T.E. Evans et al 2008 Nucl. Fusion 48 024002 doi:10.1088/0029-5515/48/2/024002
RMP ELM suppression in DIII-D plasmas with ITER similar shapes and collisionalities
T.E. Evans1, M.E. Fenstermacher2, R.A. Moyer3, T.H. Osborne1, J.G. Watkins4, P. Gohil1, I. Joseph3, M.J. Schaffer1, L.R. Baylor5, M. Bécoulet6, J.A. Boedo3, K.H. Burrell1, J.S. deGrassie1, K.H. Finken7, T. Jernigan5, M.W. Jakubowski8, C.J. Lasnier2, M. Lehnen7, A.W. Leonard1, J. Lonnroth9, E. Nardon6, V. Parail10, O. Schmitz7, B. Unterberg7 and W.P. West1
Show affiliationsLarge Type-I edge localized modes (ELMs) are completely eliminated with small n = 3 resonant magnetic perturbations (RMP) in low average triangularity, 
, plasmas and in ITER similar shaped (ISS) plasmas, 
, with ITER relevant collisionalities 
. Significant differences in the RMP requirements and in the properties of the ELM suppressed plasmas are found when comparing the two triangularities. In ISS plasmas, the current required to suppress ELMs is approximately 25% higher than in low average triangularity plasmas. It is also found that the width of the resonant q95 window required for ELM suppression is smaller in ISS plasmas than in low average triangularity plasmas. An analysis of the positions and widths of resonant magnetic islands across the pedestal region, in the absence of resonant field screening or a self-consistent plasma response, indicates that differences in the shape of the q profile may explain the need for higher RMP coil currents during ELM suppression in ISS plasmas. Changes in the pedestal profiles are compared for each plasma shape as well as with changes in the injected neutral beam power and the RMP amplitude. Implications of these results are discussed in terms of requirements for optimal ELM control coil designs and for establishing the physics basis needed in order to scale this approach to future burning plasma devices such as ITER.
- PACS
-
52.55.Fa Tokamaks, spherical tokamaks
52.55.Rk Power exhaust; divertors
- Subjects
- Dates
-
Issue 2 (February 2008)
Received 4 June 2007, accepted for publication 5 September 2007
Published 23 January 2008
-
RMP ELM suppression in DIII-D plasmas with ITER similar shapes and collisionalities
T.E. Evans et al 2008 Nucl. Fusion 48 024002
-
An Effective Three-Dimensional Micromagnetic Method and Its Application to Magnetic Tunnel Junctions
Liu Yao-Wen et al 2005 Chinese Phys. Lett. 22 1270
-
Magnetic turbulence in space plasmas: in and around the Earth's magnetosphere
Gaetano Zimbardo 2006 Plasma Phys. Control. Fusion 48 B295
-
Statistical properties of electrostatic turbulence in toroidal magnetized plasmas
B Labit et al 2007 Plasma Phys. Control. Fusion 49 B281
-
Edge turbulence measurements in toroidal fusion devices
S J Zweben et al 2007 Plasma Phys. Control. Fusion 49 S1
-
Channel formation in single-monolayer pentacene thin film transistors
B-N Park et al 2007 J. Phys. D: Appl. Phys. 40 3506
-
Cyclic cluster model for calculating defects in solids using the local density approximation
J Miró et al 1997 J. Phys.: Condens. Matter 9 9555
-
A molecular radical model for hydrogen and muonium in graphite
S F J Cox et al 2001 J. Phys.: Condens. Matter 13 2169
-
The di-interstitial in graphite
C D Latham et al 2008 J. Phys.: Condens. Matter 20 395220
-
Glide dislocations in diamond: first-principles calculations of similarities with and differences from silicon and the effects of hydrogen
M I Heggie et al 2002 J. Phys.: Condens. Matter 14 12689
Users also read
What's this?- Effects of 3D magnetic perturbations on toroidal plasmas
- Tearing mode structure in the DIII-D tokamak through spectrally filtered fast visible bremsstrahlung imaging
- A first-principles predictive model of the pedestal height and width: development, testing and ITER optimization with the EPED model
Related review articles
What's this?- Tokamak equilibria with nearly zero central current: the current hole
- The CRONOS suite of codes for integrated tokamak modelling
- Dust in magnetic fusion devices