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A 20 kHz, 1.2 J, 20 ns pulse-burst laser for electron temperature and density measurement in a magnetically confined high-temperature plasma

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In order to deepen understanding of transient phenomena in magnetically confined plasmas, a high-time resolution (up to 20 kHz) Thomson scattering diagnostic system for measurement of electron temperature and density profiles has been developed. A key system component is a Nd: YAG laser which produces a burst of 1.2 J, 20 ns pulses. This diagnostic system is used to investigate transient plasma phenomena such as electron cyclotron heating, the injection of hydrogen pellets, and plasma collapse.

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