Diffusion mechanism of particle beams in the presence of phase modulation in double RF systems

Conference · Tue May 04 00:00:00 EDT 1999

OSTI ID:6581

Ball, M.; Chu, C. M.; Hamilton, B.; Jeon, D.; Kang, X.; Kiang, L. L.; Lee, S. Y.; Ng, K. Y.; Pei, A.; Sloan, T.

The particle diffusion mechanism due to phase modulation on one of the rf cavities in a double rf system is studied. We find that the Einstein relation is satisfied if there is a global chaos in the phase space. On the other hand, the ex-istence of dominant parametric resonances forces the par-ticles streaming along the separatrix, which may result in anomalous diffusion process. The particle tracking simu-lations based on the Hamiltonian for the double rf system is employed to reveal the essential diffusion mechanism. Also for the first time, a coherent octuple mode has been observed in the bunch beam excitation. The phase space evolution of the octuple mode is displayed.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• OSTI ID: 6581
• Report Number(s): FERMILAB-Conf-99/112-T; ON: DE00006581
• Resource Relation: Conference: 18th Particle Accelerator Conference, New York, New York, March 29-April 2, 1999
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
43 PARTICLE ACCELERATORS
RF Systems
Diffusion
Phase Oscillations
Modulation
Particle Beams