• N Gopi

      Articles written in Pramana – Journal of Physics

    • Experimental study of the variation of the plasma temperature with the laser flux

      B K Sinha N Gopi S K Goel

      More Details Abstract Fulltext PDF

      Experiments performed with a 50 MW — 60 nsec ruby laser to estimate the temperature of the plasma produced on the planar targets of carbon as well as polyethylene are reported. Temperatures were estimated by two foil ratio technique. The temperatures of carbon and polyethylene plasma show aφ2/9 dependance on flux in the flux regime of 1010 W/cm2 to 5 × 1011 W/cm2. The comparatively slower dependance is explained on the basis of purely collisional absorption, the effect being enhanced due to relatively long duration of the laser pulses. Scaling laws of plasma temperature against laser flux obtained by different workers in different flux regimes have been analysed on the basis of collisional and non-collisional absorption.

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