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Overview of HIT-SI Progress and Results

Author: Aaron C. Hossack
Requested Type: Poster Only
Submitted: 2012-12-07 15:17:53

Co-authors: B.S. Victor, C. Akcay, B.T. Doty, D.A. Ennis, R.P. Golingo, C.J. Hansen, T.R. Jarboe, K.D. Morgan, B.A. Nelson, R.J. Smith, D.A. Sutherland, G.J. Marklin

Contact Info:
University of Washington
AERB Rm. 120, BOX 352250
Seatle, WA   98125
USA

Abstract Text:
The HIT-SI program investigates the formation and sustainment of toroidal current in a simply-connected volume through the use of inductive helicity injectors. High current amplification shots, with toroidal current up to 3 times the injector currents [B.S. Victor et al., Phys. Rev. Lett. 107, 165005 (2011)], have led to new insights into the current drive process. The Imposed-Dynamo Current Drive (IDCD) model describes a process where the toroidal current is driven directly by injector driven fluctuations [T.R. Jarboe et al., Nucl. Fusion 52, 083017 (2012)]. The IDCD model accurately predicts the toroidal current and λ profile. Surface and internal magnetic field measurements show qualitative agreement with computational results from 2-fluid simulations using NIMROD. Simultaneous measurements of ion velocity using up to 20 chords are presented and show features similar to NIMROD fluid velocities. Recent operations have increased injector driving frequency from 14.5 to near 40 kHz. Higher frequency operations are analyzed with data from an FIR interferometer, IDS, magnetic probes, a high-speed imaging system, and a Langmuir probe. A helicon electrodeless plasma source has been installed to facilitate plasma breakdown. Progress on HIT-SI3 and a new Thomson scattering system is given. Work supported by USDoE.

Characterization: 1.1

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