Modeling and Simulation of Longitudinal Dynamics for LER-HER PEP II Rings

Conference · Tue Mar 06 04:00:00 EST 2007

OSTI ID:900593

Rivetta, Claudio; Mastorides, T; Fox, J D; Teytelman, D; Van Winkle, D

A time domain modeling and simulation tool for beam-cavity interactions in LER and HER rings at PEP II are presented. The motivation for this tool is to explore the stability margins and performance limits of PEP II RF systems at higher currents and upgraded RF configurations. It also serves as test bed for new control algorithms and can define the ultimate limits of the architecture. The time domain program captures the dynamical behavior of the beam-cavity interaction based on a reduced model. The ring current is represented by macro-bunches. Multiple RF station in the ring are represented via one or two macro-cavities. Each macro-cavity captures the overall behavior of all the 2 or 4 cavity RF station. Station models include nonlinear elements in the klystron and signal processing. This allows modeling the principal longitudinal impedance control loops interacting with the longitudinal beam model. Validation of simulation tool is in progress by comparing the measured growth rates for both LER and HER rings with simulation results. The simulated behavior of both machines at high currents are presented comparing different control strategies and the effect of non-linear klystrons in the growth rates.

• Research Organization: Stanford Linear Accelerator Center (SLAC)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 900593
• Report Number(s): SLAC-PUB-12375
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
ALGORITHMS
ARCHITECTURE
Accelerators
ACCPHY
ACCSYS
ENG
INST
IMPEDANCE
KLYSTRONS
PERFORMANCE
PROCESSING
RF SYSTEMS
RING CURRENTS
SIMULATION
STABILITY
VALIDATION