Correlations of heat and momentum transport in the TFTR tokamak

S. D. Scott; V. Arunasalam; C. W. Barnes; M. G. Bell; M. Bitter; R. Boivin; N. L. Bretz; R. Budny; C. E. Bush; A. Cavallo; T. K. Chu; Samuel A. Cohen; P. Colestock; S. L. Davis; D. L. Dimock; H. F. Dylla; P. C. Efthimion; A. B. Erhrardt; R. J. Fonck; E. Fredrickson; H. P. Furth; Robert James Goldston; G. Greene; B. Grek; L. R. Grisham; G. Hammett; R. J. Hawryluk; H. W. Hendel; K. W. Hill; E. Hinnov; D. J. Hoffman; J. Hosea; R. B. Howell; H. Hsuan; R. A. Hulse; K. P. Jaehnig; A. C. Janos; D. Jassby; F. Jobes; D. W. Johnson; R. Kaita; C. Kieras-Phillips; S. J. Kilpatrick; P. H. LaMarche; B. LeBlanc; R. Little; D. M. Manos; D. K. Mansfield; E. Mazzucato; M. P. McCarthy; D. C. McCune; K. McGuire; D. H. McNeill; D. M. Meade; S. S. Medley; D. R. Mikkelsen; R. Motley; D. Mueller; J. A. Murphy; Y. Nagayama; R. Nazakian; D. K. Owens; H. Park; A. T. Ramsey; M. H. Redi; A. L. Roquemore; P. H. Rutherford; G. Schilling; J. Schivell; G. L. Schmidt; J. Stevens; B. C. Stratton; W. Stodiek; E. J. Synakowski; W. M. Tang; G. Taylor; J. R. Timberlake; H. H. Towner; M. Ulrickson; S. Von Goeler; R. Wieland; M. Williams; J. R. Wilson; K. L. Wong; S. Yoshikawa; K. M. Young; M. C. Zarnstorff; S. J. Zweben

doi:10.1063/1.859545

Correlations of heat and momentum transport in the TFTR tokamak

S. D. Scott, V. Arunasalam, C. W. Barnes, M. G. Bell, M. Bitter, R. Boivin, N. L. Bretz, R. Budny, C. E. Bush, A. Cavallo, T. K. Chu, Samuel A. Cohen, P. Colestock, S. L. Davis, D. L. Dimock, H. F. Dylla, P. C. Efthimion, A. B. Erhrardt, R. J. Fonck, E. FredricksonH. P. Furth, Robert James Goldston, G. Greene, B. Grek, L. R. Grisham, G. Hammett, R. J. Hawryluk, H. W. Hendel, K. W. Hill, E. Hinnov, D. J. Hoffman, J. Hosea, R. B. Howell, H. Hsuan, R. A. Hulse, K. P. Jaehnig, A. C. Janos, D. Jassby, F. Jobes, D. W. Johnson, R. Kaita, C. Kieras-Phillips, S. J. Kilpatrick, P. H. LaMarche, B. LeBlanc, R. Little, D. M. Manos, D. K. Mansfield, E. Mazzucato, M. P. McCarthy, D. C. McCune, K. McGuire, D. H. McNeill, D. M. Meade, S. S. Medley, D. R. Mikkelsen, R. Motley, D. Mueller, J. A. Murphy, Y. Nagayama, R. Nazakian, D. K. Owens, H. Park, A. T. Ramsey, M. H. Redi, A. L. Roquemore, P. H. Rutherford, G. Schilling, J. Schivell, G. L. Schmidt, J. Stevens, B. C. Stratton, W. Stodiek, E. J. Synakowski, W. M. Tang, G. Taylor, J. R. Timberlake, H. H. Towner, M. Ulrickson, S. Von Goeler, R. Wieland, M. Williams, J. R. Wilson, K. L. Wong, S. Yoshikawa, K. M. Young, M. C. Zarnstorff, S. J. Zweben

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Abstract

Measurements of the toroidal rotation speed v_ø(r) driven by neutral beam injection in tokamak plasmas and, in particular, simultaneous profile measurements v_ø, T_i, T_e, and n_e, have provided new insights into the nature of anomalous transport in tokamaks. Low-recycling plasmas heated with unidirectional neutral beam injection exhibit a strong correlation among the local diffusivities, x _ø≈x_i>x_e. Recent measurements have confirmed similar behavior in broad-density L-mode plasmas. These results are consistent with the conjecture that electrostatic turbulence is the dominant transport mechanism in the tokamak fusion test reactor tokamak (TFTR) [Phys. Rev. Lett. 58, 1004 (1987)], and are inconsistent with predictions both from test-particle models of strong magnetic turbulence and from ripple transport. Toroidal rotation speed measurements in peaked-density TFTR " supershots" with partially unbalanced beam injection indicate that momentum transport decreases as the density profile becomes more peaked. In high-temperature, peaked-density plasmas the observed gradient scale length parameter n_i^tot = dlnT_i/dlnn_e correlates reasonably well with predictions of the threshold for exciting ion-temperature-gradient-driven turbulence (ITGDT), as would be expected for plasmas at marginal stability with respect to this strong transport mechanism. In L-mode plasmas where ITGDT is expected to be too weak to enforce marginal stability, n_i^tot exceeds this threshold considerably. However, preliminary experiments have failed to observe a significant increase in ion heat transport when n_i^tot was rapidly forced above n_c (the threshold for exciting ITGDT) using a perturbative particle source, as would have been expected for a plasma at marginal stability.

