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Proceedings of the Workshop on Geothermal Reservoir Engineering
28
Winter Fuels Report
17
Fiscal Year 1999
11
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9
Journal of Undergraduate Research
9
Notes of Monthly Component Test Program Review Meeting Held with SNPO at WANL
9
OIT Best Practices
8
Saxton Plutonium Project Quarterly Progress Report
8
Distributed Energy & Electric Reliability Fact Sheets
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Chemical Processing Department Monthly Report
6
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ZPR-9 ASSEMBLIES NO. 6-9 CRITICAL EXPERIMENTS.
None
Date:
January 1, 1967
Creator:
Doerner, R.C.; Knapp, W.G.; Karam, R.A. & Butler, D.K.
Object Type:
Report
System:
The UNT Digital Library
ZrO sub 2 and ZrO sub 2 /SiC particle reinforced-MoSi sub 2 matrix composites
ZrO{sub 2}-MoSi{sub 2} and ZrO{sub 2}/SiC-MoSi{sub 2} composites were fabricated by hot pressing and hot pressing/HIP at 1700{degrees}C. No reactions between ZrO{sub 2}, SiC, and MoSi{sub 2} were observed. An amorphous silica glassy phase was present in all composites. Composites with unstabilized ZrO{sub 2} particles exhibited the highest room temperature fracture toughness, reaching a level three times that of pure MoSi{sub 2}. Both the room temperature toughness and 1200{degrees}C strength of ZrO/{sub 2}SiC-MoSi{sub 2} composites were higher than ZrO{sub 2}-MoSi{sub 2} composites, indicating beneficial effects of combined reinforcement phases. Low strength levels were observed at 1400{degrees}C due to the presence of the silica glassy phase. Elimination of glassy phases and refinements in microstructural homogeneity are processing routes important to the optimization of the mechanical properties of these types of composites. 18 refs., 7 figs.
Date:
January 1, 1991
Creator:
Petrovic, J. J.; Bhattacharya, A. K.; Honnell, R. E.; Mitchell, T. E. (Los Alamos National Lab., NM (United States)); Wade, R. K. (Arizona Materials Lab., Tucson, AZ (United States)) & McCellan, K. J. (Case Western Reserve Univ., Cleveland, OH (United States). Dept. of Materials Science and Engineering)
Object Type:
Article
System:
The UNT Digital Library
ZrO sub 2 reinforced-MoSi sub 2 matrix composites
ZrO{sub 2} particle-MoSi{sub 2} matrix composites were fabricated by wet processing/hot pressing, using high quality unstabilized, partially stabilized, and fully stabilized ZrO{sub 2} powders. Composite room temperature indentation fracture toughness increased with increasing volume fraction of ZrO{sub 2} reinforcement. Unstabilized ZrO{sub 2} produced the highest composite fracture toughness, 7.8 MPa m{sup {1/2}} as compared to 2.6 MPa m{sup {1/2}} for pure MoSi{sub 2}. Unstabilized ZrO{sub 2} composites exhibited matrix microcracking, and the spontaneous tetragonal-to-monoclinic ZrO{sub 2} phase transformation induced significant plastic deformation in the MoSi{sub 2} matrix. Partially stabilized ZrO{sub 2} produced a lesser extent of composite fracture toughening, possibly as a result of an inhomogeneous ZrO{sub 2} particle distribution and presence of a glassy phase. 13 refs., 6 figs., 1 tab.
Date:
January 1, 1991
Creator:
Petrovic, J. J.; Honnell, R. E.; Mitchell, T. E. (Los Alamos National Lab., NM (USA)); Wade, R. K. (Arizona Materials Lab., Tucson, AZ (USA)) & McClellan, K. J. (Case Western Reserve Univ., Cleveland, OH (USA). Dept. of Materials Science and Engineering)
Object Type:
Article
System:
The UNT Digital Library
ZT-40M system design, modification, and installation
ZT-40 is a reversed field pinch experiment which had been operated as originally designed, with a ceramic discharge tube until November 1980. At that time, the experiment was shut down for major modifications. This paper will describe these modifications in general and discuss in detail the design of the energy system.
