|ajr_icc2006_posterv3.pdf||2006-02-21 12:43:29||Aaron Redd|
OVERVIEW OF THE HELICITY INJECTED TORUS PROGRAM
Author: Aaron J. Redd
Submitted: 2005-12-21 19:34:24
University of Washington
Box 352250, University of Wash
Seattle, WA 98195-2
The Helicity Injected Torus with Steady Inductive Helicity Injection (SIHI)
spheromak experiment (HIT-SI) [1,2] addresses critical issues for spheromaks,
including current drive, high-beta operation, and confinement quality.
HIT-SI features an optimized high-beta plasma shape and current profile,
minimal plasma-wall interaction, and the long-term goal of steady-state
operation. HIT-SI has a "bow-tie" shaped axisymmetric confinement region
(major radius R=0.33 m, axial extent of 0.57 m) and two half-torus helicity
injectors, each mounted axially on one side of the flux conserver. The flux
and loop voltage in each helicity injector are varied sinusoidally and
in phase, while the two injectors are 90 degrees out of phase with each other,
producing a constant rate of power and helicity injection. Recent HIT-SI
device improvements include: modification of the external tank circuits
driving the injector loop voltages; a bakeout capability; improved conditioning
of the plasma-facing surfaces; and, installation of the HIT-II internal
magnetic probing array . These changes, coupled with various operational
improvements, have resulted in the production of up to 10 kA of axisymmetric
toroidal plasma current in the confinement region with only 3 MW of applied
power. The physical principles of SIHI and the HIT-SI device will be
presented, along with an introduction to the experimental, computational and
diagnostic developments described more fully in the other HIT-SI presentations
at this meeting.
 T.R.Jarboe, Fus. Tech., v.36, p.85 (1999).
 P.E.Sieck et al., IEEE Trans. Plasma Sci., v.33, p.723-728 (2005).
 A.J.Redd et al., IEE Japan Trans. Fundamentals and Materials, v.125,
Please place as the first HIT poster or talk, whichever is applicable.