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52. Overview of results from the ATF torsatron

Author

Colchin, R. J., primary, Murakami, M., additional, Anabitarte, E., additional, Anderson, F. S. B., additional, Bell, G. L., additional, Bell, J. D., additional, Bigelow, T. S., additional, Crume, E. C., additional, Dunlap, J. L., additional, Dyer, G. R., additional, England, A. C., additional, Fisher, P. W., additional, Gabbard, W. A., additional, Glowienka, J. C., additional, Goulding, R. H., additional, Halliwell, J. W., additional, Hanson, G. R., additional, Harris, J. H., additional, Haste, G. R., additional, Hidalgo-Vera, C., additional, Hillis, D. L., additional, Hiroe, S., additional, Horton, L. D., additional, Howe, H. C., additional, Hutchinson, D. P., additional, Isler, R. C., additional, Jernigan, T. C., additional, Kwon, M., additional, Langley, R. A., additional, Lee, D. K., additional, Lyon, J. F., additional, Lue, J. W., additional, Ma, C. H., additional, Menon, M. M., additional, Morris, R. N., additional, Mioduszewski, P. K., additional, Neilson, G. H., additional, Qualls, A. L., additional, Rasmussen, D. A., additional, Rogers, P. S., additional, Shaw, P. L., additional, Shepard, T. D., additional, Simpkins, J. E., additional, Sudo, S., additional, Thomas, C. E., additional, Uckan, T., additional, Wade, M. R., additional, Wilgen, J. B., additional, Wing, W. R., additional, Yamada, H., additional, and Zielinski, J. J., additional

Published
1990
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53. Second stability in the ATF torsatron—Experiment and theory

Author

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

Published
1990
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54. Construction and Initial Operation of the Advanced Toroidal Facility

Author

Lyon, J. F., primary, Bell, G. L., additional, Bell, J. D., additional, Benson, R. D., additional, Bigelow, T. S., additional, Chipley, K. K., additional, Colchin, R. J., additional, Cole, M. J., additional, Crume, E. C., additional, Dunlap, J. L., additional, England, A. C., additional, Glowienka, J. C., additional, Goulding, R. H., additional, Harris, J. H., additional, Hillis, D. L., additional, Hiroe, S., additional, Horton, L. D., additional, Howe, H. C., additional, Isler, R. C., additional, Jernigan, T. C., additional, Johnson, R. L., additional, Langley, R. A., additional, Menon, M. M., additional, Mioduszewski, P. K., additional, Morris, R. N., additional, Murakami, M., additional, Neilson, G. H., additional, Nelson, B. E., additional, Rasmussen, D. A., additional, Rome, J. A., additional, Saltmarsh, M. J., additional, Thompson, P. B., additional, Wade, M. R., additional, White, J. A., additional, White, T. L., additional, Whitson, J. C., additional, Wilgen, J. B., additional, and Wing, W. R., additional

Published
1990
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55. Realization of the Advanced Toroidal Facility Torsatron Magnetic Field

Author

Harris, J. H., primary, Jernigan, T. C., additional, Anderson, F. S. B., additional, Benson, R. D., additional, Colchin, R. J., additional, Cole, M. J., additional, England, A. C., additional, Gandy, R. F., additional, Henderson, M. A., additional, Hillis, D. L., additional, Johnson, R. L., additional, Lee, D. K., additional, Lyon, J. F., additional, Neilson, G. H., additional, Nelson, B. E., additional, Rome, J. A., additional, Saltmarsh, M. J., additional, Simpson, C. W., additional, Taylor, D. J., additional, Thompson, P. B., additional, and Whitson, J. C., additional

Published
1990
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56. External inductance of an axisymmetric plasma.

Author

Hirshman, S. P. and Neilson, G. H.

Subjects
*ELECTRIC inductance, *PLASMA gases, *GREEN'S functions
Abstract

The external inductance of an axisymmetric toroidal plasma with an arbitrary aspect ratio and cross section is obtained using a Green’s function method. By varying an equivalent skin current density over the plasma surface, while keeping the total toroidal current fixed, the plasma boundary is made to coincide with a magnetic surface. Numerical computations of the self-inductance and mutual inductance as functions of aspect ratio and elongation are fitted to simple analytic formulas. The effect of distributed plasma current on the volt-seconds required to reach a prescribed net current is considered. [ABSTRACT FROM AUTHOR]

Published
1986
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58. Electron beam and magnetic field mapping techniques used to determine field errors in the ATF torsatron.

Author

Colchin, R. J., Anderson, F. S. B., England, A. C., Gandy, R. F., Harris, J. H., Henderson, M. A., Hillis, D. L., Kindsfather, R. R., Lee, D. K., Million, D. L., Murakami, M., Neilson, G. H., Saltmarsh, M. J., and Simpson, C. M.

