Safety factor on the axis of a tokamak during Ohmically heated sawtoothing discharges from a localized measurement of circular polarization of the Li I 6708 Å line

• Published in: Physics of fluids. B, Plasma physics Plasma physics, 1990-04, Vol.2 (4), p.809-814
• Main Authors: HUANG, L. K, FINKENTHAL, M, BENGTSON, R. D, BOEDO, J. A, BRAVENEC, R. V, CHEN, J. Y, CIMA, G, GENTLE, K. W, MCCOOL, S. C, RICHARDS, B. U, ROWAN, W. L, SING, D. C, WROBLEWSKI, D, MOOS, H. W, WEST, W. P, THOMAS, D. M, THOMAS, M. P, YANG, X. Z, PHILLIPS, P. E, WOOTTON, A. J
• Format: Article
• Language: English
• Subjects: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 700102 - Fusion Energy- Plasma Research- Diagnostics; 700107 - Fusion Energy- Plasma Research- Instabilities; ALKALI METALS; ATOMIC BEAMS; BEAMS; CLOSED PLASMA DEVICES; ELECTRIC DISCHARGES; ELECTRIC HEATING; ELEMENTS; EMISSION SPECTRA; Exact sciences and technology; FEDERAL REGION VI; HEATING; IMPURITIES; INSTABILITY; JOULE HEATING; LITHIUM; MAGNETIC FIELD CONFIGURATIONS; MAGNETIC FIELDS; METALS; NORTH AMERICA; OSCILLATIONS; Physics; Physics of gases, plasmas and electric discharges; Physics of plasmas and electric discharges; Plasma diagnostic techniques and instrumentation; PLASMA DIAGNOSTICS; PLASMA HEATING; PLASMA INSTABILITY; POLARIZATION; RESISTANCE HEATING; SAWTOOTH OSCILLATIONS; SPECTRA; TEXAS; THERMONUCLEAR DEVICES; TOKAMAK DEVICES; USA
• ISSN: 0899-8221; 2163-503X
• DOI: 10.1063/1.859317

Analysis of the circular polarization of the Lii 6708 Å line emitted from a monoenergetic lithium beam provides a spatially resolved measurement of the poloidal magnetic field on the Texas experimental tokamak [Nucl. Technol. Fusion 1, 479 (1989)]. Determined from the measured magnetic field, the safety factor on the magnetic axis during Ohmically heated sawtoothing discharges is near unity.