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ach_epr_2014-1.pdf2014-08-12 12:24:56Aaron Hossack
ach_epr_2014.pdf2014-08-12 12:23:14Aaron Hossack

Plasma dynamics in HIT-SI using ion Doppler spectroscopy with comparisons to simulations

Author: Aaron C. Hossack
Requested Type: Poster Only
Submitted: 2014-05-29 19:01:03

Co-authors: C. Akcay, T. R. Jarboe, C. J. Hansen, K. D. Morgan, B. A. Nelson, B. S. Victor

Contact Info:
University of Washington
AERB Rm. 120
Seattle, WA   98195
USA

Abstract Text:
Initial results are presented from comparisons between ion Doppler spectroscopy data and the NIMROD and PSI-TET codes. Data was collected from HIT-SI with toroidal currents of 80 – 90 kA at a helicity injector driving frequency of 14.5 kHz. The IDS system consists of two fiber optic bundles which simultaneously route light from up to 42 different chords through a 1 meter monochrometer to a Phantom fast camera CCD detector. The camera frame rate is approximately 145 kHz, or 10 times the injector frequency. Results from C III emission indicate no net toroidal flow and velocity oscillations of order 10 km/s at the injector frequency. Measurements in the poloidal plane show bulk plasma motion at the injector frequency with no net flow. Data are compared with synthetic diagnostic output and velocity fields from NIMROD and PSI-TET simulations. Both simulation programs evolve the Hall-MHD equations with dynamic density and temperature. Additionally, biorthogonal decomposition of measured and synthetic spectroscopy data is presented as a noise filtering and analysis technique. Work supported by USDoE and ARRA.

Characterization: 3.0,4.0

Comments:
Please group with other HIT-SI presentations.

Workshop on Exploratory Topics in Plasma and Fusion Research (EPR) and US-Japan Compact Torus (CT) Workshop
August 5-8, 2014
Madison, Wisconsin

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