• P Dasgupta

      Articles written in Pramana – Journal of Physics

    • Dual pole eikonal ands-channel singularities

      S Biswas P Dasgupta

      More Details Abstract Fulltext PDF

      Eikonalization of dual pole amplitudes, such as the Veneziano amplitude, is shown to lead to singularities in the impact parameter plane, which, in the eikonal approximation, may be interpreted as branch points in the direct channel angular momentum plane. This result is discussed in the light of dual absorption models.

    • Transport in boundary layer of divertor tokamaks

      S B Halder P Dasgupta

      More Details Abstract Fulltext PDF

      Study of transport in the boundary layer of tokamak plasma in presence of magnetic divertors is extended to the second order in ion collision frequency. Numerical results for ion and energy losses to the collector plates are presented for toroidal and poloidal divertors. For the toroidal case, the Wiener-Hopf solution for the second order distribution function is obtained. An error occurring in an earlier first order calculation is pointed out and corrected first order fluxes are also given. For the poloidal divertor, asymmetry observed in ion and energy transport is found to persist in the second order result.

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