The JET Magnet Power Supplies and Plasma Control Systems

Microwave Dielectric Properties of Perovskite-Like Structured Ba8Ta6(Ni1-xMx)O24 (M=Co, Cu, and Zn) Solid Solutions

“…The relation between the growth rate of the vertical instability and the plasma parameters has been described in Ref. [6]. In general terms, the destabilizing force on the plasma, displaced by 6Z P from the original position, can be (4) Here, r m is the average effective distance of the magnetic circuit from the plasma centre, F p is the average plasma minor radius, a is the minor horizontal plasma radius, b is the minor vertical plasma radius, and the coefficients P q and P T take into account plasma current effects and are equal to 1 for a flat current profile.…”

Surface Morphology of Tl2Ba2Ca2Cu3Oy Thin Films Prepared by Thallium Diffusion Process

“…This is the reason why the problems of determining the position and shape of the plasma from externally measured magnetic signals are successfully solved both for tokamaks [58][59][60][61][62] and for stellarators [37,38,63]. Very good accuracy is achieved in practice, and knowledge of p(r) and j(r) is not required for this.…”

Adaptive plasma current control in RFX-mod

“…The block called Plant represents all the RFXmod machine components relevant for the plasma current control, including power supplies (PCAT), plasma, magnetic sensors, DAC and ADC converters, signal conditioning. The control signal c(t), that is the PCAT voltage reference, results from the addition of three components: an optional pre-programmed reference h(t) (included to improve the controller flexibility); the output of the adaptive feed-forward F(z); the output of the discretised version C(z) of the feed-back regulator (1). The structure of these two components will be described in the next sections.…”

“…Control systems were successfully implemented even on the basis of relatively simple models of the plasma response, neglecting the plasma resistance [1][2][3].…”