The Formation of a Tokamak-like Plasma in Initial Experiments Using an Outboard Plasma Gun Current Source

Autor:	Aaron Sontag, R.J. Fonck, Aaron J. Redd, D. J. Battaglia, Michael W. Bongard
Rok vydání:	2008
Předmět:	Physics Nuclear and High Energy Physics Tokamak Dense plasma focus Field strength Plasma Fusion power law.invention Nuclear physics Nuclear Energy and Engineering Physics::Plasma Physics law Pegasus Toroidal Experiment Atomic physics Current (fluid) Current density
Zdroj:	Journal of Fusion Energy. 28:140-143
ISSN:	1572-9591 0164-0313
DOI:	10.1007/s10894-008-9165-y
Popis:	Solenoid-free tokamak startup via point-source DC helicity injection is demonstrated on the Pegasus Toroidal Experiment using a high current density, low impurity plasma gun mounted near the outboard midplane. A threshold in the vacuum vertical magnetic field strength that allows the injected current filament to relax into a tokamak-like topology is observed. A simple 2-D model of the vacuum magnetic field suggests this threshold is the maximum field strength that allows a toroidally connected field null to form. Discharges with I p ≈ 17 kA are produced using less than 2 kA of injected current and no inductive drive. The tokamak-like discharges exhibit current decay times about five times longer than the injected current decay, expansion of the plasma into the vacuum region and a significant increase in the line-integrated density.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5449d9227ef1c78004b4b7d6b710f0d3 https://doi.org/10.1007/s10894-008-9165-y Zobrazit plný text záznamu Full text from SpringerLink