Abstract
In order to supply plasma fuel confined inspheromak-like compact toroids (SCTs) to a fusion device,the SCTs must be successfully guided through a drift tube region,in which they might be influenced by the magnetic field leakingfrom the fusion device. To reveal the SCT dynamics in a drift tube,MHD numerical simulations, where the SCTs are acceleratedin a co-axial perfectly conducting cylinderwith an external magnetic field, are carried out. In addition,the effect of an extended central electrodeis examined by changing the length of the inner conducting cylinder.It is revealed that the SCT penetration depth is shorterthan that estimated from the conventional conducting sphere modeland that the SCTs are further decelerated by extending the inner conducting cylinder.These results are consistent with the resultsof the compact toroid injection experiment performed on the TEXT Upgrade tokamak.Finally, the deceleration mechanism of the SCTs is discussedby comparing the simulation result with the proposed theoretical model.
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