Second stability in the ATF torsatron-experiment and theory

J. H. Harris; E. Anabitarte; G. L. Bell; J. D. Bell; T. S. Bigelow; B. A. Carreras; L. A. Chariton; R. J. Colchin; E. C. Crume; N. Dominguez; J. L. Dunlap; G. R. Dyer; A. C. England; R. F. Gandy; J. C. Glowienka; J. W. Halliwell; G. R. Hanson; C. Hidalgo-Vera; D. L. Hillis; S. Hiroe; L. D. Horton; H. C. Howe; R. C. Isler; T. C. Jemigan; H. Kaneko; J. N. Leboeuf; D. K. Lee; V. E. Lynch; J. F. Lyon; M. M. Menon; R. N. Morris; M. Murakami; G. H. Neilson; V. K. Paré; D. A. Rasmussen; C. E. Thomas; T. Uckan; M. R. Wade; J. B. Wilgen; W. R. Wing

doi:10.1063/1.859555

Second stability in the ATF torsatron-experiment and theory

J. H. Harris, E. Anabitarte, G. L. Bell, J. D. Bell, T. S. Bigelow, B. A. Carreras, L. A. Chariton, R. J. Colchin, E. C. Crume, N. Dominguez, J. L. Dunlap, G. R. Dyer, A. C. England, R. F. Gandy, J. C. Glowienka, J. W. Halliwell, G. R. Hanson, C. Hidalgo-Vera, D. L. Hillis, S. HiroeL. D. Horton, H. C. Howe, R. C. Isler, T. C. Jemigan, H. Kaneko, J. N. Leboeuf, D. K. Lee, V. E. Lynch, J. F. Lyon, M. M. Menon, R. N. Morris, M. Murakami, G. H. Neilson, V. K. Paré, D. A. Rasmussen, C. E. Thomas, T. Uckan, M. R. Wade, J. B. Wilgen, W. R. Wing

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Abstract

Access to the magnetohydrodynamic (MHD) second stability regime has been achieved in the Advanced Toroidal Facility (ATF) torsatron [Fusion Technol. 10, 179 (1986)]. Operation with a field error that reduced the plasma radius and edge rotational transform resulted in peaked pressure profiles and increased Shafranov shift that lowered the theoretical transition to ideal MHD second stability to β₀≈1.3%; the experimental β values (β₀≤3%) are well above this transition. The measured magnetic fluctuations decrease with increasing β, and the pressure profile broadens, consistent with the theoretical expectations for self-stabilization of resistive interchange modes. Initial results from experiments with the field error removed show that the pressure profile is now broader. These later discharges are characterized by a transition to improved (X2-3) confinement and a marked change in the edge density fluctuation spectrum, but the causal relationship of these changes is not yet clear.

Original language	English
Pages (from-to)	1353-1358
Number of pages	6
Journal	Physics of Fluids B
Volume	2
Issue number	6
DOIs	https://doi.org/10.1063/1.859555
State	Published - 1990

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Harris, J. H., Anabitarte, E., Bell, G. L., Bell, J. D., Bigelow, T. S., Carreras, B. A., Chariton, L. A., Colchin, R. J., Crume, E. C., Dominguez, N., Dunlap, J. L., Dyer, G. R., England, A. C., Gandy, R. F., Glowienka, J. C., Halliwell, J. W., Hanson, G. R., Hidalgo-Vera, C., Hillis, D. L., ... Wing, W. R. (1990). Second stability in the ATF torsatron-experiment and theory. Physics of Fluids B, 2(6), 1353-1358. https://doi.org/10.1063/1.859555

@article{9ab5c50b47c042da91135afae4a33855,

title = "Second stability in the ATF torsatron-experiment and theory",

abstract = "Access to the magnetohydrodynamic (MHD) second stability regime has been achieved in the Advanced Toroidal Facility (ATF) torsatron [Fusion Technol. 10, 179 (1986)]. Operation with a field error that reduced the plasma radius and edge rotational transform resulted in peaked pressure profiles and increased Shafranov shift that lowered the theoretical transition to ideal MHD second stability to β0≈1.3%; the experimental β values (β0≤3%) are well above this transition. The measured magnetic fluctuations decrease with increasing β, and the pressure profile broadens, consistent with the theoretical expectations for self-stabilization of resistive interchange modes. Initial results from experiments with the field error removed show that the pressure profile is now broader. These later discharges are characterized by a transition to improved (X2-3) confinement and a marked change in the edge density fluctuation spectrum, but the causal relationship of these changes is not yet clear.",

author = "Harris, {J. H.} and E. Anabitarte and Bell, {G. L.} and Bell, {J. D.} and Bigelow, {T. S.} and Carreras, {B. A.} and Chariton, {L. A.} and Colchin, {R. J.} and Crume, {E. C.} and N. Dominguez and Dunlap, {J. L.} and Dyer, {G. R.} and England, {A. C.} and Gandy, {R. F.} and Glowienka, {J. C.} and Halliwell, {J. W.} and Hanson, {G. R.} and C. Hidalgo-Vera and Hillis, {D. L.} and S. Hiroe and Horton, {L. D.} and Howe, {H. C.} and Isler, {R. C.} and Jemigan, {T. C.} and H. Kaneko and Leboeuf, {J. N.} and Lee, {D. K.} and Lynch, {V. E.} and Lyon, {J. F.} and Menon, {M. M.} and Morris, {R. N.} and M. Murakami and Neilson, {G. H.} and Par{\'e}, {V. K.} and Rasmussen, {D. A.} and Thomas, {C. E.} and T. Uckan and Wade, {M. R.} and Wilgen, {J. B.} and Wing, {W. R.}",

