title: Tokamak startup using point-source dc helicity injection.
abstract: Startup of a 0.1 MA tokamak plasma is demonstrated on the ultralow aspect ratio Pegasus Toroidal Experiment using three localized, high-current density sources mounted near the outboard midplane. The injected open field current relaxes via helicity-conserving magnetic turbulence into a tokamaklike magnetic topology where the maximum sustained plasma current is determined by helicity balance and the requirements for magnetic relaxation.
authors: Department of Engineering Physics, University of Wisconsin, 1500 Engineering Drive, Madison, Wisconsin 53706, USA.
authors: D J
authors: DJ
authors: Battaglia
authors: M W
authors: MW
authors: Bongard
authors: R J
authors: RJ
authors: Fonck
authors: A J
authors: AJ
authors: Redd
authors: A C
authors: AC
authors: Sontag