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Raphaelian, Mark

Publications and source records attributed to Raphaelian, Mark.

6 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2016

Multi-Frame X-Ray Imaging Using a Streak Camera with a Patterned Photocathode, LAO-008-16, Year 1 of 2

Presentation describes development of a new time-resolved x-ray imaging system based on compressed ultrafast photography (CUP) to achieve multi-frame imaging for energies in the 1–10 keV range with a frame rate between 1 to 10 frames per nanosecond depending on the sweep time. A patterned gold photocathode was constructed for use with an existing Kentech x-ray streak camera. Significant work in reconstruction algorithms was performed to enable reconstructions of data that are much less sparse. These algorithms were tested with optical streak camera CUP data acquired at Livermore Operations.

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗
DOE OSTI2015

Compressed Time-Resolved X-Ray Imaging

Presentation describes three applications of Compressed Ultrafast Photography (CUP): High-Speed Beam Imaging Diagnostic for Radiography Machines; Compressed Time-Resolved X-ray Imaging; and Compressed Timed All-Optical Mapping Photography.

47 OTHER INSTRUMENTATION↗
DOE OSTI2015

Mirrored low-energy channel for the MiniXRD

X-ray Diodes (XRDs) are currently used for spectroscopic measurements, measuring X-ray flux, and estimating spectral shape of the VUV to soft X-ray spectrum. A niche exists for an inexpensive, robust X-ray diode that can be used for experiments in hostile environments on multiple platforms, including explosively driven experiments that have the potential for destroying the diode during the experiment. A multiple channel stacked filtered array was developed with a small field of view where a wider parallel array could not be used, but filtered channels for energies lower than 1000 eV were too fragile to deploy under normal conditions. To achieve both the robustness and the required low-energy detection ability, the researchers designed a small low-energy mirrored channel with a spectral sensitivity from 30 to 1000 eV. The stacked MiniXRD X-ray diode system design incorporates the mirrored low-energy channel on the front of the stacked filtered channels to allow the system to work within a small field of view. We will present results that demonstrate this is a promising solution for low-energy spectrum measurements.

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗
DOE OSTI2015

Three Dimensional Rotations of the Electroweak Interaction

An extension to the standard electroweak model is presented that is different from previous models. This extension involves a three dimensional rotation of a plane containing two charge-neutral current axes. In this model the plane also contains the quantization axes of the three algebraic SU(2) groups that de ne the SU(3) group. The extension differentiates leptonic currents from baryonic currents through hypercolor-charge channels and predicts additional symmetries and currents due to the nature of the coupling of the three SU(2) groups into a SU(3) group format.

70 PLASMA PHYSICS AND FUSION TECHNOLOGY↗