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Low Temperature and High Pressure Evaluation of Insulated Pressure Vessels for Cryogenic Hydrogen Storage
Insulated pressure vessels are cryogenic-capable pressure vessels that can be fueled with liquid hydrogen (LH{sub 2}) or ambient-temperature compressed hydrogen (CH{sub 2}). Insulated pressure vessels offer the advantages of liquid hydrogen tanks (low weight and volume), with reduced disadvantages (fuel flexibility, lower energy requirement for hydrogen liquefaction and reduced evaporative losses). The work described here is directed at verifying that commercially available pressure vessels can be safely used to store liquid hydrogen. The use of commercially available pressure vessels significantly reduces the cost and complexity of the insulated pressure vessel development effort. This paper describes a series of tests that have been done with aluminum-lined, fiber-wrapped vessels to evaluate the damage caused by low temperature operation. All analysis and experiments to date indicate that no significant damage has resulted. Required future tests are described that will prove that no technical barriers exist to the safe use of aluminum-fiber vessels at cryogenic temperatures.
Date:
June 25, 2000
Creator:
Aceves, S.; Martinez-Frias, J. & Garcia-Villazana, O.
Object Type:
Article
System:
The UNT Digital Library
The Alabama School Prayer Case: Chandler v. Siegelman
This report considers the events of Chandler v. James in 1997. The case was a federal district court ruling in Alabama holding up a statute to violate the establishment of religion of the First amendment. The Governor attempted to appeal the court's position to both the Supreme Court and the circuit court but was denied.
Date:
June 25, 2001
Creator:
Ackerman, David M.
Object Type:
Report
System:
The UNT Digital Library
The Religious Freedom Restoration Act: Its Rise, Fall, and Current Status
This report briefly summarizes Employment Division, Oregon Department of Human Resources v. Smith, the legislative history of the Religious Freedom Restoration Act (RFRA), the Supreme Court's decision in City of Boerne, Texas v. Flores, and RFRA's current legal status, and notes the introduction of the Religious Liberty Protection Act (RLPA).
Date:
June 25, 1998
Creator:
Ackerman, David M.
Object Type:
Report
System:
The UNT Digital Library
Development and Testing of the NIF Prototype Module
The NIF Power Conditioning System (PCS) is required to deliver -68 kJ to each of the 3840 flashlamp pairs in the NIF laser in a current pulse with a peak of -500 kA and rise time of- 150 µs. The PCS will consist of 192 modules each of which drive 20 lamp-pairs. Each module will basically be a 6 rnF capacitor bank with a nominal charge voltage of 23.5 kV which is switched by a single pressurized air gas switch to 20 RG-220 cables that are connected to individual lamp loads. In addition each module will have a number of subsystems including; a lamp pre-ionization system, power supplies, isolation circuits, trigger systems, safety dump systems, gas system, and an embedded control system. A module will also include components whose primary function is to limit fault currents and thus minimize collateral damage in faults. In the Prototype Development and Testing effort at Sandia National Laboratories all of these were integrated into a single system and proper fimctionality was demonstrated. Extensive testing was done at nominal operating levels into resistive dummy loads and some testing in fault modes was also done. A description of the system and a summary of testing is …
Date:
June 25, 1999
Creator:
Adcock, J.; Harjes, C.; Mowrer, G. & Wilson, M.
Object Type:
Article
System:
The UNT Digital Library
Design and Performance of the Matching Beamline Between the Bnl Ebis and an Rfq.
A part of a new EBIS-based heavy ion preinjector, the low energy beam transport (LEBT) section between the high current EBIS and the RFQ is a challenging design, because it must serve many functions. In addition to the requirement to provide an efficient matching between the EBIS and the RFQ, this line must serve as a fast ''switchyard'', allowing singly charged ions from external sources to be transported into the EBIS trap region, and extracted, highly charged ions to be deflected to off-axis diagnostics (time-of-flight or emittance). The space charge of the 5-10 mA extracted heavy ion beam is a major consideration in the design, and the space charge force varies for different ion beams having Q/m from 1-0.16. The line includes electrostatic lenses, spherical and parallel-plate deflectors, magnetic solenoid, and diagnostics for measuring current, charge state distributions, emittance, and profile. A prototype of this beamline has been built, and results of tests are presented.
Date:
June 25, 2007
Creator:
Alessi, J.; Beebe, E.; Brodowski, J.; Kponou, A.; Okamura, M.; Pikin, A. et al.
Object Type:
Article
System:
The UNT Digital Library
High Performance Ebis for Rhic.
