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Vector and scalar tomography for compact toroid plasmas

Author: Setthivoine You
Requested Type: Poster Only
Submitted: 2009-12-04 17:15:23

Co-authors: L. Paritsky, H. Tanabe, Y. Ono, A.L. Balandin

Contact Info:
University of Washington
238 AERB, BOX 352250
Seattle, WA   98195
USA

Abstract Text:
A pair of multichannel spectroscopic diagnostics have been installed on the TS-4 compact toroid experiment at the University of Tokyo with view chords designed for measuring 3D ion bulk flow velocities and temperatures. One set retrieves toroidal velocities and temperature from conventional Abel inversion. The second set reconstructs emissivity and temperature from computerized scalar tomography of the zeroth and second spectral moments, respectively, and poloidal velocities from 3D vector tomography of the first spectral moment. This is the first attempt to apply vector tomography reconstruction techniques to a plasma experiment. The measurements show bulk ion flow field in a 2D plane with significant cross-field flow possibly due to the slingshot effect during reconnection merging of two counter-helicity spheromaks. The results are limited by a center column and available viewports in the vacuum chamber. A second generation version of the tomographic diagnostic is being designed for a new experiment at the University of Washington using modulated optical solid state interferometers. The new version will measure the three spectral moments directly and continuously during the discharge with a sufficient number of channels for volumetric vector tomography. The aim is to track the 3D ion flow field in a single shot in a compact toroid plasma inside a singly-connected volume.

Characterization: E5

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