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Optimized K (alpha) x-ray flashes from femtosecond-laser-irradiated foils
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SYSNO ASEP 0330461 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Optimized K (alpha) x-ray flashes from femtosecond-laser-irradiated foils Title Optimalizované K (alpha) rentgenové zdroje z tenkých terčů ozářených femtosekundovým laserovým pulzem Author(s) Lu, W. (DE)
Nicoul, M. (DE)
Shymanovich, U. (DE)
Tarasevitch, A. (DE)
Zhou, P. (DE)
Sokolowski-Tinten, K. (DE)
von der Linde, D. (DE)
Mašek, Martin (FZU-D) RID, ORCID
Gibbon, P. (DE)
Teubner, U. (DE)Source Title Physical Review E. - : American Physical Society - ISSN 1539-3755
Roč. 80, č. 2 (2009), 026404/1-026404/10Number of pages 10 s. Language eng - English Country US - United States Keywords copper ; electron density ; high-speed optical techniques ; plasma density ; plasma production by laser ; plasma simulation ; plasma x-ray sources ; titanium Subject RIV BL - Plasma and Gas Discharge Physics R&D Projects LC528 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) CEZ AV0Z10100523 - FZU-D (2005-2011) UT WOS 000269637900082 DOI 10.1103/PhysRevE.80.026404 Annotation We investigate the generation of ultrashort K alpha pulses from plasmas produced by intense femtosecond p-polarized laser pulses on Cu and Ti targets. Particular attention is given to the interplay between the angle of incidence of the laser beam on the target and a controlled prepulse. It is observed experimentally that the K alpha yield can be optimized for correspondingly different prepulse and plasma scale-length conditions. For steep electron-density gradients, maximum yields can be achieved at larger angles. For somewhat expanded plasmas expected in the case of laser pulses with a relatively poor contrast, the K alpha yield can be enhanced by using a near-normal-incidence geometry. For a certain scale-length range (between 0.1 and 1 times a laser wavelength) the optimized yield is scale-length independent. Physically this situation arises because of the strong dependence of collisionless absorption mechanisms on the angle of incidence and the plasma scale length. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2010
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