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Description
Plasma wakefield acceleration is a promising method of accelerating charged particles based on the excitation of strong electric fields in plasma. These fields arise when a driver, such as a particle beam or a laser pulse, propagates through the plasma and displaces electrons, forming a wave with accelerating gradients far exceeding those of conventional accelerators. In this work we study the case of a particle beam driver much longer than the plasma wavelength. Under these conditions the self-modulation instability develops, causing the beam to split into a sequence of microbunches. Using numerical simulations with the two-dimensional quasi-static code LCODE*, we investigate the properties of the formed microbunch train and its contribution to the excited wakefield. Based on these results, an analytical model describing the radial density profile of the microbunches is developed. The model predictions are in very good agreement with the simulation results. The analysis shows that the beam evolves into microbunches with a sharply peaked radial density distribution, differing from the initial Gaussian profile, which significantly increases the efficiency of wakefield excitation.
Footnotes
Kumar, Naveen, Alexander Pukhov, and Konstantin Lotov. "Self-modulation instability of a long proton bunch in plasmas." Physical review letters 104.25 (2010): 255003.
*Sosedkin, A. P., and K. V. Lotov. "LCODE: A parallel quasistatic code for computationally heavy problems of plasma wakefield acceleration." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 829 (2016): 350-352.
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