Observation of Persistent Edge Current Driven by Coaxial Helicity Injection (CHI)

Mueller, D. ; Nelson, B.A. ; Hamp, W.T. ; Redd, A.J. ; Jarboe, T.R. ; O' ; Neill, R.G. ; Smith, R.J.

Princeton University. Plasma Physics Laboratory.

关键词: Stability Spherical Torus;    Coaxial Helicity Injection;    70 Plasma Physics And Fusion Technology;    Non-Inductive Current Drive;    Helicity;   

DOI  :  10.2172/839171
RP-ID  :  PPPL-4065
RP-ID  :  AC02-76CH03073
RP-ID  :  839171

美国|英语

来源: UNT Digital Library

【 摘 要 】

Coaxial Helicity Injection, CHI, has been used on the National Spherical Torus Experiment (NSTX) [M. Ono et al., Nucl. Fusion 40 (2000) 557], the Helicity Injected Torus (HIT) [B.A. Nelson et al., Phys. Rev. Lett. 72 (1994) 3666] and HIT-II [T.R. Jarboe et al., Phys. Plasmas 5 (1998) 1807] to initiate plasma and to drive up to 400 kA of toroidal current. On HIT-II, CHI initiated discharges have been successfully coupled to ohmic sustainment [R. Raman et al., Phys. Plasmas 11 (2004) 2565]. This paper presents the first results on the use of CHI to demonstrate the persistence of edge current drive in a preestablished single-null diverted inductive discharge. Edge current drive has the potential to improve plasma stability limits [J.E. Menard et al., Nucl. Fusion 37 (1997) 595]. While most current drive methods drive current in the interior of the plasma, CHI is well suited for driving current in the edge plasma.