[en] In the toroidal device ETA-BETA II designed for the production of high beta plasmas with RFP configuration, the possibility to vary the rise times of the toroidal field Bsub(z) and of the current Isub(z) in the range 2+100μs, is considered. For this purpose a transformer with variable turn ratio can be used for the theta circuit, while multi-turn inductors are considered for the z circuit. Different solutions for the theta transformer are discussed and the dimensions are optimized with respect to the cost. The resulting equivalent circuit is also reported

[en] The layout of the RFX's AC network, which is fed by the Italian 400 kV grid, is presented. The design of the step-down transformers, which are the most critical components, is briefly discussed. The criteria followed in the analysis of the interaction of the power system with the grid are discussed and the employed calculation tools, with their main results, are presented. 6 refs., 7 figs

[en] The layout of the buildings forming the site of the RFX experiment is described. The main features concerning the grounding system (both for the safety and for the operation of the machine) are discussed together with those of the screening system for the diagnostics and control areas. 6 figs

[en] Research on controlled nuclear fusion is pursued, at world level, along two basically independent approaches: magnetic confinement and inertial confinement. The former includes different magnetic configurations such as the Tokamak, the Stellarator, the Reversed Field Pinch (RFP), and the Mirror. The European strategy towards fusion is concentrated on toroidal magnetic confinement, focusing its effort mainly on the Tokamak which currently represents the most advanced line. In addition, research on Stellarator and RFP configurations is pursued because they possess intrinsic characteristics which may offer some advantages for a future demonstration reactor: the Stellartor can be current-free and provides a solution for steady state reactor operation; the RFP can achieve relatively high values of beta (∼10%) by using ohmic heating only, which holds the promise of a rather economic fusion reactor due to the high power density at which it could operate. This paper gives a short description of the RFP configuration, a comparison with the Tokamak, and a description of the RFX experiment

[en] The use of armoured transmission lines gives insignificant the electric and magnetic fields value over the territory

[en] Some modifications have been introduced in Eta-Beta II in order to achieve information about the expected behavior of the next generation of RFP machines. The inductor have been changed, thus increasing the rise time of the plasma current up to 0.5 ms; and active crowbar has been added, in order to extend the duration of the discharge. Moreover a detailed analysis of the inductor system has been carried out and a new equivalent network is proposed to simulate more accurately the machine behavior at the longer cooperating times

[en] An introductory description of the ''Eta--beta'' device, built in Padua for the production of toroidal axisymmetric plasmas, is given. The design of the main components is briefly discussed and the results of a number of design and operating tests performed are reported. Some problems of ''reliability'' and ''life'' are also considered

[en] After a short description of the power supply thyristor converters which are proposed to feed the toroidal and poloidal windings of the RFX experiment, the relationship between the AC and DC quantities has been evaluated, taking into account the free-wheeling diode performance and the commutation phenomena. The analytical solution for the current harmonic analysis has been developed for a single thyristor bridge and for different thyristor modules operating simultaneously. Finally, the influence of the converter system on the 380 kV supply network is analyzed

No abstract available

[en] The paper refers to Reverse-Field-Pinch configurations produced on the Padua ETA-BETA device by two different field programmings: the first, as usual, employs an axial field Bsub(z0) and two fast circuits for the Isub(z)-current and the reversed Bsub(z)-field; the second relies on the use of just the two fast circuits for Bsub(z) and Isub(z), the latter being delayed of about one quarter period with respect to the former. Both modes lead to R.F.P. configurations stable according to ideal MHD, characterized by axial currents up to 100 kA and rise times of about 1 μs. The experimental results obtained in a number of working conditions are discussed and compared. A preliminary account of the latest experiments is given. They include some results on the decay phase and the measurement of Tsub(e) by Thomson scattering. (author)