Active toroidal field ripple compensation and MHD feedback control coils in FAST

G. Ramogida, G. Calabrò, V. Cocilovo, F. Crescenzi, F. Crisanti, A. Cucchiaro, G. Di Gironimo, R. Fresa, V. Fusco, P. Martin, S. Mastrostefano, R. Mozzillo, F. Nuzzolese, F. Renno, C. Rita, F. Villone, G. Vlad

Research output: Contribution to journalArticle

10 Citations (Scopus)


The Fusion Advanced Study Torus (FAST) has been proposed as a high magnetic field, compact size tokamak providing a flexible integrated environment to study physics and technology issues in ITER and DEMO relevant conditions. FAST has a quite large natural toroidal field ripple (around 1.5%) due to its compactness and to the number of access ports: this ripple must be lowered to an acceptable level to allow safe operations and a good confinement quality. An Active Ripple Compensating System (ARCS) has been designed, based on a set of poloidal coils placed between the plasma chamber and the Toroidal Field Coils (TFCs). These ARCS coils will be fed with adjustable currents, opposite in direction respect to the TFC currents, and will allow lowering the ripple up to zero and beyond. The CAD model of FAST including the ARCS coils has been completed and preliminary electromagnetic and thermal analyses have been carried out. Moreover, a Feedback Active Control System (FACS) composed of two arrays of in-vessel saddle coils has been designed to allow safe high plasma current, low safety factor operation and to mitigate possibly large ELMs effects in FAST. These FACS coils will be fed by a feedback system to control MHD modes: a first engineering assessment of the current requirements has been carried out. © 2013 Euratom-ENEA Association sulla Fusione.
Original languageEnglish
Pages (from-to)1156 - 1160
Number of pages5
JournalFusion Engineering and Design
Issue number6-8
Publication statusPublished - 2013
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Mechanical Engineering

Cite this

Ramogida, G., Calabrò, G., Cocilovo, V., Crescenzi, F., Crisanti, F., Cucchiaro, A., ... Vlad, G. (2013). Active toroidal field ripple compensation and MHD feedback control coils in FAST. Fusion Engineering and Design, 88(6-8), 1156 - 1160.