Original language	English (US)
Pages (from-to)	1300-1305
Number of pages	6
Journal	Physics of Fluids B
Volume	2
Issue number	6
DOIs	https://doi.org/10.1063/1.859545
State	Published - 1990

All Science Journal Classification (ASJC) codes

Computational Mechanics
Condensed Matter Physics
Mechanics of Materials
General Physics and Astronomy
Fluid Flow and Transfer Processes

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10.1063/1.859545

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Scott, S. D., Arunasalam, V., Barnes, C. W., Bell, M. G., Bitter, M., Boivin, R., Bretz, N. L., Budny, R., Bush, C. E., Cavallo, A., Chu, T. K., Cohen, S. A., Colestock, P., Davis, S. L., Dimock, D. L., Dylla, H. F., Efthimion, P. C., Erhrardt, A. B., Fonck, R. J., ... Zweben, S. J. (1990). Correlations of heat and momentum transport in the TFTR tokamak. Physics of Fluids B, 2(6), 1300-1305. https://doi.org/10.1063/1.859545

@article{2842929a524e464d8ab8f6f8d28a2d1e,

title = "Correlations of heat and momentum transport in the TFTR tokamak",

abstract = "Measurements of the toroidal rotation speed v{\o}(r) driven by neutral beam injection in tokamak plasmas and, in particular, simultaneous profile measurements v{\o}, Ti, Te, and ne, have provided new insights into the nature of anomalous transport in tokamaks. Low-recycling plasmas heated with unidirectional neutral beam injection exhibit a strong correlation among the local diffusivities, x {\o}≈xi>xe. Recent measurements have confirmed similar behavior in broad-density L-mode plasmas. These results are consistent with the conjecture that electrostatic turbulence is the dominant transport mechanism in the tokamak fusion test reactor tokamak (TFTR) [Phys. Rev. Lett. 58, 1004 (1987)], and are inconsistent with predictions both from test-particle models of strong magnetic turbulence and from ripple transport. Toroidal rotation speed measurements in peaked-density TFTR {"} supershots{"} with partially unbalanced beam injection indicate that momentum transport decreases as the density profile becomes more peaked. In high-temperature, peaked-density plasmas the observed gradient scale length parameter nitot = dlnTi/dlnne correlates reasonably well with predictions of the threshold for exciting ion-temperature-gradient-driven turbulence (ITGDT), as would be expected for plasmas at marginal stability with respect to this strong transport mechanism. In L-mode plasmas where ITGDT is expected to be too weak to enforce marginal stability, nitot exceeds this threshold considerably. However, preliminary experiments have failed to observe a significant increase in ion heat transport when nitot was rapidly forced above nc (the threshold for exciting ITGDT) using a perturbative particle source, as would have been expected for a plasma at marginal stability.",

author = "Scott, {S. D.} and V. Arunasalam and Barnes, {C. W.} and Bell, {M. G.} and M. Bitter and R. Boivin and Bretz, {N. L.} and R. Budny and Bush, {C. E.} and A. Cavallo and Chu, {T. K.} and Cohen, {Samuel A.} and P. Colestock and Davis, {S. L.} and Dimock, {D. L.} and Dylla, {H. F.} and Efthimion, {P. C.} and Erhrardt, {A. B.} and Fonck, {R. J.} and E. Fredrickson and Furth, {H. P.} and Goldston, {Robert James} and G. Greene and B. Grek and Grisham, {L. R.} and G. Hammett and Hawryluk, {R. J.} and Hendel, {H. W.} and Hill, {K. W.} and E. Hinnov and Hoffman, {D. J.} and J. Hosea and Howell, {R. B.} and H. Hsuan and Hulse, {R. A.} and Jaehnig, {K. P.} and Janos, {A. C.} and D. Jassby and F. Jobes and Johnson, {D. W.} and R. Kaita and C. Kieras-Phillips and Kilpatrick, {S. J.} and LaMarche, {P. H.} and B. LeBlanc and R. Little and Manos, {D. M.} and Mansfield, {D. K.} and E. Mazzucato and McCarthy, {M. P.} and McCune, {D. C.} and K. McGuire and McNeill, {D. H.} and Meade, {D. M.} and Medley, {S. S.} and Mikkelsen, {D. R.} and R. Motley and D. Mueller and Murphy, {J. A.} and Y. Nagayama and R. Nazakian and Owens, {D. K.} and H. Park and Ramsey, {A. T.} and Redi, {M. H.} and Roquemore, {A. L.} and Rutherford, {P. H.} and G. Schilling and J. Schivell and Schmidt, {G. L.} and J. Stevens and Stratton, {B. C.} and W. Stodiek and Synakowski, {E. J.} and Tang, {W. M.} and G. Taylor and Timberlake, {J. R.} and Towner, {H. H.} and M. Ulrickson and {Von Goeler}, S. and R. Wieland and M. Williams and Wilson, {J. R.} and Wong, {K. L.} and S. Yoshikawa and Young, {K. M.} and Zarnstorff, {M. C.} and Zweben, {S. J.}",

