a laser instrument for the measurement of sediment reference concentration in the MARGINS Program. Final report
A small grant was added to an ongoing Navy program to extend the scope of ongoing work by development of a new laser instrument. The instrument, MSCAT (Miniature Scattering and Transmissometry) uses small angle scattering to obtain the needed multi-parameter information for measurement of particle size distribution and number density. During the short course of the grant, the instrument was built and tested in a field experiment off the coast of North Carolina. Useful data were obtained, and these have been presented at the Fall Meeting of the American Geophysical Union in 1994.
Date:
May 22, 1998
Creator:
Agrawal, Yogesh C.
Object Type:
Report
System:
The UNT Digital Library
Development of radiation stable plastic scintillator. Final technical report, July 1991--July 1993
The Detector Development Group at the University of Florida has identified the only known optically radiation hard polymer, scintillator and wavelength shifter materials. The authors summarize their findings here. They conducted an extensive study of siloxane polymers using monomers of dimethyl, diphenyl and methylphenyl siloxanes. An important finding of that study was that polymethylphenylsiloxane is a candidate polymer for use at the SSC. However, the most important result of that work was the demonstration of the existence of optical polymers with extreme resistance to radiation damage. It held out the promise that other possibly more convenient polymers with similar properties could be identified. The first high viscosity, transparent, radiation hard siloxane with high fluor solubility was processed into prototype plates. The authors propose a mechanism to account for radiation induced annealable color center formation in commercial scintillator polymers such as PS and PMMA. The authors produced analogues of these polymers with T{sub g} < room temperatures. These polymers are optically radiation hard. The University of Florida has applied for a patent on this breakthrough discovery. It was found that dye mobility for radiation hard elastomers (T{sub g} < room temperature) was unacceptable over a period of one year. Dyes would …
Date:
July 22, 1998
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Development of structural design criteria for ITER.
The irradiation environment experienced by the in-vessel components of fusion reactors such as HER presents structural design challenges not envisioned in the development of existing structural design criteria such as the ASME Code or RCC-MR. From the standpoint of design criteria, the most significant issues stem from the irradiation-induced changes in material properties, specifically the reduction of ductility, strain hardening capability, and fracture toughness with neutron irradiation. Recently, Draft 7 of the interim ITER structural design criteria (ISDC), which provide new rules for guarding against such problems, was released for trial use by the ITER designers. The new rules, which were derived from a simple model based on the concept of elastic follow up factor, provide primary and secondary stress limits as functions of uniform elongation and ductility. The implication of these rules on the allowable surface heat flux on typical first walls made of type 316 stainless steel and vanadium alloys are discussed.
Date:
June 22, 1998
Creator:
Majumdar, S.
Object Type:
Article
System:
The UNT Digital Library
The Dublin Citizen (Dublin, Tex.), Vol. 8, No. 21, Ed. 1 Thursday, January 22, 1998
Weekly newspaper from Dublin, Texas that includes local, state, and national news along with advertising.
Date:
January 22, 1998
Creator:
Wright, Karen
Object Type:
Newspaper
System:
The Portal to Texas History
The Dublin Citizen (Dublin, Tex.), Vol. 9, No. 8, Ed. 1 Thursday, October 22, 1998
Weekly newspaper from Dublin, Texas that includes local, state, and national news along with advertising.
Date:
October 22, 1998
Creator:
Wright, Karen
Object Type:
Newspaper
System:
The Portal to Texas History
Duval County Picture (San Diego, Tex.), Vol. 13, No. 16, Ed. 1 Wednesday, April 22, 1998
Weekly newspaper from San Diego, Texas that includes local, state, and national news along with advertising.
Date:
April 22, 1998
Creator:
Cardenas, Alfredo E.
Object Type:
Newspaper
System:
The Portal to Texas History
Duval County Picture (San Diego, Tex.), Vol. 13, No. 29, Ed. 1 Wednesday, July 22, 1998
Weekly newspaper from San Diego, Texas that includes local, state, and national news along with advertising.
Date:
July 22, 1998
Creator:
Cardenas, Alfredo E.
Object Type:
Newspaper
System:
The Portal to Texas History
Dynamic equation of state and strength properties of unreacted PBXW-128 explosive
Shock equation of state and strength data have been obtained on the explosive PBXW-128 over the pressure range O-3 GPa using gun impact techniques and velocity interferometry diagnostics. Nonlinear shock-velocity-versus-particle velocity behavior is observed. Possible mechanisms are discussed and a Hug.oniot equation of slate model for the data is provided.
Date:
September 22, 1998
Creator:
Chhabildas, L. C.; Grady, D. E.; Reinhart, W. D. & Wilson, L. T.
Object Type:
Article
System:
The UNT Digital Library