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Tests of a full-scale ITER toroidal interferometer and polarimeter (TIP) prototype on the DIII-D tokamak (invited).
Van Zeeland, M A; Carlstrom, T N; Finkenthal, D K; Akiyama, T; Boivin, R L; Colio, A; Du, D; Gattuso, A; Glass, F; Muscatello, C M; O'Neill, R; Smiley, M; Vasquez, J; Watkins, M; Brower, D L; Chen, J; Ding, W X; Johnson, D; Mauzey, P; Perry, M; Watts, C; Wood, R.
Affiliation
  • Van Zeeland MA; General Atomics, P.O. Box 85608 San Diego, California 92186-5608, USA.
  • Carlstrom TN; General Atomics, P.O. Box 85608 San Diego, California 92186-5608, USA.
  • Finkenthal DK; Palomar Scientific Instruments, San Marcos, California 92069, USA.
  • Akiyama T; National Institute for Fusion Science, Gifu 509-5292, Japan.
  • Boivin RL; General Atomics, P.O. Box 85608 San Diego, California 92186-5608, USA.
  • Colio A; Palomar Scientific Instruments, San Marcos, California 92069, USA.
  • Du D; General Atomics, P.O. Box 85608 San Diego, California 92186-5608, USA.
  • Gattuso A; General Atomics, P.O. Box 85608 San Diego, California 92186-5608, USA.
  • Glass F; General Atomics, P.O. Box 85608 San Diego, California 92186-5608, USA.
  • Muscatello CM; General Atomics, P.O. Box 85608 San Diego, California 92186-5608, USA.
  • O'Neill R; General Atomics, P.O. Box 85608 San Diego, California 92186-5608, USA.
  • Smiley M; General Atomics, P.O. Box 85608 San Diego, California 92186-5608, USA.
  • Vasquez J; General Atomics, P.O. Box 85608 San Diego, California 92186-5608, USA.
  • Watkins M; General Atomics, P.O. Box 85608 San Diego, California 92186-5608, USA.
  • Brower DL; Department of Physics and Astronamy, University of California Los Angeles, Los Angeles, California 90095, USA.
  • Chen J; Department of Physics and Astronamy, University of California Los Angeles, Los Angeles, California 90095, USA.
  • Ding WX; Department of Physics and Astronamy, University of California Los Angeles, Los Angeles, California 90095, USA.
  • Johnson D; Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543-0451, USA.
  • Mauzey P; General Atomics, P.O. Box 85608 San Diego, California 92186-5608, USA.
  • Perry M; California State University, San Marcos, California 92096, USA.
  • Watts C; ITER Organization, 13067 Saint Paul Lez Durance Cedex, France.
  • Wood R; Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543-0451, USA.
Rev Sci Instrum ; 89(10): 10B102, 2018 Oct.
Article in En | MEDLINE | ID: mdl-30399936
ABSTRACT
A full-scale ITER toroidal interferometer and polarimeter (TIP) prototype, including an active feedback alignment system, has been installed and tested on the DIII-D tokamak. In the TIP prototype, a two-color interferometry measurement of line-integrated density is carried out at 10.59 µm and 5.22 µm using a CO2 and quantum cascade laser, respectively, while a separate polarimetry measurement of the plasma-induced Faraday effect is made at 10.59 µm. The TIP prototype is equipped with a piezo tip/tilt stage active feedback alignment system that minimizes noise in the measurement and keeps the diagnostic aligned throughout DIII-D discharges. The measured phase resolution for the polarimeter and interferometer is 0.05° (100 Hz bandwidth) and 1.9° (1 kHz bandwidth), respectively. The corresponding line-integrated density resolution for the vibration-compensated interferometer is δnL = 1.5 × 1018 m-2, and the magnetic field-weighted line-integrated density from the polarimeter is δnBL = 1.5 × 1019 Tm-2. Both interferometer and polarimeter measurements during DIII-D discharges compare well with the expectations based on calculations using Thomson scattering measured density profiles and magnetic equilibrium reconstructions. Additionally, larger bandwidth interferometer measurements show that the diagnostic is a sensitive monitor of core density fluctuations with demonstrated measurements of Alfvén eigenmodes and tearing modes.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Rev Sci Instrum Year: 2018 Document type: Article Affiliation country:
Fulltext
Add to My VHL
Print
XML
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Rev Sci Instrum Year: 2018 Document type: Article Affiliation country: