量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum Science and Technology.
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Detections of the pulse durations and arrival timings of relativistic electron beams are important issues
in accelerator physics. Electro-optic diagnostics on the Coulomb fields of electron beams have the
advantages of single shot and non-destructive characteristics. We present a study of introducing the
electro-optic spatial decoding technique to laser wakefield acceleration. By placing an electro-optic
crystal very close to a gas target, we discovered that the Coulomb field of the electron beam possessed a
spherical wavefront and was inconsistent with the previously widely used model. The field structure was
demonstrated by experimental measurement, analytic calculations and simulations. A temporal mapping
relationship with generality was derived in a geometry where the signals had spherical wavefronts.
This study could be helpful for the applications of electro-optic diagnostics in laser plasma acceleration
experiments.
Electro-optic spatial decoding on the spherical-wavefront Coulomb fields of plasma electron sources
