|
UC
Davis PDG:Te
Profile Evolution on RTP
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The evolution of Te profiles shown above is obtained in an
RTP discharge with 
kA, 
=
3?1019
m-3, and 
=
2.03 T.The electron cyclotron resonance
heating (ECRH) power is deposited at a minor radius of about 4 cm (3 cm
below the midplane, and 2.5 cm to the low field side), and is switched
off at 305 ms. It is seen that the Te profile is centrally peaked,
and is quite stable in the ECRH phase (300 - 305 ms). After cessation of
ECRH, the temperature profile does not smoothly evolve to the centrally
peaked profile of Ohmic discharges, as would usually be expected. Instead,
the temperature of the core region (r < 2 cm), the annular region (2
< r < 4 cm), and the outside region have different time evolution.
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 fluctuation dispersion relations
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