Mode conversion electron heating in Alcator C-Mod: Theory and experiment

P. T. Bonoli; M. Brambilla; E. Nelson-Melby; C. K. Phillips; M. Porkolab; G. Schilling; G. Taylor; S. J. Wukitch; R. L. Boivin; C. J. Boswell; C. L. Fiore; S. Gangadhara; J. Goetz; R. Granetz; M. Greenwald; A. E. Hubbard; I. H. Hutchinson; Y. In; J. Irby; B. LaBombard; B. Lipschultz; E. Marmar; A. Mazurenko; R. Nachtrieb; D. Pappas; C. S. Pitcher; J. Reardon; J. Rice; W. L. Rowan; J. A. Snipes; Y. Takase; J. Terry; S. M. Wolfe

doi:10.1063/1.874012

Mode conversion electron heating in Alcator C-Mod: Theory and experiment

P. T. Bonoli
, M. Brambilla
, E. Nelson-Melby
, C. K. Phillips
, M. Porkolab
, G. Schilling
, G. Taylor
, S. J. Wukitch
, R. L. Boivin
, C. J. Boswell
, C. L. Fiore
, S. Gangadhara
, J. Goetz
, R. Granetz
, M. Greenwald
, A. E. Hubbard
, I. H. Hutchinson
, Y. In
, J. Irby
, B. LaBombard

B. Lipschultz, E. Marmar, A. Mazurenko, R. Nachtrieb, D. Pappas, C. S. Pitcher, J. Reardon, J. Rice, W. L. Rowan, J. A. Snipes, Y. Takase, J. Terry, S. M. Wolfe

Research output: Contribution to journal › Conference article › peer-review

29 Scopus citations

Abstract

Localized electron heating [full width at half maximum of Δ(r/a)≈0.2] by mode converted ion Bernstein waves (IBW) has been observed in the Alcator C-Mod tokamak [I. H. Hutchinson et al., Phys. Plasmas 1, 1511 (1994)]. These experiments were performed in D(³He) plasmas at high magnetic field (B₀ = 7.9 T), high-plasma density (n_e0 ≥ 1.5×10²⁰ m^-3), and for 0.05≤n_Hc-3/n_e ≤0.30. Electron heating profiles of the mode converted IBW were measured using a break in slope analysis of the electron temperature versus time in the presence of rf (radio frequency) modulation. The peak position of electron heating was found to be well-correlated with ³He concentration, in agreement with the predictions of cold plasma theory. Recently, a toroidal full-wave ion cyclotron range of frequencies (ICRF) code TORIC [M. Brambilla, Nucl. Fusion 38, 1805 (1998)] was modified to include the effects of IBW electron Landau damping at (k_⊥ρ_t)²≫1, This model was used in combination with a 1D (one-dimensional) integral wave equation code METS [D. N. Smithe et al., Radio Frequency Power in Plasmas, AIP Conf. Proc. 403 (1997), p. 367] to analyze these experiments. Model predictions were found to be in qualitative and in some instances quantitative agreement with experimental measurements. A model for mode conversion current drive (MCCD) has also been developed which combines a toroidal full wave code with an adjoint evaluation of the ICRF current drive efficiency. Predictions for off-axis MCCD in C-Mod have been made using this model and will be described.

Original language	English (US)
Pages (from-to)	1886-1893
Number of pages	8
Journal	Physics of Plasmas
Volume	7
Issue number	5 II
DOIs	https://doi.org/10.1063/1.874012
State	Published - May 2000
Externally published	Yes
Event	41st Annual Meeting of the Division of Plasma Physics of the Ameircan Physical Society - Seattle, WA, United States Duration: Nov 15 1999 → Nov 19 1999

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1063/1.874012

Cite this

Bonoli, P. T., Brambilla, M., Nelson-Melby, E., Phillips, C. K., Porkolab, M., Schilling, G., Taylor, G., Wukitch, S. J., Boivin, R. L., Boswell, C. J., Fiore, C. L., Gangadhara, S., Goetz, J., Granetz, R., Greenwald, M., Hubbard, A. E., Hutchinson, I. H., In, Y., Irby, J., ... Wolfe, S. M. (2000). Mode conversion electron heating in Alcator C-Mod: Theory and experiment. Physics of Plasmas, 7(5 II), 1886-1893. https://doi.org/10.1063/1.874012

