Fast wave heating in the NSTX-Upgrade device

N. Bertelli; E. F. Jaeger; L. Berry; P. T. Bonoli; R. Budny; G. Y. Fu; S. Gerhardt; D. L. Green; R. W. Harvey; J. C. Hosea; G. J. Kramer; B. Leblanc; R. J. Perkins; C. K. Phillips; P. Ryan; G. Taylor; E. J. Valeo; J. R. Wilson; J. C. Wright

doi:10.1063/1.4864550

Fast wave heating in the NSTX-Upgrade device

N. Bertelli, E. F. Jaeger, L. Berry, P. T. Bonoli, R. Budny, G. Y. Fu, S. Gerhardt, D. L. Green, R. W. Harvey, J. C. Hosea, G. J. Kramer, B. Leblanc, R. J. Perkins, C. K. Phillips, P. Ryan, G. Taylor, E. J. Valeo, J. R. Wilson, J. C. Wright

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

15 Scopus citations

Abstract

NSTX-Upgrade will operate with toroidal magnetic fields (B_T) up to 1 T, nearly twice the value used in the experiments on NSTX, and the available NBI power will be doubled. The doubling of B_T while retaining the 30 MHz RF source frequency has moved the heating regime from the high harmonic fast wave (HHFW) regime used in NSTX to the mid harmonic fast wave (MHFW) regime. By making use of the full wave code AORSA, this work shows that direct ion damping (mainly by thermal ions localized at the 5th harmonic resonance) might be significant in NSTX-Upgrade under TRANSP predicted full performance conditions and the electron and ion absorption is sensitive to the ratio of electron and ion temperature. Launching at high toroidal wave number appears to be one way to significantly reduce the ion damping. By using the extended AORSA code, which includes a detailed description of the scrape-off layer in the field solutions, we found a large electric field amplitude outside of the last closed flux surface as previously seen in NSTX from AORSA simulations (D. L. Green, et al, Phys. Rev. Lett. 107, 145001 (2011)). Preliminary results by introducing a collision damping in the scrape-off layer in the AORSA code to represent a damping process are presented, showing for the first time absorbed power in the scrape-off layer.

Original language	English (US)
Title of host publication	Radiofrequency Power in Plasmas - Proceedings of the 20th Topical Conference
Publisher	American Institute of Physics Inc.
Pages	310-313
Number of pages	4
ISBN (Print)	9780735412101
DOIs	https://doi.org/10.1063/1.4864550
State	Published - 2014
Event	20th Topical Conference on Radiofrequency Power in Plasmas - Sorrento, Italy Duration: Jun 25 2013 → Jun 28 2013

Publication series

Name	AIP Conference Proceedings
Volume	1580
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Conference

Conference	20th Topical Conference on Radiofrequency Power in Plasmas
Country/Territory	Italy
City	Sorrento
Period	6/25/13 → 6/28/13

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

Access to Document

10.1063/1.4864550

Cite this

Bertelli, N., Jaeger, E. F., Berry, L., Bonoli, P. T., Budny, R., Fu, G. Y., Gerhardt, S., Green, D. L., Harvey, R. W., Hosea, J. C., Kramer, G. J., Leblanc, B., Perkins, R. J., Phillips, C. K., Ryan, P., Taylor, G., Valeo, E. J., Wilson, J. R., & Wright, J. C. (2014). Fast wave heating in the NSTX-Upgrade device. In Radiofrequency Power in Plasmas - Proceedings of the 20th Topical Conference (pp. 310-313). (AIP Conference Proceedings; Vol. 1580). American Institute of Physics Inc.. https://doi.org/10.1063/1.4864550

@inproceedings{0afe13b443984850bf6691abec265886,

title = "Fast wave heating in the NSTX-Upgrade device",

abstract = "NSTX-Upgrade will operate with toroidal magnetic fields (BT) up to 1 T, nearly twice the value used in the experiments on NSTX, and the available NBI power will be doubled. The doubling of BT while retaining the 30 MHz RF source frequency has moved the heating regime from the high harmonic fast wave (HHFW) regime used in NSTX to the mid harmonic fast wave (MHFW) regime. By making use of the full wave code AORSA, this work shows that direct ion damping (mainly by thermal ions localized at the 5th harmonic resonance) might be significant in NSTX-Upgrade under TRANSP predicted full performance conditions and the electron and ion absorption is sensitive to the ratio of electron and ion temperature. Launching at high toroidal wave number appears to be one way to significantly reduce the ion damping. By using the extended AORSA code, which includes a detailed description of the scrape-off layer in the field solutions, we found a large electric field amplitude outside of the last closed flux surface as previously seen in NSTX from AORSA simulations (D. L. Green, et al, Phys. Rev. Lett. 107, 145001 (2011)). Preliminary results by introducing a collision damping in the scrape-off layer in the AORSA code to represent a damping process are presented, showing for the first time absorbed power in the scrape-off layer.",

author = "N. Bertelli and Jaeger, \{E. F.\} and L. Berry and Bonoli, \{P. T.\} and R. Budny and Fu, \{G. Y.\} and S. Gerhardt and Green, \{D. L.\} and Harvey, \{R. W.\} and Hosea, \{J. C.\} and Kramer, \{G. J.\} and B. Leblanc and Perkins, \{R. J.\} and Phillips, \{C. K.\} and P. Ryan and G. Taylor and Valeo, \{E. J.\} and Wilson, \{J. R.\} and Wright, \{J. C.\}",

year = "2014",

doi = "10.1063/1.4864550",

language = "English (US)",

isbn = "9780735412101",

series = "AIP Conference Proceedings",

publisher = "American Institute of Physics Inc.",

pages = "310--313",

booktitle = "Radiofrequency Power in Plasmas - Proceedings of the 20th Topical Conference",

note = "20th Topical Conference on Radiofrequency Power in Plasmas ; Conference date: 25-06-2013 Through 28-06-2013",

