Efficient generation of closed magnetic flux surfaces in a large spherical tokamak using coaxial helicity injection.
A method of coaxial helicity injection has successfully produced a closed flux current without the use of the central solenoid in the NSTX device, on a size scale closer to a spherical torus reactor, for a proof-of-principle demonstration of this concept. For the first time, a remarkable 60 times current multiplication factor was achieved. Grad-Shafranov plasma equilibrium reconstructions are used to verify the existence of closed flux current. In some discharges the generated current persists for a surprisingly long time approximately 400 ms.
Raman
R
R
University of Washington, Seattle, Washington, USA.
Nelson
B A
BA
Bell
M G
MG
Jarboe
T R
TR
Mueller
D
D
Bigelow
T
T
Leblanc
B
B
Maqueda
R
R
Menard
J
J
Ono
M
M
Wilson
R
R