Abstract
A simplified model describing the PWFA (plasma wakefield acceleration) transverse instability in the form of a wake function parameterized only with an effective cavity aperture radius a is benchmarked against PIC-simulations. This wake function implies a 1/a4 scaling of the transverse wakefields, which indicates transverse intra-beam wakefields typically several orders of magnitude higher than in conventional acceleration structures. Furthermore, the wakefield formalism is utilized to perform a parameter study for a 1.5 TeV plasma wakefield accelerator, where the constraint on drive beam to main beam efficiency imposed by transverse wakefields is taken into account. Eventually, a parameter set with promising properties in terms of energy spread, stability and luminosity per power was found.
Highlights
PWFA is one of the most promising novel acceleration technologies able to generate accelerating gradients in the multi-GV/m level [1]
We will conduct a parameter study of the efficiency of a 1.5 TeV plasma wakefield accelerator using the Snowmass parameter set as a basis, but taking into account transverse wakefield and the damping effect of energy spread using the approach of a parameter scan
Even though several conceptual parameter sets for a PWFA-LC have been proposed, no PWFALC studies have so far considered the constraint of efficiency imposed by transverse instabilities
Summary
PWFA is one of the most promising novel acceleration technologies able to generate accelerating gradients in the multi-GV/m level [1]. Transverse wakefields in PWFA can be several orders of magnitude larger than in metallic cavities due to the significantly smaller dimension of a plasma ion bubble, so a good understanding of possible mitigation methods is necessary for a global parameter optimization for a PWFA-LC (plasma wakefield acceleration linear collider). One such mitigation method is BNS damping [3], a well-known technique in RF accelerators, where a correlated energy spread is induced along the beam to disrupt the coherence buildup of transverse oscillations. We will conduct a parameter study of the efficiency of a 1.5 TeV plasma wakefield accelerator using the Snowmass parameter set as a basis, but taking into account transverse wakefield and the damping effect of energy spread using the approach of a parameter scan
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