Recent results from the ATF torsatron

M. Murakami; S. C. Aceto; E. Anabitarte; D. T. Anderson; F. S.B. Anderson; D. B. Batchelor; B. Brañas; L. R. Baylor; G. L. Bell; J. D. Bell; T. S. Bigelow; B. A. Carreras; R. J. Colchin; N. A. Crocker; E. C. Crume; N. Dominguez; R. A. Dory; J. L. Dunlap; G. R. Dyer; A. C. England; R. H. Fowler; R. F. Gandy; J. C. Glowienka; R. C. Goldfinger; R. H. Goulding; G. R. Hanson; J. H. Harris; C. Hidalgo; D. L. Hillis; S. Hiroe; S. P. Hirshman; L. D. Horton; H. C. Howe; D. P. Hutchinson; R. C. Isler; T. C. Jernigan; H. Kaneko; M. Kwon; R. A. Langley; J. N. Leboeuf; D. K. Lee; D. H.C. Lo; V. E. Lynch; J. F. Lyon; C. H. Ma; M. M. Menon; P. K. Mioduszewski; S. Morita; R. N. Morris; G. H. Neilson; M. A. Ochando; S. Okamura; S. Paul; A. L. Qualls; D. A. Rasmussen; R. K. Richards; Ch P. Ritz; J. A. Rome; J. Sanchez; J. G. Schwelberger; K. C. Shaing; T. D. Shepard; J. E. Simpkins; C. E. Thomas; J. S. Tolliver; T. Uckan; K. L. Vander Sluis; M. R. Wade; J. B. Wilgen; W. R. Wing; H. Yamada; J. J. Zielinski

doi:10.1063/1.859645

Recent results from the ATF torsatron

M. Murakami, S. C. Aceto, E. Anabitarte, D. T. Anderson, F. S.B. Anderson, D. B. Batchelor, B. Brañas, L. R. Baylor, G. L. Bell, J. D. Bell, T. S. Bigelow, B. A. Carreras, R. J. Colchin, N. A. Crocker, E. C. Crume, N. Dominguez, R. A. Dory, J. L. Dunlap, G. R. Dyer, A. C. EnglandR. H. Fowler, R. F. Gandy, J. C. Glowienka, R. C. Goldfinger, R. H. Goulding, G. R. Hanson, J. H. Harris, C. Hidalgo, D. L. Hillis, S. Hiroe, S. P. Hirshman, L. D. Horton, H. C. Howe, D. P. Hutchinson, R. C. Isler, T. C. Jernigan, H. Kaneko, M. Kwon, R. A. Langley, J. N. Leboeuf, D. K. Lee, D. H.C. Lo, V. E. Lynch, J. F. Lyon, C. H. Ma, M. M. Menon, P. K. Mioduszewski, S. Morita, R. N. Morris, G. H. Neilson, M. A. Ochando, S. Okamura, S. Paul, A. L. Qualls, D. A. Rasmussen, R. K. Richards, Ch P. Ritz, J. A. Rome, J. Sanchez, J. G. Schwelberger, K. C. Shaing, T. D. Shepard, J. E. Simpkins, C. E. Thomas, J. S. Tolliver, T. Uckan, K. L. Vander Sluis, M. R. Wade, J. B. Wilgen, W. R. Wing, H. Yamada, J. J. Zielinski

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Abstract

Recent experiments in the Advanced Toroidal Facility (ATF) torsatron [Plasma Physics and Controlled Nuclear Fusion Research 1990 (IAEA, Vienna, in press)] have emphasized the role of magnetic configuration control in transport studies. Long-pulse plasma operation up to 20 sec has been achieved with electron cyclotron heating (ECH). With neutral beam injection (NBI) power of ≥ 1 MW, global energy confinement times of 30 msec have been obtained with line-average densities up to 1.3 × 10²⁰ m^-3. The energy confinement and the operational space in ATF are roughly the same as those in tokamaks of similar size and field. The empirical scaling observed is similar to gyro-reduced Bohm scaling with favorable dependences on density and field offsetting an unfavorable power dependence. The toroidal current measured during ECH is identified as the bootstrap current. The observed currents agree well with predictions of neoclassical theory in magnitude and in parametric dependence. Variations of the magnetic configuration in discharges heated by ECH alone and by NBI change plasma transport and plasma profiles. Magnetic fluctuations respond to the concomitant pressure profile variations. Comparative studies of edge fluctuations in the Texas Experimental Tokamak (TEXT) [Plasma Physics and Controlled Nuclear Fusion Research 1990 (IAEA, Vienna, in press)] and the ATF stellarator showed remarkable similarity in the levels of fluctuations and the existence of a velocity shear layer.