year = "1990",

doi = "10.1063/1.859545",

language = "English (US)",

volume = "2",

pages = "1300--1305",

journal = "Physics of Fluids B",

issn = "0899-8221",

publisher = "American Institute of Physics",

number = "6",

}

Scott, SD, Arunasalam, V, Barnes, CW, Bell, MG, Bitter, M, Boivin, R, Bretz, NL, Budny, R, Bush, CE, Cavallo, A, Chu, TK, Cohen, SA, Colestock, P, Davis, SL, Dimock, DL, Dylla, HF, Efthimion, PC, Erhrardt, AB, Fonck, RJ, Fredrickson, E, Furth, HP, Goldston, RJ, Greene, G, Grek, B, Grisham, LR, Hammett, G, Hawryluk, RJ, Hendel, HW, Hill, KW, Hinnov, E, Hoffman, DJ, Hosea, J, Howell, RB, Hsuan, H, Hulse, RA, Jaehnig, KP, Janos, AC, Jassby, D, Jobes, F, Johnson, DW, Kaita, R, Kieras-Phillips, C, Kilpatrick, SJ, LaMarche, PH, LeBlanc, B, Little, R, Manos, DM, Mansfield, DK, Mazzucato, E, McCarthy, MP, McCune, DC, McGuire, K, McNeill, DH, Meade, DM, Medley, SS, Mikkelsen, DR, Motley, R, Mueller, D, Murphy, JA, Nagayama, Y, Nazakian, R, Owens, DK, Park, H, Ramsey, AT, Redi, MH, Roquemore, AL, Rutherford, PH, Schilling, G, Schivell, J, Schmidt, GL, Stevens, J, Stratton, BC, Stodiek, W, Synakowski, EJ, Tang, WM, Taylor, G, Timberlake, JR, Towner, HH, Ulrickson, M, Von Goeler, S, Wieland, R, Williams, M, Wilson, JR, Wong, KL, Yoshikawa, S, Young, KM, Zarnstorff, MC & Zweben, SJ 1990, 'Correlations of heat and momentum transport in the TFTR tokamak', Physics of Fluids B, vol. 2, no. 6, pp. 1300-1305. https://doi.org/10.1063/1.859545

TY - JOUR

T1 - Correlations of heat and momentum transport in the TFTR tokamak

AU - Scott, S. D.

AU - Arunasalam, V.

AU - Barnes, C. W.

AU - Bell, M. G.

AU - Bitter, M.

AU - Boivin, R.

AU - Bretz, N. L.

AU - Budny, R.

AU - Bush, C. E.

AU - Cavallo, A.

AU - Chu, T. K.

AU - Cohen, Samuel A.

AU - Colestock, P.

AU - Davis, S. L.

AU - Dimock, D. L.

AU - Dylla, H. F.

AU - Efthimion, P. C.

AU - Erhrardt, A. B.

AU - Fonck, R. J.

AU - Fredrickson, E.

AU - Furth, H. P.

AU - Goldston, Robert James

AU - Greene, G.

AU - Grek, B.

AU - Grisham, L. R.

AU - Hammett, G.

AU - Hawryluk, R. J.

AU - Hendel, H. W.

AU - Hill, K. W.

AU - Hinnov, E.

AU - Hoffman, D. J.

AU - Hosea, J.

AU - Howell, R. B.

AU - Hsuan, H.

AU - Hulse, R. A.

AU - Jaehnig, K. P.

AU - Janos, A. C.

AU - Jassby, D.

AU - Jobes, F.

AU - Johnson, D. W.

AU - Kaita, R.

AU - Kieras-Phillips, C.

AU - Kilpatrick, S. J.

AU - LaMarche, P. H.

AU - LeBlanc, B.

AU - Little, R.

AU - Manos, D. M.

AU - Mansfield, D. K.

AU - Mazzucato, E.

AU - McCarthy, M. P.

