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Title: Low-noise heterodyne receiver for electron cyclotron emission imaging and microwave imaging reflectometry

The critical component enabling electron cyclotron emission imaging (ECEI) and microwave imaging reflectometry (MIR) to resolve 2D and 3D electron temperature and density perturbations is the heterodyne imaging array that collects and downconverts radiated emission and/or reflected signals (50-150 GHz) to an intermediate frequency (IF) band (e.g. 0.1-18 GHz) that can be transmitted by a shielded coaxial cable for further filtering and detection. New circuitry has been developed for this task, integrating gallium arsenide (GaAs) monolithic microwave integrated circuits (MMICs) mounted on a liquid crystal polymer (LCP) substrate. The improved topology significantly increases electromagnetic shielding from out-of-band interference, leads to 10x improvement in the signal-to-noise ratio, and dramatic cost savings through integration. The current design, optimized for reflectometry and edge radiometry on mid-sized tokamaks, has demonstrated >20 dB conversion gain in upper V-band (60-75 GHz). As a result, implementation of the circuit in a multi-channel electron cyclotron emission imaging (ECEI) array will improve the diagnosis of edge-localized modes and fluctuations of the high-confinement, or H-mode, pedestal.
Authors:
 [1] ; ORCiD logo [2] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. Univ. of California, Davis, CA (United States)
Publication Date:
Report Number(s):
5274
Journal ID: ISSN 0034-6748; RSINAK; TRN: US1701766
Grant/Contract Number:
AC02-09CH11466; FG02-99ER54531
Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 87; Journal Issue: 11; Conference: 21st Topical Conference on High-Temperature Plasma Diagnostics, Madison, WI (United States), 5-9 Jun 2016; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Research Org:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org:
USDOE
Contributing Orgs:
University of California at Davis, Davis, California 95616, USA
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1340112

Tobias, B., Domier, C. W., Luhmann, Jr., N. C., Luo, C., Mamidanna, M., Phan, T., Pham, A. -V., and Wang, Y.. Low-noise heterodyne receiver for electron cyclotron emission imaging and microwave imaging reflectometry. United States: N. p., Web. doi:10.1063/1.4959273.
Tobias, B., Domier, C. W., Luhmann, Jr., N. C., Luo, C., Mamidanna, M., Phan, T., Pham, A. -V., & Wang, Y.. Low-noise heterodyne receiver for electron cyclotron emission imaging and microwave imaging reflectometry. United States. doi:10.1063/1.4959273.
Tobias, B., Domier, C. W., Luhmann, Jr., N. C., Luo, C., Mamidanna, M., Phan, T., Pham, A. -V., and Wang, Y.. 2016. "Low-noise heterodyne receiver for electron cyclotron emission imaging and microwave imaging reflectometry". United States. doi:10.1063/1.4959273. https://www.osti.gov/servlets/purl/1340112.
@article{osti_1340112,
title = {Low-noise heterodyne receiver for electron cyclotron emission imaging and microwave imaging reflectometry},
author = {Tobias, B. and Domier, C. W. and Luhmann, Jr., N. C. and Luo, C. and Mamidanna, M. and Phan, T. and Pham, A. -V. and Wang, Y.},
abstractNote = {The critical component enabling electron cyclotron emission imaging (ECEI) and microwave imaging reflectometry (MIR) to resolve 2D and 3D electron temperature and density perturbations is the heterodyne imaging array that collects and downconverts radiated emission and/or reflected signals (50-150 GHz) to an intermediate frequency (IF) band (e.g. 0.1-18 GHz) that can be transmitted by a shielded coaxial cable for further filtering and detection. New circuitry has been developed for this task, integrating gallium arsenide (GaAs) monolithic microwave integrated circuits (MMICs) mounted on a liquid crystal polymer (LCP) substrate. The improved topology significantly increases electromagnetic shielding from out-of-band interference, leads to 10x improvement in the signal-to-noise ratio, and dramatic cost savings through integration. The current design, optimized for reflectometry and edge radiometry on mid-sized tokamaks, has demonstrated >20 dB conversion gain in upper V-band (60-75 GHz). As a result, implementation of the circuit in a multi-channel electron cyclotron emission imaging (ECEI) array will improve the diagnosis of edge-localized modes and fluctuations of the high-confinement, or H-mode, pedestal.},
doi = {10.1063/1.4959273},
journal = {Review of Scientific Instruments},
number = 11,
volume = 87,
place = {United States},
year = {2016},
month = {7}
}