Suppression of m=2 islands by electron cyclotron heating in the Texas Experimental Tokamak: Experiment and theory

D. C. Sing; M. E. Austin; D. L. Brower; J. Y. Chen; R. F. Gandy; C. X. Yu; X. H. Wang; A. Bhattacharjee; D. D. Schnack

doi:10.1063/1.860659

Suppression of m=2 islands by electron cyclotron heating in the Texas Experimental Tokamak: Experiment and theory

D. C. Sing
, M. E. Austin
, D. L. Brower
, J. Y. Chen
, R. F. Gandy
, C. X. Yu
, X. H. Wang
, A. Bhattacharjee
, D. D. Schnack

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

17 Scopus citations

Abstract

Electron cyclotron heating (ECH) is used to suppress m = 2 magnetohydrodynamic (MHD) oscillations in the Texas Experimental Tokamak (TEXT) [Nucl. Technol. Fusion 1, 479 ( 1981 )]. The location of ECH power deposition is controlled by a movable antenna. The MHD activity is suppressed when the ECH beam is directed close to the q=2 surface. The experiment is simulated using a three-dimensional resistive MHD code in cylindrical geometry. For fixed plasma current, the saturated m = 2 island width is found to depend on the value of the safety factor at the magnetic axis (q₀). The simulation suggests that the observed saturated m=2 island in the pre-ECH plasma, which typically occupies 25% of the minor radius, corresponds to q₀∼ 1.3. The suppression of the island in the presence of ECH is attributed to current profile modification. In some discharges, the m = 2 activity does not resume even after the ECH pulse is turned off.

Original language	English (US)
Pages (from-to)	3239-3245
Number of pages	7
Journal	Physics of Fluids B
Volume	5
Issue number	9
DOIs	https://doi.org/10.1063/1.860659
State	Published - 1993
Externally published	Yes

All Science Journal Classification (ASJC) codes

Computational Mechanics
Condensed Matter Physics
Mechanics of Materials
General Physics and Astronomy
Fluid Flow and Transfer Processes

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10.1063/1.860659

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title = "Suppression of m=2 islands by electron cyclotron heating in the Texas Experimental Tokamak: Experiment and theory",

abstract = "Electron cyclotron heating (ECH) is used to suppress m = 2 magnetohydrodynamic (MHD) oscillations in the Texas Experimental Tokamak (TEXT) [Nucl. Technol. Fusion 1, 479 ( 1981 )]. The location of ECH power deposition is controlled by a movable antenna. The MHD activity is suppressed when the ECH beam is directed close to the q=2 surface. The experiment is simulated using a three-dimensional resistive MHD code in cylindrical geometry. For fixed plasma current, the saturated m = 2 island width is found to depend on the value of the safety factor at the magnetic axis (q0). The simulation suggests that the observed saturated m=2 island in the pre-ECH plasma, which typically occupies 25\% of the minor radius, corresponds to q0∼ 1.3. The suppression of the island in the presence of ECH is attributed to current profile modification. In some discharges, the m = 2 activity does not resume even after the ECH pulse is turned off.",

author = "Sing, \{D. C.\} and Austin, \{M. E.\} and Brower, \{D. L.\} and Chen, \{J. Y.\} and Gandy, \{R. F.\} and Yu, \{C. X.\} and Wang, \{X. H.\} and A. Bhattacharjee and Schnack, \{D. D.\}",

year = "1993",

doi = "10.1063/1.860659",

language = "English (US)",

volume = "5",

pages = "3239--3245",

journal = "Physics of Fluids B",

issn = "0899-8221",

publisher = "American Institute of Physics",

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TY - JOUR

T1 - Suppression of m=2 islands by electron cyclotron heating in the Texas Experimental Tokamak

T2 - Experiment and theory

AU - Sing, D. C.

AU - Austin, M. E.

AU - Brower, D. L.

AU - Chen, J. Y.

AU - Gandy, R. F.

AU - Yu, C. X.

AU - Wang, X. H.

AU - Bhattacharjee, A.

AU - Schnack, D. D.

PY - 1993

Y1 - 1993

N2 - Electron cyclotron heating (ECH) is used to suppress m = 2 magnetohydrodynamic (MHD) oscillations in the Texas Experimental Tokamak (TEXT) [Nucl. Technol. Fusion 1, 479 ( 1981 )]. The location of ECH power deposition is controlled by a movable antenna. The MHD activity is suppressed when the ECH beam is directed close to the q=2 surface. The experiment is simulated using a three-dimensional resistive MHD code in cylindrical geometry. For fixed plasma current, the saturated m = 2 island width is found to depend on the value of the safety factor at the magnetic axis (q0). The simulation suggests that the observed saturated m=2 island in the pre-ECH plasma, which typically occupies 25% of the minor radius, corresponds to q0∼ 1.3. The suppression of the island in the presence of ECH is attributed to current profile modification. In some discharges, the m = 2 activity does not resume even after the ECH pulse is turned off.

AB - Electron cyclotron heating (ECH) is used to suppress m = 2 magnetohydrodynamic (MHD) oscillations in the Texas Experimental Tokamak (TEXT) [Nucl. Technol. Fusion 1, 479 ( 1981 )]. The location of ECH power deposition is controlled by a movable antenna. The MHD activity is suppressed when the ECH beam is directed close to the q=2 surface. The experiment is simulated using a three-dimensional resistive MHD code in cylindrical geometry. For fixed plasma current, the saturated m = 2 island width is found to depend on the value of the safety factor at the magnetic axis (q0). The simulation suggests that the observed saturated m=2 island in the pre-ECH plasma, which typically occupies 25% of the minor radius, corresponds to q0∼ 1.3. The suppression of the island in the presence of ECH is attributed to current profile modification. In some discharges, the m = 2 activity does not resume even after the ECH pulse is turned off.

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SN - 0899-8221

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SP - 3239

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JO - Physics of Fluids B

JF - Physics of Fluids B

IS - 9

ER -

Suppression of m=2 islands by electron cyclotron heating in the Texas Experimental Tokamak: Experiment and theory

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