A high spatial resolution (3 mm full width half maximum, i.e. 2% of the minor radius) double-pulse multiposition Thomson scattering system was in operation at the Rijnhuizen tokamak project RTP from March 1996 until September 1998. It upgrades the previously installed single-pulse Thomson scattering system. Two measurements of full electron temperature, T e , and density, n e , profiles can be performed in rapid succession during one plasma discharge, using a double-pulsed laser and a dual charge-coupled-device camera system. The temporal resolution is determined by the separation time between the two subsequent laser pulses and can be tuned in the range 20-800 µs. Typical relative experimental errors are 3-5% for T e and 2-4% for n e at n e = 5 × 10 19 m -3 . Plasma experiments show the application of the diagnostic; double-pulse Thomson scattering measurements have been performed on high- n e ohmic plasmas with large m / n = 2/1 magnetohydrodynamic activity, centrally heated plasmas with filaments (i.e. high T e peaks) applying electron cyclotron heating, plasmas with a transient central T e -rise after oblique pellet injection showing central filaments, and off-axis heated plasmas with off-axis sawtooth activity. The double-pulse feature of the diagnostic enables the study of the dynamics of T e and n e profiles in these plasmas.
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Beurskens et al. (1999) studied this question.
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