DBS¶
Contacts: Unattributed
Short Description¶
Multi-channel Doppler back-scattering (DBS) diagnostic analysis
Long Description¶
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. On DIII-D, DBS data from systems located at the 60-deg and 240-deg (toroidal) ports are available for analysis. For older DIII-D discharges, legacy (e.g. the W-band and “DBS-5”) systems are also available. On MAST(U), DBS data from the V-band and Q-band systems are available for analysis.
Experimental DBS data analysis is generally performed over multiple times slices within a single plasma discharge.
Labor-intensive frequency-domain analysis (fitting Doppler-shifted spectral components) is possible with the DBS_SPECTROGRAM_GUI
. Ray-tracing (using GENRAY
) or beam-tracing (using Scotty
or TORBEAM
) is used to calculate wave trajectories and probed-wavenumbers.
Outputs of DBS analysis include: amplitude of density fluctuations, the DBS probed radial location(s) and probed wavenumber(s), flow velocity of turbulent structures, radial electric field, E_r
, and omega_E=E_r/RBp
.
Typical workflows¶
Fetch raw DBS data
(Optional) ELM filtering
DBS spectrum analysis and visualization
Doppler shift calculation
Spectral power calculation
GENRAY
/SCOTTY
/TORBEAM
setup with magnetic equilibria (gEQDSK
files fromEFIT
) and profiles (supported formats include: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, wavenumber targeting)
Supported devices¶
DIII-D
MAST
NSTX
Citing the DBS module¶
If you use the OMFIT-DBS module in your analysis consider citing the following paper, .. code-block:: none
- @article{DBS2025,
author = {Q. T. Pratt, T. L. Rhodes and T. A. Carter}, title = {Doppler Backscattering Data Analysis and Integrated Modeling with OMFIT}, journal = {Fusion Science and Technology}, volume = {0}, number = {0}, pages = {1–23}, year = {2025}, publisher = {American Nuclear Society}, doi = {10.1080/15361055.2025.2452128}, URL = {https://doi.org/10.1080/15361055.2025.2452128}, eprint = {https://doi.org/10.1080/15361055.2025.2452128}
}
Contributors¶
List of contributors sorted by number of lines authored:
24325 Quinn Pratt
644 Stephen Storment
120 Clive Michael
15 Torrin Bechtel
12 Will DeShazer
11 Orso Meneghini
2 kgage
2 Bhavin Patel
1 Fusion Bot
Users¶
List of usernames sorted by number of module imports: macwant, prattq, dambaj, cmichael, hongrongjie, zeng, trhodes, chowdhurys, ashtonkeya, callahank, pshi, storments, fh3490, yuguanying, cn8435, yeoha, baradakk, zm2756, wangg, gagek, bpatel2, wangy, crocker, jiahongray, farreh, ernst, kg7356, rhodes, verao, ashourvana, hallchenv, kn7062, dk4283, tmacwan2, lyonss, ravi, simeonnachmannn, smithsp, kimsang, wudonggui, yangseongmoo, happelt, jruizru, liud, niraje, sliefj, traversop, vchen, hanxiang, houshman, khabanovf, kobayashi, kq9832, lizeyu, meneghini, ncrocker, schmitzl, asladkom, degrandchampg, dingsiye, fernandezp, grierson, haskeysr, krietedm, liul, ly8590, mcclenaghanj, michaelc, ml3806, peebles, stewarts, weixishuo, xchen