• Ashim P Jain

      Articles written in Pramana – Journal of Physics

    • Surface plasma waves over bismuth-vacuum interface

      Ashim P Jain J Parashar

      More Details Abstract Fulltext PDF

      A surface plasma wave (SPW) over bismuth-vacuum interface has a signature of mass anisotropy of free electrons. For SPW propagation along the trigonal axis there is no birefringence. The frequency cutoff of SPW$$\omega _{cutoff} = \omega _p /\sqrt {2(\varepsilon _L + \varepsilon )} $$ lies in the far infrared region and can be accessed using free electron laser. The damping rate of waves at low temperatures is low. The surface plasma wave may be excited by an electron beam of current ∼100 mA propagating parallel to the interface in its close proximity.

    • Excitation of surface plasma waves over corrugated slow-wave structure

      Ashim P Jain Jetendra Parashar

      More Details Abstract Fulltext PDF

      A microwave propagating along vacuum—dielectric—plasma interface excites surface plasma wave (SPW). A periodic slow-wave structure placed over dielectric slows down the SPW. The phase velocity of slow SPW is sensitive to height, periodicity, number of periods, thickness and the separation between dielectric and slow-wave structure. These slow SPW can couple the microwave energy to the plasma and can sustain the discharge. The efficiency of the power coupling is few per cent and is sensitive to separation between dielectric and slow-wave structure.

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