year = "1990",

doi = "10.1063/1.859555",

language = "English",

volume = "2",

pages = "1353--1358",

journal = "Physics of Fluids B",

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Harris, JH, Anabitarte, E, Bell, GL, Bell, JD, Bigelow, TS, Carreras, BA, Chariton, LA, Colchin, RJ, Crume, EC, Dominguez, N, Dunlap, JL, Dyer, GR, England, AC, Gandy, RF, Glowienka, JC, Halliwell, JW, Hanson, GR, Hidalgo-Vera, C, Hillis, DL, Hiroe, S, Horton, LD, Howe, HC, Isler, RC, Jemigan, TC, Kaneko, H, Leboeuf, JN, Lee, DK, Lynch, VE, Lyon, JF, Menon, MM, Morris, RN, Murakami, M, Neilson, GH, Paré, VK, Rasmussen, DA, Thomas, CE, Uckan, T, Wade, MR, Wilgen, JB & Wing, WR 1990, 'Second stability in the ATF torsatron-experiment and theory', Physics of Fluids B, vol. 2, no. 6, pp. 1353-1358. https://doi.org/10.1063/1.859555

TY - JOUR

T1 - Second stability in the ATF torsatron-experiment and theory

AU - Harris, J. H.

AU - Anabitarte, E.

AU - Bell, G. L.

AU - Bell, J. D.

AU - Bigelow, T. S.

AU - Carreras, B. A.

AU - Chariton, L. A.

AU - Colchin, R. J.

AU - Crume, E. C.

AU - Dominguez, N.

AU - Dunlap, J. L.

AU - Dyer, G. R.

AU - England, A. C.

AU - Gandy, R. F.

AU - Glowienka, J. C.

AU - Halliwell, J. W.

AU - Hanson, G. R.

AU - Hidalgo-Vera, C.

AU - Hillis, D. L.

AU - Hiroe, S.

AU - Horton, L. D.

AU - Howe, H. C.

AU - Isler, R. C.

AU - Jemigan, T. C.

AU - Kaneko, H.

AU - Leboeuf, J. N.

AU - Lee, D. K.

AU - Lynch, V. E.

AU - Lyon, J. F.

AU - Menon, M. M.

AU - Morris, R. N.

AU - Murakami, M.

AU - Neilson, G. H.

AU - Paré, V. K.

AU - Rasmussen, D. A.

AU - Thomas, C. E.

AU - Uckan, T.

AU - Wade, M. R.

AU - Wilgen, J. B.

AU - Wing, W. R.

PY - 1990

Y1 - 1990

N2 - Access to the magnetohydrodynamic (MHD) second stability regime has been achieved in the Advanced Toroidal Facility (ATF) torsatron [Fusion Technol. 10, 179 (1986)]. Operation with a field error that reduced the plasma radius and edge rotational transform resulted in peaked pressure profiles and increased Shafranov shift that lowered the theoretical transition to ideal MHD second stability to β0≈1.3%; the experimental β values (β0≤3%) are well above this transition. The measured magnetic fluctuations decrease with increasing β, and the pressure profile broadens, consistent with the theoretical expectations for self-stabilization of resistive interchange modes. Initial results from experiments with the field error removed show that the pressure profile is now broader. These later discharges are characterized by a transition to improved (X2-3) confinement and a marked change in the edge density fluctuation spectrum, but the causal relationship of these changes is not yet clear.

AB - Access to the magnetohydrodynamic (MHD) second stability regime has been achieved in the Advanced Toroidal Facility (ATF) torsatron [Fusion Technol. 10, 179 (1986)]. Operation with a field error that reduced the plasma radius and edge rotational transform resulted in peaked pressure profiles and increased Shafranov shift that lowered the theoretical transition to ideal MHD second stability to β0≈1.3%; the experimental β values (β0≤3%) are well above this transition. The measured magnetic fluctuations decrease with increasing β, and the pressure profile broadens, consistent with the theoretical expectations for self-stabilization of resistive interchange modes. Initial results from experiments with the field error removed show that the pressure profile is now broader. These later discharges are characterized by a transition to improved (X2-3) confinement and a marked change in the edge density fluctuation spectrum, but the causal relationship of these changes is not yet clear.

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U2 - 10.1063/1.859555

DO - 10.1063/1.859555

M3 - Article

AN - SCOPUS:0347194018

SN - 0899-8221

VL - 2

SP - 1353

EP - 1358

JO - Physics of Fluids B

JF - Physics of Fluids B

IS - 6

ER -

Second stability in the ATF torsatron-experiment and theory

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