Improving a high-power laser-based relativistic electron source: the role of laser pulse contrast and gas jet density profile

Grigoriadis A; Andrianaki G; Fitilis IDimitriou VClark E lPapadogiannis N ABenis E PTatarakis M

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Improving a high-power laser-based relativistic electron source: the role of laser pulse contrast and gas jet density profile

机译：Improving a high-power laser-based relativistic electron source: the role of laser pulse contrast and gas jet density profile

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Abstract A relativistic electron source based on high power laser interaction with gas jet targets has been developed at the Institute of Plasma Physics and Lasers of the Hellenic Mediterranean University. Initial measurements were conducted using the ‘Zeus’ 45 TW laser with peak intensities in the range of 1018–1019 W cm−2 interacting with a He pulsed gas jet having a 0.8 mm diameter nozzle. A significant improvement of the electron signal was measured after using an absorber to improve the laser pulse contrast from 10−10 to 10−11. A high stability quasi-mono-energetic electron beam of about 50 MeV was achieved and measured using a magnetic spectrometer for pulsed gas jet backing pressure of 12 bar. Supplementary studies using a 3 mm diameter nozzle for backing pressures in the range of 35–40 bar showed electron beam production with energies spread in the range from 50 to 150 MeV. The pulsed jet density profile was determined using interferometric techniques. Particle-in-cell simulations, at the above experimentally determined conditions, support our experimental findings.

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《Plasma physics and controlled fusion》 |2022年第4期|共6页
作者
Grigoriadis A; Andrianaki G; Fitilis IDimitriou VClark E lPapadogiannis N ABenis E PTatarakis M;
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University of Ioannina;

Institute of Plasma Physics and Lasers, Hellenic Mediterranean University Research Centre;

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正文语种英语
中图分类等离子体物理学;
关键词
laser wakefield acceleration (LWFA); laser plasma interaction; electron beams;

Improving a high-power laser-based relativistic electron source: the role of laser pulse contrast and gas jet density profile

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