12,707 Matching Results

Search Results

Advanced search parameters have been applied.

MPS Data Acquisition System

Description: A description is given of the data acquisition system used with the multiparticle spectrometer facility at Brookhaven. Detailed information is provided on that part of the system which connects the detectors to the data handler; namely, the detector electronics, device controller, and device port optical isolator. (GHT)
Date: September 25, 1975
Creator: Eiseman, S. E. & Miller, W. J.
Partner: UNT Libraries Government Documents Department

Multilayer monochromators for neutron scattering

Description: In an earlier paper Schoenborn, Caspar, and Kammerer (J. Appl. Cryst. 7, 508-10(1974)) reported the fabrication of thin film monochromators for neutrons. They showed that a multilayer consisting of alternating films of two materials acts as a good monochromator with large and adjustable periodicity and wide bandwidth. The diffraction properties of these multilayers have been studied with the objective of using them as monochromators, filters and polarizers for neutrons. A theoretical understanding of these multilayers has been developed by using the kinematical and dynamical approaches. In order to compare these expressions with the observed properties, the effects of beam divergence and wavelength distribution for the spectrometer have been determined. The influence of some aperiodicity on the diffraction data has also been studied within the framework of kinematical theory. (auth)
Date: January 1, 1975
Creator: Saxena, A.M. & Schoenbon, B.P.
Partner: UNT Libraries Government Documents Department

Noise from cooling towers of power parks

Description: A study is presented of the noise pollution problem for large power parks proposed for the future. Such parks might have an area of about 75 sq. miles, and a generating capacity up to 48000 MW. A comparative analysis has been done for natural and mechanical-draft wet towers as the major sources of acoustic power. Noise radiation from single isolated towers as well as from a dispersed array of towers has been considered for both types of cooling systems. Major noise attenuation effects considered are due to the atmospheric absorption and A- weighting. Conditions of 60F and 70 percent relative humidity in a still atmosphere have been assumed. (auth)
Date: October 14, 1975
Creator: Zakaria, J. & Moore, F.K.
Partner: UNT Libraries Government Documents Department

Nonsteady heat conduction code with radiation boundary conditions

Description: A heat-transfer model for studying the temperature build-up in graphite blankets for fusion reactors is presented. In essence, the computer code developed is for two-dimensional, nonsteady heat conduction in heterogeneous, anisotropic solids with nonuniform internal heating. Thermal radiation as well as bremsstrahlung radiation boundary conditions are included. Numerical calculations are performed for two design options by varying the wall loading, bremsstrahlung, surface layer thickness and thermal conductivity, blanket dimensions, time step and grid size. (auth)
Date: January 1, 1975
Creator: Fillo, J.A.; Benenati, R. & Powell, J.
Partner: UNT Libraries Government Documents Department

Preliminary design and cost estimate for a 600 MeV, 20 microampere proton synchrotron

Description: A design study is presented for a 600 MeV proton synchrotron to yield an average current of 20 microamperes. Its purpose is production of negative pions for use in cancer therapy. The machine consists of a 4 MeV electrostatic preinjector, a 20 MeV linac injector, and a magnet ring about 20 meters in diameter. (auth)
Date: September 1, 1975
Creator: Blewett, J.P.; Chasman, R.; Cottingham, J.G.; Grand, P.; Green, G.K. & Lasky, C.
Partner: UNT Libraries Government Documents Department

Production and quality control of iodine-123

Description: The various methods for production and quality control are discussed. The author feels the $sup 123$Xe-$sup 123$I generator is the best method of production. Preparation and use of $sup 123$I-labeled compounds are also considered. (LK)
Date: January 1, 1975
Creator: Lambrecht, R.M.; Kondo, K. & Wolf, A.P.
Partner: UNT Libraries Government Documents Department

Radiation damage of nonmetallic solids

Description: A review of data and information on radiation damage in nonmetallic solids is presented. Discussions are included on defects in nonmetals, radiation damage processes in nonmetals, electronic damage processes, physical damage processes, atomic displacement, photochemical damage processes, and ion implantation. (JRD)
Date: January 1, 1975
Creator: Goland, A.N.
Partner: UNT Libraries Government Documents Department

Role and use of nuclear theories and models in practical evaluation of neutron nuclear data needed for fission and fusion reactor design and other nuclear applications

Description: A review of the various nuclear models used in the evaluation of neutron nuclear data for fission and fusion reactors is presented. Computer codes embodying the principles of the relevant nuclear models are compared with each other and with experimental data. The regions of validity and limitations of the conceptual formalisms are also included, along with the effects of the numerical procedures used in the codes themselves. Conclusions and recommendations for future demands are outlined.15 tables, 15 figures, 90 references. (auth)
Date: January 1, 1975
Creator: Prince, A.
Partner: UNT Libraries Government Documents Department

Steady-state plasma and reactor parameters for elliptical cross section tokamaks with very large power ratings

Description: In previous studies only circular cross section reactor plasmas were considered. The purpose of this research is to examine the effects of elliptical plasma cross sections. Several technological benefits have been determined. Maximum magnetic field strength requirements are 30 to 65 percent less than for 5000 MW (th) reactors and may be as much as 40 percent less than for circular cross section reactors of comparable size. Very large n tau values are found (10$sup 15$ to 10$sup 17$ sec/cm$sup 3$), which produce large burn-up fractions (15 to 60 percent). There is relatively little problem with impurity build-up. Long confinement times (60 to 500 seconds) are found. Finally, the elliptical cross section reactors exhibit a major toroidal radius reduction of as large as 30 percent over circular reactors operating at comparable power levels. (auth)
Date: June 1, 1975
Creator: Usher, J.L. & Powell, J.R.
Partner: UNT Libraries Government Documents Department

Steam generator and circulator model for the HELAP code

Description: An outline is presented of the work carried out in the 1974 fiscal year on the GCFBR safety research project consisting of the development of improved steam generator and circulator (steam turbine driven helium compressor) models which will eventually be inserted in the HELAP (1) code. Furthermore, a code was developed which will be used to generate steady state input for the primary and secondary sides of the steam generator. The following conclusions and suggestions for further work are made: (1) The steam-generator and circulator model are consistent with the volume and junction layout used in HELAP, (2) with minor changes these models, when incorporated in HELAP, could be used to simulate a direct cycle plant, (3) an explicit control valve model is still to be developed and would be very desirable to control the flow to the turbine during a transient (initially this flow will be controlled by using the existing check valve model); (4) the friction factor in the laminar flow region is computed inaccurately, this might cause significant errors in loss-of-flow accidents; and (5) it is felt that HELAP will still use a large amount of computer time and will thus be limited to design basis accidents without scram or loss of flow transients with and without scram. Finally it may also be used as a test bed for the development of prototype component models which would be incorporated in a more sophisticated system code, developed specifically for GCFBR's. (auth)
Date: July 1, 1975
Creator: Ludewig, H.
Partner: UNT Libraries Government Documents Department