Joint European Torus (JET) Design Study 8.3: Quasi-Continuous Laser Scattering. Part 2: Extension to Spatial Scan

摘要

The use of several lasers in parallel for measuring electron density and temperature in a 90 deg scattering experiment is discussed. The lasers are synchronized with an accuracy better than the gating time of the detection system, and the beams combined by mirrors to form an array of parallel beams. The optical path of the laser beam traverses the torus vessel twice. Fiber optics of high purity fused quartz transmit the collected light to the detector system outside the torus hall. The ratio of Raman to Rayleigh cross section for hydrogen and deuterium was measured in a scattering cell near atmospheric pressure using an argon ion laser. A 13 J, 20 ns laser beam was passed through a plasma in ASDEX, and the results compared with the parameters of the scattering experiment on jet.