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

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.

doi:10.1063/1.4889735

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

Journal Article · Tue Jul 22 00:00:00 EDT 2014 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4889735· OSTI ID:1352916

Muscatello, Christopher M. ^[1]; Domier, Calvin W. ^[1]; Hu, Xing ^[1]; Kramer, Gerrit J. ^[2]; Luhmann, Jr., Nelville C. ^[1]; Ren, Xiaoxin ^[1]; Riemenschneider, P. ^[1]; Spear, Alex ^[1]; Tobias, Benjamin J. ^[2]; Valeo, Ernest ^[1]; Yu, L. ^[1]

Univ. of California, Davis, CA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

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.

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Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: FC02-04ER54698

OSTI ID:: 1352916

Journal Information:: Review of Scientific Instruments, Vol. 85, Issue 11; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 22 works

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References (12)

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Cited By (2)

A new method of out-of-focus millimeter wave imaging in fusion plasma diagnostics using Bessel beams Li, J. X.; Zhu, Y. L.; Chen, M. Review of Scientific Instruments, Vol. 89, Issue 9 https://doi.org/10.1063/1.5012778	journal	September 2018
Millimeter-wave system-on-chip advancement for fusion plasma diagnostics Yu, J. -H.; Chang, Y. -T.; Lin, K. -Y. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5035559	journal	October 2018

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