Subjects
ELECTRON beams, MAGNETIC fields, PHOSPHORS
Abstract

The beam from an electron gun was used to trace flux surfaces in the Advanced Toroidal Facility (ATF) torsatron. The ATF magnetic field was run steady state at 0.1 T, and the electron beam was detected optically with an image-intensified, solid-state camera when it impinged on a phosphor-coated screen. Closed flux surfaces and islands at several low-order resonances were observed. The largest island, located at the t = ½ surface, was from 5 to 6 cm in width, and its presence implied the existence of magnetic field errors. To determine if these error fields could be traced to small misalignments of the magnetic coils, a device capable of accurately measuring the radial and vertical magnetic field components of individual coil sets was placed in the center of ATF. This device allowed for a determination of the precise location of each of the coils that make up the ATF coil set. No significant coil misalignments were found. A further investigation of the coil configuration led to the identification of dipole fields in the helical field coil leads as the source of the field errors. The techniques developed in making these measurements are described in the text. [ABSTRACT FROM AUTHOR]

Published
1989
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59. Diagnosis and natural history of Ebstein's anomaly.

Author

Radford, D J, Graff, R F, and Neilson, G H

Abstract

Thirty five cases of Ebstein's anomaly were diagnosed by cardiac catheter study or echocardiography between 1962 and 1984. The anomaly was an isolated abnormality in 27 patients; the remainder had additional heart lesions. Six patients have died and four of these had other cardiac lesions. Thirteen are currently symptom free. Twelve cases presented with cyanosis and heart murmur on the first day of life. Eight of these had associated thrill which is a rare finding in neonates. As pulmonary vascular resistance fell there was clinical improvement. This was assisted by oxygen treatment. Another two cases presented in the first week of life and 10 in the first decade with a murmur or supraventricular tachycardia. Eleven cases presented as adolescents or adults with a murmur, cardiomegaly, or cardiac symptoms. Three patients were seen initially in the sixth decade. Clinical diagnosis was correct in only one adult. Twenty five patients had cardiac catheterisation. Important arrhythmias occurred in 10 cases, and two required cardioversion. Difficulty was experienced in entering the pulmonary artery in 11 infants and children. Diagnosis at initial catheter study was incorrect in four patients. Echocardiograms were recorded in 29 cases. Earlier M mode measurements of time delay of tricuspid closure compared with mitral closure did not always lead to the correct diagnosis. Cross sectional studies gave good images of tricuspid leaflet displacement, its tethering, and the atrialised portion of the right ventricle and have facilitated the diagnosis of more cases in recent years. Echocardiography is the procedure of choice for diagnosis of Ebstein's anomaly. [ABSTRACT FROM PUBLISHER]

Published
1985
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63. Wave absorption at the second harmonic of the electron-cyclotron frequency in a tokamak plasma.

Author

McDermott, F. S., Bekefi, G., England, A. C., Attenberger, S. E., Batchelor, D. B., Edmonds, P. H., Goldfinger, R. C., Kindsfather, R. R., Lazarus, E. A., Murakami, M., Neilson, G. H., Wilgen, J. B., and Wootton, A. J.

Subjects
WAVES (Physics), ABSORPTION, SECOND harmonic generation
Abstract

Wave absorption in the ISX-B tokamak [Phys. Rev. Lett. 44, 647 (1980)] at the second harmonic (ω = 2ω[sub ce]) of the electron-cyclotron frequency is reported. Measurements of the absorption of a wave polarized in the extraordinary mode and propagating perpendicular to the toroidal magnetic field are in agreement with computations. [ABSTRACT FROM AUTHOR]

Published
1985
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64. Second stability in the ATF torsatron-experiment and theory

Author

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., Hiroe, S., Horton, L. D., Howe, H. C., Ralph Isler, Jemigan, T. C., Kaneko, H., Leboeuf, J. N., Lee, D. K., Lynch, V. E., Lyon, J. F., Menon, M. M., Morris, R. N., Murakami, M., Neilson, G. H., Paré, V. K., Rasmussen, D. A., Thomas, C. E., Uckan, T., Wade, M. R., Wilgen, J. B., and Wing, W. R.

65. Role of stellarators in understanding toroidal transport physics

Author

Rasmussen, D. A., Anderson, F. S. B., Bell, G. L., Bell, J. D., Bengtson, R. D., Bigelow, T. S., Carreras, B. A., Carter, K. R., Colchin, R. J., Crume, E. C., Dominguez, N., Dunlap, J. L., England, A. C., Fowler, R. H., Gandy, R. F., Glowienka, J. C., Hiroe, S., Harris, J. H., Hillis, D. L., Horton, L. D., Howe, H. C., Ralph Isler, Jernigan, T. C., Kaneko, H., Kindsfather, R. R., Leboeuf, J. N., Lynch, V. E., Lyon, J. F., Ma, C. H., Menon, M. M., Mioduszewski, P. K., Morris, R. N., Murakami, M., Neilson, G. H., Pare, V. K., Rhodes, T. L., Richards, R. K., Ritz, C. P., Rome, J. A., Thomas, C. E., Uckan, T., Wade, M. C., Wilgen, J. B., and Wing, W. R.

