title: Simulation of vibration-induced effect on plasma current measurement using a fiber optic current sensor.
abstract: An accurate measurement of the plasma current is of paramount importance for controlling the plasma magnetic equilibrium in tokamaks. Fiber optic current sensor (FOCS) technology is expected to be implemented to perform this task in ITER. However, during ITER operation, the vessel and the sensing fiber will be subject to vibrations and thus to time-dependent parasitic birefringence, which may significantly compromise the FOCS performance. In this paper we investigate the effects of vibrations on the plasma current measurement accuracy under ITER-relevant conditions. The simulation results show that in the case of a FOCS reflection scheme including a spun fiber and a Faraday mirror, the error induced by the vibrations is acceptable regarding the ITER current diagnostics requirements.
authors: Frédéric
authors: F
authors: Descamps
authors: Matthieu
authors: M
authors: Aerssens
authors: Andrei
authors: A
authors: Gusarov
authors: Patrice
authors: P
authors: Mégret
authors: Vincent
authors: V
authors: Massaut
authors: Marc
authors: M
authors: Wuilpart