Complete suppression of the m = 2/n = 1 neoclassical tearing mode using electron cyclotron current drive in DIII-D

C. C. Petty; R. J. La Haye; T. C. Luce; D. A. Humphreys; A. W. Hyatt; J. Lohr; R. Prater; E. J. Strait; M. R. Wade

doi:10.1088/0029-5515/44/2/004

Complete suppression of the m = 2/n = 1 neoclassical tearing mode using electron cyclotron current drive in DIII-D

C. C. Petty, R. J. La Haye, T. C. Luce, D. A. Humphreys, A. W. Hyatt, J. Lohr, R. Prater, E. J. Strait, M. R. Wade

Fusion and Fission Energy and Science Di

Research output: Contribution to journal › Article › peer-review

160 Scopus citations

Abstract

The first suppression of the important and deleterious m = 2/n = 1 neoclassical tearing mode (NTM) is reported using electron cyclotron current drive (ECCD) to replace the 'missing' bootstrap current in the island O-point. Experiments on the DIII-D tokamak verify that the maximum shrinkage of the m = 2/n = 1 island occurs when the ECCD location coincides with the q = 2 surface. The DIII-D plasma control system is put into a 'search and suppress' mode to make small changes in the toroidal field to find and lock onto the optimum position, based on real time measurements of dB_θ/dt, for complete m = 2/n = 1 NTM suppression by ECCD. The requirements of the ECCD for complete island suppression are well modelled by the modified Rutherford equation for the DIII-D plasma conditions.

Original language	English
Pages (from-to)	243-251
Number of pages	9
Journal	Nuclear Fusion
Volume	44
Issue number	2
DOIs	https://doi.org/10.1088/0029-5515/44/2/004
State	Published - Feb 2004

Access to Document

10.1088/0029-5515/44/2/004

Cite this

@article{a17d07aacfb94055ae422bd973c6031d,

title = "Complete suppression of the m = 2/n = 1 neoclassical tearing mode using electron cyclotron current drive in DIII-D",

abstract = "The first suppression of the important and deleterious m = 2/n = 1 neoclassical tearing mode (NTM) is reported using electron cyclotron current drive (ECCD) to replace the 'missing' bootstrap current in the island O-point. Experiments on the DIII-D tokamak verify that the maximum shrinkage of the m = 2/n = 1 island occurs when the ECCD location coincides with the q = 2 surface. The DIII-D plasma control system is put into a 'search and suppress' mode to make small changes in the toroidal field to find and lock onto the optimum position, based on real time measurements of dBθ/dt, for complete m = 2/n = 1 NTM suppression by ECCD. The requirements of the ECCD for complete island suppression are well modelled by the modified Rutherford equation for the DIII-D plasma conditions.",

author = "Petty, {C. C.} and {La Haye}, {R. J.} and Luce, {T. C.} and Humphreys, {D. A.} and Hyatt, {A. W.} and J. Lohr and R. Prater and Strait, {E. J.} and Wade, {M. R.}",

year = "2004",

month = feb,

doi = "10.1088/0029-5515/44/2/004",

language = "English",

volume = "44",

pages = "243--251",

journal = "Nuclear Fusion",

issn = "0029-5515",

publisher = "IOP Publishing",

number = "2",

}

TY - JOUR

T1 - Complete suppression of the m = 2/n = 1 neoclassical tearing mode using electron cyclotron current drive in DIII-D

AU - Petty, C. C.

AU - La Haye, R. J.

AU - Luce, T. C.

AU - Humphreys, D. A.

AU - Hyatt, A. W.

AU - Lohr, J.

AU - Prater, R.

AU - Strait, E. J.

AU - Wade, M. R.

PY - 2004/2

Y1 - 2004/2

N2 - The first suppression of the important and deleterious m = 2/n = 1 neoclassical tearing mode (NTM) is reported using electron cyclotron current drive (ECCD) to replace the 'missing' bootstrap current in the island O-point. Experiments on the DIII-D tokamak verify that the maximum shrinkage of the m = 2/n = 1 island occurs when the ECCD location coincides with the q = 2 surface. The DIII-D plasma control system is put into a 'search and suppress' mode to make small changes in the toroidal field to find and lock onto the optimum position, based on real time measurements of dBθ/dt, for complete m = 2/n = 1 NTM suppression by ECCD. The requirements of the ECCD for complete island suppression are well modelled by the modified Rutherford equation for the DIII-D plasma conditions.

AB - The first suppression of the important and deleterious m = 2/n = 1 neoclassical tearing mode (NTM) is reported using electron cyclotron current drive (ECCD) to replace the 'missing' bootstrap current in the island O-point. Experiments on the DIII-D tokamak verify that the maximum shrinkage of the m = 2/n = 1 island occurs when the ECCD location coincides with the q = 2 surface. The DIII-D plasma control system is put into a 'search and suppress' mode to make small changes in the toroidal field to find and lock onto the optimum position, based on real time measurements of dBθ/dt, for complete m = 2/n = 1 NTM suppression by ECCD. The requirements of the ECCD for complete island suppression are well modelled by the modified Rutherford equation for the DIII-D plasma conditions.

UR - http://www.scopus.com/inward/record.url?scp=1542470840&partnerID=8YFLogxK

U2 - 10.1088/0029-5515/44/2/004

DO - 10.1088/0029-5515/44/2/004

M3 - Article

AN - SCOPUS:1542470840

SN - 0029-5515

VL - 44

SP - 243

EP - 251

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 2

ER -

Complete suppression of the m = 2/n = 1 neoclassical tearing mode using electron cyclotron current drive in DIII-D

Abstract

Access to Document

Other files and links

Fingerprint

Cite this