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Electro-optic 3D snapshot of a laser wakefield accelerated kilo-ampere electron bunch

Light(Science & Applications) 2024年第5期13卷 823-834页

作者： Kai Huang Zhan Jin nobuhiko nakanii Tomonao Hosokai Masaki Kando Kansai Institute for Photon Science(KPSI) National Institutes for Quantum Science and Technology(QST)KyotoJapan. Laser Accelerator R&D Innovative Light Sources DivisionRIKEN SPring-8 CenterHyogoJapan. SANKEN Osaka UniversityOsakaJapan

Laser wakefield acceleration,as an advanced accelerator concept,has attracted great attentions for its ultrahigh acceleration gradient and the capability to produce high brightness electron *** three-dimensional(3D)density serves as an evaluation metric for the particle bunch quality and is intrinsically related to the applications of an *** its significance,this parameter has not been experimentally measured in the investigation of laser wakefield *** report on an electro-optic 3D snapshot of a laser wakefield electron bunch at a position outside the *** 3D shape of the electron bunch was detected by simultaneously performing optical transition radiation imaging and electro-optic *** 3D structures to a few micrometer levels were reconstructed using a genetic *** electron bunch possessed a transverse size of less than 30 *** current profile shows a multi-peak *** main peak had a duration of1 *** maximum electron 3D number density was~9×10^(21)m^(-3).This research demonstrates a feasible way of 3D density monitoring on femtosecond kilo-ampere electron bunches,at any position of a beam transport line for relevant applications.

关键词： laser acceleration field

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Supersonic gas jet stabilization in laser–plasma acceleration

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High Power Laser Science and Engineering 2023年第6期11卷 256-263页

作者： Zhen-Zhe Lei Yan-Jun Gu Zhan Jin Shingo Sato Alexei Zhidkov Alexandre Rondepierre Kai Huang nobuhiko nakanii Izuru Daito Masakai Kando Tomonao Hosokai SANKEN(Institute of Scientific and Industrial Research) Osaka UniversityIbarakiOsakaJapan Kansai Institute for Photon Science(KPSI) National Institutes for Quantum Science and Technology(QST)Kizugawa-cityKyotoJapan RIKEN SPring-8 Center SayoHyogoJapan

Supersonic gas jets generated via a conical nozzle are widely applied in the laser wakefield acceleration of *** stability of the gas jet is critical to the electron injection and the reproducibility of the wakefield *** we discussed the role of the stilling chamber in a modified converging-diverging nozzle to dissipate the turbulence and to stabilize the gas *** the fluid dynamics simulations and the Mach-Zehnder interferometer measurements,the instability originating from the nonlinear turbulence is studied and the mechanism to suppress the instability is *** the numerical and experimental results prove that the carefully designed nozzle with a stilling chamber is able to reduce the perturbation by more than 10% compared with a simple-conical nozzle.

关键词： shock injection hydrodynamic stability laser wakefield acceleration laser-plasma interaction

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