Spatiotemporal changes in the pressure-driven current densities on DIII-D due to magnetic islands

C. C. Petty; R. J. Jayakumar; M. A. Makowski; C. T. Holcomb; D. A. Humphreys; R. J. La Haye; T. C. Luce; P. A. Politzer; R. Prater; M. R. Wade; A. S. Welander

doi:10.1088/0029-5515/52/1/013011

Spatiotemporal changes in the pressure-driven current densities on DIII-D due to magnetic islands

C. C. Petty, R. J. Jayakumar, M. A. Makowski, C. T. Holcomb, D. A. Humphreys, R. J. La Haye, T. C. Luce, P. A. Politzer, R. Prater, M. R. Wade, A. S. Welander

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

6 Scopus citations

Abstract

Using direct analysis of the motional Stark effect (MSE) signals, an explicit measurement of the 'missing' bootstrap current density around the island location of a neoclassical tearing mode (NTM) is made for the first time. When the NTM is suppressed using co-electron cyclotron current drive, the measured changes in the current profile that restore the bootstrap current are also directly found from the MSE measurements. Additionally, direct analysis of helical perturbations in the MSE signals during slowly rotating 'quasi-stationary' modes shows the first explicit measurement of the deficit in the toroidal current density in the island O-point.

Original language	English
Article number	013011
Journal	Nuclear Fusion
Volume	52
Issue number	1
DOIs	https://doi.org/10.1088/0029-5515/52/1/013011
State	Published - Jan 2012
Externally published	Yes

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title = "Spatiotemporal changes in the pressure-driven current densities on DIII-D due to magnetic islands",

abstract = "Using direct analysis of the motional Stark effect (MSE) signals, an explicit measurement of the 'missing' bootstrap current density around the island location of a neoclassical tearing mode (NTM) is made for the first time. When the NTM is suppressed using co-electron cyclotron current drive, the measured changes in the current profile that restore the bootstrap current are also directly found from the MSE measurements. Additionally, direct analysis of helical perturbations in the MSE signals during slowly rotating 'quasi-stationary' modes shows the first explicit measurement of the deficit in the toroidal current density in the island O-point.",

author = "Petty, {C. C.} and Jayakumar, {R. J.} and Makowski, {M. A.} and Holcomb, {C. T.} and Humphreys, {D. A.} and {La Haye}, {R. J.} and Luce, {T. C.} and Politzer, {P. A.} and R. Prater and Wade, {M. R.} and Welander, {A. S.}",

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doi = "10.1088/0029-5515/52/1/013011",

language = "English",

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T1 - Spatiotemporal changes in the pressure-driven current densities on DIII-D due to magnetic islands

AU - Petty, C. C.

AU - Jayakumar, R. J.

AU - Makowski, M. A.

AU - Holcomb, C. T.

AU - Humphreys, D. A.

AU - La Haye, R. J.

AU - Luce, T. C.

AU - Politzer, P. A.

AU - Prater, R.

AU - Wade, M. R.

AU - Welander, A. S.

PY - 2012/1

Y1 - 2012/1

N2 - Using direct analysis of the motional Stark effect (MSE) signals, an explicit measurement of the 'missing' bootstrap current density around the island location of a neoclassical tearing mode (NTM) is made for the first time. When the NTM is suppressed using co-electron cyclotron current drive, the measured changes in the current profile that restore the bootstrap current are also directly found from the MSE measurements. Additionally, direct analysis of helical perturbations in the MSE signals during slowly rotating 'quasi-stationary' modes shows the first explicit measurement of the deficit in the toroidal current density in the island O-point.

AB - Using direct analysis of the motional Stark effect (MSE) signals, an explicit measurement of the 'missing' bootstrap current density around the island location of a neoclassical tearing mode (NTM) is made for the first time. When the NTM is suppressed using co-electron cyclotron current drive, the measured changes in the current profile that restore the bootstrap current are also directly found from the MSE measurements. Additionally, direct analysis of helical perturbations in the MSE signals during slowly rotating 'quasi-stationary' modes shows the first explicit measurement of the deficit in the toroidal current density in the island O-point.

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JO - Nuclear Fusion

JF - Nuclear Fusion

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ER -

Spatiotemporal changes in the pressure-driven current densities on DIII-D due to magnetic islands

Abstract

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