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Recent experience in the fabrication and brazing of ceramic beam tubes for kicker magnets at FNAL

Description: Ceramic beam tubes are utilized in numerous kicker magnets in different accelerator rings at Fermi National Accelerator Laboratory. Kovar flanges are brazed onto each beam tube end, since kovar and high alumina ceramic have similar expansion curves. The tube, kovar flange, end piece, and braze foil (titanium/incusil) alloy brazing material are stacked in the furnace and then brazed in the furnace at 1000 C. The ceramic specified is 99.8% Alumina, Al{sub 2}O{sub 3}, a strong recrystallized high-… more
Date: June 1, 2008
Creator: Ader, C. R.; Jensen, C.; Reilly, R.; Snee, D. & Wilson, J. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A dynamic dispersion insert in the Fermilab Main Injector for momentum collimation

Description: The Fermilab Main Injector (MI) accelerator is designed as a FODO lattice with zero dispersion straight sections. A scheme will be presented that can dynamically alter the dispersion of one of the long straight sections to create a non-zero dispersion straight section suitable for momentum collimation. During the process of slip stacking DC beam is generated which is lost during the first few milliseconds of the ramp. A stationary massive primary collimator/absorber with optional secondary mask… more
Date: June 1, 2007
Creator: Johnson, D. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Mechanisms of flow through compressible porous beds in sedimentation, filtration, centrifugation, deliquoring, and ceramic processing. [Annual report], February 1, 1991--January 31, 1992

Description: The University of Houston research program is aimed at the specific area of solid/liquid separation including sedimentation, thickening, cake filtration, centrifugation, expression, washing, deep-bed filtration, screening, and membrane separation. Unification of the theoretical approaches to the various solid/liquid separation operations is the principle objective of the research. Exploring new aspects of basic separation mechanisms, verification of theory with experiment, development of labora… more
Date: June 1, 1992
Creator: Tiller, F. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Mechanical behavior of MoSi{sub 2} and MoSi{sub 2} composites

Description: MoSi{sub 2} is a key member of the new class high temperature structural silicide materials. Important features of the mechanical behavior of MoSi{sub 2} and MoSi{sub 2} composites are reviewed. The mechanical properties of MoSi{sub 2} single crystals, polycrystalline MoSi{sub 2}, and MoSi{sub 2}-based composites are discussed in association with properties such as elevated temperature deformation and low temperature fracture toughness. Interrelationships between single crystal, polycrystal, an… more
Date: June 1, 1994
Creator: Petrovic, J. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Post-irradiation deformation characteristics of heavy-ion irradiated 304L SS

Description: Post-irradiation deformation behavior in Ni-ion-irradiated 304L stainless steel (SS) is examined as a function of radiation dose and deformation temperature. For similar strain levels, specimens exhibit a transition from dislocation slip to deformation-induced twinning at 25C with increasing radiation dose. At 288C twinning is no longer observed and highly localized slip occurs by the formation of narrow ``channels`` containing a reduced defect density. The observations are discussed in terms o… more
Date: June 1, 1994
Creator: Cole, J. I. & Bruemmer, S. M.
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Partner: UNT Libraries Government Documents Department
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Denuded Zones, Diffusional Creep, and Grain Boundary Sliding

Description: The appearance of denuded zones following low stress creep in particle-containing crystalline materials is both a microstructural prediction and observation often cited as irrefutable evidence for the Nabarro-Herring mechanism of diffusional creep. The denuded zones are predicted to be at grain boundaries that are orthogonal to the direction of the applied stress. Furthermore, their dimensions should account for the accumulated plastic flow. In the present paper, the evidence for such denuded z… more
Date: June 27, 2001
Creator: Wadsworth, J; Ruano, O A & Sherby, O D
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Performance analysis of HD1: a 16 Tesla Nb3Sn dipole Magnet

Description: The Superconducting Magnet Group at Lawrence Berkeley National Laboratory (LBNL) has been developing technology for high field accelerator magnets from brittle conductors. HD1 is a single bore block dipole magnet using two, double-layer Nb{sub 3}Sn flat racetrack coils. The magnet was tested in October 2003 and reached a bore peak field of 16 T (94.5% of short sample). The average quench current plateau appeared to be limited by 'stick slip' conductor motions. Diagnostics recorded quench origin… more
Date: June 1, 2005
Creator: Mattafirri, S.; Bartlett, S. E.; Bish, P. A.; Caspi, S.; Dietderich, D. R.; Ferracin, P. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Multi-batch slip stacking in the Main Injector at Fermilab

