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P: Fachverband Plasmaphysik

P 11: Diagnostische Methoden

P 11.3: Vortrag

Mittwoch, 21. März 2007, 12:00–12:15, 6C

Real time density control using CO2 dispersion interferometer at TEXTOR — •Mikhael Mitri¹, Andrej Lizunov², Bernd Schweer¹, and Wolfgang Biel¹ — ¹Institut für Plasmaphysik, Forschugzentrum Jülich — ²Budker Institute of Nuclear Physics, Novosibirsk, Russia

The line-integrated electron density in TEXTOR tokamak is being measured with a new dispersion interferometer based on the different dispersion of the fundamental and second harmonics of a continuous CO$_{2}$ laser, in which the beams are guided coaxially twice through the TEXTOR plasma. In order to compare the phase shift of both wavelength, the fundamental frequency is doubled again after plasma passage. The line-averaged density is calculated in real time with 50 kHz resolution, and used for the density control at TEXTOR. One channel is now in operation and 10 to 16 channels will be installed in Summer 2007, in which five of them will be used for density and horizontal plasma position control in real-time. The control system is fully digitalized and all channels are synchronized.