Affordable Access

Assessment of the ITER High-Frequency Magnetic Diagnostic Set

Authors
  • Testa, D.
  • Carfantan, H.
  • Toussaint, M.
  • Chavan, R.
  • Fournier, Y.
  • Guterl, J.
  • Lister, J. B.
  • Maeder, T.
  • Moret, J.-M.
  • Perez, A.
  • Sanchez, F.
  • Schaller, B.
  • Slater, C.
  • Stoeck, M.
  • Tonetti, G.
Publication Date
Jan 01, 2011
Source
Infoscience @ EPFL
Keywords
License
Unknown
External links

Abstract

The ITER high-frequency (HF) magnetic diagnostic system has to provide essential measurements of MHD instabilities with |deltaBmeas/BPOL|~1e-4 (~1G) for frequencies up to 2MHz to resolve toroidal mode numbers (n) in the range |n|=10 to |n|=50. A review of the measurement requirements for HF MHD instabilities in ITER was initiated during the TW4 work-program and led to significant interest for physics and real-time control issues in measuring modes with |deltaBMEAS| as low as ~10mG at the position of the sensors, with |n|<=30 and poloidal mode numbers |m|~2|n| up to |n|~15, for a frequency range extending up to ~500kHz. We have examined the ability of the current ITER design for the individual sensors and the diagnostic system as a whole to meet these needs, and have explored what adjustments to the design (of the individual sensors and/or of the system as a whole) or to the requirements would be needed to meet them when considering different hypothesis for the financial costs and risk management over the ITER life-time. First, we find that the proposed diagnostic layout, with 168 sensors in total, does not meet the more stringent measurement requirements and risk management criteria: these can only be met by a revision of the design requiring 350 to 500 sensors, depending on different costing and risk management options. Second, we find that the current design for the ITER HF Mirnov-type pick-up coil could be usefully revised.

Report this publication

Statistics

Seen <100 times