67. Measurements of flux surfaces in the ATF torsatron

Author

England, A. C., Anderson, F. S. B., Colchin, R. J., Gandy, R. F., Hanson, J. D., Harris, J. H., Henderson, M. A., Hillis, D. L., Jernigan, T. C., Lee, D. K., Vickie Lynch, Million, D. L., Murakami, M., Neilson, G. H., Rome, J. A., Saltmarsh, M. J., and Simpson, C. M.

Subjects
Physics, Toroid, Quality (physics), Nuclear magnetic resonance, Field (physics), Electromagnetic coil, Flux, Plasma diagnostics, Atomic physics, Magnetic dipole, Magnetic field
Abstract

Flux surfaces in the Advanced Toroidal Facility (ATF) torsatron have been measured using electron-beam techniques. In initial measurements, the flux surfaces were found to have islands at the location of low-order resonances, e.g., at m/n=2, signifying the existence of field errors. Measurements made for different values of B/sub 0/ between -0.1 and +0.1 T showed that the island width was approximately constant at 5-6 cm, indicating that the error field was proportional to the main field. Modeling studies showed that the major field errors were due to uncompensated current feeds to the helical and vertical field coils producing magnetic dipoles. After modifications to the coil systems were made to compensate for the field errors, the flux surface measurements were repeated at fields up to 1 T. They indicate that the island at m/n=2 has been largely reduced in size to approximately 2.6 cm at B/sub 0/=0.1 T, but that others, e.g., m/n=3, have grown. The surfaces in the confinement zone between are of much better quality, with significantly reduced isolation. The island at m/n=2 appears to scale with magnetic field in a manner consistent with a field error due only to a constant external field, whereas the island at m/n=3 does not scale with magnetic field, indicating an intrinsic field error. >

70. Second stability in the ATF torsatron

Author

Harris, J. H., primary, Murakami, M., additional, Carreras, B. A., additional, Bell, J. D., additional, Bell, G. L., additional, Bigelow, T. S., additional, Charlton, L. A., additional, Dominguez, N., additional, Dunlap, J. L., additional, Glowienka, J. C., additional, Horton, L. D., additional, Howe, H. C., additional, Isler, R. C., additional, Kaneko, H., additional, Kindsfather, R. R., additional, Leboeuf, J. N., additional, Lynch, V. E., additional, Menon, M. M., additional, Morris, R. N., additional, Neilson, G. H., additional, Paré, V. K., additional, Rasmussen, D. A., additional, Wilgen, J. B., additional, and Wing, W. R., additional

Published
1989
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71. Experimental Observation of the Impurity-Flow-Reversal Effect in a Tokamak Plasma

Author

Burrell, Keith H., primary, DeBoo, J. C., additional, Ensberg, E. S., additional, Prater, Ronald, additional, Wong, Seung Kai, additional, Bush, C. E., additional, Colchin, R. J., additional, Edmonds, P. H., additional, Hill, K. W., additional, Isler, R. C., additional, Jernigan, Thomas C., additional, Murakami, M., additional, and Neilson, G. H., additional

Published
1978
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73. Plasma Confinement Studies in the ISX-ATokamak

Author

Murakami, M., primary, Neilson, G. H., additional, Howe, H. C., additional, Jernigan, T. C., additional, Bates, S. C., additional, Bush, C. E., additional, Colchin, R. J., additional, Dunlap, J. L., additional, Edmonds, P. H., additional, Hill, K. W., additional, Isler, R. C., additional, Ketterer, H. E., additional, King, P. W., additional, McNeill, D. W., additional, Mihalczo, J. T., additional, Neidigh, R. V., additional, Pare, V. K., additional, Saltmarsh, M. J., additional, Wilgen, J. B., additional, and Zurro, B., additional

Published
1979
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92. Experimental results on tokamak beta limits from ISX-B.

Author

Neilson, G. H., Wootton, A. J., Bell, J. D., Bush, C. E., Carnevali, A., Dunlap, J. L., Edmonds, P. H., England, A. C., Gardner, W. L., Howe, H. C., Hutchinson, D. P., Kindsfather, R. R., Isler, R. C., Langley, R. A., Lazarus, E. A., Ma, C. H., Murakami, M., Paré, V. K., Scott, S. D., and Thomas, C. E.

Published
1985
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94. Measurements of periodic ripple transport in the ISX-B tokamak.

Author

Scott, S. D., Lyon, J. F., Munro, J. K., Sigmar, D. J., Bates, S. C., Bell, J. D., Bush, C. E., Carnevali, A., Dunlap, J. L., Edmonds, P. H., Gardner, W. L., Howe, H. C., Hutchinson, D. P., Isler, R. C., Kindsfather, R. R., Lazarus, E. A., Ma, C. H., Murakami, M., Murray, L. E., and Neilson, G. H.

Published
1985
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