TOMOgraphic MOSS Spectroscopy System

TOMOSS is a tomographic spectroscopy apparatus for 2-d imaging of the plasma ion/atom temperatures and flow vorticity in the H-1 heliac. A large rotatable ring encircles the H-1NF plasma (as seen in the AutoCAD image below). The ring contains 55 lens-coupled fused silica optical fibres that relay the light to a large aperture MOSS camera that processes the light. The time-resolved interferograms are recorded using an 8 x 8multi-anode phtomultipler tube.

The leftmost image shows the TOMOSS team and the rotatable ring (foreground) that encircles the plasma, viewing it simulateously from five different directions, with eleven parallel collection lines-of-sight in each direction. The centre image shows a close-up of one of the ring sectors and the eleven lenses used to couple plasma light to the silica fibres. The rightmost image shows Mr Fenton Glass (PhD student) at work assembling the optical fibres prior to installation around the periphery of the ring.

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Questions about this page can be directed to: John Howard
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