Nonlinear MHD simulations show that Mercier-unstable Wendelstein configurations generate a tokamak-like dynamo early, but partial reconnection and multi-mode competition prevent sustained flux pumping, so current drive and marginal stability may be needed.
Physics of Plasmas 7 (6), 2439--2448
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A comparison of low-n Mercier unstable Wendelstein stellarators and quasi-interchange modes in tokamaks
Nonlinear MHD simulations show that Mercier-unstable Wendelstein configurations generate a tokamak-like dynamo early, but partial reconnection and multi-mode competition prevent sustained flux pumping, so current drive and marginal stability may be needed.