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Architecture and Performance of the PEP-II Low-Level RF System

Description: Heavy beam loading in the PEP-II B Factory along with large ring circumferences places unique requirements upon the low-level rf (LLRF) system. RF feedback loops must reduce the impedance observed by the beam while ignoring the cavity transients caused by the ion clearing gap. Special attention must be placed on the cavity tuner loops to allow matching the ion clearing gap transients in the high energy ring and the low energy ring. A wideband fiber optic connection to the longitudinal feedback … more
Date: April 14, 1999
Creator: Corredoura, Paul L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Exponential Monte Carlo Convergence of a Three-Dimensional Discrete Ordinates Solution

Description: Recent work on obtaining exponential convergence for three-dimensional solutions to the spatially and angularly continuous monoenergetic transport equation with isotropic scattering using the reduced source method was promising. The method, however, used two separate estimates of the scalar flux, a Legendre expansion (in the spatial variables) and a quadrature of the angular flux. This introduced an inconsistency that may have lead to some convergence problems. To remove this inconsistency and … more
Date: November 14, 1999
Creator: Favorite, J.A. & Lichtenstein, H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Exponential Monte Carlo Convergence on a Homogeneous Right Parallelepiped Using the Reduced Source Method with Legendre Expansion

Description: In previous work, exponential convergence of Monte Carlo solutions using the reduced source method with Legendre expansion has been achieved only in one-dimensional rod and slab geometries. In this paper, the method is applied to three-dimensional (right parallelepiped) problems, with resulting evidence suggesting success. As implemented in this paper, the method approximates an angular integral of the flux with a discrete-ordinates numerical quadrature. It is possible that this approximation i… more
Date: September 1, 1999
Creator: Favorite, J.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Angular quadratures for improved transport computations

Description: This paper introduces new octant-range, composite-type Gauss and mid-point rule angular quadrature formulas for neutron and photon transport computations. A generalization to octant-range quadratures is also introduced in order to allow for discontinuities at material interfaces for two- and three-dimensional transport problems which can be modeled with 60-degree triangular or hexagonal mesh subdivisions in the x-y plane.
Date: July 22, 1999
Creator: Abu-Shumays, I.K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A Heterogeneous Medium Analytical Benchmark

Description: A benchmark, called benchmark BLUE, has been developed for one-group neutral particle (neutron or photon) transport in a one-dimensional sub-critical heterogeneous plane parallel medium with surface illumination. General anisotropic scattering is accommodated through the Green's Function Method (GFM). Numerical Fourier transform inversion is used to generate the required Green's functions which are kernels to coupled integral equations that give the exiting angular fluxes. The interior scalar f… more
Date: September 27, 1999
Creator: Ganapol, B. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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