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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Laser wakefield acceleration (LWFA)1 has been studied intensively due to the inherent ultrashort bunch duration (fs) and large acceleration gradient (GV/cm) over conventional accelerators. This regime is considered promising on construction of compact table-top X-ray free electron lasers (XFEL) which have broad application in ultrafast process studies2. The generation of XFEL relies on the process of self-amplification of spontaneous emission (SASE)3, which requires electron beam with extremely high current, low energy spread, and low emittance to cause micro-bunching. Also, the jitter issue in the pump-probe experiment is dependent on the electron injection timing. During LWFA experiment, it is essential to establish real time electron bunch temporal diagnostics to monitor the electron pulse duration and arrival time.
We present LWFA study via single-shot non-destructive electro-optic (EO) sampling4 technique for the first time. The electron spectra and divergence information had been detected simultaneously with electron bunch temporal signal. In the experiment, we observed stable and earlier electron pulse arrival time with higher plasma density. At density above 3×1019cm-3, multi-bunch signal was frequently observed. In addition, we achieved high quality electron bunch with divergence <1 mrad and energy spread <1 MeV in the self-modulated laser wakefield acceleration regime. PIC simulation has been performed to study the injection process. This diagnostic proved to have superior data attainability compared with previous works5-7 and could be introduced as a real time non-destructive electron pulse duration monitor for LWFA experiment.
Real-time Non-destructive Electro-optic Sampling Study on Laser Wakefield Acceleration
