The prospect for fuel ion ratio measurements in ITER by collective Thomson scattering

Morten Stejner Pedersen, Søren Bang Korsholm, Stefan Kragh Nielsen, Mirko Salewski, Henrik Bindslev, Vedran Furtula, Frank Leipold, Poul Michelsen, Fernando Meo, Dmitry Moseev

Research output: Contribution to journalJournal articleResearchpeer-review


We show that collective Thomson scattering (CTS) holds the potential to become a new diagnostic principle for measurements of the fuel ion ratio, nT/nD, in ITER. Fuel ion ratio measurements will be important for plasma control and machine protection in ITER. Measurements of ion cyclotron structures in CTS spectra have been suggested as the basis for a new fuel ion ratio diagnostic which would be well suited for reactor environments and capable of providing spatially resolved measurements in the plasma core. Such measurements were demonstrated in recent experiments in the TEXTOR tokamak. Here we conduct a sensitivity study to investigate the potential measurement accuracy of a CTS fuel ion ratio diagnostic on ITER. The study identifies regions of parameter space in which CTS can be expected to provide useful information on plasma composition, and we find that a CTS fuel ion ratio diagnostic could meet the ITER measurement requirements for a standard ELMy H-mode discharge.
Original languageEnglish
JournalNuclear Fusion
Issue number2
Pages (from-to)023011
Publication statusPublished - 2012


  • Plasma physics
  • Nuclear physics
  • Instrumentation and measurement


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