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Updated: May 17, 2026

Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
Published on: July 2, 2012
Measuring electron-positron annihilation radiation from laser plasma interactions
Hui Chen1, R Tommasini, J Seely
1Lawrence Livermore National Laboratory, Livermore, California 94551, USA. chen33@llnl.gov
Abstract:
We investigated various diagnostic techniques to measure the 511 keV annihilation radiations. These include step-wedge filters, transmission crystal spectroscopy, single-hit CCD detectors, and streaked scintillating detection. While none of the diagnostics recorded conclusive results, the step-wedge filter that is sensitive to the energy range between 100 keV and 700 keV shows a signal around 500 keV that is clearly departing from a pure Bremsstrahlung spectrum and that we ascribe to annihilation radiation.
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