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Mixed mode operation in CTX

Description: Mixed method of operation with input powers of 10 MW to 20-MW results in hotter (..delta..T/sub e/ approx. 30 eV) longer lived spheromaks (approx. 200 ..mu..s longer) than slow mode operation. However, a further increase in driving current is detrimental to the temperature of the spheromak (possibly due to the injection of impurities). In the mixed method, n = 2 oscillations no longer appear during the decay, apparently due to the sustainment of currents in the outer flux surfaces. This sustain… more
Date: January 1, 1984
Creator: Hoida, H. W.; Barnes, C. W.; Henins, I. & Jarboe, T. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Fluctuations and Transport in Fusion Plasmas. Final Report

Description: The energy confinement in tokamaks in thought to be limited by transport caused by plasma turbulence. Three dimensional plasma particle-in-cell (PIC) codes are used to model the turbulent transport in tokamaks to attempt to understand this phenomena so that tokamaks can be made more efficient. Presently, hundreds of hours of Cray time are used to model these experiments and much bigger and longer runs are desired, to model a large tokamak with realistic parameters is beyond the capability of ex… more
Date: February 1, 1995
Creator: Gould, R. W. & Liewer, P. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Effect of viscosity on seismic response of waste storage tanks

Description: A study of the effect of viscosity on the dynamic response of a liquid storage tank subjected to base excitations is presented. The tank is a typical high level waste storage tank which has a diameter of 50 ft. and liquid height of 20.4 ft. The liquid density is taken to be 93.6 lb/ft{sup 3}. The tank is assumed to be rigid. Both harmonic and earthquake excitations are used in the study. The finite element method is employed to attack the problem. The response functions examined include the slo… more
Date: September 1, 1993
Creator: Tang, Y.; Uras, R. A.; Chang, Y. W. & Eckert, H. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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THE HARD-CORE PINCH. PART II

Description: The toroidal version of the hard-core pinch tube is created by levitating a ring conductor inside a toroidal shell. The magnitude of induced H/ sub theta / necessary for levi-tation is small in terms of field strengths normally desired for energetic pinches. In a 3-in. glass-and-copper toroid of square cross section a 3/4-in. hollow copper ring has been levitated with a 60- cycle current of 3 kiloamperes. A 12-in stainless steel tube of round cross section is being built. The stability of nearv… more
Date: July 31, 1959
Creator: Birdsall, D.H.; Colgate, S.A. & Furth, H.P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Kinetic theory of toroidicity-induced Alfven eigenmode

Description: An analytic kinetic description of the toroidicity-induced Alfven eigenmode (TAE) is presented. The theory includes electron parallel dynamics non-perturbatively, an effect which is found to strongly influence the character and damping of the TAE --- contrary to previous theoretical predictions. We use a parallel conductivity model that includes collisionless (Landau) damping on the passing electrons and collisional damping on both trapped and passing electrons. Together, these mechanisms damp … more
Date: March 1, 1992
Creator: Mett, R. R. & Mahajan, S. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Design of a boiling water reactor equilibrium core using thorium-uranium fuel

Description: In this paper the design of a Boiling Water Reactor (BWR) equilibrium core using thorium is presented; a heterogeneous blanket-seed core arrangement concept was adopted. The design was developed in three steps: in the first step two different assemblies were designed based on the integrated blanket-seed concept, they are the blanket-dummy assembly and the blanket-seed assembly. The integrated blanketseed concept comes from the fact that the blanket and the seed rods are located in the same asse… more
Date: October 6, 2004
Creator: Francois, J-L.; Nunez-Carrera, A.; Espinosa-Paredes, G. & Martin-del-Campo, C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Phoenix I energy extraction experiment

Description: Energy extraction experiments are reported for the Phoenix I amplifier driven by a discharge-initiated oscillator-preamplifier system operating on mixtures of either SF/sub 6/-HI or SF/sub 6/-C/sub 2/H/sub 6/ and an electron-beam-initiated intermediate amplifer (lambda-3) fueled with H/sub 2/ and F/sub 2/ mixtures. When the oscillator-preamplifier system operated with mixtures of SF/sub 6/-HI the input spectrum to the Phoenix I amplifier contained approx. 28 P-branch vibrational-rotational line… more
Date: July 1, 1980
Creator: Hoffman, J. M.; Patterson, E. L.; Tisone, G. C. & Moreno, J. B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A Fortran 90 code for magnetohydrodynamics

