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© The Author(s), 2025. Published by Cambridge University Press in association with Chinese Laser Press. This work is licensed under the Creative Commons  Attribution – Non-Commercial License https://creativecommons.org/licenses/by-nc/4.0 (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

Fast electron generation and transport in high-intensity laser–solid interactions induces X-ray emission and drives ion acceleration. Effective production of these sources hinges on an efficient laser absorption into the fast electron population and control of divergence as the beam propagates through the target. Nanowire targets can be employed to increase the laser absorption, but it is not yet clear how the fast electron beam properties are modified. Here we present novel measurements of the emittance of the exiting fast electron beam from irradiated solid planar and nanowire targets via a pepper-pot diagnostic. The measurements indicate a greater fast electron emittance is obtained from nanowire targets. Two-dimensional particle-in-cell simulations support this conclusion, revealing beam defocusing at the wire–substrate boundary, a higher fast electron temperature and transverse oscillatory motion around the wires.

Details

Title
An investigation of the emittance of escaping fast electron beams from planar and nanowire targets
Author
Hume, E J 1   VIAFID ORCID Logo  ; Köster, P 1 ; Baffigi, F 1 ; Brandi, F 1   VIAFID ORCID Logo  ; Calestani, D 2 ; Cristoforetti, G 1   VIAFID ORCID Logo  ; Fulgentini, L 1 ; Labate, L 1 ; Marasciulli, A 3 ; Morris, S 4 ; Palla, D 1 ; Salvadori, M 1 ; Villani, M 2 ; Gizzi, L A 1   VIAFID ORCID Logo  ; Lancaster, K L 5 

 Intense Laser Irradiation Laboratory (ILIL), INO-CNR, Pisa, Italy 
 IMEM-CNR, Parma, Italy 
 Intense Laser Irradiation Laboratory (ILIL), INO-CNR, Pisa, Italy; Current address: INFN Laboratori Nazionali del Gran Sasso, LNGS-INFN, Assergi, AQ, Italy 
 Department of Physics, University of Warwick, Coventry, UK 
 York Plasma Institute, University of York, York, UK 
Publication year
2025
Publication date
2025
Publisher
Cambridge University Press
ISSN
20954719
e-ISSN
20523289
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
3188307772
Copyright
© The Author(s), 2025. Published by Cambridge University Press in association with Chinese Laser Press. This work is licensed under the Creative Commons  Attribution – Non-Commercial License https://creativecommons.org/licenses/by-nc/4.0 (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.