System-on-chip approach microwave imaging reflectometer on DIII-D tokamak

Zhu, Y.; Chen, Y.; Yu, J.-H.; Domier, C.; Yu, G.; Liu, X.; Kramer, G.; Ren, Y.; Diallo, A.; Luhmann, Jr., N. C.; Li, X.

doi:10.1063/5.0099170

Title: System-on-chip approach microwave imaging reflectometer on DIII-D tokamak

Journal Article · Thu Nov 03 00:00:00 EDT 2022 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/5.0099170· OSTI ID:1899103

^[1];

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

^[1];

^[2];

^[2]; Diallo, A. ^[2]; Luhmann, Jr., N. C. ^[1]; Li, X. ^[1]

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

System-on-chip millimeter wave integrated circuit technology is used on the two-dimensional millimeter-wave imaging reflectometer (MIR) upgrade for density fluctuation imaging on the DIII-D tokamak fusion plasma. Customized CMOS chips have been successfully developed for the transmitter module and receiver module array, covering the 55–75 GHz working band. The transmitter module has the capability of simultaneously launching eight tunable probe frequencies (>0 dBm output power each). The receiver enclosure contains 12 receiver modules in two vertical lines. The quasi-optical local oscillator coupling of previous MIR systems has been replaced with an internal active frequency multiplier chain for improved local oscillator power delivery and flexible installation in a narrow space together with improved shielding against electromagnetic interference. The 55–75 GHz low noise amplifier, used between the receiver antenna and the first-stage mixer, significantly improves module sensitivity and suppresses electronics noise. The receiver module has a 20 dB gain improvement compared with the mini-lens approach and better than –75 dBm sensitivity, and its electronics noise temperature has been reduced from 55 000 K down to 11 200 K. Further, the V-band MIR system is developed for co-located multi-field investigation of MHD-scale fluctuations in the pedestal region with W-band electron cyclotron emission imaging on DIII-D tokamak.

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-99ER54531

OSTI ID:: 1899103

Journal Information:: Review of Scientific Instruments, Vol. 93, Issue 11; Conference: 24.Topical Conference on High-Temperature Plasma Diagnostics, Rochester, NY (United States), 15-19 May 2022; ISSN 0034-6748

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

Country of Publication:: United States

Language:: English

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