Electro-magnetic modeling of the planned active in-vessel coils at ASDEX Upgrade

• Published in: Fusion engineering and design 2009-06, Vol.84 (7), p.1653-1657
• Main Authors: Rott, M., Seidel, U., Streibl, B., Suttrop, W., Vierle, T.
• Format: Article
• Language: English
• Subjects: Applied sciences; ASDEX Upgrade; Controled nuclear fusion plants; Energy; Energy. Thermal use of fuels; Exact sciences and technology; Finite element modeling; In-vessel coils design; Installations for energy generation and conversion: thermal and electrical energy; MHD control; Tokamaks
• ISSN: 0920-3796; 1873-7196
• DOI: 10.1016/j.fusengdes.2008.11.104

A set of 16 in-vessel saddle coils is designed for mitigation of edge localised modes and feedback control of resistive wall modes in ASDEX Upgrade as part of a multi-stage enhancement for MHD control. The saddle coils are operated with direct and alternating currents. Substantial eddy currents are induced in the metal coil casing and an existing massive copper conductor near the coils mount position in the vacuum vessel. The shielding of the produced field, phase lag between coil current and produced field, active and apparent power, heating of the coil casing and re-cooling of the coil structure are modeled with 2D magnetodynamic and thermal finite element calculations. The results show that the design objectives ( f = 500 Hz, dc normal field B n = 6 mT, ac normal field B n = 1 mT, pulse length t pulse ≥ 6 s, cool-down time t pause ≤ 15 min) are met or, in most cases, exceeded.