An Electron Beam Ion Source (EBIS), capable of producing high charge states and high beam currents of any heavy ion species in short pulses, is ideally suited for injection into a synchrotron. An EBIS-based, high current, heavy ion preinjector is now being built at Brookhaven to provide increased capabilities for the Relativistic Heavy Ion Collider (RHIC), and the NASA Space Radiation Laboratory (NSRL). Benefits of the new preinjector include the ability to produce ions of any species, fast switching between species to serve the simultaneous needs of multiple programs, and lower operating and maintenance costs. A state-of-the-art EBIS, operating with an electron beam current of up to 10 A, and producing multi-milliamperes of high charge state heavy ions, has been developed at Brookhaven, and has been operating very successfully on a test bench for several years. The present performance of this high-current EBIS is presented, along with details of the design of the scaled-up EBIS for RHIC, and the status of its construction. Other aspects of the project, including design and construction of the heavy ion RFQ, Linac, and matching beamlines, are also mentioned.
Date:
June 25, 2007
Creator:
Alessi, J.; Beebe, E.; Gould, O.; Kponou, A.; Lockey, R.; Pikin, A. et al.
Object Type:
Article
System:
The UNT Digital Library
Design and Performance of the Matching Beamline Between the BNL EBIS and an RFQ.
This report addresses the design and performance of the matching beamline between the BNL EBIS and an RFQ.
Date:
June 25, 2007
Creator:
Alessi,J.; Beebe, E.; Brodowski, J.; Kponou, A.; Okamura, M.; Pikin, A. et al.
Object Type:
Article
System:
The UNT Digital Library
Observation of ionization instability of intense laser pulses
Theoretical analysis and preliminary experiment on ionization instability of intense laser pulses in ionizing plasmas are presented. The ionization instability is due to the dependence of the ionization rate on the laser intensity and scatters the laser energy off the original propagation direction.
Date:
June 25, 1999
Creator:
Alexeev, I.; Antonsen, T. M.; Li, Y.; Milchberg, H. M. & Nikitin, S.
Object Type:
Article
System:
The UNT Digital Library
Final report [The 15th Workshop on Electromagnetic Induction in the Earth, held 8/20-26/2000, and The 5th Magnetotelluric Data Interpretation Workshop, 8/17-19/2000]
This document reports on how the DOE helped to support travel of students and scientists to the conferences in Brazil. Attendee names, funding, and session titles are listed.
Date:
June 25, 2002
Creator:
Alumbaugh, David L.
Object Type:
Report
System:
The UNT Digital Library
Simplified modeling of the EBR-II control rods
Simplified models of EBR-II control and safety rods have been developed for core modeling under various operational and shutdown conditions. A parametric study was performed on normal worth, high worth, and safety rod type control rods. A summary of worth changes due to individual modeling approximations is tabulated. Worth effects due to structural modeling simplification are negligible. Fuel region homogenization and burnup compression contributes more than any other factor. Reference case C/E values (ratio of calculated worth from detailed model to measured worth) of 1.072 and 1.142 for safety and normal worth rods indicate acceptable errors when the approximations are used. Fuel burnup effect illustrates rod worth sensitivity to the modeling approximation. Aggregate effects are calculated under a reduced mesh.
Date:
June 25, 1995
Creator:
Angelo, P.L.
Object Type:
Article
System:
The UNT Digital Library
Harrow
Patent for a harrow designed to cultivate only one row of crops at a time. Illustrations included.
Date:
June 25, 1907
Creator:
Arnold, Jesse E.
Object Type:
Patent
System:
The Portal to Texas History
Measurement of the light quark flavor asymmetry in the nucleon sea.
Fermilab experiment E866 has performed a precision measurement of the ratio of Drell-Yan yields from 800 GeV/c protons incident on deuterium and hydrogen targets. The measurement is used to determine the ratio of down antiquarks({bar d}) to up antiquarks({bar u}) in the proton over a broad range in the fraction of the proton momentum carried by the antiquark, 0.02 < x < 0.345. For x < 0.15, the data is in reasonable agreement with pre-existing parton distributions while for x > 0.20 the data is much closer to unity than these parton functions had indicated. The light quark asymmetry provides valuable information on the relative role perturbative and non-perturbative mechanisms play in generating the nucleon sea. A proposal to extend the Drell-Yan measurement to higher values of x using 120 GeV protons from the Fermilab main injector will be discussed.
Date:
June 25, 1999
Creator:
Awes, T. C.; Beddo, M. E.; Brown, C. N.; Bush, J. D.; Collaboration, FNAL E866 /NuSea; Geesaman, D. F. et al.
Object Type:
Article
System:
The UNT Digital Library
THE POINCARE MAP, LIE GENERATOR, NONLINEAR INVARIANT, PARAMETER DEPENDANCE, AND DYNAMIC APERTURE FOR RINGS.
