No. 57 (00173)

Family name : MacLachlan
Given name : James A.
Affiliation : Fermi National Accelerator Laboratory
Abbreviation : Fermilab
E-mail address : maclachlan@fnal.gov
Title : Evaluation of Longitudinal Emittance Growth Caused by Negative
        Mass Instability in Proton Synchrotrons
Authors : James A. MacLachlan
Abstract : 
The theory of negative mass instability in proton synchrotrons has been
regarded as established for about thirty years, but both accurate
calculations and solid beam observations for real cases have been
difficult and practically non-existent. The wider availability of
so-called computing farms has made credible macroparticle simulations
practical for routine use. The comparison of a macroparticle model with
the existing theory indicates interesting discrepencies, although the
theoretical threshold is confirmed. That comparison and code validation
for the model are discussed in the context of practical specific cases.