@article{8ab39d50313247d0836645e1a32a2345,

title = "Mode conversion electron heating in Alcator C-Mod: Theory and experiment",

abstract = "Localized electron heating [full width at half maximum of Δ(r/a)≈0.2] by mode converted ion Bernstein waves (IBW) has been observed in the Alcator C-Mod tokamak [I. H. Hutchinson et al., Phys. Plasmas 1, 1511 (1994)]. These experiments were performed in D(3He) plasmas at high magnetic field (B0 = 7.9 T), high-plasma density (ne0 ≥ 1.5{\texttimes}1020 m-3), and for 0.05≤nHc-3/ne ≤0.30. Electron heating profiles of the mode converted IBW were measured using a break in slope analysis of the electron temperature versus time in the presence of rf (radio frequency) modulation. The peak position of electron heating was found to be well-correlated with 3He concentration, in agreement with the predictions of cold plasma theory. Recently, a toroidal full-wave ion cyclotron range of frequencies (ICRF) code TORIC [M. Brambilla, Nucl. Fusion 38, 1805 (1998)] was modified to include the effects of IBW electron Landau damping at (k⊥ρt)2≫1, This model was used in combination with a 1D (one-dimensional) integral wave equation code METS [D. N. Smithe et al., Radio Frequency Power in Plasmas, AIP Conf. Proc. 403 (1997), p. 367] to analyze these experiments. Model predictions were found to be in qualitative and in some instances quantitative agreement with experimental measurements. A model for mode conversion current drive (MCCD) has also been developed which combines a toroidal full wave code with an adjoint evaluation of the ICRF current drive efficiency. Predictions for off-axis MCCD in C-Mod have been made using this model and will be described.",

author = "Bonoli, \{P. T.\} and M. Brambilla and E. Nelson-Melby and Phillips, \{C. K.\} and M. Porkolab and G. Schilling and G. Taylor and Wukitch, \{S. J.\} and Boivin, \{R. L.\} and Boswell, \{C. J.\} and Fiore, \{C. L.\} and S. Gangadhara and J. Goetz and R. Granetz and M. Greenwald and Hubbard, \{A. E.\} and Hutchinson, \{I. H.\} and Y. In and J. Irby and B. LaBombard and B. Lipschultz and E. Marmar and A. Mazurenko and R. Nachtrieb and D. Pappas and Pitcher, \{C. S.\} and J. Reardon and J. Rice and Rowan, \{W. L.\} and Snipes, \{J. A.\} and Y. Takase and J. Terry and Wolfe, \{S. M.\}",

year = "2000",

month = may,

doi = "10.1063/1.874012",

language = "English (US)",

volume = "7",

pages = "1886--1893",

journal = "Physics of Plasmas",

issn = "1070-664X",

publisher = "American Institute of Physics",

number = "5 II",

note = "41st Annual Meeting of the Division of Plasma Physics of the Ameircan Physical Society ; Conference date: 15-11-1999 Through 19-11-1999",

}

Bonoli, PT, Brambilla, M, Nelson-Melby, E, Phillips, CK, Porkolab, M, Schilling, G, Taylor, G, Wukitch, SJ, Boivin, RL, Boswell, CJ, Fiore, CL, Gangadhara, S, Goetz, J, Granetz, R, Greenwald, M, Hubbard, AE, Hutchinson, IH, In, Y, Irby, J, LaBombard, B, Lipschultz, B, Marmar, E, Mazurenko, A, Nachtrieb, R, Pappas, D, Pitcher, CS, Reardon, J, Rice, J, Rowan, WL, Snipes, JA, Takase, Y, Terry, J & Wolfe, SM 2000, 'Mode conversion electron heating in Alcator C-Mod: Theory and experiment', Physics of Plasmas, vol. 7, no. 5 II, pp. 1886-1893. https://doi.org/10.1063/1.874012

TY - JOUR

T1 - Mode conversion electron heating in Alcator C-Mod

T2 - 41st Annual Meeting of the Division of Plasma Physics of the Ameircan Physical Society

AU - Bonoli, P. T.

AU - Brambilla, M.

AU - Nelson-Melby, E.

AU - Phillips, C. K.

AU - Porkolab, M.

AU - Schilling, G.

AU - Taylor, G.

AU - Wukitch, S. J.

AU - Boivin, R. L.

