ICRH current ramp discharges and alfven cascades in alcator C-mod

M. Porkolab; E. Edlund; J. Snipes; S. Wukitch; N. Basse; P. Bonoli; C. Boswell; C. Fiore; N. Gorelenkov; A. Hubbard; G. J. Kramer; L. Lin; Y. Lin; E. Marmar; G. Schilling

doi:10.1063/1.2098206

ICRH current ramp discharges and alfven cascades in alcator C-mod

M. Porkolab, E. Edlund, J. Snipes, S. Wukitch, N. Basse, P. Bonoli, C. Boswell, C. Fiore, N. Gorelenkov, A. Hubbard, G. J. Kramer, L. Lin, Y. Lin, E. Marmar, G. Schilling

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

Abstract

Current ramp experiments with intense ICRF power injected early in the ramp phase in Alcator C-Mod have been carried out. The goal of these experiments is to produce suitable reversed shear (RS) target plasmas for future Advanced Tokamak (AT) plasma research. Future plans call for off-axis injection of Lower Hybrid current drive (LHCD) to maintain the RS plasmas while increasing beta with additional ICRH. In the present experiments evidence of RS q-profiles has been demonstrated in the ramp stage of the discharge with the observation of Alfven-Cascades (or Reversed Shear Alfven-Eigenmodes or RSAE) driven by the energetic ICRF ion tail. The frequencies are in agreement with MHD code predictions. Evidence of sawtooth delay has also been observed by increasing the injected ICRF power.

Original language	English (US)
Title of host publication	RADIO FREQUENCY POWER IN PLASMAS
Subtitle of host publication	16th Topical Conference on Radio Frequency Power in Plasmas
Pages	114-117
Number of pages	4
DOIs	https://doi.org/10.1063/1.2098206
State	Published - Sep 26 2005
Event	RADIO FREQUENCY POWER IN PLASMAS: 16th Topical Conference on Radio Frequency Power in Plasmas - Park City, UT, United States Duration: Apr 11 2005 → Apr 13 2005

Publication series

Name	AIP Conference Proceedings
Volume	787
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Conference

Conference	RADIO FREQUENCY POWER IN PLASMAS: 16th Topical Conference on Radio Frequency Power in Plasmas
Country/Territory	United States
City	Park City, UT
Period	4/11/05 → 4/13/05

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

Access to Document

10.1063/1.2098206

Cite this

Porkolab, M., Edlund, E., Snipes, J., Wukitch, S., Basse, N., Bonoli, P., Boswell, C., Fiore, C., Gorelenkov, N., Hubbard, A., Kramer, G. J., Lin, L., Lin, Y., Marmar, E., & Schilling, G. (2005). ICRH current ramp discharges and alfven cascades in alcator C-mod. In RADIO FREQUENCY POWER IN PLASMAS: 16th Topical Conference on Radio Frequency Power in Plasmas (pp. 114-117). (AIP Conference Proceedings; Vol. 787). https://doi.org/10.1063/1.2098206

@inproceedings{e5bee35ea127474c8c49df0c21d6936d,

title = "ICRH current ramp discharges and alfven cascades in alcator C-mod",

abstract = "Current ramp experiments with intense ICRF power injected early in the ramp phase in Alcator C-Mod have been carried out. The goal of these experiments is to produce suitable reversed shear (RS) target plasmas for future Advanced Tokamak (AT) plasma research. Future plans call for off-axis injection of Lower Hybrid current drive (LHCD) to maintain the RS plasmas while increasing beta with additional ICRH. In the present experiments evidence of RS q-profiles has been demonstrated in the ramp stage of the discharge with the observation of Alfven-Cascades (or Reversed Shear Alfven-Eigenmodes or RSAE) driven by the energetic ICRF ion tail. The frequencies are in agreement with MHD code predictions. Evidence of sawtooth delay has also been observed by increasing the injected ICRF power.",

