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High-brightness water-window electron-impact liquid-jet microfocus source
KTH, School of Engineering Sciences (SCI), Applied Physics, Biomedical and X-ray Physics.
KTH, School of Engineering Sciences (SCI), Applied Physics, Biomedical and X-ray Physics.ORCID iD: 0000-0001-7637-1850
KTH, School of Engineering Sciences (SCI), Applied Physics, Biomedical and X-ray Physics.ORCID iD: 0000-0002-4394-0591
KTH, School of Engineering Sciences (SCI), Applied Physics, Biomedical and X-ray Physics.ORCID iD: 0000-0003-2723-6622
2010 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 96, no 8Article in journal (Refereed) Published
Abstract [en]

We demonstrate stable high-brightness operation of an electron-impact water-jet-anode soft x-ray source. A 30 kV, 7.8 W electron beam is focused onto a 20 mu m diameter jet resulting in water-window oxygen line emission at 525 eV/2.36 nm with a brightness of 3.0x10(9) ph/(sx mu m(2)xsrxline). Monte Carlo-based modeling shows good quantitative agreement with the experiments. The source has potential to increase the x-ray power and brightness by another 1-2 orders of magnitude and fluid-dynamical jet instabilities is determined to be the most important limiting factor. The source properties make it an attractive alternative for table-top x-ray microscopy.

Place, publisher, year, edition, pages
2010. Vol. 96, no 8
Keyword [en]
electron beam effects, flow instability, jets, Monte Carlo methods, X-ray microscopy, X-ray production, x-ray source
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-19265DOI: 10.1063/1.3310281ISI: 000275027200093Scopus ID: 2-s2.0-77749292089OAI: oai:DiVA.org:kth-19265DiVA: diva2:337312
Funder
Swedish Research Council
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Electron-Impact Liquid-Jet Water-Window X-ray Sources
Open this publication in new window or tab >>Electron-Impact Liquid-Jet Water-Window X-ray Sources
2010 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

This Thesis describes the development and characterization of a soft x-ray liquidjet-anode electron-impact source. With a water-jet target the primary emission is the O Kα line at 525 eV. This is close to the lower edge of the water-window, a spectral region lacking simple laboratory sources. In the hard x-ray regime electronimpact microfocus sources have matured and are simple, stable, reliable, and inexpensive. It would be beneficial if this source concept could be used also for soft x-ray generation.  

Spectral measurements of a 120 W, 30 keV electron beam focused on a 20 μm water jet show an x-ray intensity of up to 3.2 × 1012 ph/(s×sr×line). Combined with source size measurements up to 50 W a maximum brightness of 3.5 × 109 ph/(s×μm2×sr×line) is reported. This makes the brightness comparable to the compact discharge-plasma sources presently used for soft x-ray microscopy. The source appears to be scalable another order of magnitude which would make the brightness equal to that of the laser-plasma sources.

 

Place, publisher, year, edition, pages
Stockholm: Universitetsservice US AB, 2010. xiii, 37 p.
Series
Trita-FYS, ISSN 0280-316X ; 2010:68
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-28622 (URN)978-91-7415-825-0 (ISBN)
Presentation
2010-12-10, Sal FB42, KTH, Roslagstullsbacken 21, AlbaNova, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20110119Available from: 2011-01-19 Created: 2011-01-18 Last updated: 2012-04-02Bibliographically approved

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Lundström, UlfVogt, UlrichHertz, Hans M.

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