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Users Week 2009
May 4-6, 2009

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Workshop 4:
High-speed Imaging Opportunities with X-rays

Organizers: Kamel Fezzaa, Wah-Keat Lee, and Jin Wang (all APS)

Date: Wednesday, May 6, 2009

Room: Bldg. 402, Room E1100/E1200


High-speed imaging with visible light is a well-established technique. However, in many cases, visible light has severe limitations due to reflection, refraction, and multiple scattering. Especially in optically dense systems, visible light lacks penetration ability as opposed to X-rays.

Synchrotron-based ultra-high-speed X-ray imaging is being developed at the APS, utilizing the unique parameters of this source. It is proving to be a unique and invaluable tool to image the internal structures of optically opaque systems with micrometer spatial resolution and sub-nanosecond temporal resolution. Currently, we can take X-ray edge-enhanced images of fuel jets with 100-ps exposure times, see the motion of the internal parts of a stainless steel fuel injector, and make X-ray movies of the pinch-off singularity water droplets, all at a rate of tens of thousands of frames per second.

The fundamental insights this technique can provide are not otherwise possible and are much needed in many research areas dealing with ultra-fast and transient phenomena. Examples include dynamics of multiphase flows; materials behavior under extreme conditions, such as impact or explosion; complex materials mechanics; self-propagating reactions in multi-component systems; and many other applications that are of major importance to transportation safety, national security, energy efficiency, emissions control, and development of new materials.

To promote the science that can be facilitated with the ultrafast technique at the APS, the goals of this one-day workshop are (1) to present the current capabilities this nascent technique, (2) to examine its applicability and explore its utility to existing unsolved scientific questions in a much broader community, and (3) to discuss new possibilities and identify directions for future developments.

Agenda

8:55 – 9:05

Welcome and Introductory Remarks
Organizers
 
9:05 – 9:35  Current State of X-ray High-speed Imaging at the APS
Kamel Fezzaa, Advanced Photon Source
 
9:35 – 10:15 Current Challenges and Potential Application of High-speed X-ray Imaging to the Investigation of Solidification and Crystallization Dynamics
Ralph Napolitano, Iowa State University
 
10:15 – 10:35 Coffee break

 
10:35 – 11:15 Life and Death of a Drop:  What We Can Learn about Dynamic Singularities?
Sidney Nagel, University of Chicago
 
11:15 – 11:55  Gas-mediated Impact Dynamics on a Fine-grained Granular Bed
John Royer, University of Chicago
 
11:55 – 1:20 Lunch
 
1:20 – 2:00  Correlating the Spray Primary Breakup Process for DI Automotive Injectors to Their Design
Ming-Chia Lai, Wayne State University, Michigan
 
2:00 – 2:40 Study of Diesel Spray Primary Breakup
Rolf Reitz, University of Wisconsin, Madison
 
2:40 – 3:20  Fracture and Friction at Microscopic and Macroscopic Scales
Michael Marder, University of Texas, Austin
 
3:20 – 3:40 Coffee break

 
3:40 – 4:20   Investigation of Dynamic Failures in Metals using High-speed Photography and Infrared Thermograph
Guruswami Ravichandran, California Institute of Technology
 
4:20-4:30 Discussion and Adjourn

 

 
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