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Dissociative recombination of interstellar ions: electronic structure calculations for HCO/sup +/

Description: The present study of the interstellar formyl ion HCO/sup +/ is the first attempt to investigate dissociative recombination for a triatomic molecular ion using an entirely theoretical approach. We describe a number of fairly extensive electronic structure calculations that were performed to determine the reaction mechanism of the e-HCO/sup +/ process. Similar calculations for the isoelectronic ions HOC/sup +/ and HN/sub 2//sup +/ are in progress. 60 refs.
Date: July 2, 1985
Creator: Kraemer, W.P. & Hazi, A.U.
Partner: UNT Libraries Government Documents Department
open access

Solution of the Field Equations for 2-D Electromagnetic Direct Implicit Plasma Simulation

Description: A direct implicit particle-in-cell (PIC) simulation model with full electromagnetic (EM) effects has been implemented in 2-D Cartesian geometry. The model, implemented with the D/sub 1/ time differencing scheme, was first implemented in a 1-D electrostatic (ES) version to gain some experience with spatial differencing in forms suitable for extension to the full EM field in two dimensions. The implicit EM field solve is considerably different from the implicit ES code. The EM field calculation r… more
Date: January 2, 1985
Creator: Hewett, D. W. & Langdon, A. B.
Partner: UNT Libraries Government Documents Department
open access

LSI/CAMAC system for heavy elements research

Description: We have developed a LSI-11/23 computer-driven CAMAC data acquisition system. The 64 silicon-detector system is being used to investigate the alpha and spontaneous fission activities of short-lived transfermium isotopes by the real-time monitoring of the mother-daughter alpha decay sequence. A unique modular pulse processing electronics system was designed to simplify set up and calibration. The computer adjusts the gain of the CAMAC shaping amplifiers enabling the calibration and alignment of a… more
Date: May 2, 1985
Creator: Watkins, E. D.; Dougan, R. J. & McQuaid, J. H.
Partner: UNT Libraries Government Documents Department
open access

Ion cyclotron resonance heating (ICRH) start-up antenna for the mirror fusion test facility (MFTF-B)

Description: The purpose of the ICRH start-up antenna on MFTF-B is to heat the plasma and control the ion distribution as the density increases during start-up. The antenna, consisting of two center fed half turn loops phased 180/sup 0/ apart, has been designed for 1 MW of input power, with a goal of coupling 400 kW into the ions. To vary the heating frequency relative to the local ion cyclotron frequency, the antenna is tunable over a range from 7.5 to 12.5 MHz. The thermal requirements common to low duty … more
Date: October 2, 1985
Creator: McCarville, T.M. & Romesser, T.E.
Partner: UNT Libraries Government Documents Department
open access

Pulsed laser and ion beam surface modification of sintered alpha-SiC. [Using Ni overlayers]

Description: Pulsed laser annealing and ion beam mixing have been used as surface modification techniques to enhance the physical properties of polycrystalline ..cap alpha..-SiC. Thin Ni overlayers (20 nm to 100 nm) were evaporated onto the SiC surface. The specimens were subsequently irradiated with pulses of a ruby or krypton fluoride (KrF) excimer laser or bombarded with high energy Xe/sup +/ or Si/sup +/ ions. Both processes are nonequilibrium methods and each has been shown to induce unique microstruct… more
Date: December 2, 1985
Creator: More, K. L.; Davis, R. F.; Appleton, B. R.; Lowndes, D. & Smith, P.
Partner: UNT Libraries Government Documents Department
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