Design of a new Nd:YAG Thomson scattering system for MAST

Scannell, R.; Walsh, M. J.; Carolan, P. G.; Darke, A. C.; Dunstan, M. R.; Huxford, R. B.; McArdle, G.; Morgan, D.; Naylor, G.; O’Gorman, T.; Shibaev, S.; Barratt, N.; Gibson, K. J.; Tallents, G. J.; Wilson, H. R.
October 2008
Review of Scientific Instruments;Oct2008, Vol. 79 Issue 10, p10E730
Academic Journal
A new infrared Thomson scattering system has been designed for the MAST tokamak. The system will measure at 120 spatial points with ≈10 mm resolution across the plasma. Eight 30 Hz 1.6 J Nd:YAG lasers will be combined to produce a sampling rate of 240 Hz. The lasers will follow separate parallel beam paths to the MAST vessel. Scattered light will be collected at approximately f/6 over scattering angles ranging from 80° to 120°. The laser energy and lens size, relative to an existing 1.2 J f/12 system, greatly increases the number of scattered photons collected per unit length of laser beam. This is the third generation of this polychromator to be built and a number of modifications have been made to facilitate mass production and to improve performance. Detected scattered signals will be digitized at a rate of 1 GS/s by 8 bit analog to digital converters (ADCs.) Data may be read out from the ADCs between laser pulses to allow for real-time analysis.


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