A diagnostic procedure is proposed that displays the toroidal and poloidal magnetic field profiles in the form of power series, through r . In addition to the usual external measurements, only one internal point magnetic measurement is required, if cylindrical symmetry and pressure balance are assumed. (The plasma pressure profile is also assumed to be measured nonintrusively; alternatively, it might be ignored if beta is known to be sufficiently small.) The (zero-beta) method is tested here

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... inst full magnetic-profile shot-averaged data obtained from a multiple-probe device in ZT-40 with a ceramic liner. The agreement is quite good. The procedure seems simple enough for on-line use in RFP experiments. The availability of such profiles should enhance the effective application of theory to the RFP.