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Lattice for a low-field superconducting super collider
In this paper I present a simple lattice suitable for a Superconducting Super Collider (super-super). This super-super lattice is designed for storage of 20-TeV protons using bending magnets with peak fields of B = 2.1 T. The low-field value is chosen so that the present work may complement presentations of highfield lattices (5 T and 6.5 T) given elsewhere at this workshop, and so that this lattice may be used as a working tool to identify field-dependent aspects of the accelerator design.
Date:
January 1, 1983
Creator:
Neuffer, D.
Object Type:
Article
System:
The UNT Digital Library
Radiation-induced electrical breakdown of helium in fusion reactor superconducting magnet systems
A comprehensive theoretical study has been performed on the reduction of the electrical breakdown potential of liquid and gaseous helium under neutron and gamma radiation. Extension of the conventional Townsend breakdown theory indicates that radiation fields at the superconducting magnets of a typical fusion reactor are potentially capable of significantly reducing currently established (i.e., unirradiated) helium breakdown voltages. Emphasis is given to the implications of these results including future deployment choices of magnet cryogenic methods (e.g., pool-boiling versus forced-flow), the possible impact on magnet shielding requirements and the analogous situation for radiation-induced electrical breakdown in fusion RF transmission systems.
Date:
December 2, 1983
Creator:
Perkins, L.J.
Object Type:
Article
System:
The UNT Digital Library
Analysis of Sweet Lake geopressured-geothermal aquifer
The Sweet Lake geopressured-geothermal aquifer, located southeast of Lake Charles, Louisiana, is an aquifer modeled by a two-dimensional geopressured-geothermal simulator. This aquifer is a sandstone within the Frio formation at depths between 15,000 to 15,640 ft with a net porous thickness of 250 ft, a calculated in-situ permeability (from drawdown data) of 17 md, an estimated porosity of 24 percent, a uniaxial compaction coefficient of 4.5 x 10/sup -7/ psi/sup -1/ and a solution gas-water ratio of 11 SCF/STB all at the initial reservoir pressure of 12,060 psi. These parameters are typically pressure sensitive in geopressured-geothermal aquifers and are critically important to aquifer performance. Several simulation experiments are conducted which investigate the effects of varying initial values for these parameters with the experimentally determined values as means. The simulations give both optimistic and pessimistic expectations for aquifer performance. The expected life of the geopressured-geothermal well is reported for each simulation.
Date:
January 1, 1983
Creator:
Andrade, M.; Rago, F. M.; Ohkuma, H.; Sepehrnoori, K.; Peters, E. & Dorfman, M.
Object Type:
Report
System:
The UNT Digital Library
Calculation of density profiles in tandem mirrors fueled by pellets
We have modified the LLNL radial transport code TMT to model reactor regime plasmas, fueled by pellets. The source profiles arising from pellet fueling are obtained from existing pellet ablation models. Because inward radial diffusion due to inverted profiles must compete with trapping of central cell ions in the transition region for tandem mirrors, pellets must penetrate fairly far into the plasma. In fact, based on our radial calculations, a pellet with a velocity of 10 km/sec cannot sustain the central flux tubes; a velocity more like 100 km/sec will be necessary. We also find that the central cell radial diffusion must exceed classical by about a factor of 100.
Date:
December 2, 1983
Creator:
Campbell, R. B. & Gilmore, J. M.
Object Type:
Article
System:
The UNT Digital Library
Recent Results From DELCO
DELCO is a magnetic spectrometer with Cerenkoc, Time-of-Flight (TOF) and shower counters for particle identification. It is located in IR8 of the PEP storage ring. Data have been obtained at a center of mass energy, ..sqrt..s, of 29 GeV. We report on: (1) the fraction of P, K, ..pi.. in hadronic events; (2) the observation of direct electron signals; and (3) the measurement of D* fragmentation function and its total cross-section. 8 references.
Date:
November 1, 1983
Creator:
Atwood, W. B.; Baillon, P. H.; Barish, B. C.; Bonneaud, G. R.; DeStaebler, H.; Donaldson, G. J. et al.
Object Type:
Report
System:
The UNT Digital Library
Answers to questions about updated estimates of occupational radiation doses at Three Mile Island, Unit 2
The purpose of this question and answer report is to provide a clear, easy-to-understand explanation of revised radiation dose estimates which workers are likely to receive over the course of the cleanup at Three Mile Island, Unit 2, and of the possible health consequences to workers of these new estimates. We will focus primarily on occupational dose, although pertinent questions about public health and safety will also be answered.
