Development of a magnetic diagnostic suitable for the ITER radiation environment

• Published in: 2009 1st International Conference on Advancements in Nuclear Instrumentation, Measurement Methods and their Applications pp. 1 - 8
• Main Authors: Moreau, Ph, Bolshakova, I, Brichard, B, Chitarin, G, Delogu, R, Duran, I, Encheva, A, Fournier, Y, Galo, A, Le-Luyer, A, Lister, J B, Malard, Ph, Moret, J M, Pastor, P, Peruzzo, S, Romero, J, Testa, D, Toussaint, M, Vayakis, G, Vila, R
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.06.2009
• Subjects: Force measurement; Force sensors; instrumentation; Magnetic sensors; Nuclear measurements; nuclear radiation effects; Optical fiber sensors; Optical fibers; Reliability engineering; Thermal force; Thermal sensors; Tokamaks
• ISBN: 9781424452071; 1424452074
• DOI: 10.1109/ANIMMA.2009.5503812

Magnetic diagnostics of the ITER tokamak must fulfill demanding specifications, because their accuracy and reliability affects margins to the machine engineering limits and there-fore operational flexibility. This paper describes the challenging issues related to the implementation of the magnetic diagnostics in a tokamak environment. We focus on nuclear radiations as they can significantly affect the measurement through Radiation Induced Electromotive Force (RIEMF) or Thermally Induced Electromotive Force (TIEMF). Thermal modeling of magnetic sensors and associated design studies are also reported as the thermal gradient in the sensors must be reduced to avoid TIEMF. Alter-native magnetic sensors such as fiber optic current sensors (FOCS) or steady state magnetic field sensors are also discussed because they serve as a backup to the usual inductive magnetic measurements. We conclude by a brief review of the development needs for magnetic diagnostics.