Description: The Main Injector (MI) at Fermilab is planning to use multi-batch slip stacking scheme in order to increase the proton intensity at the NuMI target by about a factor of 1.5.[1] [2] By using multi-batch slip stacking, a total of 11 Booster batches are merged into 6, 5 double ones and one single. We have successfully demonstrated the multibatch slip stacking in MI and accelerated a record intensity of 4.6E13 particle per cycle to 120 GeV. The technical issues and beam loss mechanisms for multibat… more
Date: June 1, 2007
Creator: Seiya, K.; Berenc, T.; Chase, B.; Dey, J.; Joireman, P.; Kourbanis, I. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Effects of Slip Planes on Stresses in MICE Coupling Solenoid Coil Assembly

Description: The MICE superconducting coupling solenoid magnet is made from copper matrix Nb-Ti conductors with inner radius of 750 mm, length of 285 mm and thickness of 110.4 mm at room temperature. The coil is to be wound on a mandrel made of aluminum. The peak magnetic field on the conductor is about 7.3 T when fully charged at 210 A. High magnetic field and large size make the stress inside the coupling coil assembly relatively high during cool down and full energizing. The shear stress between coil win… more
Date: June 28, 2010
Creator: Wang, Li; Pan, Heng; Wu, Hong; Guo, XingLong; Cheng, Y. & Green, Michael A
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Modeling of coulpled deformation and permeability evolution during fault reactivation induced by deep underground injection of CO2

Description: The interaction between mechanical deformation and fluid flow in fault zones gives rise to a host of coupled hydromechanical processes fundamental to fault instability, induced seismicity, and associated fluid migration. In this paper, we discuss these coupled processes in general and describe three modeling approaches that have been considered to analyze fluid flow and stress coupling in fault-instability processes. First, fault hydromechanical models were tested to investigate fault behavior … more
Date: June 1, 2010
Creator: Cappa, F. & Rutqvist, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Geomechanical Analysis and Design Considerations for Thin-Bedded Salt Caverns: Final Report

Description: The bedded salt formations located throughout the United States are layered and interspersed with non-salt materials such as anhydrite, shale, dolomite and limestone. The salt layers often contain significant impurities. GRI and DOE have initialized this research proposal in order to increase the gas storage capabilities by providing operators with improved geotechnical design and operating guidelines for thin bedded salt caverns. Terralog has summarized the geologic conditions, pressure condit… more
Date: June 15, 2005
Creator: Bruno, Michael S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Increasing Safety and Reducing Environmental Damage Risk from Aging High-Level Radioactive Waste Tanks

Description: There exists a paramount need for improved understanding the behavior of high-level nuclear waste containers and the impact on structural integrity in terms of leak tightness and mechanical stability. The current program aims to develop and verify models of crack growth in high level waste tanks under accidental overloads such as ground settlement, earthquakes and airplane crashes based on extending current fracture mechanics methods. While studies in fracture have advanced, the mechanics have … more
Date: June 1, 2003
Creator: Steffler, Eric D.; McClintock, Frank A.; Lam, Poh-Sang; Williamson, Richard L.; Lloyd, W. R. & Rashid, Mark M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Barrier RF stacking at Fermilab

Description: A key issue to upgrade the luminosity of the Tevatron Run2 program and to meet the neutrino requirement of the NuMI experiment at Fermilab is to increase the proton intensity on the target. This paper introduces a new scheme to double the number of protons from the Main Injector (MI) to the pbar production target (Run2) and to the pion production target (NuMI). It is based on the fact that the MI momentum acceptance is about a factor of four larger than the momentum spread of the Booster beam. … more
Date: June 4, 2003
Creator: al., Weiren Chou et
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Slip stacking experiments at Fermilab main injector

Description: In order to achieve an increase in proton intensity, Fermilab Main Injector will use a stacking process called ''slip stacking''. The intensity will be doubled by injecting one train of bunches at a slightly lower energy, another at a slightly higher energy, then bringing them together for the final capture. Beam studies have started for this process and we have already verified that, at least for a low beam intensity, the stacking procedure works as expected. For high intensity operation, deve… more
Date: June 2, 2003
Creator: al., Kiyomi Koba et
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Increasing Safety and Reducing Environmental Damage Risk from Aging High-Level Radioactive Waste Tanks