In earlier work related to the NSLS-II project we have outlined a control theory approach for the dynamic aperture problem. In particular, an algorithm for the joint optimization of the Lie generator and the working point for the Poincare map. This time we report on how the Lie generator provides guidelines on acceptable magnitudes for e.g. the intrinsic nonlinear effects from insertion devices, and the nonlinear pseudo-invariant from the map normal form can be used to optimize the dynamic aperture. We also show how a polymorphic beam line class can be used to study the parameter dependence and rank conditions for control of optics and dynamic aperture.
Date:
June 25, 2007
Creator:
BENGTSSON,J.
Object Type:
Article
System:
The UNT Digital Library
OVERVIEW OF THE AGS COLD SNAKE POWER SUPPLIES AND THE NEW RHIC SEXTUPOLE POWER SUPPLIES
The two rings in the Relativistic Heavy Ion Collider (RHIC) were originally constructed with 24 sextupole power supplies, 12 for each ring. Before the start of Run 7, 24 new sextupole power supplies were installed, 12 for each ring. Individual sextupole power supplies are now each connected to six sextupole magnets. A superconducting snake magnet and power supplies were installed in the Alternating Gradient Synchrotron (AGS) and commissioned during RHIC Run 5, and used operationally in RHIC Run 6. The power supply technology, connections, control systems and interfacing with the Quench Protection system for both these systems will be presented.
Date:
June 25, 2007
Creator:
BRUNO,D.; GANETIS, G.; SANDBERG, J. & LOUIE, W.
Object Type:
Article
System:
The UNT Digital Library
RHIC POWER SUPPLIES-FAILURE STATISTICS FOR RUNS 4, 5, AND 6
The two rings in the Relativistic Heavy Ion Collider (RFIIC) require a total of 933 power supplies to supply current to highly inductive superconducting magnets. Failure statistics for the RHIC power supplies will be failure associated with the CEPS group's responsibilities. presented for the last three RHIC runs. The failures of the power supplies will be analyzed. The statistics associated with the power supply failures will be presented. Comparisons of the failure statistics for the last three RHIC runs will be shown. Improvements that have increased power supply availability will be discussed.
Date:
June 25, 2007
Creator:
BRUNO,D.; GANETIS, G.; SANDBERG, J.; LOUIE, W.; HEPPNER, G. & SCHULTHEISS, C.
Object Type:
Article
System:
The UNT Digital Library
RHIC Spin Flipper
This paper proposes a new design of spin flipper for RHIC to obtain full spin flip with the spin tune staying at half integer. The traditional technique of using an rf dipole or solenoid as spin flipper to achieve full spin flip in the presence of full Siberian snake requires one to change the snake configuration to move the spin tune away from half integer. This is not practical for an operational high energy polarized proton collider like RHIC where beam lifetime is sensitive to small betatron tune change. The design of the new spin flipper as well as numerical simulations are presented.
Date:
June 25, 2007
Creator:
Bai, M. & Roser, T.
Object Type:
Article
System:
The UNT Digital Library
Accelerating Polarized Protons to 250 GEV
The Relativistic Heavy Ion Collider (RHIC) as the first high energy polarized proton collider was designed t o provide polarized proton collisions a t a maximum beam energy of 250 GeV. I t has been providing collisions a t a beam energy of 100 Gel' since 2001. Equipped with two full Siberian snakes in each ring, polarization is preserved during the acceleration from injection to 100 GeV with careful control of the betatron tunes and the vertical orbit distortions. However, the intrinsic spin resonances beyond 100 GeV are about a factor of two stronger than those below 100 GeV? making it important t o examine the impact of these strong intrinsic spin resonances on polarization survival and the tolerance for vertical orbit distortions. Polarized protons were accelerated t o the record energy of 250 GeV in RHIC with a polarization of 46% measured a t top energy in 2006. The polarization measurement as a function of beam energy also shows some polarization loss around 136 GeV, the first strong intrinsic resonance above 100 GeV. This paper presents the results and discusses the sensitivity of the polarization survival t o orbit distortions.
Date:
June 25, 2007
Creator:
Bai, M.; Ahrens, L.; Alekseev, I. G.; Alessi, J.; Beebe-Wang, J. & AL., ET
Object Type:
Article
System:
The UNT Digital Library
Snake Deplorizing Resonance Study in RHIC
Snake depolarizing resonances due to the imperfect cancellation of the accumulated perturbations on the spin precession between snakes were observed at the Relativistic Heavy Ion Collider (RHIC). During the RHIC 2005 and 2006 polarized proton runs, we mapped out the spectrum of odd order snake resonance at Q{sub y} = 7/10. Here, Q, is the beam vertical betatron tune. We also studied the beam polarization after crossing the 7/10th resonance as a function of resonance crossing rate. This paper reports the measured resonance spectrum as well as the results of resonance crossing.
