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in creator/contributor: "Jones, J."

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Laser-Compton Scattering as a Potential Electron Beam Monitor

LCS experiments were carried out at the Idaho Accelerator Center (IAC); sharp monochromatic x-ray lines were observed. These are produced using the so-called inverse Compton effect, whereby optical laser photons are collided with a relativistic electron beam. The back-scattered photons are then kinematically boosted to keV x-ray energies. We have first demonstrated these beams using a 20 MeV electron beam collided with a 100 MW, 7 ns Nd; YAG laser. We observed narrow LCS x-ray spectral peaks re… more

Date: December 14, 2002

Creator: Chouffani, K.; Wells, D.; Harmon, F.; Lancaster, G. & Jones, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Nonlinear Schwarz-Fas Methods for Unstructured Finite Element Elliptic Problems

This paper provides extensions of an element agglomeration AMG method to nonlinear elliptic problems discretized by the finite element method on general unstructured meshes. The method constructs coarse discretization spaces and corresponding coarse nonlinear operators as well as their Jacobians. We introduce both standard (fairly quasi-uniformly coarsened) and non-standard (coarsened away) coarse meshes and respective finite element spaces. We use both kind of spaces in FAS type coarse subspac… more

Date: September 30, 2002

Creator: Jones, J E; Vassilevski, P S & Woodward, C S