Poloidal magnetic field measurements in a reversed field pinch plasma by a far-infrared polarimeter

A. Murari, E. Zilli, L. Giudicotti, L. De Pasqual, L. Zabeo, M. Bagatin, D. Desideri

Research output: Contribution to journalArticle


A multichannel far-infrared (FIR) polarimeter has been installed in RFX, a Reversed Field Pinch (RFP) plasma experiment, to measure the poloidal magnetic field profile. The polarimeter uses a CH3OH FIR laser operating at Λ=118.8 µm. Faraday rotation measurements on five of six parallel diagnostic chords are used in preliminary investigations of poloidal field profiles. The experimental results are generally found in good agreement with the µ&p model predictions. The choice of the profile of µ = µ0j·B/B2is discussed. For the reconstruction of the magnetic field profiles a numerical filamentary current equilibrium code is described, where polarimetric data are included as constraints. An alternative method based on the best-fit of a three-parameter µ profile to the polarimetric data is also reported. Both methods provide reliable reconstructions of the plasma magnetic field and the results indicate the existence in RFX of hollow µ profiles.
Original languageEnglish
Pages (from-to)1719 - 1731
Number of pages13
JournalInternational Journal of Infrared and Millimeter Waves
Issue number12
Publication statusPublished - 2004
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Condensed Matter Physics
  • Physics and Astronomy (miscellaneous)
  • Electrical and Electronic Engineering

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