Original language	English
Pages (from-to)	2261-2269
Number of pages	9
Journal	Physics of Fluids B
Volume	3
Issue number	8
DOIs	https://doi.org/10.1063/1.859645
State	Published - 1991

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10.1063/1.859645

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Murakami, M., Aceto, S. C., Anabitarte, E., Anderson, D. T., Anderson, F. S. B., Batchelor, D. B., Brañas, B., Baylor, L. R., Bell, G. L., Bell, J. D., Bigelow, T. S., Carreras, B. A., Colchin, R. J., Crocker, N. A., Crume, E. C., Dominguez, N., Dory, R. A., Dunlap, J. L., Dyer, G. R., ... Zielinski, J. J. (1991). Recent results from the ATF torsatron. Physics of Fluids B, 3(8), 2261-2269. https://doi.org/10.1063/1.859645

@article{2c3b949e6ee84db29495cac0c8a8475f,

title = "Recent results from the ATF torsatron",

abstract = "Recent experiments in the Advanced Toroidal Facility (ATF) torsatron [Plasma Physics and Controlled Nuclear Fusion Research 1990 (IAEA, Vienna, in press)] have emphasized the role of magnetic configuration control in transport studies. Long-pulse plasma operation up to 20 sec has been achieved with electron cyclotron heating (ECH). With neutral beam injection (NBI) power of ≥ 1 MW, global energy confinement times of 30 msec have been obtained with line-average densities up to 1.3 × 1020 m-3. The energy confinement and the operational space in ATF are roughly the same as those in tokamaks of similar size and field. The empirical scaling observed is similar to gyro-reduced Bohm scaling with favorable dependences on density and field offsetting an unfavorable power dependence. The toroidal current measured during ECH is identified as the bootstrap current. The observed currents agree well with predictions of neoclassical theory in magnitude and in parametric dependence. Variations of the magnetic configuration in discharges heated by ECH alone and by NBI change plasma transport and plasma profiles. Magnetic fluctuations respond to the concomitant pressure profile variations. Comparative studies of edge fluctuations in the Texas Experimental Tokamak (TEXT) [Plasma Physics and Controlled Nuclear Fusion Research 1990 (IAEA, Vienna, in press)] and the ATF stellarator showed remarkable similarity in the levels of fluctuations and the existence of a velocity shear layer.",

author = "M. Murakami and Aceto, {S. C.} and E. Anabitarte and Anderson, {D. T.} and Anderson, {F. S.B.} and Batchelor, {D. B.} and B. Bra{\~n}as and Baylor, {L. R.} and Bell, {G. L.} and Bell, {J. D.} and Bigelow, {T. S.} and Carreras, {B. A.} and Colchin, {R. J.} and Crocker, {N. A.} and Crume, {E. C.} and N. Dominguez and Dory, {R. A.} and Dunlap, {J. L.} and Dyer, {G. R.} and England, {A. C.} and Fowler, {R. H.} and Gandy, {R. F.} and Glowienka, {J. C.} and Goldfinger, {R. C.} and Goulding, {R. H.} and Hanson, {G. R.} and Harris, {J. H.} and C. Hidalgo and Hillis, {D. L.} and S. Hiroe and Hirshman, {S. P.} and Horton, {L. D.} and Howe, {H. C.} and Hutchinson, {D. P.} and Isler, {R. C.} and Jernigan, {T. C.} and H. Kaneko and M. Kwon and Langley, {R. A.} and Leboeuf, {J. N.} and Lee, {D. K.} and Lo, {D. H.C.} and Lynch, {V. E.} and Lyon, {J. F.} and Ma, {C. H.} and Menon, {M. M.} and Mioduszewski, {P. K.} and S. Morita and Morris, {R. N.} and Neilson, {G. H.} and Ochando, {M. A.} and S. Okamura and S. Paul and Qualls, {A. L.} and Rasmussen, {D. A.} and Richards, {R. K.} and Ritz, {Ch P.} and Rome, {J. A.} and J. Sanchez and Schwelberger, {J. G.} and Shaing, {K. C.} and Shepard, {T. D.} and Simpkins, {J. E.} and Thomas, {C. E.} and Tolliver, {J. S.} and T. Uckan and {Vander Sluis}, {K. L.} and Wade, {M. R.} and Wilgen, {J. B.} and Wing, {W. R.} and H. Yamada and Zielinski, {J. J.}",

