High-frequency harmonic generation in a toroidal magnetized laboratory plasma and detection of plasma turbulence

Abstract

We show for the first time experimentally that plasma turbulence can be detected easily when an electromagnetic extraordinary wave launched from the inner side of a toroidal magnetized plasma reaches a turbulent resonance layer. The second-harmonic wave generated inside the resonance layer is detected from outside the magnetized plasma and its power spectrum is analyzed. This new technique could be developed for distant probing of plasma turbulence.

Harmonic generation in the interaction of laser with a magnetized overdense plasma

“…Harmonic generation has been used as a distant probe for the detection of turbulence in a toroidal magnetically confined plasma (Ajendouz et al. 2007). Polarization measurement of harmonics has also been used to detect the poloidal magnetic field profile in tokamak devices (Cano, Fidone & Hosea 1975).…”

“…It is considered as one of the most efficient techniques known for obtaining EM waves of higher frequency in a controlled manner (Dromey et al 2006;Tsakiris et al 2006). Harmonic generation has been used as a distant probe for the detection of turbulence in a toroidal magnetically confined plasma (Ajendouz et al 2007). Polarization measurement of harmonics has also been used to detect the poloidal magnetic field profile in tokamak devices (Cano, Fidone & Hosea 1975).…”