Date:
January 1, 1981
Creator:
Hammer, C. F.
Object Type:
Article
System:
The UNT Digital Library
ZT-P: an advanced air core reversed field pinch prototype
The ZT-P experiment, with a major radius of 0.45 m and a minor radius of 0.07 m, was designed to prototype the next generation of reversed field pinch (RFP) machines at Los Alamos. ZT-P utilizes an air-core poloidal field system, with precisely wound and positioned rigid copper coils, to drive the plasma current and provide plasma equilibrium with intrinsically low magnetic field errors. ZT-P's compact configuration is adaptable to test various first wall and limiter designs at reactor-relevant current densities in the range of 5 to 20 MA/m/sup 2/. In addition, the load assembly design allows for the installation of toroidal field divertors. Design of ZT-P began in October 1983, and assembly was completed in October 1984. This report describes the magnetic, electrical, mechanical, vacuum, diagnostic, data acquisition, and control aspects of the machine design. In addition, preliminary data from initial ZT-P operation are presented. Because of ZT-P's prototypical function, many of its design aspects and experimental results are directly applicable to the design of a next generation RFP. 17 refs., 47 figs.
Date:
January 1, 1986
Creator:
Schoenberg, K. F.; Buchenauer, C. J.; Burkhardt, L. C.; Caudill, L. D.; Dike, R. S.; Dominguez, T. et al.
Object Type:
Report
System:
The UNT Digital Library
ZTI: An ignition class reversed-field pinch
A cost-optimized conceptual design of an intermediate-step, ignition-class RFP device (ZTI)for the study of alpha-particle physics and burn control in a DT plasma is reported. With major and minor plasma radii R{sub T} = 2.4m and {tau}{sub p} = 0.4m, respectively, and for conservative extrapolations of experimental energy-confinement times, ion-density profiles, and impurity levels, the ZTI operating conditions during a 5-s period of constant fusion power are: toroidal plasma current I{sub {phi}} {approx equal} 9 MA, plasma temperature T {approx equal} 11 keV, plasma density n{sub i} {approx equal} 3 {times} 10{sup 20} m{sup {minus}3}, fusion power P{sub F} {approx equal} 100 MW, and physics Q-value Q{sub p} {approx equal} 5 for a total machine size that corresponds to P{sub F}/M{sub FPC} {approx equal} 590 kW/tonne. This physics design point was adopted as a strawman'' with which to examine the requirements of ohmic heating to DT ignition and to perform a cost-optimized magnetics design. The ZTl design reflects potentially significant cost savings relative to similar ignition-class tokamaks for device parameters that reside on the path to a viable commercial RFP reactor. The methodology and results of coupling realistic physics, engineering, and cost models through a multi-dimensional optimizer are reported for …
Date:
January 1, 1990
Creator:
Bathke, C. G.; Krakowski, R. A.; Miller, R. L. & Werley, K. A.
Object Type:
Article
System:
The UNT Digital Library
ZTI: Preliminary characterization of an ignition class reversed-field pinch
A preliminary cost-optimized conceptual design of an intermediate-step, ignition-class RFP device (ZTI) for the study of alpha-particle physics in a DT plasma is reported. The ZTI design reflects potentially significant cost savings relative to similar ignition-class tokamaks for device parameters that reside on the path to a viable commercial RFP reactor. Reductions in both device costs and number of steps to commercialization portend a significantly reduced development cost for fusion. The methodology and result and coupling realistic physics, engineering, and cost models through a multi-dimensional optimizer are reported for ZTI, which is a device that would follow the 2--4 MA ZTH on a {approx gt} 1996--98 timescale. 15 refs., 7 figs., 2 tabs.
Date:
January 1, 1990
Creator:
Bathke, C. G.; Krakowski, R. A.; Miller, R. L. & Werley, K. A.
Object Type:
Article
System:
The UNT Digital Library