Title :
Longitudinal bunched-beam instabilities in a barrier RF system
Author :
Chin, Y.H. ; Tsutsui, H.
Author_Institution :
KEK, Ibaraki, Japan
Abstract :
This paper deals with theoretical and numerical analysis of longitudinal instabilities in a barrier RF system. A theory was developed to formulate using the Vlasov equation and the synchrotron-energy mode expansion. The result can be expressed in a form of eigenvalue matrix. A simulation code ECLIPS (Evaluation Code for Longitudinal Instabilities in a Proton Synchrotron) was also developed. Both were applied to the JHF 50 GeV proton synchrotron at injection. They show excellent agreements. The results demonstrate that the microwave and the negative mass instabilities in a bunched beam can be explained by mode-coupling instabilities
Keywords :
Vlasov equation; accelerator RF systems; eigenvalues and eigenfunctions; high energy physics instrumentation computing; matrix algebra; numerical analysis; particle beam bunching; particle beam injection; particle beam stability; proton accelerators; synchrotrons; 50 GeV; ECLIPS code; JHF proton synchrotron; Vlasov equation; barrier RF system; eigenvalue matrix; injection; longitudinal bunched-beam instabilities; microwave instabilities; mode-coupling instabilities; negative mass instabilities; numerical analysis; synchrotron-energy mode expansion; Analytical models; Damping; Eigenvalues and eigenfunctions; Equations; Numerical analysis; Optical coupling; Particle beams; Protons; Radio frequency; Synchrotrons;
Conference_Titel :
Particle Accelerator Conference, 1997. Proceedings of the 1997
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-4376-X
DOI :
10.1109/PAC.1997.750753
