System studies of rf current drive for MST

J. K. Anderson; D. R. Burke; S. Diem; C. B. Forest; J. A. Goetz; R. W. Harvey; E. R. Hendries; M. C. Kaufman; A. H. Seltzman; M. A. Thomas

doi:10.1063/1.3665021

System studies of rf current drive for MST

J. K. Anderson, D. R. Burke, S. Diem, C. B. Forest, J. A. Goetz, R. W. Harvey, E. R. Hendries, M. C. Kaufman, A. H. Seltzman, M. A. Thomas

Fusion Technology

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

Two rf schemes are being studied on the MST reversed field pinch for their potential in current profile control experiments. MHD modeling has shown that a substantial externally-driven off axis parallel current can improve stability of the dominant core tearing modes. A radially localized axisymmetric population of fast electrons has been observed by SXR emission during LH injection ( 100kW at 800MHz), and is consistent with CQL3D modeling which predicts a small driven current. Computational work suggests that doubling the input power will statistically improve the LH-induced SXR signal to background ratio, and that about 2MW of injected power (an order of magnitude increase) will drive enough current for stabilization of tearing modes. Additionally, a 1 MW 5.5 GHz electron Bernstein wave (EBW) experiment is under construction, which utilizes a very simple and compact antenna compatible with the demands of the RFP. EBW allows access to electron cyclotron heating and current drive in the overdense plasma. Coupling of the external electromagnetic wave to the EBW has been demonstrated, and initial tests at ∼100kW power have produced a small, localized xray flux consistent with rf heating and high diffusivity of fast electrons. Computational work is currently underway to answer the very important questions of how much power is required, and what level of electron diffusivity is tolerable, to generate a consequential amount of EBW current.

Original language	English
Title of host publication	Radio Frequency Power in Plasmas - Proceedings of the 19th Topical Conference
Pages	489-492
Number of pages	4
DOIs	https://doi.org/10.1063/1.3665021
State	Published - 2011
Event	19th Topical Conference on Radio Frequency Power in Plasmas - Newport, RI, United States Duration: Jun 1 2011 → Jul 3 2011

Publication series

Name	AIP Conference Proceedings
Volume	1406
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Conference

Conference	19th Topical Conference on Radio Frequency Power in Plasmas
Country/Territory	United States
City	Newport, RI
Period	06/1/11 → 07/3/11

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10.1063/1.3665021

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Anderson, J. K., Burke, D. R., Diem, S., Forest, C. B., Goetz, J. A., Harvey, R. W., Hendries, E. R., Kaufman, M. C., Seltzman, A. H., & Thomas, M. A. (2011). System studies of rf current drive for MST. In Radio Frequency Power in Plasmas - Proceedings of the 19th Topical Conference (pp. 489-492). (AIP Conference Proceedings; Vol. 1406). https://doi.org/10.1063/1.3665021

@inproceedings{e38bf4c073d7427d98b0a181b219fd1f,

title = "System studies of rf current drive for MST",

abstract = "Two rf schemes are being studied on the MST reversed field pinch for their potential in current profile control experiments. MHD modeling has shown that a substantial externally-driven off axis parallel current can improve stability of the dominant core tearing modes. A radially localized axisymmetric population of fast electrons has been observed by SXR emission during LH injection ( 100kW at 800MHz), and is consistent with CQL3D modeling which predicts a small driven current. Computational work suggests that doubling the input power will statistically improve the LH-induced SXR signal to background ratio, and that about 2MW of injected power (an order of magnitude increase) will drive enough current for stabilization of tearing modes. Additionally, a 1 MW 5.5 GHz electron Bernstein wave (EBW) experiment is under construction, which utilizes a very simple and compact antenna compatible with the demands of the RFP. EBW allows access to electron cyclotron heating and current drive in the overdense plasma. Coupling of the external electromagnetic wave to the EBW has been demonstrated, and initial tests at ∼100kW power have produced a small, localized xray flux consistent with rf heating and high diffusivity of fast electrons. Computational work is currently underway to answer the very important questions of how much power is required, and what level of electron diffusivity is tolerable, to generate a consequential amount of EBW current.",

author = "Anderson, {J. K.} and Burke, {D. R.} and S. Diem and Forest, {C. B.} and Goetz, {J. A.} and Harvey, {R. W.} and Hendries, {E. R.} and Kaufman, {M. C.} and Seltzman, {A. H.} and Thomas, {M. A.}",

year = "2011",

doi = "10.1063/1.3665021",

language = "English",

isbn = "9780735409781",

series = "AIP Conference Proceedings",

pages = "489--492",

booktitle = "Radio Frequency Power in Plasmas - Proceedings of the 19th Topical Conference",

note = "19th Topical Conference on Radio Frequency Power in Plasmas ; Conference date: 01-06-2011 Through 03-07-2011",

