scholarly journals High brightness laser–plasma X-ray source at IFAM: Characterization and applications

2000 ◽  
Vol 18 (1) ◽  
pp. 109-118 ◽  
Author(s):  
S. MARZI ◽  
A. GIULIETTI ◽  
D. GIULIETTI ◽  
L.A. GIZZI ◽  
A. SALVETTI
Keyword(s):  
Laser Plasma ◽  
Atmospheric Pressure ◽  
Single Shot ◽  
High Brightness ◽  
X Ray ◽  
Wide Range ◽  
Flux Intensity ◽  
Long Time ◽  
Resolution Imaging ◽  
Set Up

A high brightness laser-plasma X-ray source has been set-up and is presently available at IFAM. A wide range of diagnostics has been set up to monitor the properties of the X-ray radiation and to control the main parameters including photon energy, flux intensity, and pulse duration. A beam extractor enables access to the X-ray radiation at atmospheric pressure. A simple, easy-to-use projection microscope has been built which is capable of single-shot micron resolution imaging with digital acquisition. Preliminary biomedical experiments show that the X-ray doses available on a single laser shot exposure of our source fully meet the conditions required for an important class of biological experiments based on X-ray induced DNA damage providing an ideal alternative to the long time exposures needed with X-ray tubes.

Alternative edge illumination set-up for single-shot X-ray phase contrast imaging

2018 ◽  
Vol 124 (16) ◽  
pp. 164906 ◽  
Author(s):  
Cui Zhang ◽  
Xiaodong Pan ◽  
Hongjie Shang ◽  
Gongping Li
Keyword(s):  
Phase Contrast ◽  
Phase Contrast Imaging ◽  
Single Shot ◽  
Contrast Imaging ◽  
X Ray ◽  
Set Up

A scanning Kelvin probe for synchrotron investigations: thein situdetection of radiation-induced potential changes

2011 ◽  
Vol 19 (1) ◽  
pp. 48-53 ◽  
Author(s):  
Bekir Salgin ◽  
Dirk Vogel ◽  
Diego Pontoni ◽  
Heiko Schröder ◽  
Bernd Schönberger ◽  
...  
Keyword(s):  
High Performance ◽  
Structural Changes ◽  
Kelvin Probe ◽  
X Ray ◽  
Scanning Kelvin Probe ◽  
Wide Range ◽  
First Results ◽  
Radiation Induced ◽  
Set Up

A wide range of high-performance X-ray surface/interface characterization techniques are implemented nowadays at every synchrotron radiation source. However, these techniques are not always `non-destructive' because possible beam-induced electronic or structural changes may occur during X-ray irradiation. As these changes may be at least partially reversible, anin situtechnique is required for assessing their extent. Here the integration of a scanning Kelvin probe (SKP) set-up with a synchrotron hard X-ray interface scattering instrument for thein situdetection of work function variations resulting from X-ray irradiation is reported. First results, obtained on bare sapphire and sapphire covered by a room-temperature ionic liquid, are presented. In both cases a potential change was detected, which decayed and vanished after switching off the X-ray beam. This demonstrates the usefulness of a SKP forin situmonitoring of surface/interface potentials during X-ray materials characterization experiments.

scholarly journals Magnetic fields in O-type stars measured with FORS 1 at the VLT

2008 ◽  
Vol 4 (S259) ◽  
pp. 381-382
Author(s):  
Swetlana Hubrig ◽  
M. Schöller ◽  
R. S. Schnerr ◽  
I. Ilyin ◽  
H. F. Henrichs ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Massive Stars ◽  
Emission Lines ◽  
X Ray ◽  
Wind Variability ◽  
Thermal Radio ◽  
Wide Range ◽  
Long Time ◽  
Hα Emission ◽  
Chemical Peculiarity

AbstractThe presence of magnetic fields in O-type stars has been suspected for a long time. The discovery of such fields would explain a wide range of well documented enigmatic phenomena in massive stars, in particular cyclical wind variability, Hα emission variations, chemical peculiarity, narrow X-ray emission lines and non-thermal radio/X-ray emission. Here we present the results of our studies of magnetic fields in O-type stars, carried out over the last years.

Time- and spatial-resolved XAFS spectroscopy in a single shot: new analytical possibilities forin situmaterial characterization

2016 ◽  
Vol 23 (3) ◽  
pp. 769-776 ◽  
Author(s):  
Ana Guilherme Buzanich ◽  
Martin Radtke ◽  
Uwe Reinholz ◽  
Heinrich Riesemeier ◽  
Franziska Emmerling
Keyword(s):  
Ccd Camera ◽  
Single Shot ◽  
Transmitted Beam ◽  
X Ray ◽  
Structure Information ◽  
Xafs Spectroscopy ◽  
Area Detector ◽  
Metal Foils ◽  
Set Up ◽  
X Ray Absorption

