Preliminary design overview and performance assessment of the ITER low-field side reflectometer

Muscatello, Christopher M.; Anderson, Clayton; Anderson, James Paul; Basile, Allan; Boivin, R. L.; Duco, Michael; Finkenthal, D. K.; Gattuso, A.; Klabacha, Jonathan; Kramer, Gerrit J.; LeSher, Michael; Meneses, Luis; Neilson, George H.; O'Neill, Ray; Peebles, William A.; Seraydarian, Raymond; Sibilia, Marc; Sichta, Paul; Sieving, David; Sirinelli, Antoine; Wang, Guiding; Wang, Wenping; Zolfaghari, Ali

doi:10.1088/1741-4326/ab7e46

Preliminary design overview and performance assessment of the ITER low-field side reflectometer

Journal Article · Fri Apr 24 00:00:00 EDT 2020 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ab7e46· OSTI ID:1603944

^[1]; Anderson, Clayton ^[1]; Anderson, James Paul ^[1]; Basile, Allan ^[2]; Boivin, R. L. ^[1]; Duco, Michael ^[2]; Finkenthal, D. K. ^[3]; Gattuso, A. ^[1]; Klabacha, Jonathan ^[2]; ^[2]; LeSher, Michael ^[1]; Meneses, Luis ^[4]; ^[2]; O'Neill, Ray ^[1]; Peebles, William A. ^[5]; Seraydarian, Raymond ^[5]; Sibilia, Marc ^[2]; Sichta, Paul ^[2]; Sieving, David ^[1]; Sirinelli, Antoine ^[4] more »

General Atomics, San Diego, CA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Palomar Scientific Instruments, San Marcos, CA (United States)
ITER Organization (France)
Univ. of California, Los Angeles, CA (United States)

The design of the ITER low-field side reflectometer (LFSR) has matured to a complete end-to-end preliminary design. LFSR will supply three key plasma measurements: (1) electron density profile, (2) electron density fluctuations, and (3) poloidal rotation. Simultaneous measurements of the three quantities are enabled by an array of six monostatic antennas which inject from an equatorial port on the outboard side of the ITER vessel. Low-loss transmission lines, consisting of corrugated, overmoded waveguide and miter bends, transmit the 30–165 GHz, O- and X-mode signals to and from the ITER plasma. Integrated transmission-line components serve a range of purposes, such as protection from high-power stray radiofrequency radiation, accommodation of transmission-line displacement, and simultaneous measurement of reference and plasma phases during the discharge. Broadband transmission signals are realized by full-band microwave transceivers combined with quasi-optical multiplexing. A field-programmable gate array (FPGA) processor demodulates the profile reflectometer signals, enabling real-time density profile measurements for plasma control system feedback. A full-scale transmission line test facility provides an integrated environment to assess the performance of critical LFSR components. Theoretical modeling together with insertion loss measurements provide the basis for a comprehensive power budget, which accounts for transmitted output power, transmission-line losses, antenna coupling, and plasma effects. Results indicate that high signal-to-noise ratios are achievable with the current design. A synthetic reflectometer model, using real design parameters and baseline ITER profiles, has been developed to estimate the return signal. With evolving microwave and data acquisition technologies, full-band, ultrafast sweeps (<1 μs) will be realizable for ITER.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 1603944

Alternate ID(s):: OSTI ID: 23013622

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 6 Vol. 60; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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