Physics of confinement improvement of plasmas with impurity injection in DIII-D

M. Murakami; G. R. McKee; G. L. Jackson; G. M. Staebler; D. A. Alexander; D. R. Baker; G. Bateman; L. R. Baylor; J. A. Boedo; N. H. Brooks; K. H. Burrell; J. R. Cary; R. H. Cohen; R. J. Colchin; J. C. DeBoo; E. J. Doyle; D. R. Ernst; T. E. Evans; C. Fenzi; C. M. Greenfield; D. E. Greenwood; R. J. Groebner; J. T. Hogan; W. A. Houlberg; A. W. Hyatt; R. Jayakumar; T. C. Jernigan; R. A. Jong; J. E. Kinsey; A. H. Kritz; R. J. La Haye; L. L. Lao; C. J. Lasnier; M. A. Makowski; J. Mandrekas; A. M. Messiaen; R. A. Moyer; J. Ongena; A. Pankin; T. W. Petrie; C. C. Petty; C. L. Rettig; T. L. Rhodes; B. W. Rice; D. W. Ross; J. C. Rost; S. G. Shasharina; H. E. St. John; W. M. Stacey; P. I. Strand; R. D. Sydora; T. S. Taylor; D. M. Thomas; M. R. Wade; R. E. Waltz; W. P. West; K. L. Wong; L. Zeng

doi:10.1088/0029-5515/41/3/309

Physics of confinement improvement of plasmas with impurity injection in DIII-D

M. Murakami, G. R. McKee, G. L. Jackson, G. M. Staebler, D. A. Alexander, D. R. Baker, G. Bateman, L. R. Baylor, J. A. Boedo, N. H. Brooks, K. H. Burrell, J. R. Cary, R. H. Cohen, R. J. Colchin, J. C. DeBoo, E. J. Doyle, D. R. Ernst, T. E. Evans, C. Fenzi, C. M. GreenfieldD. E. Greenwood, R. J. Groebner, J. T. Hogan, W. A. Houlberg, A. W. Hyatt, R. Jayakumar, T. C. Jernigan, R. A. Jong, J. E. Kinsey, A. H. Kritz, R. J. La Haye, L. L. Lao, C. J. Lasnier, M. A. Makowski, J. Mandrekas, A. M. Messiaen, R. A. Moyer, J. Ongena, A. Pankin, T. W. Petrie, C. C. Petty, C. L. Rettig, T. L. Rhodes, B. W. Rice, D. W. Ross, J. C. Rost, S. G. Shasharina, H. E. St. John, W. M. Stacey, P. I. Strand, R. D. Sydora, T. S. Taylor, D. M. Thomas, M. R. Wade, R. E. Waltz, W. P. West, K. L. Wong, L. Zeng

Laboratory for Plasma Physics

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Abstract

External impurity injection into L mode edge discharges in DIII-D has produced clear confinement improvement (a factor of 2 in energy confinement and neutron emission), reduction in all transport channels (particularly ion thermal diffusivity to the neoclassical level), and simultaneous reduction of long wavelength turbulence. Suppression of the long wavelength turbulence and transport reduction are attributed to synergistic effects of impurity induced enhancement of E × B shearing rate and reduction of toroidal drift wave turbulence growth rate. A prompt reduction of density fluctuations and local transport at the beginning of impurity injection appears to result from an increased gradient of toroidal rotation enhancing the E × B shearing. Transport simulations carried out using the National Transport Code Collaboration demonstration code with a gyro-Landau fluid model, GLF23, indicate that E × B shearing suppression is the dominant transport suppression mechanism.

Original language	English
Pages (from-to)	317-323
Number of pages	7
Journal	Nuclear Fusion
Volume	41
Issue number	3
DOIs	https://doi.org/10.1088/0029-5515/41/3/309
Publication status	Published - Mar 2001

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Murakami, M., McKee, G. R., Jackson, G. L., Staebler, G. M., Alexander, D. A., Baker, D. R., Bateman, G., Baylor, L. R., Boedo, J. A., Brooks, N. H., Burrell, K. H., Cary, J. R., Cohen, R. H., Colchin, R. J., DeBoo, J. C., Doyle, E. J., Ernst, D. R., Evans, T. E., Fenzi, C., ... Zeng, L. (2001). Physics of confinement improvement of plasmas with impurity injection in DIII-D. Nuclear Fusion, 41(3), 317-323. https://doi.org/10.1088/0029-5515/41/3/309

