In Situ Measurement of Electron Energy Evolution in a Laser-Plasma Accelerator

We report on a novel, noninvasive method applying Thomson scattering to measure the evolution of the electron beam energy inside a laser-plasma accelerator with high spatial resolution. The determination of the local electron energy enabled the in-situ detection of the acting acceleration fields wit...

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Bibliographic Details
Published in:Physical review letters 2022-12, Vol.129 (24), p.244801-244801, Article 244801
Main Authors: Bohlen, S, Brümmer, T, Grüner, F, Lindstrøm, C A, Meisel, M, Staufer, T, Streeter, M J V, Veale, M C, Wood, J C, D'Arcy, R, Põder, K, Osterhoff, J
Format: Article
Language:English
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Summary:We report on a novel, noninvasive method applying Thomson scattering to measure the evolution of the electron beam energy inside a laser-plasma accelerator with high spatial resolution. The determination of the local electron energy enabled the in-situ detection of the acting acceleration fields without altering the final beam state. In this Letter we demonstrate that the accelerating fields evolve from (265±119)  GV/m to (9±4)  GV/m in a plasma density ramp. The presented data show excellent agreement with particle-in-cell simulations. This method provides new possibilities for detecting the dynamics of plasma-based accelerators and their optimization.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.129.244801