Accession Number : ADA204895

Title :   Downstream Ray Tracing in Beam Optics Codes.

Descriptive Note : Final rept. Sep 84-Sep 87,

Corporate Author : UTAH UNIV SALT LAKE CITY DEPT OF ELECTRICAL ENGINEERING

Personal Author(s) : Reyes, Wilfredo B

PDF Url : ADA204895

Report Date : Oct 1988

Pagination or Media Count : 8

Abstract : Tunnel emittance growth in beams is a subtle phenomenon which requires the use of highly accurate simulation codes and methods to achieve reliable results. This report discusses use of self-consistent beam optics codes in studies of emittance growth in very long PPM focused electron beams. A novel method by which a given problem can be accurately solved in a stairstep series downstream is presented. The deformable mesh code is used to simulate a gridded gun focused by a double period magnetic field used in a high power coupled cavity traveling-wave tube. Solution coupling across the boundary is presented in detail. The study also uncovered a fundamental problem with paraxial based codes (Neuman boundary implicit) making their use unsuitable in emittance growth studies. Keywords: Electron beams; Beam optics; Paraxial based codes; Electron optics; Simulation codes; Periodic permanent magnets. (jhd)

Descriptors :   *BEAMS(RADIATION), *RADIOFREQUENCY, ACCURACY, CODING, CONSISTENCY, COUPLING(INTERACTION), DEFORMATION, ELECTRON BEAMS, ELECTRON OPTICS, EMITTANCE, FOCUSING, GRIDS, GROWTH(GENERAL), GUNS, MESH, OPTICS, PERMANENT MAGNETS, RAY TRACING, RELIABILITY, SIMULATION, SOLUTIONS(GENERAL), TUNNELS

Subject Categories : Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE