| Paper |
Title |
Page |
| MOPKF081 |
Peak Current Optimization for LCLS Bunch Compressor 2
|
506 |
| |
- A.C. Kabel, P. Emma
SLAC, Menlo Park, California
|
|
| |
The performance of an FEL will be a function of both the driving bunch's current and its slice emittance. We have studied a set of parameters for the bunch compression section of the LCLS, simulating the effects of Coherent Synchrotron Radiation (CSR) on the slice emittance of the bunch core as a function of peak current. We use the code TraFiC4 for a three-dimensional, self-consistent simulation on parallel computers. While higher currents will increase FEL performance, its detrimental effects, due to CSR, on slice emittance will counteract this beneficial effect. From our simulations, we determine a near-optimum current, balancing these effects.
|
|
| MOPKF082 |
A Multi-bunch, Three-dimensional, Strong-strong Beam-beam Simulation Code for Parallel Computers
|
509 |
| |
- A.C. Kabel, Y. Cai
SLAC, Menlo Park, California
|
|
| |
We have developed a parallel simulation code allowing the self-consistent, three-dimensional simulation of the strong-strong beam-beam effect, using a particle-on-mesh technique and fast elliptic solvers. It is able to operate with sufficiently high logitudinal resolution to treat phase-averaging and hourglass effects in the interaction point (IP) correctly. This code has been generalized to handle the collisions of an arbitrary set of bunches at arbitrary positions in the ring (parasitic crossings), using appropriately reduced longitudinal resolution of collisions not in the design IP. We provide benchmarking results and parameter studies based on PEP-II.
|
|