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Title: Fringe jump analysis and implementation of polarimetry on the ASDEX Upgrade DCN interferometer

The ASDEX Upgrade tokamak is equipped with a 5-channel DCN interferometer with a probing wavelength of 195 μm. Up to now, phase measurement and density calculation have been accomplished by hard-wired phase counting electronics. Meanwhile, a fast digitizer has been installed which acquires the raw signals. That way, the various causes of counting errors by integer multiples of 2π, so-called fringe jumps, can be analyzed, and phase reconstruction schemes based on digital signal processing can be developed. In addition, a prototype polarimeter setup has been installed on one channel and allows for measurement of the Faraday rotation experienced by the probing beam.
Authors:
; ;  [1] ;  [2]
  1. Max-Planck-Institute for Plasma Physics, Garching 85748 (Germany)
  2. Max-Planck-Institute for Plasma Physics, Greifswald 17491 (Germany)
Publication Date:
OSTI Identifier:
22303829
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 11; Other Information: (c) 2014 Euratom; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ASDEX TOKAMAK; BEAMS; ERRORS; FARADAY EFFECT; INTERFEROMETERS; POLARIMETERS; POLARIMETRY; PROBES; WAVELENGTHS; WIRES