Far-infrared polarimetry diagnostic for measurement of internal magnetic field dynamics and fluctuations in the C-MOD Tokamak (invited)

Far-infrared polarimetry diagnostic for measurement of internal magnetic field dynamics and fluctuations in the C-MOD Tokamak (invited)

A laser-based (2.55 THz) mulitchord polarimeter is now operational on Alcator C-Mod and is used to make measurements of the internal magnetic field structure as well as plasma fluctuations. The polarimeter is designed to measure the Faraday effect for high-field (up to 8.3 T) and high-density (up to...

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Veröffentlicht in:Review of scientific instruments 2012-10, Vol.83 (10), p.10E316-10E316
Hauptverfasser: Bergerson, W F, Xu, P, Irby, J H, Brower, D L, Ding, W X, Marmar, E S
Format: Artikel
Sprache:eng
Schlagworte:
Diagnostic systems
Dynamics
Fluctuation
Lasers
Magnetic fields
Polarimeters
Temporal logic
Tokamak devices
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Beschreibung
Zusammenfassung:A laser-based (2.55 THz) mulitchord polarimeter is now operational on Alcator C-Mod and is used to make measurements of the internal magnetic field structure as well as plasma fluctuations. The polarimeter is designed to measure the Faraday effect for high-field (up to 8.3 T) and high-density (up to 5 × 10(20) m(-3)) ITER relevant plasma conditions. Initial 3 chord tests are consistent with magnetic equilibrium reconstructions and indicate no measurable contamination from the toroidal magnetic field due to the Cotton-Mouton effect or misalignment. Time response of
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4731757