Magnetic equilibrium diagnostics in a finite β toroidal helical plasma in Heliotron E

This paper describes magnetic equilibrium diagnostics that are installed both inside and outside the vacuum vessel in the toroidal helical device Heliotron E. These magnetic diagnostics consist of Rogowski coils for plasma currents, a diamagnetic loop with compensation coils, a set of full flux loops, a set of partial saddle loops, modulated Rogowski coils with several harmonics, a 2D array of Bp coils and Rogowski coils for bus lines of helical, auxiliary vertical and toroidal coils. Up to now we have routinely obtained the diamagnetic stored energy, toroidal plasma currents, the dipole moment of the Pfirsch-Schlueter current, the toroidal voltage, the finite β free-boundary plasma shift and poloidal fluxes. We will describe the signals of measured magnetic fluxes and give some interpretations of the finite β equilibrium. (orig.)