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Presents a study that reported a series of spectrally resolved measurements on an argon plasma produced using a gas puff load driven by a high-power electron. Effects of mass motion Doppler shifts on the spectra; Measurement of systematic blue shifts of line positions in the source when viewed axially; Discussion on how the spectral lines classified in the study can be used to measure the density and velocity of the imploding plasma in the gas puff z pinch.

A relationship linking the saturation momentum in the case of fixed and running QCD coupling, respectively, is derived from the Balitsky-Kovchegov equation. It relies on the linear instability of the evolution equation in the dilute regime. The relationship can also be derived for the Balitsky-Kovchegov equation with a cutoff accounting for low-density effects. [ABSTRACT FROM AUTHOR]

An electron-beam ion trap (EBIT) has just been completed in the Clarendon Laboratory, Oxford. The design is similar to the devices installed at the Lawrence Livermore National Laboratory. It is intended that the Oxford EBIT will be used for x-ray and UV spectroscopy of hydrogenic and helium-like ions, laser resonance spectroscopy of hydrogenic ions and measurements of dielectronic recombination cross sections, in order to test current understanding of simple highly charged ions. [ABSTRACT FROM AUTHOR]

We study the effect of mass on geometric descriptions of gauge field theories. In an approach in which the massless theory resembles general relativity, the introduction of the mass entails non-zero torsion and the generalization to Einstein-Cartan-Sciama-Kibble theories. The relationships to pure torsion formulations (teleparallel gravity) and to higher gauge theories are also discussed. [ABSTRACT FROM AUTHOR]