学術雑誌論文 Electro-optic spatial decoding on the spherical-wavefront Coulomb fields of plasma electron sources

黄, 開  ,  エシロケポフ, ティムル  ,  コーガ, ジェームズ  ,  小瀧, 秀行  ,  森, 道昭  ,  林, 由紀雄  ,  中新, 信彦  ,  ブラノフ, セルゲイ  ,  神門, 正城

8pp.2938-1 - 2938-10 , 2018-02 , Nature Publishing Group
内容記述
Detections of the pulse durations and arrival timings of relativistic electron beams are important issuesin accelerator physics. Electro-optic diagnostics on the Coulomb fields of electron beams have theadvantages of single shot and non-destructive characteristics. We present a study of introducing theelectro-optic spatial decoding technique to laser wakefield acceleration. By placing an electro-opticcrystal very close to a gas target, we discovered that the Coulomb field of the electron beam possessed aspherical wavefront and was inconsistent with the previously widely used model. The field structure wasdemonstrated by experimental measurement, analytic calculations and simulations. A temporal mappingrelationship 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 accelerationexperiments.

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