@article{bd17b25898324e77870ed607cef0f9c9,

title = "Physics of confinement improvement of plasmas with impurity injection in DIII-D",

abstract = "External impurity injection into L mode edge discharges in DIII-D has produced clear confinement improvement (a factor of 2 in energy confinement and neutron emission), reduction in all transport channels (particularly ion thermal diffusivity to the neoclassical level), and simultaneous reduction of long wavelength turbulence. Suppression of the long wavelength turbulence and transport reduction are attributed to synergistic effects of impurity induced enhancement of E × B shearing rate and reduction of toroidal drift wave turbulence growth rate. A prompt reduction of density fluctuations and local transport at the beginning of impurity injection appears to result from an increased gradient of toroidal rotation enhancing the E × B shearing. Transport simulations carried out using the National Transport Code Collaboration demonstration code with a gyro-Landau fluid model, GLF23, indicate that E × B shearing suppression is the dominant transport suppression mechanism.",

author = "M. Murakami and McKee, {G. R.} and Jackson, {G. L.} and Staebler, {G. M.} and Alexander, {D. A.} and Baker, {D. R.} and G. Bateman and Baylor, {L. R.} and Boedo, {J. A.} and Brooks, {N. H.} and Burrell, {K. H.} and Cary, {J. R.} and Cohen, {R. H.} and Colchin, {R. J.} and DeBoo, {J. C.} and Doyle, {E. J.} and Ernst, {D. R.} and Evans, {T. E.} and C. Fenzi and Greenfield, {C. M.} and Greenwood, {D. E.} and Groebner, {R. J.} and Hogan, {J. T.} and Houlberg, {W. A.} and Hyatt, {A. W.} and R. Jayakumar and Jernigan, {T. C.} and Jong, {R. A.} and Kinsey, {J. E.} and Kritz, {A. H.} and {La Haye}, {R. J.} and Lao, {L. L.} and Lasnier, {C. J.} and Makowski, {M. A.} and J. Mandrekas and Messiaen, {A. M.} and Moyer, {R. A.} and J. Ongena and A. Pankin and Petrie, {T. W.} and Petty, {C. C.} and Rettig, {C. L.} and Rhodes, {T. L.} and Rice, {B. W.} and Ross, {D. W.} and Rost, {J. C.} and Shasharina, {S. G.} and {St. John}, {H. E.} and Stacey, {W. M.} and Strand, {P. I.} and Sydora, {R. D.} and Taylor, {T. S.} and Thomas, {D. M.} and Wade, {M. R.} and Waltz, {R. E.} and West, {W. P.} and Wong, {K. L.} and L. Zeng",

year = "2001",

month = mar,

doi = "10.1088/0029-5515/41/3/309",

language = "English",

volume = "41",

pages = "317--323",

journal = "Nuclear Fusion",

issn = "0029-5515",

number = "3",

}

Murakami, M, McKee, GR, Jackson, GL, Staebler, GM, Alexander, DA, Baker, DR, Bateman, G, Baylor, LR, Boedo, JA, Brooks, NH, Burrell, KH, Cary, JR, Cohen, RH, Colchin, RJ, DeBoo, JC, Doyle, EJ, Ernst, DR, Evans, TE, Fenzi, C, Greenfield, CM, Greenwood, DE, Groebner, RJ, Hogan, JT, Houlberg, WA, Hyatt, AW, Jayakumar, R, Jernigan, TC, Jong, RA, Kinsey, JE, Kritz, AH, La Haye, RJ, Lao, LL, Lasnier, CJ, Makowski, MA, Mandrekas, J, Messiaen, AM, Moyer, RA, Ongena, J, Pankin, A, Petrie, TW, Petty, CC, Rettig, CL, Rhodes, TL, Rice, BW, Ross, DW, Rost, JC, Shasharina, SG, St. John, HE, Stacey, WM, Strand, PI, Sydora, RD, Taylor, TS, Thomas, DM, Wade, MR, Waltz, RE, West, WP, Wong, KL & Zeng, L 2001, 'Physics of confinement improvement of plasmas with impurity injection in DIII-D', Nuclear Fusion, vol. 41, no. 3, pp. 317-323. https://doi.org/10.1088/0029-5515/41/3/309

TY - JOUR

T1 - Physics of confinement improvement of plasmas with impurity injection in DIII-D

AU - Murakami, M.