Date:
December 1, 1983
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Effects of pulsed and/or dual ion irradiation on microstructural evolution in a Ti and Si modified austenitic alloy
The influence of pulsed 4 MeV Ni-ion bombardment, with and without simultaneous helium injection, at 958 K and damage levels from 1 to 50 dpa has been studied in a low swelling, Ti- and Si- modified austenitic stainless steel. Compared to continuous irradiation, pulsing caused an increase in the number density of interstitial loops formed during irradiation. Helium also increased the nucleation of interstitial loops. The main precipitates formed were a large number of small TiC particles uniformly distributed in the matrix, and a small number of relatively large eta and G precipitates. These course precipitates were somewhat larger in the pulsed specimens. Pulsing appeared to produce no significant change in swelling compared to continuous irradiation. However, for one specimen irradiated to 54 dpa, pulsing concurrent with substantial temperature fluctuations caused by beam heating may have been responsible for a larger swelling compared to continuous irradiation.
Date:
January 1, 1983
Creator:
Hishinuma, A.; Packan, N. H.; Lee, E. H. & Mansur, L. K.
Object Type:
Article
System:
The UNT Digital Library
Improving the energy efficiency of residential clothes dryers
An experimental study on energy efficient electrical domestic clothes dryers is presented. A literature survey was performed and four basic energy saving techniques were identified: (1) reduced air flow rate and heater input, (2) recirculation of a portion of the exhaust air back into the clothes dryer, (3) heat recovery, utilizing an air-to-air heat exchanger, and (4) 100% recirculation of air through the dryer and a heat pump to condense water out of the air. Reduced air flow rate and heater input leads to energy savings around 8%, while recirculation of exhaust air reduces the energy consumption by approximately 18%. Because of the low cost of these two measures, they should be pursued by the manufacturers. When utilizing an air-to-air heat exchanger for heat recovery, two modes are considered. The first is to preheat the inlet air with heat from the exhaust air, which results in 20 to 26% energy savings depending upon the location of the dryer in the house. The second more attractive mode is 100% recirculation of air and condensation of water from this air in the heat exchanger (using indoor air as a heat sink) and represents a 100% heat recovery but leads to a 1 …
Date:
July 1, 1983
Creator:
Hekmat, D. & Fisk, W.J.
Object Type:
Report
System:
The UNT Digital Library
Salt repository design approach
This paper presents a summary discussion of the approaches that have been and will be taken in design of repository facilities for use with disposal of radioactive wastes in salt formations. Since specific sites have yet to be identified, the discussion is at a general level, supplemented with illustrative examples where appropriate. 5 references, 1 figure.
Date:
January 1, 1983
Creator:
Matthews, S.C.
Object Type:
Article
System:
The UNT Digital Library
Neutron therapy facility at the Institute of High Energy Physics, Academia Sinica
The 10 MeV proton linac which was designed as preinjector for the Beijing 50 GeV Proton Synchrotron (BPS) was completed by the end of 1982. Because of the economic readjustment in the People's Republic of China the BPS project was cancelled. Then, the Institute of High Energy Physics decided to increase the energy of the linac from 10 MeV to 35.5 MeV. This increase will take place using the primary five megawatts RF system of the 10 MeV linac. This 35.5 MeV proton linac will be used for research in radiomedicine and radiobiology in general and in particular for research in fast neutron therapy and radiopharmaceutical production. This project has been approved by the Academia Sinica.
Date:
December 1, 1983
Creator:
Zhu, Y.C.
Object Type:
Report
System:
The UNT Digital Library
Field testing of fugitive dust control techniques at a uranium mill tailings pile - 1982 Field Test, Gas Hills, Wyoming.
A field test was conducted on a uranium tailings pile to evaluate the effectiveness of 15 chemical stabilizers for control of fugitive dust from uranium mill tailings. A tailings pile at the Federal American Partners (FAP) Uranium Mill, Gas Hills, Wyoming, was used for the field test. Preliminary laboratory tests using a wing tunnel were conducted to select the more promising stabilizers for field testing. Fourteen of the chemical stabilizers were applied with a field spray system pulled behind a tractor; one--Hydro Mulch--was applied with a hydroseeder. A portable weather station and data logger were installed to record the weather conditions at the test site. After 1 year of monitoring (including three site visits), all of the stabilizers have degraded to some degree; but those applied at the manufacturers' recommended rate are still somewhat effective in reducing fugitive emissions. The following synthetic polymer emulsions appear to be the more effective stabilizers: Wallpol 40-133 from Reichold Chemicals, SP-400 from Johnson and March Corporation, and CPB-12 from Wen Don Corporation. Installed costs for the test plots ranged from $8400 to $11,300/ha; this range results from differences in stabilizer costs. Large-scale stabilization costs of the test materials are expected to range from $680 …
Date:
December 1, 1983
Creator:
Elmore, M.R. & Hartley, J.N.
