Measurements of Electron Drift Velocity in ³He Gas

Abstract

Shearography is a full-field interferometric speckle technique used to determine displacement derivatives. Measurement of surface strain is possible using shearography if six components of displacement gradient are calculated. This can be achieved using shearography instrumentation that incorporates at least three measurement channels combined with two orthogonal shear directions. This paper presents a laser shearography instrument that utilizes coherent imaging fibre bundles to port four spatially multiplexed speckle images to a single CCD camera via a shearing Michelson interferometer. The four images are spatially multiplexed onto the sensor of a CCD camera. Wrapped phase maps are derived from the recorded speckle interferograms using temporal phase stepping. The unwrapped phase maps are combined with the measurement channel sensitivity vectors using a matrix operation to determine the required displacement derivatives. Results from an out-of-plane displacement of a flat aluminium plate are presented and compared with a computational model. Results from a second test object that show in-plane and out-of-plane strain components are also shown.

Measurement and interpretation of swarm parameters and their application in plasma modelling

“…Low temperature drift velocities were measured in He 3 showing a difference from the standard helium due to a difference in mass especially since in helium energy balance is dominated by recoil at electron energies below 19 eV (Kusano et al 2008). Cross sections for rare gases have been tested in the moderate and higher energy regions ( Šašić et al 2005).…”

Electron Mobility and Longitudinal Diffusion Coefficient in High-Density Gaseous Xenon

“…The analysis of waveforms is similar to in our previous works. 26,30) Figure 3 shows typical averaged waveforms of voltage and current signals. The current signal was obtained by differentiating the voltage signal.…”

Density Dependence of the Longitudinal Diffusion Coefficient of Electrons in Xenon

“…The experimental apparatus is described in detail in previous papers. 4,5,8) Here, we briefly describe the apparatus and data analysis. This investigation was carried out using a parallel plate drift chamber and a xenon flash lamp (XFL; Hamamatsu Photonics L7685).…”