R.J. Colchin et al 2002 Nucl. Fusion 42 1134 doi:10.1088/0029-5515/42/9/312
R.J. Colchin1, B.A. Carreras1, R. Maingi1, L.R. Baylor1, T.C. Jernigan1, M.J. Schaffer2, T.N. Carlstrom2, N.H. Brooks2, C.M. Greenfield2, P. Gohil2, G.R. McKee3, D.L. Rudakov4, T.L. Rhodes5, E.J. Doyle5, M.E. Austin6 and J.G. Watkins7
Show affiliationsDetails of the low-high (L-H) confinement transition are studied by a new technique which allows for an arbitrarily slow transition between the L- and H-modes on DIII-D. During the transition, the plasma is in an intermediate state (IM-mode) of temperature, density, confinement and edge shear flow. The IM-mode is characterized by periodic bursts of an edge instability, governed by relaxation oscillations, which evolve into type III edge localized modes (ELMs) as the neutral beam heating power is raised. An ELM-free H-mode is achieved when the edge pressure gradient is large enough to support shear flow sufficient to quell the IM-mode edge instability.
52.55.Fa Tokamaks, spherical tokamaks
Issue 9 (September 2002)
Received 11 February 2002, accepted for publication 24 May 2002
Published 13 August 2002
R.J. Colchin et al 2002 Nucl. Fusion 42 1134
Leonidas G Bleris et al 2006 J. Micromech. Microeng. 16 1792
Takahito Ono et al 2005 J. Micromech. Microeng. 15 1
Byung Il Lee et al 2006 Phys. Med. Biol. 51 443
Richard Dewhurst 2000 Meas. Sci. Technol. 11
J Steketee 1973 Phys. Med. Biol. 18 686
Josep Solà et al 2009 Physiol. Meas. 30 603
A Mahmood et al 1994 Distrib. Syst. Engng. 1 354
Patrick Mayor et al 2005 New J. Phys. 7 28
1996 Meas. Sci. Technol. 7