skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

Abstract

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
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 85; Journal Issue: 11; Other Information: (c) 2014 Euratom; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
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

Citation Formats

Mlynek, A., E-mail: amlynek@ipp.mpg.de, Casali, L., Eixenberger, H., and Ford, O. Fringe jump analysis and implementation of polarimetry on the ASDEX Upgrade DCN interferometer. United States: N. p., 2014. Web. doi:10.1063/1.4890574.
Mlynek, A., E-mail: amlynek@ipp.mpg.de, Casali, L., Eixenberger, H., & Ford, O. Fringe jump analysis and implementation of polarimetry on the ASDEX Upgrade DCN interferometer. United States. https://doi.org/10.1063/1.4890574
Mlynek, A., E-mail: amlynek@ipp.mpg.de, Casali, L., Eixenberger, H., and Ford, O. 2014. "Fringe jump analysis and implementation of polarimetry on the ASDEX Upgrade DCN interferometer". United States. https://doi.org/10.1063/1.4890574.
@article{osti_22303829,
title = {Fringe jump analysis and implementation of polarimetry on the ASDEX Upgrade DCN interferometer},
author = {Mlynek, A., E-mail: amlynek@ipp.mpg.de and Casali, L. and Eixenberger, H. and Ford, O.},
abstractNote = {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.},
doi = {10.1063/1.4890574},
url = {https://www.osti.gov/biblio/22303829}, journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 11,
volume = 85,
place = {United States},
year = {Sat Nov 15 00:00:00 EST 2014},
month = {Sat Nov 15 00:00:00 EST 2014}
}