Reversed Spheromak

This paper summarizes several studies of fusion reactors based on the compact torus (CT). A wide variety of reactor configurations can be projected within present understanding of the possible types of CT and their macroscopic stability and confinement properties. Three types of CT are considered here, the field-reversed-configuration having B oroidal 0, the Spheromak with 0, and CT s formed with particle rings. 

The reversed field 0 pinch with no toroidal field inside the plasmoid is a more advantageous reactor-oriented device than the spheromak, in some respects, since the plasma formation is... 

A variety of configurations has been considered,including spheromaks, field-reversed simple mirrors, relativistic ring systems, and field reversed theta pinches. Of these, the latter may be considered a direct descendant of the long linear systems approach indeed, experiments on FR0P date back to the 1960 s. In this method, a quasi-steady bias field is first established in the plasma tube. 

Two types of CTs are studied at Los Alamos Spheromaks and Field Reversed Configurations (FRCs). Spheromaks, which contain both poloidal and toroidal field components, are produced by a magnetized coaxial source (magnetized Marshall gun), as shown in Fig. 1(a). The separated spheromak is trapped and confined in a metal flux conserver not shown in Fig. 1. Coaxial sources, 30 cm in diameter, have been used to form spheromaks in the CTX facility and its predecessor, the Prototype facility. ... 

In the same way we could fuel the field-reversed configuration. The transport scaling in the field-reversed configuration, is very different from that in other toroidal systems such as the reversed-field pinch , spheromak and tokamak. I say this because there is no shear in that system at all. Some instabilities are... 

I n the case of the spheromak, these studies are also at a relatively low level, but I think there is more background information coming from the reversed-field pinch, for example, on what one might expect for transport and what kind of microstability might exist there. 

A fairly complete first order reactor design has been done for the field-reversed configuration both for the TRACT and the moving-ring system CTOR, but it is very low level in comparison with the tokamak reactor designs. I am not so familiar with the spheromak reactor designs. I don t know whether anyone else can comment on them. This is all I have to say about those two configurations. It is perhaps time to open up for comments. 

Field-Reversed Theta-Pinch Compact Toroids Spheromak... 

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