Journal
REVIEW OF SCIENTIFIC INSTRUMENTS
Volume 93, Issue 3, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0071761
Keywords
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Funding
- National Research, Development and Innovation Fund of Hungary [2018-2.1.14-TET-CN2018-00040, 20182.1.14-TET-CN]
- National Natural Science Foundation of China (NSFC) [12074399, 12004403]
- Foundation of Chinese Academy of Science [CXJJ-21S015, XDA25020105]
- Key Projects of International Intergovernmental Scientific and Technological Innovation Cooperation [2021YFE0116700]
- European Union [GINOP-2.3.6-15-2015-00001]
- European Regional Development Fund
- President's International Fellowship Initiative (PIFI) of the Chinese Academy of Sciences (CAS)
- International Partnership Program of CAS [181231KYSB20170022]
- Inter-Governmental Science and Technology Cooperation of the Chinese Ministry of Science and Technology (MOST)
- Science and Technology Commission of Shanghai Municipality [19560713700, 20ZR1464400]
- European Union
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This study presents a new PW-based LWFA instrument at the SG-II 5 PW laser facility, which focuses on achieving cm-scale laser-plasma interaction Rayleigh length and observing electron beams by utilizing relativistic self-focusing of laser pulses at high gas-pressure thresholds.
Laser wakefield acceleration (LWFA) using PW-class laser pulses generally requires cm-scale laser-plasma interaction Rayleigh length, which can be realized by focusing such pulses inside a long underdense plasma with a large f-number focusing optic. Here, we present a new PW-based LWFA instrument at the SG-II 5 PW laser facility, which employs f/23 focusing. The setup also adapted an online probing of the plasma density via Nomarski interferometry using a probe laser beam having 30 fs pulse duration. By focusing 1-PW, 30-fs laser pulses down to a focal spot of 230 mu m, the peak laser intensity reached a mild-relativistic level of 2.6 x 10(18) W/cm(2), a level modest for standard LWFA experiments. Despite the large aspect ratio of >25:1 (transverse to longitudinal dimensions) of the laser pulse, electron beams were observed in our experiment only when the laser pulse experienced relativistic self-focusing at high gas-pressure thresholds, corresponding to plasma densities higher than 3 x 10(18) cm(-3). Published under an exclusive license by AIP Publishing.
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