year = "1991",

doi = "10.1063/1.859645",

language = "English",

volume = "3",

pages = "2261--2269",

journal = "Physics of Fluids B",

issn = "0899-8221",

number = "8",

}

Murakami, M, Aceto, SC, Anabitarte, E, Anderson, DT, Anderson, FSB, Batchelor, DB, Brañas, B, Baylor, LR, Bell, GL, Bell, JD, Bigelow, TS, Carreras, BA, Colchin, RJ, Crocker, NA, Crume, EC, Dominguez, N, Dory, RA, Dunlap, JL, Dyer, GR, England, AC, Fowler, RH, Gandy, RF, Glowienka, JC, Goldfinger, RC, Goulding, RH, Hanson, GR, Harris, JH, Hidalgo, C, Hillis, DL, Hiroe, S, Hirshman, SP, Horton, LD, Howe, HC, Hutchinson, DP, Isler, RC, Jernigan, TC, Kaneko, H, Kwon, M, Langley, RA, Leboeuf, JN, Lee, DK, Lo, DHC, Lynch, VE, Lyon, JF, Ma, CH, Menon, MM, Mioduszewski, PK, Morita, S, Morris, RN, Neilson, GH, Ochando, MA, Okamura, S, Paul, S, Qualls, AL, Rasmussen, DA, Richards, RK, Ritz, CP, Rome, JA, Sanchez, J, Schwelberger, JG, Shaing, KC, Shepard, TD, Simpkins, JE, Thomas, CE, Tolliver, JS, Uckan, T, Vander Sluis, KL, Wade, MR, Wilgen, JB, Wing, WR, Yamada, H & Zielinski, JJ 1991, 'Recent results from the ATF torsatron', Physics of Fluids B, vol. 3, no. 8, pp. 2261-2269. https://doi.org/10.1063/1.859645

TY - JOUR

T1 - Recent results from the ATF torsatron

AU - Murakami, M.

AU - Aceto, S. C.

AU - Anabitarte, E.

AU - Anderson, D. T.

AU - Anderson, F. S.B.

AU - Batchelor, D. B.

AU - Brañas, B.

AU - Baylor, L. R.

AU - Bell, G. L.

AU - Bell, J. D.

AU - Bigelow, T. S.

AU - Carreras, B. A.

AU - Colchin, R. J.

AU - Crocker, N. A.

AU - Crume, E. C.

AU - Dominguez, N.

AU - Dory, R. A.

AU - Dunlap, J. L.

AU - Dyer, G. R.

AU - England, A. C.

AU - Fowler, R. H.

AU - Gandy, R. F.

AU - Glowienka, J. C.

AU - Goldfinger, R. C.

AU - Goulding, R. H.

AU - Hanson, G. R.

AU - Harris, J. H.

AU - Hidalgo, C.

AU - Hillis, D. L.

AU - Hiroe, S.

AU - Hirshman, S. P.

AU - Horton, L. D.

AU - Howe, H. C.

AU - Hutchinson, D. P.

AU - Isler, R. C.

AU - Jernigan, T. C.

AU - Kaneko, H.

AU - Kwon, M.

AU - Langley, R. A.

AU - Leboeuf, J. N.

AU - Lee, D. K.

AU - Lo, D. H.C.

AU - Lynch, V. E.

