The transverse dynamics of space-charge dominated beams are investigated both analytically and computationally, in order to understand the mechanisms for emittance oscillations and growth due to nonlinear space-charge fields. This work explores the role of space-charge dominated equilibrium and its relationship to phase space wave breaking, which is responsible for the irreversible emittance gr...

A series of charge compensation investigations on SrS:Cu grown by physical vapor phase are reported. In this study, the trivalent ion, Y, was codoped during SrS growth to substitute on the Sr-site. Although similar EL performance to high temperature annealed sputtered samples was obtained using an annealing temperature of 6508C, our results indicated that the thermal quenching in this material ...

A surface charge compensation electron flood gun has been added to the Lawrence Livermore National Laboratory (LLNL) highly charged ion (HCI) emission microscope. HCI surface interaction results in a significant charge residue being left on the surface of insulators and semiconductors. This residual charge causes undesirable aberrations in the microscope images and a reduction of the time-of-fl...

This paper includes the study of a known very simple reference current source, having two branches, where the temperature-compensation of the sum of branch currents (the total current) is done. This kind of approach is adequate when the reference must supply current in a charge with grounded or connected to voltage supply end. The first-order thermal compensation of the reference current is ana...

Charge is observed in clouds of all forms, which may influence their development and properties. In-cloud charge measurements require a wide dynamic range, extending from charge in aerosols and dusts to that present in thunderstorms. Unexpectedly large charge densities (>200 pC m-3) have recently been detected in layer clouds using balloon-carried linear electrometers. These, however, lead to i...

Density-functional theory calculations reveal that the compensation mechanism at the isolated n-type interface in LaAlO3 /SrTiO3 superlattices involves both ionic and electronic degrees of freedom. Strong polar distortions screen the local electric field and reduce the band discontinuity across the interface. We find that the electronic reconstruction depends sensitively on whether structural o...