Author/Authors :
Sasao، نويسنده , , H and Inagaki، نويسنده , , S and Nagayama، نويسنده , , Y and de Vries، نويسنده , , P.C and Kawahata، نويسنده , , K and Watanabe، نويسنده , , K.Y and Tokuzawa، نويسنده , , T and Tanaka، نويسنده , , K and Kubo، نويسنده , , S and Narihara، نويسنده , , K and Komori، نويسنده , , A and Yamada، نويسنده , , H and Kaneko، نويسنده , , O and Motojima، نويسنده , , O، نويسنده ,
Abstract :
The second harmonic X-mode electron cyclotron emission (ECE) from high-density plasma (the electron density is more than 50% of the cut-off density) is analyzed taking into account the refractive index and the influence of polarization in low field operated large helical device (LHD) (the magnetic field B0=1.5 T). The density dependence of ECE is obtained and compared with the predictions of a theoretical model. It is concluded that the density dependence significantly influences the measurement of Te by ECE in LHD.
