Hannover 2016 – scientific programme

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P: Fachverband Plasmaphysik

P 16: Theory and Modelling II

P 16.5: Talk

Wednesday, March 2, 2016, 15:40–15:55, b302

Equilibrium and stability of a modulated beam in a plasma wakefield — •Roberto Martorelli — Heinrich Heine Universität, 40225 Düsseldorf, Germany

Particle beams are necessary in a wide range of applications, from medicine to high energy physics. On the other hand the production of always improved beam with the actual technology results in an increasingly dimensions of the accelerator facilities. One promising alternative to RF accelerators is the plasma wakefield acceleration, due to the high acceleration gradients the plasma can sustain. In a plasma wakefield, a driver - laser or particle beam - is injected in a plasma channel, exciting Langmuir waves. The intense electric field carried by the wakefield can be then used for the acceleration of a witness bunch.

Our work is focused on the wakefield driven by a modulated beam. The core of the research consists in the analysis of the equilibrium configuration achieved by the modulated structure as well as in the transverse stability during the propagation in the plasma channel. A long lasting modulated beam is of key importance for an optimal energy transfer from the driver to the witness bunch. Through a semi-analytical approach, combined with particle-in-cell simulations, we study for the initial configuration achieved by the modulated beam, looking subsequently for the proper conditions in order to obtain a stable structure during the propagation in the plasma.