}

Bertelli, N, Jaeger, EF, Berry, L, Bonoli, PT, Budny, R, Fu, GY, Gerhardt, S, Green, DL, Harvey, RW, Hosea, JC, Kramer, GJ , Leblanc, B, Perkins, RJ, Phillips, CK, Ryan, P, Taylor, G, Valeo, EJ, Wilson, JR & Wright, JC 2014, Fast wave heating in the NSTX-Upgrade device. in Radiofrequency Power in Plasmas - Proceedings of the 20th Topical Conference. AIP Conference Proceedings, vol. 1580, American Institute of Physics Inc., pp. 310-313, 20th Topical Conference on Radiofrequency Power in Plasmas, Sorrento, Italy, 6/25/13. https://doi.org/10.1063/1.4864550

TY - GEN

T1 - Fast wave heating in the NSTX-Upgrade device

AU - Bertelli, N.

AU - Jaeger, E. F.

AU - Berry, L.

AU - Bonoli, P. T.

AU - Budny, R.

AU - Fu, G. Y.

AU - Gerhardt, S.

AU - Green, D. L.

AU - Harvey, R. W.

AU - Hosea, J. C.

AU - Kramer, G. J.

AU - Leblanc, B.

AU - Perkins, R. J.

AU - Phillips, C. K.

AU - Ryan, P.

AU - Taylor, G.

AU - Valeo, E. J.

AU - Wilson, J. R.

AU - Wright, J. C.

PY - 2014

Y1 - 2014

N2 - NSTX-Upgrade will operate with toroidal magnetic fields (BT) up to 1 T, nearly twice the value used in the experiments on NSTX, and the available NBI power will be doubled. The doubling of BT while retaining the 30 MHz RF source frequency has moved the heating regime from the high harmonic fast wave (HHFW) regime used in NSTX to the mid harmonic fast wave (MHFW) regime. By making use of the full wave code AORSA, this work shows that direct ion damping (mainly by thermal ions localized at the 5th harmonic resonance) might be significant in NSTX-Upgrade under TRANSP predicted full performance conditions and the electron and ion absorption is sensitive to the ratio of electron and ion temperature. Launching at high toroidal wave number appears to be one way to significantly reduce the ion damping. By using the extended AORSA code, which includes a detailed description of the scrape-off layer in the field solutions, we found a large electric field amplitude outside of the last closed flux surface as previously seen in NSTX from AORSA simulations (D. L. Green, et al, Phys. Rev. Lett. 107, 145001 (2011)). Preliminary results by introducing a collision damping in the scrape-off layer in the AORSA code to represent a damping process are presented, showing for the first time absorbed power in the scrape-off layer.

AB - NSTX-Upgrade will operate with toroidal magnetic fields (BT) up to 1 T, nearly twice the value used in the experiments on NSTX, and the available NBI power will be doubled. The doubling of BT while retaining the 30 MHz RF source frequency has moved the heating regime from the high harmonic fast wave (HHFW) regime used in NSTX to the mid harmonic fast wave (MHFW) regime. By making use of the full wave code AORSA, this work shows that direct ion damping (mainly by thermal ions localized at the 5th harmonic resonance) might be significant in NSTX-Upgrade under TRANSP predicted full performance conditions and the electron and ion absorption is sensitive to the ratio of electron and ion temperature. Launching at high toroidal wave number appears to be one way to significantly reduce the ion damping. By using the extended AORSA code, which includes a detailed description of the scrape-off layer in the field solutions, we found a large electric field amplitude outside of the last closed flux surface as previously seen in NSTX from AORSA simulations (D. L. Green, et al, Phys. Rev. Lett. 107, 145001 (2011)). Preliminary results by introducing a collision damping in the scrape-off layer in the AORSA code to represent a damping process are presented, showing for the first time absorbed power in the scrape-off layer.

UR - https://www.scopus.com/pages/publications/84904957712

UR - https://www.scopus.com/inward/citedby.url?scp=84904957712&partnerID=8YFLogxK

U2 - 10.1063/1.4864550

DO - 10.1063/1.4864550

M3 - Conference contribution

AN - SCOPUS:84904957712

SN - 9780735412101

T3 - AIP Conference Proceedings

SP - 310

EP - 313

BT - Radiofrequency Power in Plasmas - Proceedings of the 20th Topical Conference

PB - American Institute of Physics Inc.

T2 - 20th Topical Conference on Radiofrequency Power in Plasmas

Y2 - 25 June 2013 through 28 June 2013

ER -

Fast wave heating in the NSTX-Upgrade device

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