scholarly journals K-alpha x-ray source using high energy and high repetition rate laser system for phase contrast imaging

2009 ◽  
Author(s):  
Cristina Serbanescu ◽  
Sylvain Fourmaux ◽  
Jean-Claude Kieffer ◽  
Russell Kincaid ◽  
Andrzej Krol
Keyword(s):  
Repetition Rate ◽  
Phase Contrast ◽  
Laser System ◽  
High Energy ◽  
High Repetition Rate ◽  
Phase Contrast Imaging ◽  
Contrast Imaging ◽  
X Ray ◽  
High Repetition

scholarly journals Evaluation of the Weighted Mean X-ray Energy for an Imaging System Via Propagation-Based Phase-Contrast Imaging

2020 ◽  
Vol 6 (7) ◽  
pp. 63
Author(s):  
Maria Seifert ◽  
Mareike Weule ◽  
Silvia Cipiccia ◽  
Silja Flenner ◽  
Johannes Hagemann ◽  
...  
Keyword(s):  
Phase Contrast ◽  
Heavy Ion ◽  
High Energy ◽  
Phase Contrast Imaging ◽  
Single Shot ◽  
Contrast Imaging ◽  
Weighted Mean ◽  
X Ray ◽  
Energy Laser ◽  
High Energy Laser

For imaging events of extremely short duration, like shock waves or explosions, it is necessary to be able to image the object with a single-shot exposure. A suitable setup is given by a laser-induced X-ray source such as the one that can be found at GSI (Helmholtzzentrum für Schwerionenforschung GmbH) in Darmstadt (Society for Heavy Ion Research), Germany. There, it is possible to direct a pulse from the high-energy laser Petawatt High Energy Laser for Heavy Ion eXperiments (PHELIX) on a tungsten wire to generate a picosecond polychromatic X-ray pulse, called backlighter. For grating-based single-shot phase-contrast imaging of shock waves or exploding wires, it is important to know the weighted mean energy of the X-ray spectrum for choosing a suitable setup. In propagation-based phase-contrast imaging the knowledge of the weighted mean energy is necessary to be able to reconstruct quantitative phase images of unknown objects. Hence, we developed a method to evaluate the weighted mean energy of the X-ray backlighter spectrum using propagation-based phase-contrast images. In a first step wave-field simulations are performed to verify the results. Furthermore, our evaluation is cross-checked with monochromatic synchrotron measurements with known energy at Diamond Light Source (DLS, Didcot, UK) for proof of concepts.

scholarly journals A method for high-energy, low-dose mammography using edge illumination x-ray phase-contrast imaging

2016 ◽  
Vol 61 (24) ◽  
pp. 8750-8761 ◽  
Author(s):  
Paul C Diemoz ◽  
Alberto Bravin ◽  
Anikó Sztrókay-Gaul ◽  
Marie Ruat ◽  
Susanne Grandl ◽  
...  
Keyword(s):  
Phase Contrast ◽  
Low Dose ◽  
High Energy ◽  
Phase Contrast Imaging ◽  
Contrast Imaging ◽  
X Ray

scholarly journals Double sided grating fabrication for high energy X-ray phase contrast imaging

2019 ◽  
Vol 92 ◽  
pp. 86-90 ◽  
Author(s):  
Andrew E. Hollowell ◽  
Christian L. Arrington ◽  
Patrick Finnegan ◽  
Kate Musick ◽  
Paul Resnick ◽  
...  
Keyword(s):  
Phase Contrast ◽  
High Energy ◽  
Phase Contrast Imaging ◽  
Contrast Imaging ◽  
X Ray ◽  
Grating Fabrication

X-Ray Phase Contrast Imaging of Liquid Film and Spray Development Inside an Aircraft Engine Swirler

2019 ◽  
Vol 141 (12) ◽  
Author(s):  
Brandon A. Sforzo ◽  
Alan L. Kastengren ◽  
Katarzyna E. Matusik ◽  
Felipe Gomez del Campo ◽  
Christopher F. Powell
Keyword(s):  
Liquid Film ◽  
High Speed ◽  
Phase Contrast ◽  
Air Flow ◽  
High Energy ◽  
Phase Contrast Imaging ◽  
Contrast Imaging ◽  
Spray Cone ◽  
Validation Data ◽  
X Ray

