Typical results of cross correlation measurements. The cross power spectral density and cross phases are calculated from two signals of vertically separated mixer channels. The wavenumbers are calculated from the cross phases and the channel spacing. Two modes are distinguished: the low frequency mode is the MHD mode, and the high frequency mode is the turbulent mode.

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

Further technical details on the RTP ECE Imaging system
High resolution measurements of electron temperature profiles
Electron temperature fluctuation spectra
Electron temperature fluctuations as a function of plasma current and density
2D structure of electron temperature fluctuations

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

 Comments to: Bihe Deng