AU - Lyon, J. F.

AU - Ma, C. H.

AU - Menon, M. M.

AU - Mioduszewski, P. K.

AU - Morita, S.

AU - Morris, R. N.

AU - Neilson, G. H.

AU - Ochando, M. A.

AU - Okamura, S.

AU - Paul, S.

AU - Qualls, A. L.

AU - Rasmussen, D. A.

AU - Richards, R. K.

AU - Ritz, Ch P.

AU - Rome, J. A.

AU - Sanchez, J.

AU - Schwelberger, J. G.

AU - Shaing, K. C.

AU - Shepard, T. D.

AU - Simpkins, J. E.

AU - Thomas, C. E.

AU - Tolliver, J. S.

AU - Uckan, T.

AU - Vander Sluis, K. L.

AU - Wade, M. R.

AU - Wilgen, J. B.

AU - Wing, W. R.

AU - Yamada, H.

AU - Zielinski, J. J.

PY - 1991

Y1 - 1991

N2 - Recent experiments in the Advanced Toroidal Facility (ATF) torsatron [Plasma Physics and Controlled Nuclear Fusion Research 1990 (IAEA, Vienna, in press)] have emphasized the role of magnetic configuration control in transport studies. Long-pulse plasma operation up to 20 sec has been achieved with electron cyclotron heating (ECH). With neutral beam injection (NBI) power of ≥ 1 MW, global energy confinement times of 30 msec have been obtained with line-average densities up to 1.3 × 1020 m-3. The energy confinement and the operational space in ATF are roughly the same as those in tokamaks of similar size and field. The empirical scaling observed is similar to gyro-reduced Bohm scaling with favorable dependences on density and field offsetting an unfavorable power dependence. The toroidal current measured during ECH is identified as the bootstrap current. The observed currents agree well with predictions of neoclassical theory in magnitude and in parametric dependence. Variations of the magnetic configuration in discharges heated by ECH alone and by NBI change plasma transport and plasma profiles. Magnetic fluctuations respond to the concomitant pressure profile variations. Comparative studies of edge fluctuations in the Texas Experimental Tokamak (TEXT) [Plasma Physics and Controlled Nuclear Fusion Research 1990 (IAEA, Vienna, in press)] and the ATF stellarator showed remarkable similarity in the levels of fluctuations and the existence of a velocity shear layer.

AB - Recent experiments in the Advanced Toroidal Facility (ATF) torsatron [Plasma Physics and Controlled Nuclear Fusion Research 1990 (IAEA, Vienna, in press)] have emphasized the role of magnetic configuration control in transport studies. Long-pulse plasma operation up to 20 sec has been achieved with electron cyclotron heating (ECH). With neutral beam injection (NBI) power of ≥ 1 MW, global energy confinement times of 30 msec have been obtained with line-average densities up to 1.3 × 1020 m-3. The energy confinement and the operational space in ATF are roughly the same as those in tokamaks of similar size and field. The empirical scaling observed is similar to gyro-reduced Bohm scaling with favorable dependences on density and field offsetting an unfavorable power dependence. The toroidal current measured during ECH is identified as the bootstrap current. The observed currents agree well with predictions of neoclassical theory in magnitude and in parametric dependence. Variations of the magnetic configuration in discharges heated by ECH alone and by NBI change plasma transport and plasma profiles. Magnetic fluctuations respond to the concomitant pressure profile variations. Comparative studies of edge fluctuations in the Texas Experimental Tokamak (TEXT) [Plasma Physics and Controlled Nuclear Fusion Research 1990 (IAEA, Vienna, in press)] and the ATF stellarator showed remarkable similarity in the levels of fluctuations and the existence of a velocity shear layer.

UR - http://www.scopus.com/inward/record.url?scp=0342501689&partnerID=8YFLogxK

U2 - 10.1063/1.859645

DO - 10.1063/1.859645

M3 - Article

AN - SCOPUS:0342501689

SN - 0899-8221

VL - 3

SP - 2261

EP - 2269

JO - Physics of Fluids B

JF - Physics of Fluids B

IS - 8

ER -

Recent results from the ATF torsatron

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