New millimeter-wave diagnostics to locally probe internal density and magnetic field fluctuations in National Spherical Torus Experiment-Upgrade (invited)

Macwan, T.; Barada, K.; Kubota, S.; Lantsov, R.; Bradley, L.; Pratt, Q.; Hong, R.; Michael, C. A.; Hall-Chen, V.; Wisniewski, J.; Dong, J.; Stratton, B.; Crocker, N. A.; Peebles, W. A.; Rhodes, T. L.

doi:10.1063/5.0219484

New millimeter-wave diagnostics to locally probe internal density and magnetic field fluctuations in National Spherical Torus Experiment-Upgrade (invited)

Journal Article · Tue Aug 13 00:00:00 EDT 2024 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/5.0219484· OSTI ID:2447393

^[1]; ^[1]; ^[1]; Lantsov, R. ^[1]; Bradley, L. ^[1]; ^[1]; ^[1]; ^[1]; ^[2]; ^[3]; Dong, J. ^[3]; Stratton, B. ^[3]; ^[1]; ^[1]; ^[1]

Univ. of California, Los Angeles, CA (United States)
Agency for Science, Technology and Research (A*STAR) (Singapore)
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

A set of new millimeter-wave diagnostics will deliver unique measurement capabilities for National Spherical Torus Experiment-Upgrade to address a variety of plasma instabilities believed to be important in determining thermal and particle transport, such as micro-tearing, global Alfvén eigenmodes, kinetic ballooning, trapped electron, and electron temperature gradient modes. These diagnostics include a new integrated intermediate-k Doppler backscattering (DBS) and cross-polarization scattering (CPS) system (four channels, 82.5–87 GHz) to measure density and magnetic fluctuations, respectively. The system can access reasonably large normalized wavenumbers k_θρ_s ranging from ≤0.5 to 15 (where ion sound gyroradius ρ_s = 1 cm and k_θ is the binormal density turbulence wavenumber). The system addresses the challenges for making useful DBS/CPS measurements with a remote control of launch polarization (X- or O-mode), probed wavenumber, polarization match of the launch beam with the edge magnetic field pitch angle, and beam steering of the launched beam for wave-vector alignment. In addition, a low-k DBS system consisting of eight fixed frequencies (34–52 GHz) and four tunable frequencies (55–75 GHz) for low-k density turbulence and fast ion physics will be located at a nearby port location. Finally, the combined systems cover the near LCFS and pedestal regions (34–52 GHz), the pedestal or mid-radius (50–75 GHz), and core plasmas (82.5–87 GHz).

View Accepted Manuscript (DOE)

Research Organization:: General Atomics, San Diego, CA (United States); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC02-09CH11466; FC02-04ER54698; SC0019352; SC0021150

OSTI ID:: 2447393

Alternate ID(s):: OSTI ID: 2477275

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 8 Vol. 95; ISSN 0034-6748

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

Country of Publication:: United States

Language:: English

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