ELM Suppression in Low Edge Collisionality H-Mode Discharges Using n=3 Magnetic Perturbations Page: 3 of 46
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ELM suppression in low edge collisionality H-mode discharges
using n=3 magnetic perturbations
K.H. Burrell,a) T.E. Evans,a) E.J. Doyleb) M.E. Fenstermacher, ) R.J. Groebner,a)
A.W. Leonard,a) R.A. Moyerd) T.H. Osborne,a) M.J. Schaffer,a) P.B. Snyder,a)
P.R. Thomas,') W.P. West, a) J.A. Boedo,d) A.M. Garofalo,D P. Gohil,a) G.L. Jacksona)
R.J. La Hayea) C.J. Lasnier,) H. Reimerdes,D T.L. Rhodesb) J.T. Scoville,a)
W.M. Solomon,g) D.M. Thomas,a) G. Wang,b) J.G. Watkinsh) and L. Zengb)
a)General Atomics, P.O. Box 85608, San Diego, CA 92186-9784
b)University of California, Los Angeles, California, USA
c)Lawrence Livermore National Laboratory, Livermore, California, USA
d)University of California, San Diego, California, USA
e)CEA Cadarache EURATOM Association, Cadarache, France
DColumbia University, New York, New York, USA
)Princeton Plasma Physics Laboratory, Princeton, New Jersey, USA
h)Sandia National Laboratories, Albuquerque, New Mexico, USA
Abstract. Using resonant magnetic perturbations with toroidal mode number n = 3, we
have produced H-mode discharges without edge localized modes (ELMs) which run with
constant density and radiated power for periods up to about 2550 ms (17 energy
confinement times). These ELM suppression results are achieved at pedestal
collisionalities close to those desired for next step burning plasma experiments such as
ITER and provide a means of eliminating the rapid erosion of divertor components in
such machines which could be caused by giant ELMs. The ELM suppression is due to an
enhancement in the edge particle transport which reduces the edge pressure gradient and
pedestal current density below the threshold for peeling-ballooning modes. These n = 3
magnetic perturbations provide a means of active control of edge plasma transport.
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Burrell, K H; Evans, T E; Doyle, E J; Fenstermacher, M E; Groebner, R J; Leonard, A W et al. ELM Suppression in Low Edge Collisionality H-Mode Discharges Using n=3 Magnetic Perturbations, article, July 11, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc902877/m1/3/: accessed December 11, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.