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Development of A Beam-Beam Simulation Code for e+e- Colliders

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2 Author(s)
Zhang, Y. ; IHEP, Beijing 100049, China, ; Ohmi, K.

BEPC will be upgraded into BEPCII, and the luminosity will be about 100 times higher. We developed a three dimensional strong-strong PIC code to study the beam-beam effects in BEPCII. The transportation through the arc is the same as that in Hirata’s weak-strong code. The beam-beam force is computed directly by solving the Poisson equation using the FACR method, and the boundary potential is computed by circular convolution. The finite bunch length effect is included by longitudinal slices. An interpolation scheme is used to reduce the required slice number in simulations. The standard message passing interface (MPI) is used to parallelize the code. The computing time increases linearly with (n + 1), where n is the slice number. The calculated luminosity of BEPCII at the design operating point is less than the design value. The best area in the tune space is near (0.505,0.57) according to the survey, where the degradation of luminosity can be improved.

Published in:

Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the

Date of Conference:

16-20 May 2005