11 citations · 32 across the 10 of their papers we have counts for
10 papers
Real-time steerable frequency-stepped Doppler Backscattering (DBS) System for local helicon wave electric field measurements on the DIII-D tokamak
S. Chowdhury, N. A. Crocker, W. A. Peebles +11
A new frequency-stepped Doppler backscattering (DBS) system has been integrated with a real-time steerable electron cyclotron heating launcher to probe local background turbulence…
Characterization of mesoscopic turbulent transport events with long-radial-range correlation in DIII-D H-mode plasmas
R. Hong, T. L. Rhodes, Y. Ren +6
A dimensionless collisionality scan has been performed in H-mode plasmas on DIII-D tokamak, with detailed measurements of intermediate-to-high wavenumber turbulence using Doppler b…
A novel Doppler backscattering (DBS) system to simultaneously monitor radio frequency plasma fluctuations and low frequency turbulence
S. Chowdhury, N. A. Crocker, W. A. Peebles +6
A novel quadrature Doppler Backscattering (DBS) system has been developed and optimized for the E-band (60-90GHz) frequency range using either O-mode or X-mode polarization in DIII…
Effect of mismatch on Doppler backscattering in MAST and MAST-U plasmas
Valerian H. Hall-Chen, Felix I. Parra, Jon C. Hillesheim +14
The Doppler backscattering (DBS) diagnostic, also referred to as Doppler reflectometry, measures turbulent density fluctuations of intermediate length scales. However, when the bea…
Validating and optimising mismatch tolerance of Doppler backscattering measurements with the beam model
Valerian H. Hall-Chen, Julius Damba, Felix I. Parra +11
We use the beam model of Doppler backscattering (DBS), which was previously derived from beam tracing and the reciprocity theorem, to shed light on mismatch attenuation. This atten…
Observation of Long-Radial-Range-Correlation in Turbulence in High-Collisionality High-Confinement Fusion Plasmas
R. Hong, T. L. Rhodes, P. H. Diamond +6
We report on the observation of spatially asymmetric turbulent structures with a long radial correlation length in the core of high-collisionality H-mode plasmas on DIII-D tokamak.…
Ray-tracing Analysis for Cross-polarization Scattering Diagnostic on MAST-Upgrade Spherical Tokamak
R. Hong, T. L. Rhodes, G. Wang +1
A combined Doppler backscattering/cross-polarization scattering (DBS/CPS) system is being deployed on MAST-U, for simultaneous measurements of local density turbulence, turbulence…
The deteriorating effect of plasma density fluctuations on microwave beam quality
Alf Köhn, Max E. Austin, Michael W. Brookman +13
Turbulent plasma edge density fluctuations can broaden a traversing microwave beam degrading its quality. This can be a problem for scenarios relying on a high spatial localization…
Resolving ECRH deposition broadening due to edge turbulence in DIII-D by heat deposition measurement
Michael W Brookman, Matthew B Thomas, Jarrod Leddy +7
Interaction between microwave power, used for local heating and mode control, and density fluctuations can produce a broadening of the injected beam, as confirmed in experiment and…
Resolving ECRH deposition broadening due to edge turbulence in DIII-D by 3D full-wave simulations
Matthew B Thomas, Michael W Brookman, Max E Austin +5
Edge plasma density fluctuations are shown to have a significant effect on the electron cyclotron resonance heating (ECRH) beam in the DIII-D tokamak. Experimental measurements of…