Description: This report describes progress in developing a Fortran 90 version of the KITE code for studying plasma instabilities in Tokamaks. In particular, the evaluation of convolution terms appearing in the numerical solution is discussed, and timing results are presented for runs performed on an 8k processor Connection Machine (CM-2). Estimates of the performance on a full-size 64k CM-2 are given, and range between 100 and 200 Mflops. The advantages of having a Fortran 90 version of the KITE code are s… more
Date: March 1, 1992
Creator: Walker, D. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Magnetic field measurements of Fermilab/General Dynamics built full scale SSC collider dipole magnets

Description: This paper presents preliminary results of magnetic field measurements made on a series of 50 mm aperture 15 m long SSC collider dipole magnets designed and manufactured at Fermi National Accelerator Laboratory (Fermilab) for use in the Superconducting Super Collider Laboratory (SSCL) Accelerator System String Test. The magnets were assembled by Fermilab and General Dynamics personnel, and were tested at the Magnet Test Facility (MTF) at Fermilab. Measurements of the dipole field angle, dipole … more
Date: April 1, 1992
Creator: Delchamps, S.; Bleadon, M.; Bossert, R.; Carson, J.; Gourlay, S.; Hanft, R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Towards quantum information processing with impurity spins insilicon

Description: The finding of algorithms for factoring and data base search that promise substantially increased computational power, as well as the expectation for efficient simulation of quantum systems have spawned an intense interest in the realization of quantum information processors [1]. Solid state implementations of quantum computers scaled to >1000 quantum bits ('qubits') promise to revolutionize information technology, but requirements with regard to sources of decoherence in solid state environ… more
Date: March 1, 2004
Creator: Schenkel, T.; Liddle, J. A.; Bokor, J.; Rangelow, I. W.; Park, S. J. & Persaud, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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COMMERCIALIZATION DEMONSTRATION OF MID-SIZED SUPERCONDUCTING MAGNETIC ENERGY STORAGE TECHNOLOGY FOR ELECTRIC UTILITYAPPLICATIONS

Description: As an outgrowth of the Technology Reinvestment Program of the 1990’s, an Agreement was formed between BWXT and the DOE to promote the commercialization of Superconducting Magnetic Energy Storage (SMES) technology. Business and marketing studies showed that the performance of electric transmission lines could be improved with this SMES technology by stabilizing the line thereby allowing the reserved stability margin to be used. One main benefit sought was to double the capacity and the amount of… more
Date: June 24, 2008
Creator: WEBER, CHARLES M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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RF OSCILLATIONS AND POWER OUTPUT IN ALKALINE THERMIONIC CONVERTERS

Description: Experiments were made using a potassium plasma cell with a Ta emitter and a Ag-plated Cu collector. The r-f frequencies, rms voltages, power output, and other quantities were measured under various conditions of emitter temperature, potassium vapor pressure, and d-c and r-f loads. Ion and electron densities were calculated and compared with the oscillations occurring. (D.L.C.)
Date: April 1, 1962
Creator: Richards, H. K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Coil and iron design for SSC 50 mm magnet

Description: In this paper we present the design of the two dimensional coil and iron cross section, referred to as DSX201/W6733, for the 50 mm aperture dipole magnet being built at the Brookhaven National Laboratory for the Superconducting Super Collider (SSC). The computed values of the allowed field harmonics as a function of current, the quench performance predictions, the stored energy calculations, the effect of random errors on the coil placement and the Lorentz forces on the coil will be presented. … more
Date: January 1, 1990
Creator: Gupta, R. C.; Kahn, S. A. & Morgan, G. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Effects of energetical particles on ballooning modes in high temperature tokamaks

Description: This report describes the work done by Science Applications International Corporation to study the effects of energetic particles on the microstability of a high temperature tokamak. The effects of an energetic population on ballooning modes in a large aspect ratio, shifted circular flux surface tokamak equilibrium are investigated with the newly developed gryokinetic numerical technique. The gryokinetic equations for the background ion and electron, as well as that of the energetic population … more
Date: January 22, 1992
Creator: Tsang, K.T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A self-consistent theory of collective alpha particle losses induced by Alfvenic turbulence

