|
Thermo reflectance bolometry
An approach to bolometry has been developed. It is based on the measurements of optical reflectivity change of a thin metal layer deposited on a transparent substrate. The reflectivity change results from the temperature rise due to absorption of energetic particles or x rays. The sensor of the bolometer has no ohmic contact with the measuring unit, making this method well suited for an environment with strong electromagnetic noise interference. The technique was applied to characterize a method for the generation of intense electron beams in a dense gas. Very high efficiency for the e-beam generation (up to 95%) was measured.
APL 2003
An electron beam source based on a dielectric barrier discharge and a perforated anode working in a dense gas is described. Electron beams with current densities up to 60 A/cm2 and pulse durations of 150 ns were generated. Stable operation of the device at a repetition frequency of 200 Hz has been demonstrated.
Statistical properties of radiation from a group of electrons
The statistical properties of a radiation spectrum from an electron bunch of arbitrary shape are considered. The kinetic equation for the probability density of the complex vector of total radiation field is derived and solved. The simple way to obtain the moments of the first two orders is presented. Average spectral intensity and its fluctuation are calculated without restrictions to the number of particles in the bunch.
|
