Among the well known physical methods of thin film preparation as target evaporation by magnetron irradiation, by laser, electron and long pulse ion beams, the method of precipitation of evaporated target material with short pulse ( < 100 ns) and high power (>10 W/cm) ion beam seems to be less investigated. The advantages of such method are: 1. high precipitation velocity ( 1 Jlm per shot); 2. ...

Applying the temporal and spatial Fourier transform method, we obtain a nonparaxial pulsed beam solution, which is based on the paraxial pulsed beam solution, where the nonparaxiality is evaluated by using a series of expansions. Specifically, the general lowest-order correction field is given in an integral form. Some special examples, such as the lowest-order correction to the paraxial approx...

The conceptual design of the pulsed VUV synchrotron radiation (SR) source is reported. This machine has modi®ed racetrack shape (diamond shape) and consist of two superconducting bending magnets, two normal conducting bending magnets, iron yokes, quadrupole magnets and injection system. Maximum magnetic ̄ux density is 7 T. Injector is 100 MeV racetrack microtron and 100 MeV, 10 pps electron bea...

With a pulsed electron beam a gas mixture of Ar, Xe, and Rb was excited producing (XeRb) + ionic excimer molecules. To study the formation kinetics the (XeRb) + fluorescence pulse was measured as a function of the gas composition and the pumping density. From the observed fluorescence signal decay a value of 6k 1 X 10m3’ cm”/s for the formation rate constant of (XeRb) + from Xe+, Ar, and Rb was...

introduction magnetic fields are capable of altering the trajectory of electron beams andcan be used in radiation therapy.theaim of this study was to produce regions with dose enhancement and reduction in the medium. materials and methods the ndfeb permanent magnets were arranged on the electron applicator in several configurations. then, after the passage of the electron beams (9 and 15 mev va...

background: field matching problems in abutting electron fields can be managed by using spoilers. objective: the aim of this study was to design a monte carlo framework for the assessment of spoiler application in abutting electron fields. methods: a siemens primus treatment head was simulated for a 5 mev electron beam using beamnrc and dosxyznrc, egsnrc user codes. validation of beam model was...

A pulsed crossed beam technique is used to measure ionization cross-sections of metallic atoms. Relative values of cross-sections of single, double and triple ionization of magnesium have been successfully measured with good accuracy over the 0-700 eV range. Absolute values of cross-sections have been obtained by normalization to a theoretical value at high electron energy. Results are compared...

The design and operating characteristics of relativistic, electron beam magnetrons are described. The magnetrons are comprised of a pulsed field-emission cathode (-360kV, ~15kA, -30nsec) and several coupled resonators embedded in the anode block. The tubes are designed to work at fixed frequency, in range from 2.3 to 5GHz. The peak powers generated are typically 500 to 1000MW. *This work was su...

AlGaN/GaN metal-oxide-semiconductor high electron mobility transistors (MOS-HEMTs) using La2O3 as gate oxide by electron-beam evaporated have been investigated and compared with the regular HEMTs [1]. The La2O3 thin film achieved a good thermal stability after 200°C, 400°C and 600°C post-deposition annealing due to its high binding energy (835.7 eV) characteristics. Our measurements have shown ...

Abetract-Experiments involving the ejection of beams of electrons from spacecraft have been performed for more than 2 decades in order to study fundamental plasma physical processes as well as for a range of diagnosticand application-oriented purposes. This paper reviews some of the key issues that have been pursued in the past 10 years. These include questions regarding spacecraft charging and...