author = "M. Porkolab and E. Edlund and J. Snipes and S. Wukitch and N. Basse and P. Bonoli and C. Boswell and C. Fiore and N. Gorelenkov and A. Hubbard and Kramer, \{G. J.\} and L. Lin and Y. Lin and E. Marmar and G. Schilling",

year = "2005",

month = sep,

day = "26",

doi = "10.1063/1.2098206",

language = "English (US)",

isbn = "0735402760",

series = "AIP Conference Proceedings",

pages = "114--117",

booktitle = "RADIO FREQUENCY POWER IN PLASMAS",

note = "RADIO FREQUENCY POWER IN PLASMAS: 16th Topical Conference on Radio Frequency Power in Plasmas ; Conference date: 11-04-2005 Through 13-04-2005",

}

Porkolab, M, Edlund, E, Snipes, J, Wukitch, S, Basse, N, Bonoli, P, Boswell, C, Fiore, C, Gorelenkov, N, Hubbard, A, Kramer, GJ, Lin, L, Lin, Y, Marmar, E & Schilling, G 2005, ICRH current ramp discharges and alfven cascades in alcator C-mod. in RADIO FREQUENCY POWER IN PLASMAS: 16th Topical Conference on Radio Frequency Power in Plasmas. AIP Conference Proceedings, vol. 787, pp. 114-117, RADIO FREQUENCY POWER IN PLASMAS: 16th Topical Conference on Radio Frequency Power in Plasmas, Park City, UT, United States, 4/11/05. https://doi.org/10.1063/1.2098206

TY - GEN

T1 - ICRH current ramp discharges and alfven cascades in alcator C-mod

AU - Porkolab, M.

AU - Edlund, E.

AU - Snipes, J.

AU - Wukitch, S.

AU - Basse, N.

AU - Bonoli, P.

AU - Boswell, C.

AU - Fiore, C.

AU - Gorelenkov, N.

AU - Hubbard, A.

AU - Kramer, G. J.

AU - Lin, L.

AU - Lin, Y.

AU - Marmar, E.

AU - Schilling, G.

PY - 2005/9/26

Y1 - 2005/9/26

N2 - Current ramp experiments with intense ICRF power injected early in the ramp phase in Alcator C-Mod have been carried out. The goal of these experiments is to produce suitable reversed shear (RS) target plasmas for future Advanced Tokamak (AT) plasma research. Future plans call for off-axis injection of Lower Hybrid current drive (LHCD) to maintain the RS plasmas while increasing beta with additional ICRH. In the present experiments evidence of RS q-profiles has been demonstrated in the ramp stage of the discharge with the observation of Alfven-Cascades (or Reversed Shear Alfven-Eigenmodes or RSAE) driven by the energetic ICRF ion tail. The frequencies are in agreement with MHD code predictions. Evidence of sawtooth delay has also been observed by increasing the injected ICRF power.

AB - Current ramp experiments with intense ICRF power injected early in the ramp phase in Alcator C-Mod have been carried out. The goal of these experiments is to produce suitable reversed shear (RS) target plasmas for future Advanced Tokamak (AT) plasma research. Future plans call for off-axis injection of Lower Hybrid current drive (LHCD) to maintain the RS plasmas while increasing beta with additional ICRH. In the present experiments evidence of RS q-profiles has been demonstrated in the ramp stage of the discharge with the observation of Alfven-Cascades (or Reversed Shear Alfven-Eigenmodes or RSAE) driven by the energetic ICRF ion tail. The frequencies are in agreement with MHD code predictions. Evidence of sawtooth delay has also been observed by increasing the injected ICRF power.

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DO - 10.1063/1.2098206

M3 - Conference contribution

AN - SCOPUS:33749650949

SN - 0735402760

SN - 9780735402768

T3 - AIP Conference Proceedings

SP - 114

EP - 117

BT - RADIO FREQUENCY POWER IN PLASMAS

T2 - RADIO FREQUENCY POWER IN PLASMAS: 16th Topical Conference on Radio Frequency Power in Plasmas

Y2 - 11 April 2005 through 13 April 2005

ER -

ICRH current ramp discharges and alfven cascades in alcator C-mod

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