Premium
Currents in Intersected Tokamak Flux Tubes
Author(s) -
Hantzsche E.
Publication year - 1988
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.2150280423
Subject(s) - limiter , tokamak , saturation current , plasma , toroid , materials science , atomic physics , plasma parameters , electron , electron temperature , flux tube , electric current , current (fluid) , langmuir probe , electron density , current density , saturation (graph theory) , mechanics , voltage , physics , plasma diagnostics , magnetic flux , magnetic field , thermodynamics , nuclear physics , electrical engineering , mathematics , quantum mechanics , combinatorics , engineering
In an elementary way the toroidal electric current in tokamaks is considered if the flux tube is intersected by limiters within the Scrape Off Layer (SOL). Simple sheath conditions are applied. The limiter space charge sheaths act as additional resistances, consuming partly the available voltage and diminishing the current density which is limited both by the plasma conductivity and by the ion saturation current of the sheaths. The difference between both potential drops at a limiter may rise up to the loop voltage (per flux tube circulation). Electron induced secondary electron emission has no influence at all on these results, which are applied to measured SOL plasma parameters in the TEXTOR tokamak as an example.