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Title: A combined Phase Contrast Imaging and heterodyne interferometer for multiscale fluctuation measurements in tokamak plasmas

Abstract

An upgrade to the Phase Contrast Imaging (PCI) diagnostic on the DIII-D tokamak has successfully combined PCI with density interferometry to provide electron density fluctuation measurements across an unprecedented range in wavenumber. The combined diagnostic uses a single laser and a single beam path through the tokamak, minimizing machine resources in anticipation of future reactor-scale devices where port access will be at a premium. The PCI multichannel detector provides low-noise, wavenumber-resolved detection of moderate-wavenumber turbulence, while the interferometer channel is sensitive to long-wavelength turbulence, including the peak of ion-scale turbulence and MHD. The overlap in wavenumber range between the two schemes allows for an in situ absolute calibration of the PCI.

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [2]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
  2. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1602276
Grant/Contract Number:  
FG02-94ER54235; SC0016154; FC02-04ER54698; FC02-99ER54512; NA002135
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Instrumentation
Additional Journal Information:
Journal Volume: 14; Journal Issue: 12; Conference: 19. International Symposium on Laser-Aided Plasma Diagnostics , Whitefish, MT (United States), 22-26 Sep 2019; Journal ID: ISSN 1748-0221
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Rost, J. C., Davis, E. M., Marinoni, A., Porkolab, M., and Zeeland, M. A. Van. A combined Phase Contrast Imaging and heterodyne interferometer for multiscale fluctuation measurements in tokamak plasmas. United States: N. p., 2019. Web. https://doi.org/10.1088/1748-0221/14/12/c12023.
Rost, J. C., Davis, E. M., Marinoni, A., Porkolab, M., & Zeeland, M. A. Van. A combined Phase Contrast Imaging and heterodyne interferometer for multiscale fluctuation measurements in tokamak plasmas. United States. https://doi.org/10.1088/1748-0221/14/12/c12023
Rost, J. C., Davis, E. M., Marinoni, A., Porkolab, M., and Zeeland, M. A. Van. Tue . "A combined Phase Contrast Imaging and heterodyne interferometer for multiscale fluctuation measurements in tokamak plasmas". United States. https://doi.org/10.1088/1748-0221/14/12/c12023. https://www.osti.gov/servlets/purl/1602276.
@article{osti_1602276,
title = {A combined Phase Contrast Imaging and heterodyne interferometer for multiscale fluctuation measurements in tokamak plasmas},
author = {Rost, J. C. and Davis, E. M. and Marinoni, A. and Porkolab, M. and Zeeland, M. A. Van},
abstractNote = {An upgrade to the Phase Contrast Imaging (PCI) diagnostic on the DIII-D tokamak has successfully combined PCI with density interferometry to provide electron density fluctuation measurements across an unprecedented range in wavenumber. The combined diagnostic uses a single laser and a single beam path through the tokamak, minimizing machine resources in anticipation of future reactor-scale devices where port access will be at a premium. The PCI multichannel detector provides low-noise, wavenumber-resolved detection of moderate-wavenumber turbulence, while the interferometer channel is sensitive to long-wavelength turbulence, including the peak of ion-scale turbulence and MHD. The overlap in wavenumber range between the two schemes allows for an in situ absolute calibration of the PCI.},
doi = {10.1088/1748-0221/14/12/c12023},
journal = {Journal of Instrumentation},
number = 12,
volume = 14,
place = {United States},
year = {2019},
month = {12}
}

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