Accurate single-shot measurement technique for the spectral distribution of GeV electron beams from a laser wakefield accelerator

We present a technique, based on a dipole magnet spectrometer containing multiple scintillation screens, to accurately characterize the spectral distribution of a GeV electron beam generated by laser wakefield acceleration (LWFA). An optimization algorithm along with a numerical code was developed f...

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Bibliographic Details
Published inarXiv.org
Main Authors Hojbota, Calin Ioan, Hyung Taek Kim, Shin, Jung Hun, Aniculaesei, Constantin, Bobbili Sanyasi Rao, Chang Hee Nam
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 04.07.2019
Subjects
Acceleration
Algorithms
Computer simulation
Dipoles
Divergence
Electron beams
Electrons
Energy spectra
Laser beams
Lasers
Measurement techniques
Monte Carlo simulation
Optimization
Screens
Trajectories
Variation
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Summary:We present a technique, based on a dipole magnet spectrometer containing multiple scintillation screens, to accurately characterize the spectral distribution of a GeV electron beam generated by laser wakefield acceleration (LWFA). An optimization algorithm along with a numerical code was developed for trajectory tracing and reconstructing the electron beam angle, divergence, and energy spectrum with a single-shot measurement. The code was validated by comparing the results with the Monte-Carlo simulation of electron beam trajectories. We applied the method to analyze data obtained from laser wakefield acceleration experiments performed using a multi-Petawatt laser to accelerate electron beams to multi-GeV energy. Our technique offers improved accuracy to faithfully characterize electron beams with non-negligible shot-to-shot beam pointing fluctuations, particularly in the state-of-the-art multi-GeV LWFA experiments performed to push the energy frontier.
ISSN:2331-8422