The positron microprobe at LLNL

Analytical methods using a positron microprobe.

Positrons have been used for material analysis not only because of their novel characteristics, such as an ability to detect open-volume type defects in materials, but also because interactions with solids differ from those of electrons in such processes as scattering and diffraction. Monoenergetic positron beams and microbeams were developed in the 1980s, and positron experiments have made pro...

Ams Measurement of Atmospheric Co2 at Llnl

Development of radiocarbon analysis with precision better than 2‰ has the potential to expand the utility of CO2 measurements for carbon cycle investigations as atmospheric gradients currently approach the typical measurement precision of 2–5‰. The accelerator mass spectrometer at Lawrence Livermore National Laboratory (LLNL) produces high and stable beam currents that enable efficient acquisit...

Compton scattering sources and applications at LLNL

We report the design and current status of a monoenergetic laser-based Compton scattering 0.5-2.5 MeV -ray source. Previous nuclear resonance fluorescence results and future linac and laser developments for the source are presented.

Production of a positron microprobe using a transmission remoderator.

A production method for a positron microprobe using a beta+-decay radioisotope (22Na) source has been investigated. When a magnetically guided positron beam was extracted from the magnetic field, the combination of an extraction coil and a magnetic lens enabled us to focus the positron beam by a factor of 10 and to achieve a high transport efficiency (71%). A 150-nm-thick Ni(100) thin film was ...

' . Diagnostic Development at LLNL for the National Ignition Facility