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Characterisation and application of a laser-based hard x-ray source

Grätz, Matthias LU (1998) In Lund Reports in Atomic Physics LRAP-236.
Abstract
Hard X-rays are generated by focusing 110 fs laser pulses with intensities of about 10<sup>17</sup> W·cm<sup>-2</sup> onto solid metal targets. Characteristic properties of this X-ray source are the small source size, the short pulse duration and the high peak flux. The aim of the present work was to characterise this X-ray source and to demonstrate possible applications. A comparison with other X-ray sources and conventional imaging techniques is made.



Characterising measurements were performed, including source size, emission spectrum, temporal behaviour, source stability and the influence of various laser parameters. The emission spectrum was measured using both energy-dispersive solid-state... (More)
Hard X-rays are generated by focusing 110 fs laser pulses with intensities of about 10<sup>17</sup> W·cm<sup>-2</sup> onto solid metal targets. Characteristic properties of this X-ray source are the small source size, the short pulse duration and the high peak flux. The aim of the present work was to characterise this X-ray source and to demonstrate possible applications. A comparison with other X-ray sources and conventional imaging techniques is made.



Characterising measurements were performed, including source size, emission spectrum, temporal behaviour, source stability and the influence of various laser parameters. The emission spectrum was measured using both energy-dispersive solid-state detectors and wavelength-dispersive crystal spectroscopy. The conversion efficiency from laser light to X-ray radiation was measured for different target materials. The laser ablation from different targets was studied.



The feasibility of special imaging techniques, e.g. differential imaging and time-gated imaging, was investigated both theoretically and experimentally. Differential imaging allows for selective imaging of contrast agents, while time-gated imaging can reduce the influence of scattered radiation in X-ray imaging. Time-gated imaging was demonstrated in different imaging geometries, both for planar imaging and computed tomography imaging. Reasonable agreement between theoretically calculated values and experimental results was obtained. (Less)
Please use this url to cite or link to this publication:
author
supervisor
opponent
  • Prof Sandner, Wolfgang, Max-Born-Institut, Berlin, Germany
organization
publishing date
type
Thesis
publication status
published
subject
keywords
X-ray spectroscopy, radiography, medical imaging, differential imaging, time-gated imaging, scatter reduction, Monte Carlo simulation, Atomic and molecular physics, computed tomography, Fysicumarkivet A:1998:Grätz, laser-produced plasma, Atom- och molekylärfysik, X-ray sources
in
Lund Reports in Atomic Physics
volume
LRAP-236
pages
151 pages
publisher
Department of Physics, Lund University
defense location
Lecture hall B, Department of Physics, Sölvegatan 14, Lund, Sweden
defense date
1998-11-06 10:15
external identifiers
  • Other:ISRN: LUTFD2/(TFAF-1038)/1-79/(1988)
ISBN
91-628-3136-4
language
English
LU publication?
yes
id
3f1e6300-7db4-4a27-b10a-cccf3494f1ed (old id 39068)
date added to LUP
2007-06-21 10:48:30
date last changed
2016-09-19 08:45:12
@phdthesis{3f1e6300-7db4-4a27-b10a-cccf3494f1ed,
  abstract     = {Hard X-rays are generated by focusing 110 fs laser pulses with intensities of about 10&lt;sup&gt;17&lt;/sup&gt; W·cm&lt;sup&gt;-2&lt;/sup&gt; onto solid metal targets. Characteristic properties of this X-ray source are the small source size, the short pulse duration and the high peak flux. The aim of the present work was to characterise this X-ray source and to demonstrate possible applications. A comparison with other X-ray sources and conventional imaging techniques is made.<br/><br>
<br/><br>
Characterising measurements were performed, including source size, emission spectrum, temporal behaviour, source stability and the influence of various laser parameters. The emission spectrum was measured using both energy-dispersive solid-state detectors and wavelength-dispersive crystal spectroscopy. The conversion efficiency from laser light to X-ray radiation was measured for different target materials. The laser ablation from different targets was studied.<br/><br>
<br/><br>
The feasibility of special imaging techniques, e.g. differential imaging and time-gated imaging, was investigated both theoretically and experimentally. Differential imaging allows for selective imaging of contrast agents, while time-gated imaging can reduce the influence of scattered radiation in X-ray imaging. Time-gated imaging was demonstrated in different imaging geometries, both for planar imaging and computed tomography imaging. Reasonable agreement between theoretically calculated values and experimental results was obtained.},
  author       = {Grätz, Matthias},
  isbn         = {91-628-3136-4},
  keyword      = {X-ray spectroscopy,radiography,medical imaging,differential imaging,time-gated imaging,scatter reduction,Monte Carlo simulation,Atomic and molecular physics,computed tomography,Fysicumarkivet A:1998:Grätz,laser-produced plasma,Atom- och molekylärfysik,X-ray sources},
  language     = {eng},
  pages        = {151},
  publisher    = {Department of Physics, Lund University},
  school       = {Lund University},
  series       = {Lund Reports in Atomic Physics},
  title        = {Characterisation and application of a laser-based hard x-ray source},
  volume       = {LRAP-236},
  year         = {1998},
}