Multichannel laser light scattering diagnostics for density profile measurements in belt pinch plasmas

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Abstract
A multichannel laser light scattering system with high sensitivity has been applied to Thomson scattering measurements of electron density profiles by a single laser shot. The problems inherent to radial profile measurements of toroidal plasmas were overcome and the stray light level could be lowered to ne =1013 cm−3 equivalent. This diagnostics was used for optimizing the preheating discharge in the Garching High-Voltage Belt Pinch at low densities ne?1013 cm−3.

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