Object Type:
Report
System:
The UNT Digital Library
Tritium related safety considerations for mirror upgrades
One of the primary objectives of the MFTF-B upgrades is to demonstrate the technology of tritium breeding in a reactor-like configuration. This requires use and processing of tritium, involving an inventory of several hundred grams at the plant. This paper reviews the results of a preliminary assessment of the radiation hazard associated with the handling of tritium. The radiation dose consequences due to tritium release from normal operation and due to postulated accidents on plant personnel and the public were assessed. Maximum credible (probability < 10/sup -3/, but > 10/sup -7//yr) accidental releases were estimated to be 10 gm in the reactor building and 100 gm in the tritium-processing building. Higher probability (> 10/sup -3//yr) accidents or component failures would result in much smaller releases. In the reactor building, the most severe accident would result from the rupture of a plasma exhaust duct from the end cell or the tritium feed pipe to the neutral beam injector, accompanied by a fire. In the tritium processing building, the most severe accident would be the rupture of the Isotope Separation System (ISS) distillation columns and vacuum jackets accompanied by a fire.
Date:
November 30, 1983
Creator:
Ghose, S.K.
Object Type:
Article
System:
The UNT Digital Library
Status of greater than or equal to 1 ampere H/sup -/ ion source development at the Lawrence Berkeley Laboratory
This paper summarizes the effort to improve the operation of the approx. 1 A surface-production H/sup -/ ion source developed by K.W. Ehlers and K.N. Leung. The plasma chamber consists of a large magnetic bucket of oval cross section. A concave cylindrical converter surface is suspended in the plasma chamber to direct any surface-produced negative ions through the exit aperture. The ion source has been mated to a tetrode accelerator for the proof-of-principle tests. Most of the problems discovered in the tests were associated with difficulties in controlling the production process. This paper describes the plasma chamber in greater detail and illustrates the quality of the presnet ion production. The acceleration difficulties have been deferred until a better test-stand is completed.
Date:
November 1, 1983
Creator:
Lietzke, A. F.; Ehlers, K. W. & Leung, K. N.
Object Type:
Article
System:
The UNT Digital Library
First wall and limiter lifetime in pulsed tokamak reactors
This study concentrates on the structural integrity of certain reactor subsystems under cyclic operation to answer the question: how long a burn pulse is needed to achieve the benefits of steady-state operation. Component lifetime in the steady-state is limited by three effects: radiation damage, disruptions, and sputtering erosion. Cyclic operation modifies one of these (the number of disruptions may increase with the number of burn cycles) and introduces a fourth life limit, thermal fatigue. Our design strategy is to determine the structure and coating thicknesses which maximize component lifetime against all life limitations. After calculating disruption damage (vaporization, melting) for candidate materials we present the lifetime analysis for different structures.
Date:
December 1, 1983
Creator:
Ehst, D.; Majumdar, S.; Cha, Y. & Hassanein, A.
Object Type:
Article
System:
The UNT Digital Library
Technical specifications - enhancing the safety impact
This report documents the work of an interoffice, interdisciplinary, NRC Task Group established in August 1983 to identify the scope and nature of problems with surveillance testing in current Technical Specifications and to develop alternative approaches that will provide better assurance that surveillance testing does not adversely impact safety. The Task Group concluded that some of the Technical Specifications have the potential for adversely affecting safety and some do not appear to be cost effective. The Task Group developed five recommendations for improvement. 15 references.
Date:
November 1, 1983
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Database transfers between several systems. [FRAMIS and DATATRIEVE]
The ability to transfer databases between systems allows the user to exploit the best features of either system. This paper addresses beginning Datatrieve users and deals with the issues involved in a transfer of a database from a central computing area to a PDP-11 at the Los Alamos National Laboratory. FRAMIS was used to clean the original database; DATATRIEVE was used to establish the new database. The new database residing on the PDP-11 was subject to structural change at any time.
Date:
January 1, 1983
Creator:
Doll, M.
Object Type:
Article
System:
The UNT Digital Library
Quality assurance of PTS thermal hydraulic calculations at BNL. [Pressurized Thermal Shock]
Rapid cooling of the reactor pressure vessel at high pressure has a potential of challenging the vessel integrity. This phenomenon is called overcooling or Pressurized Thermal Shock (PTS). The Nuclear Regulatory Commission (NRC) has selected three plants representing three types of PWRs in use for detailed PTS study. Oconee-1 (B and W), Calvert Cliffs (C.E.), and H.B. Robinson (Westinghouse). The Brookhaven National Laboratory (BNL) has been requested by NRC to review and compare the input decks developed at LANL and INEL, and to compare and explain the differences between the common calculations performed at these two laboratories. However, for the transients that will be computed by only one laboratory, a consistency check will be performed. So far only Oconee-1 calculations have been reviewed at BNL, and the results are presented here.
Date:
January 1, 1983
Creator:
Rohatgi, U.S.; Pu, J.; Jo, J. & Saha, P.
