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This article presents a feasibility study for a motional Stark effect diagnostic on the TCV tokamak. A numerical simulation code has been used to identify the optimal port arrangement and geometrical layout. It predicts the expected measurement accuracy for a range of typical plasma scenarios. With the existing neutral particle injector and a detection system based on current day technology, it should be possible to determine the safety factor with an accuracy of the order of 5%. A vertically injected beam through the plasma center would allow to measure plasmas which are centered above the midplane, a common occurrence in connection with electron cyclotron resonance heating and electron cyclotron current drive experiments. In this case a new and ideally more powerful neutral beam injector would be required. (C) 2004 American Institute of Physics.
Ambrogio Fasoli, Basil Duval, Stefano Coda, Yves Martin, Holger Reimerdes, Alexander Karpushov, Damien Fasel, Umar Sheikh, Matthieu Toussaint, Pierre Lavanchy, Ugo Siravo, Rémy Jacquier, Marcelo Baquero Ruiz, Frédéric Dolizy, Jérémie Dubray, Claudia Colandrea, Dmytry Mykytchuk, Blaise Marlétaz, Matteo Vallar, Filippo Bagnato, Lorenzo Martinelli