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The mechanism of ion extraction from flowing plasma using an external electrostatic field is investigated experimentally and computationally. The plasma is generated by electron impact ionization of a copper atomic beam. The plasma, along with the atomic beam vapor, flows upward and ions from the plasma are extracted using an external electrostatic field set up by a pair of parallel-plate electrodes...
Ripple in HV power supply is inevitable. In this current work, the effect of ripple present in the accelerating voltage on the dynamics of an electron beam from a strip-type electron gun is investigated. A comparative study has been performed by 3D simulation of the electron trajectories from the strip electron gun using SIMION 7 for AC and DC modes of filament-heating. In both the cases, it has been...
The method of Electron Beam-Physical Vapour Deposition (EB-PVD) for handling large substrates is well established in the metallurgical industry, where sweeping axisymmetric electron guns or multiple pencil guns are routinely used to cover a large target area. The non-uniformity in current density in those methods can be overcome, to a large extent, by using the strip-type electron gun. In this paper,...
We present results on the spatial distribution of copper vapour as a function of temperature, from a 2D evaporating source generated using 130mm strip electron beam at aspect ratio >3. At this aspect ratio vapour flow is expected to appear approximately as a point source flow. The 2D evaporating source during these studies can be described in terms of inverse Knudsen number (1/K n ) that...
Strip electron guns, capable of generating two-dimensional (length⪢width) evaporating sources, are used for the application of electron beam assisted physical vapour deposition to metallurgical coating of large substrates. The collisional relaxation processes in the atomic vapour generated using such a 2D-source differ significantly from those in a point source created using axisymmetric electron...
We present results on the spatial distribution of copper vapour flux in the three-dimensional flow behaviour region under identical experimental conditions as a function of the temperature of a two-dimensional (2D) evaporating source. These experimental results clearly show that, with increasing source temperature, atomic collision processes along the length and the width of a 2D source differ, which...
During electron beam processing, a fraction of the incident power gets backscattered from the target surface, which can be as high as 40% of the incident beam power depending on the beam energy and atomic number of the target material. In the case of a strip electron gun, a uniform magnetic field is used for focusing and deflection of electron beam through 270 o . With the strip beam (78mmx5mm,...
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