Speaker
Tomas Markovic
(Institute of Plasma Physics of the CAS)
Description
A number of tokamaks, including the largest operating one, Joint European Torus (JET), has ferromagnetic core installed in their plasma current drive system. Moreover, some auxiliary systems, such as magnetic shielding of neutral beam injection (NBI) system, or iron inserts for toroidal field ripple mitigation, consist of non-negligible amount of ferromagnetic material as well. Besides the intended favorable effect of these materials on a specific magnetic field, there might be also unintended detrimental effects on the other magnetic fields. These need to be evaluated prior the installation of the ferromagnetic material and taken into account in the interpretation of the magnetic measurements and modelling.
This contribution presents a model used to simulate the effects of ferromagnetic material with general-geometry on distributions of magnetic field in the vicinity. It is based on integral method approach, which has the advantage in its computational simplicity. The model has been benchmarked on two tokamaks with ferromagnetic core (GOLEM and STOR-M) and then applied to characterize the effect of the core on the distribution of poloidal magnetic fields on these devices. Lastly, the effects of JET ferromagnetic core on the field induced by error field correction coils is evaluated by the presented model and discussed.
Co-authors
Akbar Rohollahi
(University of Saskatchewan, 116 Science Place, Saskatoon, SK S7N 5E2, Canada)
Akira Hirose
(University of Saskatchewan, 116 Science Place, Saskatoon, SK S7N 5E2, Canada)
Chijin Xiao
(University of Saskatchewan, 116 Science Place, Saskatoon, SK S7N 5E2, Canada)
Ivan Duran
(Institute of Plasma Physics of the CAS, Za Slovankou 1782/3, 182 00, Prague, Czech Republic)
Joseph Adegun
(University of Saskatchewan, 116 Science Place, Saskatoon, SK S7N 5E2, Canada)
Mikhail Gryaznevich
(Tokamak Energy Ltd, Culham Science Centre, Abingdon, United Kingdom;Technical University of Denmark, Anker Engelunds Vej 1 Bygning 101A, 2800 Kgs. Lyngby, Denmark)
Sergei Gerasimov
(CCFE, Culham Science Centre, OX14 3DB, Abingdon, United Kingdom)
Tomas Markovic
(Institute of Plasma Physics of the CAS, Za Slovankou 1782/3, 182 00, Prague, Czech Republic;Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 3, 121 16, Prague, Czech Republic)
Vojtech Svoboda
(Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University, Brehova 7, 115 19, Prague, Czech Republic)
