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24 kW EB Welding Machine
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Developmental work related to the 24 kW EB Welding Machine is nearing completion. The electron gun column has been tested on a work chamber maintained at 10-5 mbar. After having obtained 10-5 mbar vacuum in the gun column, beam trials have been taken on a copper block. A stable beam of 7.5 kW has been obtained. Bead-on-plate trials on SS plate has been taken with the beam. A penetration of 13 mm has been obtained on AISI304SS with a 140 mA beam at 50 kV DC.
A high frequency (400 Hz), inverter-based, 90 kV, 350 mA DC power source for use with this EB Welding gun has been fabricated. Commissioning trials are going on.
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Transverse Evaporation System
| The unit consists of a non-Pierce type 10kW, 10 kV gun generating a 270o bent electron beam using crossed electrostatic and magnetic fields. The gun is immersed in a magnetic field generated by a permanent magnet with suitable pole pieces. Beam oscillation is carried out by electromagnets. Satisfactory operation on test copper block at different power levels has been carried out. The unit is being used for development of coatings. The photo shows the unit in operation |
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300 kW EB Evaporation System
| The objective of this project is to develop a 300 kW EB gun operating at 60 kV DC, with a bombarded cathode that can produce a strip beam (200 mm long and 5 mm wide). Such systems are suitable for continuous evaporation of metals. The work chamber for this unit is 1000 mm diameter and it is 600 mm in length. This work chamber with the magnetic deflection coils and the required vacuum system has been designed and fabricated. |
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Beam Dynamics
A 3D relativisitc beam dynamics code, Poison Ivy, has been developed to simulate the behaviour of charged particles moving under complicated electrode geometries. The code has the facility to rotate and view the electrodes from any direction, and to slice and display any internal section of the system. Multitple equipotential surfaces can be displayed and particle trajectories can be initialized from a regular surface or from arbitrary locations. External electric and magnetic fields can be imposed.
The figure shows a strip type electron gun simulated using this code. |
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Vacuum Arc metal ion implanter
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A Vacuum-arc Metal-ion Implanter is under development. This implanter employs an ion source (shown at left) of high current capability up to 100 mA and ion energies in multiples of 60 keV upto a maximum of 300 keV depending on the ion charge. The beam parameters could be tuned to the job requirement and the processing carried out in a hydrocarbon free environment.
The schematic shows a preliminary design of the unit.
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