AU - McCune, D. C.

AU - McGuire, K.

AU - McNeill, D. H.

AU - Meade, D. M.

AU - Medley, S. S.

AU - Mikkelsen, D. R.

AU - Motley, R.

AU - Mueller, D.

AU - Murphy, J. A.

AU - Nagayama, Y.

AU - Nazakian, R.

AU - Owens, D. K.

AU - Park, H.

AU - Ramsey, A. T.

AU - Redi, M. H.

AU - Roquemore, A. L.

AU - Rutherford, P. H.

AU - Schilling, G.

AU - Schivell, J.

AU - Schmidt, G. L.

AU - Stevens, J.

AU - Stratton, B. C.

AU - Stodiek, W.

AU - Synakowski, E. J.

AU - Tang, W. M.

AU - Taylor, G.

AU - Timberlake, J. R.

AU - Towner, H. H.

AU - Ulrickson, M.

AU - Von Goeler, S.

AU - Wieland, R.

AU - Williams, M.

AU - Wilson, J. R.

AU - Wong, K. L.

AU - Yoshikawa, S.

AU - Young, K. M.

AU - Zarnstorff, M. C.

AU - Zweben, S. J.

PY - 1990

Y1 - 1990

N2 - Measurements of the toroidal rotation speed vø(r) driven by neutral beam injection in tokamak plasmas and, in particular, simultaneous profile measurements vø, Ti, Te, and ne, have provided new insights into the nature of anomalous transport in tokamaks. Low-recycling plasmas heated with unidirectional neutral beam injection exhibit a strong correlation among the local diffusivities, x ø≈xi>xe. Recent measurements have confirmed similar behavior in broad-density L-mode plasmas. These results are consistent with the conjecture that electrostatic turbulence is the dominant transport mechanism in the tokamak fusion test reactor tokamak (TFTR) [Phys. Rev. Lett. 58, 1004 (1987)], and are inconsistent with predictions both from test-particle models of strong magnetic turbulence and from ripple transport. Toroidal rotation speed measurements in peaked-density TFTR " supershots" with partially unbalanced beam injection indicate that momentum transport decreases as the density profile becomes more peaked. In high-temperature, peaked-density plasmas the observed gradient scale length parameter nitot = dlnTi/dlnne correlates reasonably well with predictions of the threshold for exciting ion-temperature-gradient-driven turbulence (ITGDT), as would be expected for plasmas at marginal stability with respect to this strong transport mechanism. In L-mode plasmas where ITGDT is expected to be too weak to enforce marginal stability, nitot exceeds this threshold considerably. However, preliminary experiments have failed to observe a significant increase in ion heat transport when nitot was rapidly forced above nc (the threshold for exciting ITGDT) using a perturbative particle source, as would have been expected for a plasma at marginal stability.

AB - Measurements of the toroidal rotation speed vø(r) driven by neutral beam injection in tokamak plasmas and, in particular, simultaneous profile measurements vø, Ti, Te, and ne, have provided new insights into the nature of anomalous transport in tokamaks. Low-recycling plasmas heated with unidirectional neutral beam injection exhibit a strong correlation among the local diffusivities, x ø≈xi>xe. Recent measurements have confirmed similar behavior in broad-density L-mode plasmas. These results are consistent with the conjecture that electrostatic turbulence is the dominant transport mechanism in the tokamak fusion test reactor tokamak (TFTR) [Phys. Rev. Lett. 58, 1004 (1987)], and are inconsistent with predictions both from test-particle models of strong magnetic turbulence and from ripple transport. Toroidal rotation speed measurements in peaked-density TFTR " supershots" with partially unbalanced beam injection indicate that momentum transport decreases as the density profile becomes more peaked. In high-temperature, peaked-density plasmas the observed gradient scale length parameter nitot = dlnTi/dlnne correlates reasonably well with predictions of the threshold for exciting ion-temperature-gradient-driven turbulence (ITGDT), as would be expected for plasmas at marginal stability with respect to this strong transport mechanism. In L-mode plasmas where ITGDT is expected to be too weak to enforce marginal stability, nitot exceeds this threshold considerably. However, preliminary experiments have failed to observe a significant increase in ion heat transport when nitot was rapidly forced above nc (the threshold for exciting ITGDT) using a perturbative particle source, as would have been expected for a plasma at marginal stability.

UR - http://www.scopus.com/inward/record.url?scp=0040664012&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0040664012&partnerID=8YFLogxK

U2 - 10.1063/1.859545

DO - 10.1063/1.859545

M3 - Article

AN - SCOPUS:0040664012

SN - 0899-8221

VL - 2

SP - 1300

EP - 1305

JO - Physics of Fluids B

JF - Physics of Fluids B

IS - 6

ER -

Correlations of heat and momentum transport in the TFTR tokamak

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