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A high-intensity plasma-sputter heavy negative ion source

Description: A multicusp magnetic field plasma surface ion source, normally used for H/sup /minus//ion beam formation, has been modified for the generation of high-intensity, pulsed, heavy negative ion beams suitable for a variety of uses. To date, the source has been utilized to produce mA intensity pulsed beams of more than 24 species. A brief description of the source, and basic pulsed-mode operational data, (e.g., intensity versus cesium oven temperature, sputter probe voltage, and discharge pressure), are given. In addition, illustrative examples of intensity versus time and the mass distributions of ion beams extracted from a number of samples along with emittance data, are also presented. Preliminary results obtained during dc operation of the source under low discharge power conditions suggest that sources of this type may also be used to produce high-intensity (mA) dc beams. The results of these investigations are given, as well, and the technical issues that must be addressed for this mode of operation are discussed. 15 refs., 10 figs., 2 tabs.
Date: January 1, 1989
Creator: Alton, G.D.; Mori, Y.; Takagi, A.; Ueno, A. & Fukumoto, S.
Partner: UNT Libraries Government Documents Department

A high brightness plasma sputter heavy negative ion source

Description: A high-intensity, pulsed-mode, plasma-sputter heavy negative ion source has been developed; this source holds promise for a number of uses, including tandem electrostatic accelerator/synchrotron injection applications. To date, the source has been used to generate mA intensities from more than 18 sputter probes. A brief description of the source and typical performance data for a number of ion species are given. In addition, basic ion source operational data, such as intensity versus cesium oven temperature, sputter probe voltage, and discharge pressure, along with emittance data, are presented. 12 refs., 11 figs., 2 tabs.
Date: January 1, 1988
Creator: Alton, G.D.; Mori, Y.; Takagi, A.; Ueno, A. & Fukumoto, S.
Partner: UNT Libraries Government Documents Department

Methodology for reliability based condition assessment. Application to concrete structures in nuclear plants

Description: Structures in nuclear power plants may be exposed to aggressive environmental effects that cause their strength to decrease over an extended period of service. A major concern in evaluating the continued service for such structures is to ensure that in their current condition they are able to withstand future extreme load events during the intended service life with a level of reliability sufficient for public safety. This report describes a methodology to facilitate quantitative assessments of current and future structural reliability and performance of structures in nuclear power plants. This methodology takes into account the nature of past and future loads, and randomness in strength and in degradation resulting from environmental factors. An adaptive Monte Carlo simulation procedure is used to evaluate time-dependent system reliability. The time-dependent reliability is sensitive to the time-varying load characteristics and to the choice of initial strength and strength degradation models but not to correlation in component strengths within a system. Inspection/maintenance strategies are identified that minimize the expected future costs of keeping the failure probability of a structure at or below an established target failure probability during its anticipated service period.
Date: August 1, 1993
Creator: Mori, Y. & Ellingwood, B.
Partner: UNT Libraries Government Documents Department

Equivalent circuit study of beam-loading using a moment method

Description: In this work, we present a formalism by considering the perturbations in the moments of a bunched beam for the equivalent circuit model to include all harmonics of the synchroton oscillation in a beam-cavity interaction system. The linear coupling among all longitudinal modes under the influence of narrow-band impedance can be naturally incorporated in this new approach. We used this method to re-examine the coupling between the dipole and the quadrupole modes. The dispersion relation obtained by this new method was compared with that derived from the linearized Vlasov equation up to the second harmonic of the synchrotron motion. We found excellent qualitative agreements between two approaches.
Date: August 1, 1997
Creator: Wang, T.F.; Machida, S.; Mori, Y. & Ohmori, C.
Partner: UNT Libraries Government Documents Department

Towards the photoreduction of CO{sub 2} with Ni(bpy){sub n}{sup 2+} complexes

Description: When an acetonitrile solution containing Ni(bpy){sub 3}{sup 2+}, trithylamine and CO{sub 2} is irradiated at 313 nm, CO is produced with a quantum yield {approximately} 0.1% (defined as CO produced/photons absorbed). Flash photolysis, electrochemistry, and pulse radiolysis experiments provide evidence for the formation of Ni{sup I}(bpy){sub 2+}, as an intermediate, in the photochemical Ni(bpy){sub 3}{sup 2+}/TEA/CO{sub 2} system. Although Ni{sup 0}(bpy){sub 2} does react with CO{sub 2}, Ni{sup I}(bpy){sub 2+} seems unreactive toward CO{sub 2} addition. The x-ray structure of [Ni{sub 3}(bpy){sub 6}](ClO{sub 4}), which crystallize as blue-violet needles, reveals the existence of a dimer in the solid. UV-vis spectra also indicate that reduced Ni(bpy){sub 3}{sup 2+} solutions contain Ni{sup I}(bpy){sub 2+}, Ni{sup 0}(bpy){sub 2} and [Ni(bpy){sub 2}]{sub 2} complexes in equilibrium.
Date: August 1, 1995
Creator: Mori, Y.; Szalda, D.J.; Brunschwig, B.S.; Schwarz, H.A. & Fujita, E.
Partner: UNT Libraries Government Documents Department

Asymmetry measurements in PP elastic scattering during polarized beam acceleration up to 4. 4 GeV/c

Description: This is a brief report on the first measurement of the continuous momentum dependence of the analyzing power in proton-proton elastic scattering during polarized beam acceleration from 1.1 to 4.4 GeV/c. The measurement was done in the KEK-PS tunnel using an internal polyethylene thread target. The momentum bin size ranges from 5 to 18 MeV/c. Statistical uncertainty of the analyzing power is typically 0.5% per momentum bin. A small narrow structure has been observed at the incident proton momentum of 1.23 GeV/c. 2 refs., 4 figs.
Date: January 1, 1989
Creator: Shimizu, H.; Yoshida, H.; Ohnuma, H.; Kobayashi, Y.; Kobayashi, K.; Nakagawa, T. et al.
Partner: UNT Libraries Government Documents Department

Accelerator Design Concept for Future Neutrino Facilities

Description: This document summarizes the findings of the Accelerator Working Group (AWG) of the International Scoping Study (ISS) of a Future Neutrino Factory and Superbeam Facility. The work of the group took place at three plenary meetings along with three workshops, and an oral summary report was presented at the NuFact06 workshop held at UC-Irvine in August, 2006. The goal was to reach consensus on a baseline design for a Neutrino Factory complex. One aspect of this endeavor was to examine critically the advantages and disadvantages of the various Neutrino Factory schemes that have been proposed in recent years.
Date: February 3, 2008
Creator: Group, ISS Accelerator Working; Zisman, Michael S; Berg, J. S.; Blondel, A.; Brooks, S.; Campagne, J.-E. et al.
Partner: UNT Libraries Government Documents Department

The partial Siberian snake experiment at the Brookhaven AGS

Description: We are building a 4.7 Tesla-meter room temperature solenoid to be installed in a 10-foot long AGS straight section. This experiment will test the idea of using a partial snake to correct all depolarizing imperfection resonances and also test the feasibility of betatron tune jump in correction intrinsic resonances in the presence of a partial snake.
Date: December 31, 1992
Creator: Huang, H.; Caussyn, D. D.; Ellison, T.; Jones, B.; Lee, S. Y.; Schwandt, P. et al.
Partner: UNT Libraries Government Documents Department