Contacts: Quinn Pratt, Stephen Storment

Short Description

Multi-channel Doppler back-scattering (DBS) diagnostic analysis


DBS, Flow Velocity, Turbulence, Density Fluctuations

Long Description

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).

Typical workflows

  • 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

Supported devices

  • DIII-D

  • MAST


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


List of usernames sorted by number of module imports: ashourvana, prattq, ernst, smithsp, hongrongjie, yuguanying, houshman, kobayashi, fernandezp, grierson, krietedm, meneghini, schmitzl