Updating Of Beam Dynamics In The Clic Main Linac

INTRODUCTION In a linear collider, the dynamics of the beam that travels in the linac is simultaneously constrained by the focusing conditions and the wakefields that are unavoidably present in the linac, and by the strong forces that disrupt the bunch when it collides with a counter travelling bunch of opposite charge. On the one hand, the three dimensions of the bunch as well as its population must satisfy criteria to ensure beam stability and bunch coherence while minimizing perturbations such as linear coupling and wakefield deflections in order to prevent emittance dilution. On the other hand, the same beam parameters must be carefully selected for optimizing the luminosity, its distribution at collision as a function of the energy of the leptons that interact and emit photons, and the intrinsic energy spread of the beam before collision. In the Compact Linear Collider (CLIC), the wakefields associated with the high frequency (R-band) of the accelerating structures are s