Research in select areas of theoretical Physics and applied Mathematics. Present focus includes modelling advanced electron sources having high brightness and low emittance, space-charge affected electron beams and development of indigenous particle-in-cell code PASUPAT for front-line research.
It was analytically shown that space charge limited current for a curved emitter is enhanced by a factor of field enhancement factor at the apex of the curved emitter. This result was verified with PIC simulation using indigenous code PASUPAT.
A hybrid model for determining the field emission current from a large area field emitter, consisting of ordered or randomly placed nano-tipped metallic structures has been proposed. The approach uses numerical modeling of a single emitter combined with recent analytical advances made at AMTPS to incorporate shielding and anode-proximity effects. The hybrid model has been tested for consistency against recent published experimental results on gold nano-cones. It is the only method to be able to deal with tens of thousands of nano-emitters since the problem is beyond the scope of purely numerical methods.
The utility of the Schottky conjecture on the multiplicative electric field enhancement of compounded micro-protrusions was enhanced by providing correction terms and enunciating a Corrected Schottky Conjecture.
Particle-in-cell is very useful technique for studying interaction of charged particles with self generated or imposed electromagnetic field. PASUPAT is an indigenous PIC code developed at AM&TPS in collaboration with Computer Division BARC.
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PASUPAT is Three dimensional Fully relativistic PIC code for self-consistent modelling of electromagnetics problesm.
The code is available on ANUPAM Supercomputing facility of Computer Division, BARC as well as Megh Cloud computing System at BARC.
Interest users inside BARC may also download a PASUPAT virtual machine to work on their own desktop.
A hybrid method to model computationally resource intensive problem of field emission from gated compound structures has been developed at AM&TPS.
A three dimensional fully relativistic electromagnetic PIC code to carry out simulation in Electromagnetics and Charged Particle Dynamics. Interested users may see following link