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A Liquid-Metal-Jet Anode X-Ray Tube
KTH, Superseded Departments, Physics.
KTH, Superseded Departments, Physics.
KTH, Superseded Departments, Physics.ORCID iD: 0000-0003-2723-6622
2004 (English)In: Optical Engineering: The Journal of SPIE, ISSN 0091-3286, E-ISSN 1560-2303, Vol. 43, no 7, 1682-1688 p.Article in journal (Refereed) Published
Abstract [en]

We describe a novel electron-impact x-ray source based on a high-speed liquid-metal-jet anode. Thermal power load calculations indicate that this new anode concept potentially could increase the achievable brightness in compact electron-impact x-ray sources by more than a factor 100 compared to current state-of-the-art rotating-anode or microfocus sources. A first, successful, low-power proof-of-principle experiment is described and the feasibility of scaling to high-brightness and high-power operation is discussed. Some possible applications that would benefit from such an increase in brightness are also briefly

Place, publisher, year, edition, pages
2004. Vol. 43, no 7, 1682-1688 p.
Keyword [en]
brightness, X-ray source, electron-impact, liquid-metal jet
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-5835DOI: 10.1117/1.1737787ISI: 000222641200028Scopus ID: 2-s2.0-4143078120OAI: oai:DiVA.org:kth-5835DiVA: diva2:10347
Note
QC 20100915 QC 20111101. Conference on Laser-Generated and Other Laboratory X-Ray and EUV Sources, Optics, and Applications. San Diego, CA. AUG 04-06, 2003 Available from: 2006-05-30 Created: 2006-05-30 Last updated: 2017-12-14Bibliographically approved
In thesis
1. A Compact High-Brightness Liquid-Metal-Jet X-Ray Source
Open this publication in new window or tab >>A Compact High-Brightness Liquid-Metal-Jet X-Ray Source
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis describes the development and characterization of a compact high-brightness liquid-metal-jet anode x-ray source. Initial calculations show that a source based on this concept could potentially lead to a >100-fold increase of the brightness compared to current state-of-the-art rotating-anode x-ray sources. This improvement is due to an increased thermal load capacity of the anode.

A low-power proof-of-principle source has been built, and experiments show that the liquid-metal-jet anode can be operated at more than an order of magnitude higher power densities than modern solid-metal anodes. This brightness enhancement has been utilized to acquire in-line phase-contrast images of weakly absorbing objects with substantially shorter exposure times than previously reported. To be able to target different application areas different liquid-jet-anode materials have been tested. The Sn-jet anode could potentially be used in mammography examinations, whereas the Ga-jet could be utilized for, e.g., protein-structure determination with x-ray diffraction.

Scaling to higher power and brightness levels is discussed and seems conceivable. A potential obstacle for further development of this source concept, the generation of a microscopic high-speed liquid-metal jet in vacuum, is investigated and is proven to be feasible. Dynamic-similarity experiments using water jets to simulate 30-μm, ~500-m/s tin and gallium jets show good coherence and directional stability of the jet. Other potential difficulties in the further source development, such as excessive debris emission and instabilities of the x-ray emission spot, are also investigated in some detail.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006. xii, 61 p.
Series
Trita-FYS, ISSN 0280-316X ; 2006:36
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-4005 (URN)91-7178-371-7 (ISBN)
Public defence
2006-06-09, Sal D3, Lindstedtsvägen 5, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20100915Available from: 2006-05-30 Created: 2006-05-30 Last updated: 2010-09-15Bibliographically approved

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Hertz, Hans M.

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