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Present capabilities and new developments in antenna modeling with the numerical electromagnetics code NEC

Description: Computer modeling of antennas, since its start in the late 1960's, has become a powerful and widely used tool for antenna design. Computer codes have been developed based on the Method-of-Moments, Geometrical Theory of Diffraction, or integration of Maxwell's equations. Of such tools, the Numerical Electromagnetics Code-Method of Moments (NEC) has become one of the most widely used codes for modeling resonant sized antennas. There are several reasons for this including the systematic updating a… more
Date: April 8, 1988
Creator: Burke, G. J.
Item Type: Refine your search to only Article
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Studies of nuclear reactions at very low energies: Annual progress report

Description: The main thrust of the research program was directed at the acquisition, installation and initial operation of the General Ionex Model 1545 charged particle accelerator which will be used in the subsequent reaction cross section measurements. The initial operation of the accelerator has been quite successful, with all of the crucial characteristics meeting or exceeding design specifications. We have made preliminary measurements of the reactions 12C(rho,..gamma..)13N/sup 11/B(rho,..gamma..)/sup… more
Date: February 8, 1988
Creator: Cecil, F. E.
Item Type: Refine your search to only Report
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Study of heavy ion beams during longitudinal compression using particle simulation

Description: Particle simulations show that during longitudinal compression, there is little growth in beam longitudinal and transverse emittance. Both longitudinal and transverse temperatures follow adiabatic laws. The compressed beam has negligible longitudinal momentum spread and therefore can satisfy stringent requirements for final focusing. 4 refs., 3 figs.
Date: August 8, 1988
Creator: Ho, D.D.M. & Brandon, S.T.
Item Type: Refine your search to only Article
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Chloride content of Rocky Flats scrub alloy twelfth campaign solution following head end treatment

Description: A single batch of dissolver solution from the twelfth Rocky Flats Scrub Alloy (RFSA) campaign has been analyzed for chloride content following head end treatment to reduce its concentration. Scrub alloy buttons were dissolved in Tank 6.4D during July. In subsequent head end processing, chloride was precipitated with mercurous ion added as the nitrate. The precipitate, Hg{sub 2}Cl{sub 2}, was co-removed with the gelatin floc via centrifugation. Duplicate samples from Tank 11.2, containing the he… more
Date: August 8, 1988
Creator: Holcomb, H. P.
Item Type: Refine your search to only Report
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Chloride content of dissolver solution from Rocky Flats scrub alloy ninth and tenth campaigns following head end treatment

Description: F-Canyon continues to obtain excellent chloride removal from Rocky Flats scrub alloy (RFSA) dissolver solution during head end treatment. One single batch of solution from the ninth RFSA campaign, dissolved in January and February of this year, and two batches from the tenth campaign, dissolved in February, have been successfully processed. Following dissolution in Tank 6.4D, chloride was precipitated with mercurous ion added as the nitrate. The precipitate, Hg{sub 2}Cl{sub 2}, was concurrently… more
Date: March 8, 1988
Creator: Holcomb, H.P.
Item Type: Refine your search to only Report
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Backgrounds to the detection of two-body hadronic B decays

Description: We consider backgrounds to the detection of the two-body hadronic decay modes of neutral B mesons and baryons. The largest background is due to the correlated production of pairs of high-p/sub T/ hadrons in the target, but this can be adequately rejected provided the experimental apparatus has sufficient resolution in mass and decay vertex. Another possible source of background arises from the production and decay of charmed and strange particles. Since these particles can travel considerable d… more
Date: January 8, 1988
Creator: Kaplan, D. M.; Peng, Jen-Chieh; Abrams, G. S. & Stockdale, I. E.
Item Type: Refine your search to only Article
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Hyperfine interactions, the key to multiquark physics

Description: Clues in the search for a fundamental description of hadron physics based on QCD may be obtained from a phenomenological constituent quark model in which the color-electric force binds quarks into saturated color-singlet hadrons, and finer details of the spectrum and multiquark physics are dominated by the color-magnetic hyperfine interaction. 47 refs.
Date: August 8, 1988
Creator: Likpink, H.J.
Item Type: Refine your search to only Article
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Search for a QGP with a TPC spectrometer, and QGP signals predicted by new event generator

Description: The BNL/CCNY/Johns Hopkins/Rice Collaboration has developed and successfully tested a TPC Magnetic Spectrometer to search for OGP signals produced by ion beams at AGS. Test data with 14.5 GeV/c /times/ A Oxygen ions incident on a Pb target has been obtained. These include a 78-prong nuclear interaction in the MPS magnet which was pattern recognized with an efficiency approx.75%. A cascade and plasma event generator has also been developed, the predictions of which are used to illustrate how our… more
Date: December 8, 1988
Creator: Lindenbaum, S. J.
Item Type: Refine your search to only Article
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Initial evaluation of photographic data of F- and H-Area seepage basin outcrops

