Abstract
A centimeter-scale field of view for transmission X-ray radiography from a sub-millimeter-focused synchrotron X-ray beam is achieved by placing a strongly scattering material upstream of the sample. Combining the scattered beam with a detector system synchronized and gated to acquire images from single X-ray pulses provides the capability for time-resolved observations of transient phenomena in samples larger than the native X-ray beam. Furthermore, switching between this scatter-beam imaging (SBI) and scattering modes is trivial compared to switching between unfocused white beam imaging and scattering using a focused pink beam. As a result, SBI additionally provides a straightforward method to precisely align samples relative to the focused X-ray beam for subsequent small-angle X-ray scattering measurements. This paper describes the use of glassy carbon for SBI to observe phenomena during detonation of small-scale high explosive charges and compares the technique to conventional white beam imaging. SBI image sequences from ideal versus non-ideal explosive materials provide insights into the evolution of dead zones of the undetonated material, while tomographic reconstructions of radiographs acquired as the detonation front traverses the explosive charge can provide a means for estimating the density at and behind the detonation front.
| Original language | English |
|---|---|
| Article number | 225902 |
| Journal | Journal of Applied Physics |
| Volume | 123 |
| Issue number | 22 |
| DOIs | |
| State | Published - Jun 14 2018 |
| Externally published | Yes |
Funding
This work was funded at its initial stages by LLNL LDRD 14-ERD-018 and at its latter stages by NNSA's Office of Defense and Nuclear Nonproliferation and Science Campaign 2 and performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract No. DE-AC52-07NA27344. M. H. Nielsen acknowledges additional support from the Lawrence Fellowship at LLNL. The Dynamic Compression Sector at the Advanced Photon Source (DCS@APS) is managed by Washington State University and funded by the National Nuclear Security Administration of the U.S. Department of Energy under Cooperative Agreement No. DE-NA0002442. We thank particularly S. Bastea for insightful discussions. We also acknowledge C. May, P. Pagoria, and the HEAF staff at LLNL, and B. Jensen, D. Dattelbaum, and M. Firestone of LANL. This work was funded at its initial stages by LLNL LDRD 14-ERD-018 and at its latter stages by NNSA’s Office of Defense and Nuclear Nonproliferation and Science Campaign 2 and performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract No. DE-AC52-07NA27344. M. H. Nielsen acknowledges additional support from the Lawrence Fellowship at LLNL. The Dynamic Compression Sector at the Advanced Photon Source (DCS@APS) is managed by Washington State University and funded by the National Nuclear Security Administration of the U.S. Department of Energy under Cooperative Agreement No. DE-NA0002442. This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by the Argonne National Laboratory under Contract No. DE-AC02-06CH11357. The authors are grateful for the support from beamline staff at beamlines 9-ID, 35-ID, and LLNL-JRNL-741424.