Turbulence Spectrum Observed in a Collision-Freeθ-Pinch Plasma by CO2Laser Scattering

Abstract
Turbulence generated by a rapidly imploding current sheath in a high-voltage θ pinch has been investigated by CO2 laser scattering and by emission spectroscopy of forbiddenline satellites in helium. Waves indicative of a saturated ion-sound instability are seen in the current sheath. In a region well behind the sheath, waves are seen with wave numbers near kD. These waves may be the result of mode coupling from short-wave-number turbulence generated earlier by the passage of the current sheath.