Abstract Modern aircraft engines combine liquid fuel and air using an intricate flow device with many fuel and air flow passages. To date, the process by which the fuel atomizes within this swirler set has not been examined directly due to optical access limitations. In this work, high-speed X-ray phase-contrast imaging of a liquid spray inside a gas turbine engine swirler geometry is presented. Measurements were carried out at the 7-BM beamline of the Advanced Photon Source at Argonne National Laboratory using the high-energy broadband X-ray beam. The synchrotron X-ray source provides the necessary photon energy and flux to capture time-resolved fluid phenomena within the confines of the relevant geometry while liquid and air are flowing. Spray nozzle hardware and geometries were provided by the National Jet Fuels Combustion Program (NJFCP), allowing for characterization of the spray using a commercially relevant configuration. Modified swirlers were three-dimensional printed with acrylic to improve imaging access while maintaining influential internal features. Water was used as a surrogate fluid for these studies to demonstrate the visualization capabilities. The experiments were conducted at atmospheric exit pressure conditions with a pressure drop of 6% across the swirler. High-speed imaging of the pilot spray cone revealed sheet breakup several millimeters downstream of the orifice exit, upon interaction with the radial assist air flow. These droplets and ligaments were observed to impinge on the inner filming surface of the swirler and flow toward the exit while developing a tangential flow. Under these conditions, the liquid film grows up to several hundred microns in thickness on the filming surface, and subsequently forms ligaments up to several millimeters in length before breaking up. This work demonstrates the capability of X-ray diagnostics in visualizing liquid flows within solid geometries of technical relevance. Furthermore, the spatial quantification of filming flows and liquid interaction with the swirler air provides validation data for modeling of the multiphase flows and surface interactions within the swirler.

Coded apertures allow high-energy x-ray phase contrast imaging with laboratory sources

2011 ◽  
Vol 110 (1) ◽  
pp. 014906 ◽  
Author(s):  
K. Ignatyev ◽  
P. R. T. Munro ◽  
D. Chana ◽  
R. D. Speller ◽  
A. Olivo
Keyword(s):  
Phase Contrast ◽  
High Energy ◽  
Phase Contrast Imaging ◽  
Contrast Imaging ◽  
X Ray ◽  
Coded Apertures

scholarly journals Advanced 20 TW Ti:S laser system for X-ray laser and coherent XUV generation irradiated by ultra-high intensities

2005 ◽  
Vol 23 (2) ◽  
pp. 183-186 ◽  
Author(s):  
HIROTO KURODA ◽  
MASAYUKI SUZUKI ◽  
RASHID GANEEV ◽  
JUN ZHANG ◽  
MOTOYOSHI BABA ◽  
...  
Keyword(s):  
Repetition Rate ◽  
Laser Energy ◽  
Laser System ◽  
Contrast Ratio ◽  
High Repetition Rate ◽  
Collisional Excitation ◽  
Center Wavelength ◽  
X Ray ◽  
High Repetition ◽  
Nd:Glass Laser

In order to develop a high repetition rate X-ray lasers, the longitudinal-pumped transient collisional excitation (TCE) X-ray laser is one of the most effective pumping schemes. The high directive Ni-like Mo 18.9 nm soft X-ray laser pumped by modest laser energy has already been demonstrated by using the tabletop size Ti:sapphire/Nd:glass laser system that delivering energy of 150 mJ in 475 fs at the center wavelength of 1054 nm. The total energy in the pre-pulse and the main pulse was 150 mJ, which will make possible multi-hertz operation. To pursue the high repetition rate of the laser-driven TCE X-ray laser, we have designed a new 20 TW Ti:Sapphire laser system (600 mJ, 30 fs, 10 Hz). Special attention was paid to improve the contrast ratio, control of pulse shape as well as phase by an acoustic optic programmable dispersive filter (AOPDF) and 1 kHz preamplifier. Preliminary data have shown good laser characteristics. As the preliminary experiments, we have investigated high order harmonics generation from low-density laser plasma by using the solid target irradiated by a femtosecond laser pulse. The highest order was the 51st. harmonic at wavelength of 15.61 nm.

Design of a compact high-energy setup for x-ray phase-contrast imaging

2014 ◽  
Author(s):  
Markus Schüttler ◽  
Andre Yaroshenko ◽  
Martin Bech ◽  
Guillaume Potdevin ◽  
Andreas Malecki ◽  
...  
Keyword(s):  
Phase Contrast ◽  
High Energy ◽  
Phase Contrast Imaging ◽  
Contrast Imaging ◽  
X Ray

Design and demonstration of a high-energy booster amplifier for a high-repetition rate petawatt class laser system

2007 ◽  
Vol 32 (3) ◽  
pp. 238 ◽  
Author(s):  
Fabien Ple ◽  
Moana Pittman ◽  
Gerard Jamelot ◽  
Jean-Paul Chambaret
Keyword(s):  
Repetition Rate ◽  
Laser System ◽  
High Energy ◽  
High Repetition Rate ◽  
High Repetition
Sign in / Sign up

Export Citation Format

Share Document