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Brilliance improvement of laser-produced soft x-ray plasma by a barrel shock

Mey, Tobias and Rein, Martin and Großmann, Peter and Mann, Klaus (2012) Brilliance improvement of laser-produced soft x-ray plasma by a barrel shock. New Journal of Physics, 14 (7), pp. 1-15. Institute of Physics (IOP) Publishing. doi: 10.1088/1367-2630/14/7/073045. ISSN 1367-2630.

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Official URL: http://iopscience.iop.org/1367-2630/14/7/073045/


A method is presented for improving the brilliance of laser-produced soft x-ray sources that are based on pulsed gas jets as the targets. The conversion efficiency of laser energy into soft x-ray radiation is enhanced by locally increasing the particle density of the target species. This is achieved by applying a small background pressure to the supersonic flow emanating from a nozzle. In this manner, a supersonic jet with a so-called barrel shock system is formed. On passing the shocks, particles become locally concentrated, forming highdensity regions that are used as the targets. An estimate of possible increases in particle densities is provided. The jet flow is then analyzed experimentally by Schlieren imaging, thus visualizing the spatial shock structure. Additionally, a quantitative measurement of the gas density is made using a Hartmann–Shack wavefront sensor. The beneficial effect of the applied background gas on plasma generation is clearly more prominent than its absorbing effect on the photons originating from the plasma. This is shown for a nitrogen target with helium as the background gas. A plasma, generated behind the barrel shock in the nitrogen jet, emits monochromatic photons at a wavelength of 2.88 nm. The peak brilliance of the source is increased by an order of magnitude, resulting in 3.15×1016 photons (mm2 mrad2 s)−1.

Item URL in elib:https://elib.dlr.de/77021/
Document Type:Article
Additional Information:Paper 073045
Title:Brilliance improvement of laser-produced soft x-ray plasma by a barrel shock
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Großmann, PeterLaser-Laboratorium Göttingen e.V.,Göttingen, Germany UNSPECIFIED
Mann, KlausLaser-Laboratorium Göttingen e.V.,Göttingen, Germany UNSPECIFIED
Journal or Publication Title:New Journal of Physics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 1-15
Publisher:Institute of Physics (IOP) Publishing
Keywords:soft x-ray, EUV (extreme ultra violet), soft x-ray source, brilliance, gaseous laser target, laser-produced plasma, underexpanded jet, scattering regime, barrel shock, Hartmann–Shack sensor
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > High Speed Configurations
Deposited By: Danzer, Kristina
Deposited On:23 Oct 2012 15:02
Last Modified:08 Mar 2018 18:47

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