Design of the motional Stark effect diagnostic in FTU

R. De Angelis, A. Sarkissian, S.E. Segre, N. Tartoni, V. Zanza

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This article reports on the design of the motional Stark effect diagnostic (MSE) for the Frascati Tokamak Upgrade tokamak (Rmaj=93 cm, rmin=33 cm, BT<8 T). The attenuation and emissivity of a diagnostic hydrogen beam have been estimated for typical discharges to assess the feasibility of the diagnostic. Due to the geometrical constraints the beam direction and the polarimeter lines of sight lie on a vertical plane on the same horizontal port. This layout has the advantage of a more convenient projection of the polarization vector on the line of sight, which increases the sensitivity of the measure. The relay optics has been designed so as to minimize Faraday rotation effects which would perturb the measurements. Two polarimeters based on different modulating techniques are compared and discussed. The first one makes use of photoelastic modulators. The second employs a fast rotating retarder plate. © 2001 American Institute of Physics.
Original languageEnglish
Pages (from-to)1015 - 1017
Number of pages3
JournalReview of Scientific Instruments
Issue number1 II
Publication statusPublished - Jan 2001
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Instrumentation

Cite this

De Angelis, R., Sarkissian, A., Segre, S. E., Tartoni, N., & Zanza, V. (2001). Design of the motional Stark effect diagnostic in FTU. Review of Scientific Instruments, 72(1 II), 1015 - 1017.