Description: There exists a paramount need for improved understanding the behavior of high-level nuclear waste containers and the impact on structural integrity in terms of leak tightness and mechanical stability. The current program, which at the time of this writing is in its early stages, aims to develop and verify models of crack growth in high level waste tanks under accidental overloads such as ground settlement, earthquakes and airplane crashes based on extending current fracture mechanics methods. W… more
Date: June 1, 2002
Creator: Steffler, Eric D.; McClintock, Frank A.; Lam, Poh-Sang & Lloyd, W. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Study of Factors Influencing Ductility of Iron-Aluminum Alloys. Interim Report

Description: An analyers of the basic slip mechanism of several aluminum--iron alloys containing 8 to 16% aluminium indicated a crystallographic typs slip on the {110} planes. The effects of order-disorder heat-treatment variables, scavenging additions, and processing precedures were investigated. Plastic flow and fracture mechanisms in aluminum --iron alloys were investigated as a function of aluminum content. The degree of atomic orderirg in aluminum -iron alloys was studied by means of electrical resisti… more
Date: June 1, 1960
Creator: Rauscher, G.; Perkins, F. C. & Nachman, J. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Mechanisms of flow through compressible porous beds in sedimentation, filtration, centrifugation, deliquoring, and ceramic processing

Description: The University of Houston research program is aimed at the specific area of solid/liquid separation including sedimentation, thickening, cake filtration, centrifugation, expression, washing, deep-bed filtration, screening, and membrane separation. Unification of the theoretical approaches to the various solid/liquid separation operations is the principle objective of the research. Exploring new aspects of basic separation mechanisms, verification of theory with experiment, development of labora… more
Date: June 1, 1992
Creator: Tiller, Frank M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Potential for Induced Seismicity Related to the Northern California CO2 Reduction Project Pilot Test, Solano County, California

Description: The objective of this technical report is to analyze the potential for induced seismicity due to a proposed small-scale CO{sub 2} injection project in the Montezuma Hills. We reviewed currently available public information, including 32 years of recorded seismic events, locations of mapped faults, and estimates of the stress state of the region. We also reviewed proprietary geological information acquired by Shell, including seismic reflection imaging in the area, and found that the data and in… more
Date: June 15, 2010
Creator: Myer, L.; Chiaramonte, L.; Daley, T. M.; Wilson, D.; Foxall, W. & Beyer, J. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Optimization of the gelcasting of a silicon nitride formulation

Description: An optimum gelcasting condition for a silicon nitride formulation was determined using the Taguchi statistical method. An L{sub 8}(4{sup 1} {times} 2{sup 4}) design, in which the effects of one factor at four levels and four factors at two levels were evaluated in only eight experiments, was used. The factors at two levels were: the total monomer concentration, the monomer/crosslinker ratio, the initiator concentration, and the initiator/catalyst ratio; the factor at four levels was the initiat… more
Date: June 1, 1995
Creator: Omatete, O.O.; Pollinger, J.P. & O`Young, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Slip, twinning, and transformation in Laves phases. Final technical report, 1 August 1990--January 31, 1997

Description: Currently, intermetallic compounds are being studied as potential high-temperature structural materials. Most of these studies are on phases such as Ni{sub 3}Al, TiAl, NiAl, and Ti{sub 3}Al, which have structures that are crystallographic derivatives of fcc, bcc, or hcp structures. However, most intermetallics have more complex crystal structures, and little is known about their deformation mechanisms and mechanical properties. By far the largest class of such compounds is that of the Laves pha… more
Date: June 1, 1998
Creator: Allen, S.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Microstructure and momentum transport in concentrated suspensions

Description: This paper reviews several coupled theoretical and experimental investigations of the effect of microstructure on momentum transport in concentrated suspensions. An expression to predict the apparent suspension viscosity of mixtures of rods and spheres is developed and verified with falling-ball viscometry experiments. The effects of suspension-scale slip (relative to the bulk continuum) are studied with a sensitive spinning-ball rheometer, and the results are explained with a novel theoretical… more
Date: June 1996
Creator: Mondy, L. A.; Graham, A. L. & Brenner, H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Crystallographic Considerations of the Delta in Equilibrium. cap alpha. Displacive Transformation in Plutonium Alloys

Description: Determination of invariant-plane strain crystallographic solutions for martensitic transformation between the FCC delta and monoclinic ..cap alpha.. phases in plutonium alloys, using three possible lattice correspondences and 53 possible lattice-invariant shear systems, identifies the most probable delta-..cap alpha.. lattice correspondence. The operative lattice-invariant shear systems are predicted by comparison of both shape strain magnitudes and computed interfacial energies. For delta ..--… more
Date: June 10, 1986
Creator: Adler, P. H. & Olson, G. B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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