Measurement of electron Bernstein wave emission to search the optimum injection condition to heat the central region of the extremely high dense plasma

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For the electron cyclotron heating (ECH) in over-dense plasmas by launching the electron cyclotron (EC) wave from the low magnetic field side, the electron Bernstein wave (EBW) excited via the ordinary - extraordinary - EBW (OXB) mode conversion process is used. To excite the EBW, the ordinary mode should be launched toward the restricted range of the injection angle, so called "OXB mode conversion window". The EBW emitted thermally in the electron cyclotron resonance (ECR) layer in the over-dense region, can be radiated as an electromagnetic wave via the B-X-O mode conversion process, which is the reverse process of the heating. To survey the "OXB mode conversion window" experimentally, an waveguide switch was installed in the middle of the ECH transmission line to send the emission from the plasma to a heterodyne radiometer system. As the first results, we have observed emission with the radiometer when an over-dense plasma is generated.