}

Anderson, JK, Burke, DR, Diem, S, Forest, CB, Goetz, JA, Harvey, RW, Hendries, ER, Kaufman, MC, Seltzman, AH & Thomas, MA 2011, System studies of rf current drive for MST. in Radio Frequency Power in Plasmas - Proceedings of the 19th Topical Conference. AIP Conference Proceedings, vol. 1406, pp. 489-492, 19th Topical Conference on Radio Frequency Power in Plasmas, Newport, RI, United States, 06/1/11. https://doi.org/10.1063/1.3665021

TY - GEN

T1 - System studies of rf current drive for MST

AU - Anderson, J. K.

AU - Burke, D. R.

AU - Diem, S.

AU - Forest, C. B.

AU - Goetz, J. A.

AU - Harvey, R. W.

AU - Hendries, E. R.

AU - Kaufman, M. C.

AU - Seltzman, A. H.

AU - Thomas, M. A.

PY - 2011

Y1 - 2011

N2 - Two rf schemes are being studied on the MST reversed field pinch for their potential in current profile control experiments. MHD modeling has shown that a substantial externally-driven off axis parallel current can improve stability of the dominant core tearing modes. A radially localized axisymmetric population of fast electrons has been observed by SXR emission during LH injection ( 100kW at 800MHz), and is consistent with CQL3D modeling which predicts a small driven current. Computational work suggests that doubling the input power will statistically improve the LH-induced SXR signal to background ratio, and that about 2MW of injected power (an order of magnitude increase) will drive enough current for stabilization of tearing modes. Additionally, a 1 MW 5.5 GHz electron Bernstein wave (EBW) experiment is under construction, which utilizes a very simple and compact antenna compatible with the demands of the RFP. EBW allows access to electron cyclotron heating and current drive in the overdense plasma. Coupling of the external electromagnetic wave to the EBW has been demonstrated, and initial tests at ∼100kW power have produced a small, localized xray flux consistent with rf heating and high diffusivity of fast electrons. Computational work is currently underway to answer the very important questions of how much power is required, and what level of electron diffusivity is tolerable, to generate a consequential amount of EBW current.

AB - Two rf schemes are being studied on the MST reversed field pinch for their potential in current profile control experiments. MHD modeling has shown that a substantial externally-driven off axis parallel current can improve stability of the dominant core tearing modes. A radially localized axisymmetric population of fast electrons has been observed by SXR emission during LH injection ( 100kW at 800MHz), and is consistent with CQL3D modeling which predicts a small driven current. Computational work suggests that doubling the input power will statistically improve the LH-induced SXR signal to background ratio, and that about 2MW of injected power (an order of magnitude increase) will drive enough current for stabilization of tearing modes. Additionally, a 1 MW 5.5 GHz electron Bernstein wave (EBW) experiment is under construction, which utilizes a very simple and compact antenna compatible with the demands of the RFP. EBW allows access to electron cyclotron heating and current drive in the overdense plasma. Coupling of the external electromagnetic wave to the EBW has been demonstrated, and initial tests at ∼100kW power have produced a small, localized xray flux consistent with rf heating and high diffusivity of fast electrons. Computational work is currently underway to answer the very important questions of how much power is required, and what level of electron diffusivity is tolerable, to generate a consequential amount of EBW current.

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DO - 10.1063/1.3665021

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T3 - AIP Conference Proceedings

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EP - 492

BT - Radio Frequency Power in Plasmas - Proceedings of the 19th Topical Conference

T2 - 19th Topical Conference on Radio Frequency Power in Plasmas

Y2 - 1 June 2011 through 3 July 2011

ER -

System studies of rf current drive for MST

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