TY - JOUR
T1 - Effect of Faraday mirror imperfections in a fiber optic current sensor dedicated to ITER
AU - Karabulut, Dogus
AU - Miazin, Anton
AU - Goussarov, Andrei
AU - Moreau, Philippe
AU - Leysen, Willem
AU - Mégret, Patrice
AU - Wuilpart, Marc
N1 - Score=10
PY - 2019/1
Y1 - 2019/1
N2 - Plasma current measurements in ITER are safety-related and must therefore satisfy a very demanding specification. In this paper, the use of the Fiber Optics Current Sensor (FOCS) operating in the reflection mode with a Faraday mirror to perform plasma current measurements is analyzed. Based on the Jones matrix formalism, we performed numerical simulations to investigate the impact of the Faraday mirror detuning on the measurement accuracy. We show that the use of standard commercial components does not allow to satisfy the ITER requirements for the whole plasma current range. A simple solution to the problem is proposed, which consists in taking into account a mirror calibration in the current estimator. We show that the achievable mirror calibration accuracy is sufficient to fulfill the ITER requirements.
AB - Plasma current measurements in ITER are safety-related and must therefore satisfy a very demanding specification. In this paper, the use of the Fiber Optics Current Sensor (FOCS) operating in the reflection mode with a Faraday mirror to perform plasma current measurements is analyzed. Based on the Jones matrix formalism, we performed numerical simulations to investigate the impact of the Faraday mirror detuning on the measurement accuracy. We show that the use of standard commercial components does not allow to satisfy the ITER requirements for the whole plasma current range. A simple solution to the problem is proposed, which consists in taking into account a mirror calibration in the current estimator. We show that the achievable mirror calibration accuracy is sufficient to fulfill the ITER requirements.
KW - Fiber optics current sensors
KW - Polarimetric sensors
KW - Plasma diagnosis
UR - https://ecm.sckcen.be/OTCS/llisapi.dll/overview/37605241
U2 - 10.1016/j.fusengdes.2018.11.011
DO - 10.1016/j.fusengdes.2018.11.011
M3 - Article
SN - 0920-3796
SP - 48
EP - 52
JO - Fusion Engineering & Design
JF - Fusion Engineering & Design
ER -