UC Davis PDG:Electron Temperature Fluctuations on TEXT-U

Shown in the left is the cross power spectral density of two imaging channels separated by 2.7 cm across the plasma midplane. The peak frequency decreases towards the edge of the plasma whereas the amplitude increases. Shown in the right is the measured statistical dispersion relation of the fluctuations. A linear curve fit gives a phase velocity of 4.0x1e5 cm/sec , which agrees with the theoretical predictions for drift wave fluctuations.

For further technical details, and ECE Imaging measurements and results from TEXT-U, please examine the following links:

2-D temperature profiles
2-D temperature images
Temperature profile evolution during sawteeth activity
Temperature profile evolution during tearing mode activity
Temperature snakes observed during high power ECRH

The unique features of the ECE Imaging diagnostics derive from the use of wideband, low cost monolithic and hybrid Schottky diode mixer arrays. Follow the links below to learn more about both the technology and the techniques employed in ECE Imaging.

Imaging array design and fabrication
Correlation Measurements

UC Davis has fabricated and installed multichannel ECE Imaging systems on other fusion plasma tokamaks across the world. Follow the links below for a description of the systems involved, and to sample data collected with these systems.

ECE Imaging on the RTP tokamak in the U.S.A.
ECE Imaging on the TEXTOR tokamak in Germany

Comments to: Bihe Deng