Abstract
The Thomson scattering system on the tokamak T-10 was upgraded in 2016. The new system is based on previous diagnostic with replacement of main components: laser, fiber bundle and camera. It is the first TS system combining Nd:YAG laser with a TV registration. Previous laser was replaced by a new 100 Hz Nd:YAG laser working during the whole plasma discharge on the second harmonic (λ = 532 nm) with pulse energy of 2,5 J and a duration of 10 ns. A multi-pass system with 5 passes of the beam through the plasma volume is used to inject laser light into the vacuum chamber. The scattered light is transported to the spectrometer by means of a new fiber-optic bundle providing a high spatial resolution of 5 mm over the full plasma diameter of 600 mm. An image intensifier with a GaAs photocathode and a P43 phosphor is used for detection. Fast CMOS camera Vision Research Phantom V7.3 captures images and allows to measure background plasma light between laser pulses. The diagnostic worked during three experimental campaigns and demonstrated the operability in various plasma regimes.
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