A two-dimensional Thomson scattering system for ATF

The authors report a two-dimensional Thomson scattering system being designed for ATF. The system will provide electron temperature and density measurements at fifteen points along a vertical chord with each laser shot. By relocating the laser beam, and reconfiguring the input optics on subsequent laser shots, a two-dimensional electron temperature and density map of the ATF cross-section can be obtained. Translating and rotating mirrors are used to relay the light from the viewing port to a fixed focal length lens. Low temperature (2 eV to 200 eV), intermediate temperature (10 eV to 1 keV), and high temperature (20 eV to 2keV) spectrometers are used. At the output of each spectrometer dispersed light is detected by an array of five, seven, or eight photomultiplier tubes depending on the temperature range of the spectrometer. Source light will be provided by a twenty-five joule low divergence ruby laser