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Title: Technical overview of the millimeter-wave imaging reflectometer on the DIII-D tokamak (invited)

The two-dimensional mm-wave imaging reflectometer (MIR) on DIII-D is a multi-faceted device for diagnosing electron density fluctuations in fusion plasmas. Its multi-channel, multi-frequency capabilities and high sensitivity permit visualization and quantitative diagnosis of density perturbations, including correlation length, wavenumber, mode propagation velocity, and dispersion. The two-dimensional capabilities of MIR are made possible with twelve vertically separated sightlines and four-frequency operation (corresponding to four radial channels). The 48-channel DIII-D MIR system has a tunable source that can be stepped in 500 µs increments over a range of 56 to 74 GHz. An innovative optical design keeps both on-axis and off-axis channels focused at the cutoff surface, permitting imaging over an extended poloidal region. As a result, the integrity of the MIR optical design is confirmed by comparing Gaussian beam calculations to laboratory measurements of the transmitter beam pattern and receiver antenna patterns.
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [1] ;  [1]
  1. Univ. of California, Davis, CA (United States)
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Grant/Contract Number:
FC02-04ER54698
Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 85; Journal Issue: 11; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Research Org:
General Atomics, San Diego, CA (United States)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
OSTI Identifier:
1352916

Muscatello, Christopher M., Domier, Calvin W., Hu, Xing, Kramer, Gerrit J., Luhmann, Jr., Nelville C., Ren, Xiaoxin, Riemenschneider, P., Spear, Alex, Tobias, Benjamin J., Valeo, Ernest, and Yu, L.. Technical overview of the millimeter-wave imaging reflectometer on the DIII-D tokamak (invited). United States: N. p., Web. doi:10.1063/1.4889735.
Muscatello, Christopher M., Domier, Calvin W., Hu, Xing, Kramer, Gerrit J., Luhmann, Jr., Nelville C., Ren, Xiaoxin, Riemenschneider, P., Spear, Alex, Tobias, Benjamin J., Valeo, Ernest, & Yu, L.. Technical overview of the millimeter-wave imaging reflectometer on the DIII-D tokamak (invited). United States. doi:10.1063/1.4889735.
Muscatello, Christopher M., Domier, Calvin W., Hu, Xing, Kramer, Gerrit J., Luhmann, Jr., Nelville C., Ren, Xiaoxin, Riemenschneider, P., Spear, Alex, Tobias, Benjamin J., Valeo, Ernest, and Yu, L.. 2014. "Technical overview of the millimeter-wave imaging reflectometer on the DIII-D tokamak (invited)". United States. doi:10.1063/1.4889735. https://www.osti.gov/servlets/purl/1352916.
@article{osti_1352916,
title = {Technical overview of the millimeter-wave imaging reflectometer on the DIII-D tokamak (invited)},
author = {Muscatello, Christopher M. and Domier, Calvin W. and Hu, Xing and Kramer, Gerrit J. and Luhmann, Jr., Nelville C. and Ren, Xiaoxin and Riemenschneider, P. and Spear, Alex and Tobias, Benjamin J. and Valeo, Ernest and Yu, L.},
abstractNote = {The two-dimensional mm-wave imaging reflectometer (MIR) on DIII-D is a multi-faceted device for diagnosing electron density fluctuations in fusion plasmas. Its multi-channel, multi-frequency capabilities and high sensitivity permit visualization and quantitative diagnosis of density perturbations, including correlation length, wavenumber, mode propagation velocity, and dispersion. The two-dimensional capabilities of MIR are made possible with twelve vertically separated sightlines and four-frequency operation (corresponding to four radial channels). The 48-channel DIII-D MIR system has a tunable source that can be stepped in 500 µs increments over a range of 56 to 74 GHz. An innovative optical design keeps both on-axis and off-axis channels focused at the cutoff surface, permitting imaging over an extended poloidal region. As a result, the integrity of the MIR optical design is confirmed by comparing Gaussian beam calculations to laboratory measurements of the transmitter beam pattern and receiver antenna patterns.},
doi = {10.1063/1.4889735},
journal = {Review of Scientific Instruments},
number = 11,
volume = 85,
place = {United States},
year = {2014},
month = {7}
}