Physics – Accelerator Physics
Scientific paper
2000-08-30
Phys.Rev.ST Accel.Beams 4 (2001) 011001
Physics
Accelerator Physics
16 pages, 5 figures, 1 table
Scientific paper
10.1103/PhysRevSTAB.4.011001
A highly accurate self-consistent particle code to simulate the beam-beam collision in $e^+e^-$ storage rings has been developed. It adopts a method of solving the Poisson equation with an open boundary. The method consists of two steps: assigning the potential on a finite boundary using the Green's function, and then solving the potential inside the boundary with a fast Poisson solver. Since the solution of the Poisson's equation is unique, our solution is exactly the same as the one obtained by simply using the Green's function. The method allows us to select much smaller region of mesh and therefore increase the resolution of the solver. The better resolution makes more accurate the calculation of the dynamics in the core of the beams. The luminosity simulated with this method agrees quantitatively with the measurement for the PEP-II B-factory ring in the linear and nonlinear beam current regimes, demonstrating its predictive capability in detail.
Cai Yunhai
Chao Alex W.
Tajima Toshi
Tzenov Stephan I.
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