Analysis of magnetic surface functions using experimentally measured data

Summary form only given. A reversed field pinch (RFP) has a property that plasma itself makes magnetic fields which are necessary to confine plasma The self organization phenomenon is explained by Taylor´s relaxation theory. From the artificial or theoretical considerations of relaxation processes, forms of the magnetic surface function I=rB/sub t/ and P, where B/sub t/ is a toroidal magnetic field and P is a kinetic pressure, are derived and used for equilibrium stability and transport analyses. For axi-symmetric plasma which can be a Tokamak or RFP, we are developing a code to interpolate these surface functions from experimentally measured data. The merits of this code are as follows: we identify a more realistic surface function and compare those with theoretical ones; we can analyze realistic equilibrium configurations; and we can obtain the time history of the helicity which is a crucial parameter of the relaxation theory. As for measured data, we use poloidal flux at some points of vacuum vessel surface, toroidal flux, F-value, /spl theta/-value and /spl beta/-value at a plasma center. As the results, we could develop the code which derives surface functions I, P from those data, and effects of measurement error on those functions are examined.