Spheromak parameters

Table 9. Representative Parameters for a Large Spheromak Ignition Reactor With Resistively Decaying...

Representative parameters of a small Spheromak TCT reactor are given in Table 10. Here it is argued by the authors of Ref. 22 that, for a single ion component, the Q for resistivity losses,... 

Table 10. Representative Parameters for a Small Spheromak TCT Reactor With Beam-Driven Currents22...

We discuss (1) the theoretical analysis of the spheromak, (recent theoretical studies are summarized and a comparison is made with other approaches), and (2) a spheromak plasma formation scheme. One of the difficult aspects of spheromak research is to produce a toroidal plasma in the absence of coils down the axis of rotational symmetry. A novel plasma formation scheme has been developed at PPPL to create a toroidal plasma by using a flux generating core technique. This formation scheme has been optimized with the assistance of resistive MHD computer codes. The parameters of the S-1 device, now under construction, were determined with various theoretical aids. 

The observed tilting is consistent with theoretical predictions which further, predict stability for a sufficiently oblate Spheromak in a flux conserving shell Experiments with oblate flux conservers as shown in Fig. 10, have confirmed the theoretical prediction. Isloated, oblate Spheromak rings are produced which decay stably and have parameters given in Table 2. 

The parameters of Proto S-1 and the S-l device under construction (see Fig. 12) are shown in Table 2. The objective of this approach is to inductively form a Spheromak on a timescale intermediate to a resistive diffusion time and a sound transit time. A vacuum poloidal field is established by toroidal currents in a supported ring (see Fig. 13). A toroidal solenoid inside the ring is switched off to provide a poloidal EMF while the toroidal ring current is driven down forcing reconnection. The resulting plasma currents form an isolated Spheromak as shown in Fig. 13. The process is an inductive version of the direct-coupled process employed with guns. 

Experiments in Proto S-1 have produced Spheromak rings with parameters given in Table 2. Some evidence for nonsymmetric instability has been obtained ... 

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