W-band system-on-chip electron cyclotron emission imaging system on DIII-D

Zhu, Y.; Yu, J. -H.; Yu, G.; Ye, Y.; Tobias, B.; Diallo, A.; Kramer, G.; Ren, Y.; Domier, C. W.; Li, X.; Luo, C.; Chen, M.; Chen, Y.; Luhmann, N. C.

doi:10.1063/5.0018082

Title: W-band system-on-chip electron cyclotron emission imaging system on DIII-D

Journal Article · Wed Sep 09 00:00:00 EDT 2020 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/5.0018082· OSTI ID:1658823

^[1]; Yu, J. -H. ^[1];

^[1]; Ye, Y. ^[1]; Tobias, B. ^[2]; Diallo, A. ^[3];

^[3]; Ren, Y. ^[3];

^[1]; Li, X. ^[4]; Luo, C. ^[1]; Chen, M. ^[1]; Chen, Y. ^[1]; Luhmann, N. C. ^[1]

Univ. of California, Davis, CA (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Univ. of Science and Technology of China, Hefei (China)

Monolithic, millimeter wave “system-on-chip” (SoC) technology has been employed in heterodyne receiver integrated circuit radiometers in a newly developed Electron Cyclotron Emission Imaging (ECEI) system on the DIII-D tokamak for 2D electron temperature profile and fluctuation evolution diagnostics. Here, a prototype module operating in E-band (72-80 GHz) was first employed in a 2 x 10 element array that demonstrated significant improvements over the previous quasi-optical Schottky diode mixer arrays during the 2018 operational campaign of the DIII-D tokamak. For compatibility with International Thermonuclear Experimental Reactor (ITER) relevant scenarios on DIII-D, the SoC ECEI system was upgraded with 20 horn-waveguide receiver modules. Each individual module contains a University of California at Davis designed W-band (75 -110 GHz) receiver die that integrates a broadband low noise amplifier (LNA), a double balanced down-converting mixer, and a x4 multiplier on the local oscillator (LO) chain. A x2 multiplier and two IF amplifiers are packaged and selected to further boost the signal strength as well as downconvert the signal frequency. The upgraded W-band array exhibits > 30 dB additional gain and 20x improvement in noise temperature comparing with the previous Schottky diode radio frequency (RF) mixer input systems; an internal 8 times multiplier chain is used to bring down the LO frequency below 12 GHz, thereby obviating the need for a large aperture for quasi-optical LO coupling and replacing it with coaxial connectors. The horn-waveguide shielding housing avoids out-of-band noise interference on each individual module. The upgraded ECEI system plays an important role for absolute electron temperature evolution and fluctuation measurements for edge and core region transport physics studies.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-99ER54531; FC02-04ER54698

OSTI ID:: 1658823

Alternate ID(s):: OSTI ID: 1658971

Journal Information:: Review of Scientific Instruments, Vol. 91, Issue 9; ISSN 0034-6748

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

Country of Publication:: United States

Language:: English

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