Contacts: Quinn Pratt, Stephen Storment
The OMFIT - DBS module provides an integrated approach to 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 analysis. On MAST(U) we support data from both V-band and Q-band systems. Analysis is generally performed over multiple times slices (usually order ~ 10) which are 20-200 ms (typical) in length. Labor-intensive frequency-domain analysis (fitting Doppler-shifted spectral components) is possible with the DBS_SPECTROGRAM_GUI. Ray tracing (using GENRAY) is used to calculate scattering parameters. We also support 3D beam-tracing with the SCOTTY and TORBEAM codes. DBS outputs include: probed radial locations, probed wavenumbers wavenumbers, flow velocity of turbulent structures, radial electric field, omega_E.
Fetch raw DBS data
(Optional) ELM filtering
- DBS spectrum analysis and visualization
Doppler shift calculation
Spectral power calculation
GENRAY/SCOTTY/TORBEAM setup with EFIT geqdsk and profiles (OMFITprofile, pFiles, input.gacode, etc…)
Run Ray/Beam tracing with DBS launch parameters
Calculate derived quantities and plot
Plan for experiments (ray tracing angle-scans)
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:
24763 Quinn Pratt 658 Stephen Storment 123 Clive Michael 13 Will DeShazer 11 Orso Meneghini 2 Bhavin Patel 1 Fusion Bot