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作者:M.W. Bongard , G.M. Bodner ...
来源:[J].Nuclear Fusion(IF 2.734), 2019, Vol.59 (7)
摘要:Experiments on the P egasus ST are advancing the physics and technology basis of local helicity injection (LHI). LHI injects helicity with relatively intense electron current sources in the plasma edge. It creates high toroidal current, toroidally-averaged tokamak-like plas...
作者:M.W. Bongard , M.G. Burke ...
来源:[J].Nuclear Fusion(IF 2.734), 2018, Vol.58 (7)
摘要:A 0D circuit model for predicting in Local Helicity Injection (LHI) discharges is developed. Analytic formulas for estimating the surface flux of finite- plasmas developed by Hirshman and Neilson (1986 Phys. Fluids 29 790) are modified and expanded to treat highly shaped, ul...
作者:M.W. Bongard , M.G. Burke ...
来源:[J].Nuclear Fusion(IF 2.734), 2018, Vol.58 (9)
摘要:Local helicity injection (LHI) is a non-solenoidal current drive capable of achieving high- tokamak startup with non-invasive current injectors in the plasma scrape-off layer. The choice of injector location within the edge region is flexible but has a profound influence on ...
作者:M.W. Bongard , R.J. Fonck ...
来源:[J].Nuclear Fusion(IF 2.734), 2017, Vol.57 (7)
摘要:Plasmas in the Pegasus spherical tokamak are initiated and grown by the non-solenoidal local helicity injection (LHI) current drive technique. The LHI system consists of three adjacent electron current sources that inject multiple helical current filaments that can reconnect...
作者:M.W. Bongard , J.L. Barr ...
来源:[J].Nuclear Fusion(IF 2.734), 2017, Vol.57 (2)
摘要:H-mode is obtained at in the Pegasus Toroidal Experiment via Ohmic heating, high-field-side fueling, and low edge recycling in both limited and diverted magnetic topologies. These H-mode plasmas show the formation of edge current and pressure pedestals and a doubling of the...
作者:M.W. Bongard , K.E. Thome ...
来源:[J].Nuclear Fusion(IF 2.734), 2014, Vol.54 (11)
摘要:Peeling modes are observed at the plasma edge in the Pegasus Toroidal Experiment under conditions of high edge current density ( J edge ∼ 0.1 MA m−2) and low magnetic field ( B ∼ 0.1 T) present at near-unity aspect ratio. Their macroscopic properti...
作者:M.W. Bongard , R.J. Fonck
来源:[J].Nuclear Fusion(IF 2.734), 2011, Vol.51 (7), pp.073029 (10pp)
摘要:Localized current injection near the outboard midplane is used to form 0.1 MA plasma discharges with no induction supplied from a central solenoid in the ultra-low aspect ratio Pegasus Toroidal Experiment. The discharges are initiated by driving open-field-line currents that pert...

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