Description: Photographic data for the Savannah River Plant (SRP) were reviewed for 1961 through 1987 to determine the value of this photography in estimating the timing and extent of the F- and H-Area seepage basin outcrops along the upper Four Mile Creek floodplain. In excess of 15,000 frames of photography of the SRP were reviewed. The quality of the photography varied widely and included panchromatic (black and white), natural color, and false color infrared. Altitudes of the photography ranged from 2,0… more
Date: February 8, 1988
Creator: Mackey, H. E., Jr.
Item Type: Refine your search to only Report
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Prospects for 6 to 10 tesla magnets for a TEVATRON upgrade

Description: The first SSC physics is at least 10 years away. An upgrade of the Fermilab Tevatron will ensure the continuity of a vigorous high-energy physics program until the SSC turns on. Three basic proposals are under consideration: /bar p/p at 3 /times/ 10/sup 31/ --Increase luminosity by improvements to the p source. pp at 1 TeV and 2 /times/ 10/sup 32/--Move the main ring to a new tunnel, build a second Tevatron ring, and /bar p/p > 1.5 TeV and 7 /times/ 10/sup 30/--Replace the tevatron with a highe… more
Date: July 8, 1988
Creator: Mantsch, Paul M.
Item Type: Refine your search to only Report
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X-ray diffractometry of lanthanum-nickel-aluminum alloys

Description: X-ray diffractometry provides much useful information on LANA alloys that complements data obtained by SEM and Electron Microprobe Analysis. Accurate measurements of the hexagonal lattice parameters of the primary LaNi{sub 5-y}Aly phase reveal the aluminum content (y) and allow the prediction of desorption pressures for the hydrogen isotopes. A study of the broadening of x-ray diffraction lines of the LaNi{sub 5-y}Aly primary phase caused by cyclic absorption and desorption of hydrogen suggests… more
Date: August 8, 1988
Creator: Mosley, W. C.
Item Type: Refine your search to only Article
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X-ray diffractometry of lanthanum-nickel-aluminum alloys. Part 1

Description: X-ray diffractometry provides much useful information on LANA alloys that complements data obtained by SEM and Electron Microprobe Analysis. Accurate measurements of the hexagonal lattice parameters of the primary LaNi{sub 5-y}Aly phase reveal the aluminum content (y) and allow the prediction of desorption pressures for the hydrogen isotopes. A study of the broadening of x-ray diffraction lines of the LaNi{sub 5-y}Aly primary phase caused by cyclic absorption and desorption of hydrogen suggests… more
Date: August 8, 1988
Creator: Mosley, W. C.
Item Type: Refine your search to only Article
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Modulation of continuous electron beams in plasma wake-fields

Description: In this paper we discuss the interaction of a continuous electron beam with wake-field generated plasma waves. Using a one-dimensional two fluid model, a fully nonlinear analytical description of the interaction is obtained. The phenomena of continuous beam modulation and wave period shortening are discussed. The relationship between these effects and the two-stream instability is also examined. 12 refs., 1 fig.
Date: September 8, 1988
Creator: Rosenzweig, J.B.
Item Type: Refine your search to only Report
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Charge and angular correlated inelasticities in MeV/nucleon ion-atom collisions

Description: Using an Elbek high-resolution magnetic spectrograph, we measured energy loss an angular distributions of MeV/nucleon projectile ions in coincidence with target recoil-ion charge state. We investigated collisions of 10 and 20 MeV C/sup 6 +/ on He, Ne, Ar, and Kr where the target atom is multiply ionized and the projectile emerges in charge state q or q-1. The amount of energy transferred to the continuum electrons exceeds, by far, the sum of the values of the ionization potentials and shows a s… more
Date: November 8, 1988
Creator: Schoene, H.; Schuch, R.; Datz, S.; Dittner, P. F.; Giese, J. P.; Krause, H. F. et al.
Item Type: Refine your search to only Article
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Efficiency calculations for the direct energy conversion system of the Cadarache neutral beam injectors

Description: A prototype energy conversion system is presently in operation at Cadarache, France. Such a device is planned for installation on each six neutral beam injectors for use in the Tore Supra experiment in 1989. We present calculations of beam performance that may influence design considerations. The calculations are performed with the DART charged particle beam code. We investigate the effects of cold plasma, direct energy conversion and neutral beam production. 4 refs., 6 figs., 4 tabs.
Date: June 8, 1988
Creator: White, R.C.
Item Type: Refine your search to only Report
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