AU - McKee, G. R.

AU - Jackson, G. L.

AU - Staebler, G. M.

AU - Alexander, D. A.

AU - Baker, D. R.

AU - Bateman, G.

AU - Baylor, L. R.

AU - Boedo, J. A.

AU - Brooks, N. H.

AU - Burrell, K. H.

AU - Cary, J. R.

AU - Cohen, R. H.

AU - Colchin, R. J.

AU - DeBoo, J. C.

AU - Doyle, E. J.

AU - Ernst, D. R.

AU - Evans, T. E.

AU - Fenzi, C.

AU - Greenfield, C. M.

AU - Greenwood, D. E.

AU - Groebner, R. J.

AU - Hogan, J. T.

AU - Houlberg, W. A.

AU - Hyatt, A. W.

AU - Jayakumar, R.

AU - Jernigan, T. C.

AU - Jong, R. A.

AU - Kinsey, J. E.

AU - Kritz, A. H.

AU - La Haye, R. J.

AU - Lao, L. L.

AU - Lasnier, C. J.

AU - Makowski, M. A.

AU - Mandrekas, J.

AU - Messiaen, A. M.

AU - Moyer, R. A.

AU - Ongena, J.

AU - Pankin, A.

AU - Petrie, T. W.

AU - Petty, C. C.

AU - Rettig, C. L.

AU - Rhodes, T. L.

AU - Rice, B. W.

AU - Ross, D. W.

AU - Rost, J. C.

AU - Shasharina, S. G.

AU - St. John, H. E.

AU - Stacey, W. M.

AU - Strand, P. I.

AU - Sydora, R. D.

AU - Taylor, T. S.

AU - Thomas, D. M.

AU - Wade, M. R.

AU - Waltz, R. E.

AU - West, W. P.

AU - Wong, K. L.

AU - Zeng, L.

PY - 2001/3

Y1 - 2001/3

N2 - External impurity injection into L mode edge discharges in DIII-D has produced clear confinement improvement (a factor of 2 in energy confinement and neutron emission), reduction in all transport channels (particularly ion thermal diffusivity to the neoclassical level), and simultaneous reduction of long wavelength turbulence. Suppression of the long wavelength turbulence and transport reduction are attributed to synergistic effects of impurity induced enhancement of E × B shearing rate and reduction of toroidal drift wave turbulence growth rate. A prompt reduction of density fluctuations and local transport at the beginning of impurity injection appears to result from an increased gradient of toroidal rotation enhancing the E × B shearing. Transport simulations carried out using the National Transport Code Collaboration demonstration code with a gyro-Landau fluid model, GLF23, indicate that E × B shearing suppression is the dominant transport suppression mechanism.

AB - External impurity injection into L mode edge discharges in DIII-D has produced clear confinement improvement (a factor of 2 in energy confinement and neutron emission), reduction in all transport channels (particularly ion thermal diffusivity to the neoclassical level), and simultaneous reduction of long wavelength turbulence. Suppression of the long wavelength turbulence and transport reduction are attributed to synergistic effects of impurity induced enhancement of E × B shearing rate and reduction of toroidal drift wave turbulence growth rate. A prompt reduction of density fluctuations and local transport at the beginning of impurity injection appears to result from an increased gradient of toroidal rotation enhancing the E × B shearing. Transport simulations carried out using the National Transport Code Collaboration demonstration code with a gyro-Landau fluid model, GLF23, indicate that E × B shearing suppression is the dominant transport suppression mechanism.

UR - http://www.scopus.com/inward/record.url?scp=0035296929&partnerID=8YFLogxK

U2 - 10.1088/0029-5515/41/3/309

DO - 10.1088/0029-5515/41/3/309

M3 - Article

AN - SCOPUS:0035296929

SN - 0029-5515

VL - 41

SP - 317

EP - 323

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 3

ER -

Physics of confinement improvement of plasmas with impurity injection in DIII-D

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