Abstract
In the cylindrical coordinate, the origin {gamma} = 0 plays a role of the singularity and thus much care is needed to treat near-origin region. This work presents a new numerical scheme which is derived from the exact solution under the one-dimensional assumption in the radial direction. It is shown that the near-origin region can be properly treated by the radial-exponential scheme, whereas the numerical results from the conventional exponential scheme deviate considerably from the exact solution. Over the region of small ({delta}r) {sub e}/ {gamma}{sub e}, he present radial-exponential scheme turns out to be almost the same as the exponential scheme. (author). 3 refs., 3 figs., 1 tab.
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