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          Institute: MPI für Physik     Collection: YB 2016     Display Documents

ID: 715733.0, MPI für Physik / YB 2016
Seeding of Self-Modulation Instability of a Long Electron Bunch in a Plasma
Authors:Fang, Y.; Yakimenko, V. E.; Babzien, M.; Fedurin, M.; Kusche, K. P.; Malone, R.; Vieira, J.; Mori, W. B.; Muggli, P.
Date of Publication (YYYY-MM-DD):2014
Title of Journal:Physical Review Letters
Journal Abbrev.:Phys.Rev.Lett.
Issue / Number:112
Start Page:045001
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:We demonstrate experimentally that a relativistic electron bunch shaped with a sharp rising edge drives plasma wakefields with one to seven periods along the bunch as the plasma density is increased. The plasma density is varied in the 1015–1017  cm−3 range. The wakefields generation is observed after the plasma as a periodic modulation of the correlated energy spectrum of the incoming bunch. We choose a low bunch charge of 50 pC for optimum visibility of the modulation at all plasma densities. The longitudinal wakefields creating the modulation are in the MV/m range and are indirect evidence of the generation of transverse wakefields that can seed the self-modulation instability, although the instability does not grow significantly over the short plasma length (2 cm). We show that the seeding provides a phase reference for the wakefields, a necessary condition for the deterministic external injection of a witness bunch in an accelerator. This electron work supports the concept of similar experiments in the future, e.g., SMI experiments using long bunches of relativistic protons.
Classification / Thesaurus:AWAKE
External Publication Status:published
Document Type:Article
Communicated by:MPI für Physik
Affiliations:MPI für Physik
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