Modular supersonic nozzle for the stable laser-driven electron acceleration

The sharp density down-ramp injection (shock injection) mechanism produces the quasi-monoenergetic electron beam with a bunch duration of tens of femtoseconds via laser wakefield acceleration. The stability of the accelerated electron beam strongly depends on the stability of the laser beam and the...

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Bibliographic Details
Published in:Review of scientific instruments 2024-01, Vol.95 (1)
Main Authors: Lei, Zhenzhe, Jin, Zhan, Gu, Yan-Jun, Sato, Shingo, Zhidkov, Alexei, Rondepierre, Alexandre, Huang, Kai, Nakanii, Nobuhiko, Daito, Izuru, Kando, Masaki, Hosokai, Tomonao
Format: Article
Language:English
Subjects:
Chambers
Computational fluid dynamics
Electron acceleration
Electron beams
Gas flow
Laser beams
Modular design
Supersonic nozzles
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Summary:The sharp density down-ramp injection (shock injection) mechanism produces the quasi-monoenergetic electron beam with a bunch duration of tens of femtoseconds via laser wakefield acceleration. The stability of the accelerated electron beam strongly depends on the stability of the laser beam and the shock structure produced by the supersonic gas nozzle. In this paper, we report the study of a newly designed modular supersonic nozzle with a flexible stilling chamber and a converging–diverging structure. The performance of the nozzle is studied both numerically and experimentally with the computational fluid dynamics simulation and the Mach–Zehnder interferometry method. The simulation results and the experimental measurements are well consistent, and both prove the effectiveness of the stilling chamber in stabilizing the gas flow.
ISSN:0034-6748
1089-7623
DOI:10.1063/5.0181414