Date:
June 25, 2007
Creator:
Bai, M.; Cameron, P.; Luccio, A.; Huang, H.; Pitisyn, V. & AL., ET
Object Type:
Article
System:
The UNT Digital Library
Advances in the theory of box integrals
Box integrals - expectations <|{rvec r}|{sup s}> or <|{rvec r}-{rvec q}|{sup s}> over the unit n-cube (or n-box) - have over three decades been occasionally given closed forms for isolated n,s. By employing experimental mathematics together with a new, global analytic strategy, we prove that for n {le} 4 dimensions the box integrals are for any integer s hypergeometrically closed in a sense we clarify herein. For n = 5 dimensions, we show that a single unresolved integral we call K{sub 5} stands in the way of such hyperclosure proofs. We supply a compendium of exemplary closed forms that naturally arise algorithmically from this theory.
Date:
June 25, 2009
Creator:
Bailey, David H.; Borwein, J. M. & Crandall, R. E.
Object Type:
Report
System:
The UNT Digital Library
Properites of ultrathin films appropriate for optics capping layers in extreme ultraviolet lithography (EUVL)
The contamination of optical surfaces by irradiation shortens optics lifetime and is one of the main concerns for optics used in conjunction with intense light sources, such as high power lasers, 3rd and 4th generation synchrotron sources or plasma sources used in extreme ultraviolet lithography (EUVL) tools. This paper focuses on properties and surface chemistry of different materials, which as thin layers, could be used as capping layers to protect and extend EUVL optics lifetime. The most promising candidates include single element materials such as ruthenium and rhodium, and oxides such as TiO{sub 2} and ZrO{sub 2}.
Date:
June 25, 2007
Creator:
Bajt, S; Edwards, N V & Madey, T E
Object Type:
Article
System:
The UNT Digital Library
Carbon Nanotube Based Microfluidic Elements for Filtration and Concentration
We have developed a method for integration of patterned arrays of carbon nanotubes or the ''nanotube mesh'' into microfabricated channels. The method includes standard lithographic methods for patterning and etching the substrate, followed by catalyst patterning, CVD deposition of nanotubes, and anodic bonding of coverslip top. We will describe a carbon nanotube filtering device fabricated using this method and discuss the use of carbon nanotube arrays as molecular concentration and separation media.
Date:
June 25, 2003
Creator:
Bakajin, O; Ben-Barak, N; Peng, J & Noy, A
Object Type:
Article
System:
The UNT Digital Library
Markov Model of Severe Accident Progression and Management
The earthquake and tsunami that hit the nuclear power plants at the Fukushima Daiichi site in March 2011 led to extensive fuel damage, including possible fuel melting, slumping, and relocation at the affected reactors. A so-called feed-and-bleed mode of reactor cooling was initially established to remove decay heat. The plan was to eventually switch over to a recirculation cooling system. Failure of feed and bleed was a possibility during the interim period. Furthermore, even if recirculation was established, there was a possibility of its subsequent failure. Decay heat has to be sufficiently removed to prevent further core degradation. To understand the possible evolution of the accident conditions and to have a tool for potential future hypothetical evaluations of accidents at other nuclear facilities, a Markov model of the state of the reactors was constructed in the immediate aftermath of the accident and was executed under different assumptions of potential future challenges. This work was performed at the request of the U.S. Department of Energy to explore 'what-if' scenarios in the immediate aftermath of the accident. The work began in mid-March and continued until mid-May 2011. The analysis had the following goals: (1) To provide an overall framework for describing possible …
Date:
June 25, 2012
Creator:
Bari, R. A.; Cheng, L.; Cuadra, A.; Ginsberg, T.; Lehner, J.; Martinez-Guridi, G. et al.
Object Type:
Article
System:
The UNT Digital Library
Static Corrosion Tests of Fabrication Material for D-12 Waste Evaporator
Three types of stainless steel (309 SCB, Carpenter 20, 304-L) were exposed to both the liquid and vapor phase of each of three types of solutions. The time of exposure totaled ten days during which the specimens were cleaned and weighed periodically. The three synthetic D-12 waste solutions contained respectively chrome-high chloride, chrome-low chloride and high chloride sans chromium. The solutions were renewed at each weighing.
Date:
June 25, 1953
Creator:
Barnes, R. G.
Object Type:
Report
System:
The UNT Digital Library
Rapid-Transit Car
Patent for a rapid transit car that runs on cables in the air.
Date:
June 25, 1912
Creator:
Barnett, John B.
Object Type:
Patent
System:
The Portal to Texas History