Object Type:
Article
System:
The UNT Digital Library
Supersymmetric statistical models on the lattice
SUSY models in statistical mechanics involve spinless fermions and form an ideal laboratory for latticization. Extension of SUSY relations to the lattice may clarify, as well, the question of their validity beyond perturbation theory. A non-linear approach to lattice SUSY is introduced by the assignment of coupled commuting and anticommuting variables to each lattice site. As a typical example we demonstrate a SUSY dimer Hamiltonian which generates lattice branched-polymers configurations. We suggest a new SUSY model whose configurations are generated by the Ising super-Hamiltonian. These configurations cannot be simply related to the high temperature expansion of the random-field Ising model. The critical behavior of the random-field model is probably in the non-perturbative regime with thermal fluctuations squeezed into anti d-dimensional manifolds in the boundaries of frozen domains. Self-consistent dimensional reduction yields anti d = (d + 1/nu)/2 if ..cap alpha.. < 0 and anti d = d - 1/nu if ..cap alpha.. > 0. This may be explained in terms of anomalous anticommuting dimensions. 18 references.
Date:
January 1, 1983
Creator:
Shapir, Y.
Object Type:
Article
System:
The UNT Digital Library
Austenitizing and Microstructure of a HT-9 Steel
The effects of austenitizing temperatures and times on the microstructure of a 12Cr-1Mo-V-W steel are reported. Austenitizing temperatures covering the range of 900 to 1225/sup 0/C and times of 30 minutes to 100 hours were used. Equilibrium microstructures were difficult to obtain because delta ferrite initially present in the steel resists dissolution during austenitizing. 10 figures.
Date:
January 1, 1983
Creator:
Wilcox, R. C. & Chin, B. A.
Object Type:
Article
System:
The UNT Digital Library
Ion-induced surface modification of alloys
In addition to the accumulation of the implanted species, a considerable number of processes can affect the composition of an alloy in the surface region during ion bombardment. Collisions of energetic ions with atoms of the alloy induce local rearrangement of atoms by displacements, replacement sequences and by spontaneous migration and recombination of defects within cascades. Point defects form clusters, voids, dislocation loops and networks. Preferential sputtering of elements changes the composition of the surface. At temperatures sufficient for thermal migration of point defects, radiation-enhanced diffusion promotes alloy component redistribution within and beyond the damage layer. Fluxes of interstitials and vacancies toward the surface and into the interior of the target induce fluxes of alloying elements leading to depth-dependent compositional changes. Moreover, Gibbsian surface segregation may affect the preferential loss of alloy components by sputtering when the kinetics of equilibration of the surface composition becomes competitive with the sputtering rate. Temperature, time, current density and ion energy can be used to influence the individual processes contributing to compositional changes and, thus, produce a rich variety of composition profiles near surfaces. 42 references.
Date:
November 1, 1983
Creator:
Wiedersich, H.
Object Type:
Article
System:
The UNT Digital Library
Overfall
Access:
Use of this item is restricted to the UNT Community
Recording of Lelio Camilleri's Overfall. Transformed piano sounds and sound structures realized by means of voltage control make up the sound material of the piece.
Date:
1983
Creator:
Camilleri, Lelio
Object Type:
Sound
System:
The UNT Digital Library
Poema Reiterado
Access:
Use of this item is restricted to the UNT Community
Recording of Ricardo Mandolini's Poema Reiterado using the voice of Leonardo Martinez reciting Mandolini's own poem "Palabras" in an electro-acoustic composition. All sound material are disengaged from the speech of the spoken text (Sprachkomposition) which embodies the idea of the ancient synthesis between text and music. Realized at the Studio of the Musikhochschule in Cologne, Germany in 1983.
Date:
1983
Creator:
Mandolini, Ricardo, 1950-
Object Type:
Sound
System:
The UNT Digital Library
He met her in the park
Access:
Use of this item is restricted to the UNT Community
Recording of Charles Dodge's "He met her in the park," poetry by Richard Kostelanetz. The poem consists of a boy-meets-girl story that is told eight times, and the retellings abridged versions of the previous ones, sometimes reversing the gender roles until the final retelling is just "He met her in the park." In the composition, the lines are read by a male and female actor alternating lines and each telling of the story is articulated in a different way. The voices are synthesized with melodies, and over the piece, the voices become understood more like music which echoes the original language.
Date:
1983
Creator:
Dodge, Charles, 1942-
Object Type:
Sound
System:
The UNT Digital Library
Metal harmonics
Access:
Use of this item is restricted to the UNT Community
Recording of Margaret Sambell's Metal Harmonics. The short piece uses sounds developed by concrete and electronic means of a metallic resonance, much of it utilizing the rich overtone content of the sound source. The work was completed in April 1983 at the University of Birmingham.
Date:
April 1983
Creator:
Sambell, Margaret
Object Type:
Sound
System:
The UNT Digital Library