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Edge Density Profile Measurement by Using Ultrashort Pulsed Radar Reflectometer on LHD
tokihiko Tokuzawa,K. Kawahata,K. Tanaka 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
We have installed a ten-channel Ka-band ultrashort pulsed radar reflectometer system which uses an ultrashort sub-cycle pulse and performed an edge electron density profile measurement in the Large Helical Device. The delay time of the reflected pulses from each cut-off layer in the plasma is measured by a time-of-flight measurement technique in order to avoid a mixture of the radiation effect and spurious reflection. The electron density profile is obtained by reconstruction by using an Abel inversion method from the profile of the delay time as a function of the probing frequency. In the density modulation experiment, the time evolution of the reconstructed density profile is used for the particle transport study.I