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Rev Sci Instrum. 2018 Aug;89(8):083302. doi: 10.1063/1.5024872.

Cherenkov radiation-based optical fibre diagnostics of fast electrons generated in intense laser-plasma interactions.

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Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
Key Laboratory for Laser Plasmas (MoE) and School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.
Central Laser Facility, Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0QX, United Kingdom.
Department of Physics, York Plasma Institute, University of York, Heslington York YO10 5DD, United Kingdom.
Department of Physics, SUPA, University of Strathclyde, Glasgow G4 0NG, United Kingdom.


Diagnosing fast electrons is important to understand the physics underpinning intense laser-produced plasmas. Here, we demonstrate experimentally that a Cherenkov radiation-based optical fibre can serve as a reliable diagnostic to characterize the fast electrons escaping from solid targets irradiated by ultra-intense laser pulses. Using optical fibre loops, the number and angular distributions of the escaping electrons are obtained. The data agree well with measurements made using image plate stacks. The optical fibre can be operated at high-repetition rates and is insensitive to x-rays and ion beams, which makes it advantageous over other routinely used fast electron diagnostics in some aspects.


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