Description: The nonlinear dynamics of kinetic Alfven waves, resonantly excited by energetic ions/alpha particles, is investigated. It is shown that {alpha}-particles govern both linear instability and nonlinear saturation dynamics, while the background MHD turbulence results only in a nonlinear real frequency shift. The most efficient saturation mechanism is found to be self-induced profile modification. Expressions for the fluctuation amplitudes and the {alpha}-particle radial flux are self-consistently d… more
Date: January 1, 1992
Creator: Biglari, H. (Princeton Univ., NJ (United States). Plasma Physics Lab.) & Diamond, P.H. (California Univ., San Diego, La Jolla, CA (United States). Dept. of Physics)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Nonstationary interference and scattering from random media

Description: For the small angle scattering of coherent plane waves from inhomogeneous random media, the three dimensional mean square distribution of random fluctuations may be recovered from the interferometric detection of the nonstationary modulational structure of the scattered field. Modulational properties of coherent waves scattered from random media are related to nonlocal correlations in the double sideband structure of the Fourier transform of the scattering potential. Such correlations may be ex… more
Date: December 1, 1991
Creator: Nazikian, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Comparisons of theoretically predicted transport from ion temperature gradient instabilities to L-mode tokamak experiments

Description: The theoretical transport from kinetic micro-instabilities driven by ion temperature gradients is a sheared slab is compared to experimentally inferred transport in L-mode tokamaks. Low noise gyrokinetic simulation techniques are used to obtain the ion thermal transport coefficient X. This X is much smaller than in experiments, and so cannot explain L-mode confinement. Previous predictions based on fluid models gave much greater X than experiments. Linear and nonlinear comparisons with the flui… more
Date: December 1, 1991
Creator: Kotschenreuther, M.; Wong, H.V.; Lyster, P.L.; Berk, H.L.; Denton, R.; Miner, W.H. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Constraints of observations of solar oscillations on solar models with mixing by turbulent diffusion

Description: The pulsational behavior of solar models with mixing produced by turbulent diffusion has been investigated, for both p (pressure) modes and g (gravity) modes. It is found that while a small amount of mixing may be allowed by the observed data on solar oscillations, values of the pseudo-Reynolds number large enough to reduce the predicted neutrino counting rate to the level seen by the /sup 37/Cl experiment are in conflict with published solar oscillation data. 8 references, 8 figures, 2 tables.
Date: January 1, 1984
Creator: Cox, A. N.; Kidman, R. B. & Newman, M. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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RR Lyrae and BL Herculis variables

Description: The RR Lyrae variables are currently believed to have masses between about 0.5 and 0.8 M/sub solar mass/, effective surface temperatures between 6350 and 7500/sup 0/K, radii from about 4.0 to 6.0 R/sub solar mass/ and luminosities between log L/L/sub solar mass/ of 1.5 and 2.0. Since they are found in population II locations, they generally have Y = 0.3 and Z = 10/sup -3/, but there are exceptions for both higher Z like the sun and lower Z like 0.0002. In globular clusters the periods range fro… more
Date: January 1, 1980
Creator: Cox, A. N.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Thermal oscillations downstream of an elbow in stratified pipe flow

Description: In previously published papers, the test geometry, test methodology and the scope of the thermal transient induced pipe stratification studies at Argonne National Laboratory (ANL) were explained. In these prior studies, limited fluid temperature data from elbow inlet and exit plane thermocouples indicated the presence of large-amplitude thermal fluctuations for conditions in which the horizontal pipe upstream of the elbow developed stratified flow induced by a pipe entrant thermal transient. Un… more
Date: January 1, 1984
Creator: Kuzay, T. M. & Kasza, K. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Active internal corrector coils

Description: Trim or corrector coils to correct main magnet field errors and provide higher multipole fields for beam optics purposes are a standard feature of superconducting magnet accelerator systems. This paper describes some of the design and construction features of powered internal trim coils and a sampling of the test results obtained.
Date: January 1, 1986
Creator: Thompson, P.A.; Cottingham, J.; Dahl, P.; Fernow, R.; Garber, M.; Ghosh, A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Phase-Space Analysis of Convection in a /sup 3/He - Superfluid /sup 4/He Solution

Description: Observations have been made on thermal convection below 1K in a dilute solution of /sup 3/He in superfluid /sup 4/He contained in a cylindrical cell of aspect ratio GAMMA = 1.20. Complicated oscillatory phenomena were observed with a high degree of reproducibility using two temperature sensors. Phase-space analysis suggests a description in terms of strange-attractor dynamics.
Date: January 1, 1982
Creator: Haucke, H. & Maeno, Y.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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