AU - Boswell, C. J.

AU - Fiore, C. L.

AU - Gangadhara, S.

AU - Goetz, J.

AU - Granetz, R.

AU - Greenwald, M.

AU - Hubbard, A. E.

AU - Hutchinson, I. H.

AU - In, Y.

AU - Irby, J.

AU - LaBombard, B.

AU - Lipschultz, B.

AU - Marmar, E.

AU - Mazurenko, A.

AU - Nachtrieb, R.

AU - Pappas, D.

AU - Pitcher, C. S.

AU - Reardon, J.

AU - Rice, J.

AU - Rowan, W. L.

AU - Snipes, J. A.

AU - Takase, Y.

AU - Terry, J.

AU - Wolfe, S. M.

PY - 2000/5

Y1 - 2000/5

N2 - Localized electron heating [full width at half maximum of Δ(r/a)≈0.2] by mode converted ion Bernstein waves (IBW) has been observed in the Alcator C-Mod tokamak [I. H. Hutchinson et al., Phys. Plasmas 1, 1511 (1994)]. These experiments were performed in D(3He) plasmas at high magnetic field (B0 = 7.9 T), high-plasma density (ne0 ≥ 1.5×1020 m-3), and for 0.05≤nHc-3/ne ≤0.30. Electron heating profiles of the mode converted IBW were measured using a break in slope analysis of the electron temperature versus time in the presence of rf (radio frequency) modulation. The peak position of electron heating was found to be well-correlated with 3He concentration, in agreement with the predictions of cold plasma theory. Recently, a toroidal full-wave ion cyclotron range of frequencies (ICRF) code TORIC [M. Brambilla, Nucl. Fusion 38, 1805 (1998)] was modified to include the effects of IBW electron Landau damping at (k⊥ρt)2≫1, This model was used in combination with a 1D (one-dimensional) integral wave equation code METS [D. N. Smithe et al., Radio Frequency Power in Plasmas, AIP Conf. Proc. 403 (1997), p. 367] to analyze these experiments. Model predictions were found to be in qualitative and in some instances quantitative agreement with experimental measurements. A model for mode conversion current drive (MCCD) has also been developed which combines a toroidal full wave code with an adjoint evaluation of the ICRF current drive efficiency. Predictions for off-axis MCCD in C-Mod have been made using this model and will be described.

AB - Localized electron heating [full width at half maximum of Δ(r/a)≈0.2] by mode converted ion Bernstein waves (IBW) has been observed in the Alcator C-Mod tokamak [I. H. Hutchinson et al., Phys. Plasmas 1, 1511 (1994)]. These experiments were performed in D(3He) plasmas at high magnetic field (B0 = 7.9 T), high-plasma density (ne0 ≥ 1.5×1020 m-3), and for 0.05≤nHc-3/ne ≤0.30. Electron heating profiles of the mode converted IBW were measured using a break in slope analysis of the electron temperature versus time in the presence of rf (radio frequency) modulation. The peak position of electron heating was found to be well-correlated with 3He concentration, in agreement with the predictions of cold plasma theory. Recently, a toroidal full-wave ion cyclotron range of frequencies (ICRF) code TORIC [M. Brambilla, Nucl. Fusion 38, 1805 (1998)] was modified to include the effects of IBW electron Landau damping at (k⊥ρt)2≫1, This model was used in combination with a 1D (one-dimensional) integral wave equation code METS [D. N. Smithe et al., Radio Frequency Power in Plasmas, AIP Conf. Proc. 403 (1997), p. 367] to analyze these experiments. Model predictions were found to be in qualitative and in some instances quantitative agreement with experimental measurements. A model for mode conversion current drive (MCCD) has also been developed which combines a toroidal full wave code with an adjoint evaluation of the ICRF current drive efficiency. Predictions for off-axis MCCD in C-Mod have been made using this model and will be described.

UR - https://www.scopus.com/pages/publications/0006829772

UR - https://www.scopus.com/pages/publications/0006829772#tab=citedBy

U2 - 10.1063/1.874012

DO - 10.1063/1.874012

M3 - Conference article

AN - SCOPUS:0006829772

SN - 1070-664X

VL - 7

SP - 1886

EP - 1893

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 5 II

Y2 - 15 November 1999 through 19 November 1999

ER -

Mode conversion electron heating in Alcator C-Mod: Theory and experiment

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