Efficient Generation of Closed Magnetic Flux Surfaces in a Large Spherical Tokamak Using Coaxial Helicity Injection

Journal Article · Fri Oct 27 00:00:00 EDT 2006 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.97.175002· OSTI ID:20861046

Raman, R; Nelson, B A; Jarboe, T R ^[1]; Bell, M G; Mueller, D; LeBlanc, B; Menard, J; Ono, M; Wilson, R ^[2]; Bigelow, T ^[3]; Maqueda, R ^[4]

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1. University of Washington, Seattle, Washington (United States)
2. Princeton Plasma Physics Laboratory, Princeton, New Jersey (United States)
3. Oak Ridge National Laboratory, Oak Ridge, Tennessee (United States)
4. Nova Photonics, Princeton, New Jersey (United States)

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 {approx}400 ms.

• OSTI ID: 20861046
• Journal Information: Physical Review Letters, Vol. 97, Issue 17; Other Information: DOI: 10.1103/PhysRevLett.97.175002; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAM INJECTION
HELICITY
MAGNETIC FLUX
MULTIPLICATION FACTORS
NSTX DEVICE
PLASMA
SOLENOIDS