A new concept that comprises both time- and lateral-resolved X-ray absorption fine-structure information simultaneously in a single shot is presented. This uncomplicated set-up was tested at the BAMline at BESSY-II (Berlin, Germany). The primary broadband beam was generated by a double multilayer monochromator. The transmitted beam through the sample is diffracted by a convexly bent Si (111) crystal, producing a divergent beam. This, in turn, is collected by either an energy-sensitive area detector, the so-called color X-ray camera, or by an area-sensitive detector based on a CCD camera, in θ–2θ geometry. The first tests were performed with thin metal foils and some iron oxide mixtures. A time resolution of lower than 1 s together with a spatial resolution in one dimension of at least 50 µm is achieved.

scholarly journals Low-emittance electron bunches from a laser-plasma accelerator measured using single-shot X-ray spectroscopy

2013 ◽  
Author(s):  
C. G. R. Geddes ◽  
G. R. Plateau ◽  
D. B. Thorn ◽  
M. Chen ◽  
C. Benedetti ◽  
...  
Keyword(s):  
Laser Plasma ◽  
Plasma Accelerator ◽  
Single Shot ◽  
X Ray ◽  
Electron Bunches ◽  
Laser Plasma Accelerator ◽  
Low Emittance

scholarly journals Single-Shot near Edge X-ray Fine Structure (NEXAFS) Spectroscopy Using a Laboratory Laser-Plasma Light Source

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1303 ◽  
Author(s):  
Przemysław Wachulak ◽  
Martin Duda ◽  
Tomasz Fok ◽  
Andrzej Bartnik ◽  
Zhanshan Wang ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Fine Structure ◽  
Absorption Spectra ◽  
Light Source ◽  
Laser Plasma ◽  
Nanosecond Laser Pulse ◽  
Nanosecond Laser ◽  
Single Shot ◽  
X Ray ◽  
Nexafs Spectroscopy

We present a proof of principle experiment on single-shot near edge soft X-ray fine structure (NEXAFS) spectroscopy with the use of a laboratory laser-plasma light source. The source is based on a plasma created as a result of the interaction of a nanosecond laser pulse with a double stream gas puff target. The laser-plasma source was optimized for efficient soft X-ray (SXR) emission from the krypton/helium target in the wavelength range from 2 nm to 5 nm. This emission was used to acquire simultaneously emission and absorption spectra of soft X-ray light from the source and from the investigated sample using a grazing incidence grating spectrometer. NEXAFS measurements in a transmission mode revealed the spectral features near the carbon K-α absorption edge of thin polyethylene terephthalate (PET) film and L-ascorbic acid in a single-shot. From these features, the composition of the PET sample was successfully obtained. The NEXAFS spectrum of the L-ascorbic acid obtained in a single-shot exposure was also compared to the spectrum obtained a multi-shot exposure and to numerical simulations showing good agreement. In the paper, the detailed information about the source, the spectroscopy system, the absorption spectra measurements and the results of the studies are presented and discussed.

scholarly journals Compact x-ray microscope for the water window based on a high brightness laser plasma source

2012 ◽  
Vol 20 (16) ◽  
pp. 18362 ◽  
Author(s):  
H. Legall ◽  
G. Blobel ◽  
H. Stiel ◽  
W. Sandner ◽  
C. Seim ◽  
...  
Keyword(s):  
Laser Plasma ◽  
Plasma Source ◽  
High Brightness ◽  
X Ray ◽  
Water Window

scholarly journals Weak Activity of Haloalkane Dehalogenase LinB with 1,2,3-Trichloropropane Revealed by X-Ray Crystallography and Microcalorimetry

2007 ◽  
Vol 73 (6) ◽  
pp. 2005-2008 ◽  
Author(s):  
Marta Monincová ◽  
Zbyněk Prokop ◽  
Jitka Vévodová ◽  
Yuji Nagata ◽  
Jiří Damborský
Keyword(s):  
Analytical Methods ◽  
Halogen Bond ◽  
Universal Method ◽  
Haloalkane Dehalogenase ◽  
X Ray ◽  
X Ray Crystallography ◽  
Wide Range ◽  
Long Time ◽  
Organic Halogenated Compounds ◽  
Weak Activity

ABSTRACT 1,2,3-Trichloropropane (TCP) is a highly toxic and recalcitrant compound. Haloalkane dehalogenases are bacterial enzymes that catalyze the cleavage of a carbon-halogen bond in a wide range of organic halogenated compounds. Haloalkane dehalogenase LinB from Sphingobium japonicum UT26 has, for a long time, been considered inactive with TCP, since the reaction cannot be easily detected by conventional analytical methods. Here we demonstrate detection of the weak activity (k cat = 0.005 s−1) of LinB with TCP using X-ray crystallography and microcalorimetry. This observation makes LinB a useful starting material for the development of a new biocatalyst toward TCP by protein engineering. Microcalorimetry is proposed to be a universal method for the detection of weak enzymatic activities. Detection of these activities is becoming increasingly important for engineering novel biocatalysts using the scaffolds of proteins with promiscuous activities.

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