Demonstration of a two-dimensional divertor Thomson scattering system on DIII-D

Recent upgrades providing two-dimensional divertor Thomson scattering (DTS-2D) measurements of Te and ne during a DIII-D plasma shot and a thorough description of system components and their functionality are presented. This system expands the capabilities of the existing single divertor Floor measu...

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Veröffentlicht in:Review of scientific instruments 2023-12, Vol.94 (12)
Hauptverfasser: Schroeder, Paul J., Glass, Fenton, O’Gorman, Thomas, Carlstrom, Thomas N., McLean, Adam G., Watkins, Matthias, Taussig, Doug A., Boivin, Rejean L.
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container_end_page
container_issue 12
container_start_page
container_title Review of scientific instruments
container_volume 94
creator Schroeder, Paul J.
Glass, Fenton
O’Gorman, Thomas
Carlstrom, Thomas N.
McLean, Adam G.
Watkins, Matthias
Taussig, Doug A.
Boivin, Rejean L.
description Recent upgrades providing two-dimensional divertor Thomson scattering (DTS-2D) measurements of Te and ne during a DIII-D plasma shot and a thorough description of system components and their functionality are presented. This system expands the capabilities of the existing single divertor Floor measurement location by introducing seven additional laser beam path options in the poloidal plane, spanning major radii from 1.062 to 1.335 m. The system redirects ∼1 J, 50 Hz Nd:YAG laser pulses to the new beam paths within 20 ms, stepping through each path on the divertor Floor every 200 ms during a plasma shot. The laser is redirected using an ex-vessel, fast-steering mirror to one of eight in-vessel beam paths oriented underneath the vessel tiles. Up to eleven measurement positions per beam path, from −1.35 to −1.13 m below the machine midplane, are available by dynamically refocusing the ex-vessel collection fiber array using a high-speed linear stage. Current measurement positions above the divertor Shelf are retained via a hole in the fixed, in-vessel mirror, allowing laser pass through.
doi_str_mv 10.1063/5.0173911
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subjects 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Electrons
Floors
Laser beams
Lasers
Neodymium lasers
Semiconductor lasers
Steering
Thomson scattering
Vessels
YAG lasers
title Demonstration of a two-dimensional divertor Thomson scattering system on DIII-D
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