Axial propagation characteristics of the axisymmetric surface wave along the plasma in the medium tube were studied.The expressions of electromagnetic field inside and outside the medium tube were deduced.Also,the impacts of several factors,such as plasma density,signal frequency,inner radius of medium tube,collision frequency,etc.,on plasma surface wave propa- gation were numerically simulated.The results show that,the properties of plasma with higher density and lower gas pressure are closer to those of metal conductor.Furthermore,larger radius of medium tube and lower signal frequency are better for surface wave propagation.However,the effect of collision frequency is not obvious.The optimized experimental parameters can be chosen a,s the plasma density of about 1017m-3and the medium radius between 11 mm and 19 ram.
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