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Title: Relation between field energy and RMS emittance in intense particle beams

An equation is presented for continuous beams with azimuthal symmetry and continuous linear focusing, which expresses a relationship between the rate of change for squared rms emittance and the rate of change for a quantity we call the nonlinear field energy. The nonlinear field energy depends on the shape of the charge distribution and corresponds to the residual field energy possessed by beams with nonuniform charge distributions. The equation can be integrated for the case of an rms matched beam to yield a formula for space-charge-induced emittance growth that we have tested numerically for a variety of initial distributions. The results provide a framework for discussing the scaling of rms emittance growth and an explanation for the well-established lower limit on output emittance. 15 refs., 4 figs.
Authors:
; ; ;
Publication Date:
OSTI Identifier:
5735912
Report Number(s):
LA-UR-85-1622; CONF-850504-58
ON: DE85012655
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Particle accelerator conference, Vancouver, Canada, 13 May 1985
Research Org:
Los Alamos National Lab., NM (USA); Maryland Univ., College Park (USA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; PARTICLE BEAMS; BEAM EMITTANCE; SIMULATION; BEAM DYNAMICS; NUMERICAL SOLUTION; OSCILLATIONS; SPACE CHARGE; BEAMS 430200* -- Particle Accelerators-- Beam Dynamics, Field Calculations, & Ion Optics