Contacts: Quinn Pratt, Stephen Storment
Multi-channel Doppler back-scattering (DBS) diagnostic analysis
The OMFIT - DBS module provides an integrated approach to visualizing and analyzing data from the UCLA multi-channel Doppler back-scattering (DBS) diagnostics installed on the DIII-D and MAST(U) tokamaks. Data from both DIII-D V-band systems (one at the 60-deg port, another at the 240-port) along with legacy systems (e.g. W-band, ‘DBS5’) are available for processing. Detailed analysis over a multiple times (usually order ~ 10) is a primary feature of this module. DBS quadrature spectrum fitting is used for Doppler shift calculation. Ray tracing (GENRAY) is used to calculate scattering parameters. DBS outputs include: turbulent wavenumbers, turbulent flow velocity, radial electric field, omega_E. Most module features are also available for the Q and V band DBS systems installed on the MAST(U) tokamak (provided the user has access to CCFE computer systems).
Fetch raw DBS data
DBS spectrum analysis and visualization
Doppler shift calculation from the DBS quadrature spectrum
GENRAY setup with EFIT and Profiles
Run GENRAY with DBS parameters
Calculate derived quantities and plot
Peebles, W. A., et al. “A novel, multichannel, comb-frequency Doppler backscatter system.” Review of Scientific Instruments 81.10 (2010): 10D902.
Rhodes, T. L., et al. “Optimized quasi-optical cross-polarization scattering system for the measurement of magnetic turbulence on the DIII-D tokamak.” Review of Scientific Instruments 89.10 (2018): 10H107.
List of contributors sorted by number of lines authored:
23107 Quinn Pratt 658 Stephen Storment 123 Clive Michael 15 Orso Meneghini 2 Bhavin Patel 1 Fusion Bot