A comparison of sawtooth oscillations in bean and oval shaped plasmas

E. A. Lazarus; F. L. Waelbroeck; T. C. Luce; M. E. Austin; K. H. Burrell; J. R. Ferron; A. W. Hyatt; T. H. Osborne; M. S. Chu; D. P. Brennan; P. Gohil; R. J. Groebner; C. L. Hsieh; R. J. Jayakumar; L. L. Lao; J. Lohr; M. A. Makowski; C. C. Petty; P. A. Politzer; R. Prater; T. L. Rhodes; J. T. Scoville; E. J. Strait; A. D. Turnbull; M. R. Wade; G. Wang; H. Reimerdes; C. Zhang

doi:10.1088/0741-3335/48/8/L01

A comparison of sawtooth oscillations in bean and oval shaped plasmas

E. A. Lazarus, F. L. Waelbroeck, T. C. Luce, M. E. Austin, K. H. Burrell, J. R. Ferron, A. W. Hyatt, T. H. Osborne, M. S. Chu, D. P. Brennan, P. Gohil, R. J. Groebner, C. L. Hsieh, R. J. Jayakumar, L. L. Lao, J. Lohr, M. A. Makowski, C. C. Petty, P. A. Politzer, R. PraterT. L. Rhodes, J. T. Scoville, E. J. Strait, A. D. Turnbull, M. R. Wade, G. Wang, H. Reimerdes, C. Zhang

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Abstract

The effect of plasma shape on sawtooth oscillations in the DIII-D tokamak plasmas is investigated by comparing discharges with cross-sections shaped like a bean and an oval. The two shapes are designed so that the Mercier instability threshold is reached when the axial safety factor is below unity for the bean and above unity for the oval cross-sections. This allows the role of interchange modes to be differentiated from that of the kink-tearing mode. The differences in the nature of the sawtooth oscillations in the bean and oval discharges are found to be determined primarily by extreme differences in the electron heat transport during the reheat. In both cases, the axial safety factor is found to be near unity following the crash.

Original language	English
Article number	L01
Pages (from-to)	L65-L72
Journal	Plasma Physics and Controlled Fusion
Volume	48
Issue number	8
DOIs	https://doi.org/10.1088/0741-3335/48/8/L01
State	Published - Aug 1 2006
Externally published	Yes

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Lazarus, E. A., Waelbroeck, F. L., Luce, T. C., Austin, M. E., Burrell, K. H., Ferron, J. R., Hyatt, A. W., Osborne, T. H., Chu, M. S., Brennan, D. P., Gohil, P., Groebner, R. J., Hsieh, C. L., Jayakumar, R. J., Lao, L. L., Lohr, J., Makowski, M. A., Petty, C. C., Politzer, P. A., ... Zhang, C. (2006). A comparison of sawtooth oscillations in bean and oval shaped plasmas. Plasma Physics and Controlled Fusion, 48(8), L65-L72. Article L01. https://doi.org/10.1088/0741-3335/48/8/L01

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title = "A comparison of sawtooth oscillations in bean and oval shaped plasmas",

abstract = "The effect of plasma shape on sawtooth oscillations in the DIII-D tokamak plasmas is investigated by comparing discharges with cross-sections shaped like a bean and an oval. The two shapes are designed so that the Mercier instability threshold is reached when the axial safety factor is below unity for the bean and above unity for the oval cross-sections. This allows the role of interchange modes to be differentiated from that of the kink-tearing mode. The differences in the nature of the sawtooth oscillations in the bean and oval discharges are found to be determined primarily by extreme differences in the electron heat transport during the reheat. In both cases, the axial safety factor is found to be near unity following the crash.",

author = "Lazarus, {E. A.} and Waelbroeck, {F. L.} and Luce, {T. C.} and Austin, {M. E.} and Burrell, {K. H.} and Ferron, {J. R.} and Hyatt, {A. W.} and Osborne, {T. H.} and Chu, {M. S.} and Brennan, {D. P.} and P. Gohil and Groebner, {R. J.} and Hsieh, {C. L.} and Jayakumar, {R. J.} and Lao, {L. L.} and J. Lohr and Makowski, {M. A.} and Petty, {C. C.} and Politzer, {P. A.} and R. Prater and Rhodes, {T. L.} and Scoville, {J. T.} and Strait, {E. J.} and Turnbull, {A. D.} and Wade, {M. R.} and G. Wang and H. Reimerdes and C. Zhang",

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Lazarus, EA, Waelbroeck, FL, Luce, TC, Austin, ME, Burrell, KH, Ferron, JR, Hyatt, AW, Osborne, TH, Chu, MS, Brennan, DP, Gohil, P, Groebner, RJ, Hsieh, CL, Jayakumar, RJ, Lao, LL, Lohr, J, Makowski, MA, Petty, CC, Politzer, PA, Prater, R, Rhodes, TL, Scoville, JT, Strait, EJ, Turnbull, AD, Wade, MR, Wang, G, Reimerdes, H & Zhang, C 2006, 'A comparison of sawtooth oscillations in bean and oval shaped plasmas', Plasma Physics and Controlled Fusion, vol. 48, no. 8, L01, pp. L65-L72. https://doi.org/10.1088/0741-3335/48/8/L01

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AU - Luce, T. C.

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AU - Burrell, K. H.

AU - Ferron, J. R.

AU - Hyatt, A. W.

AU - Osborne, T. H.

AU - Chu, M. S.

AU - Brennan, D. P.

AU - Gohil, P.

AU - Groebner, R. J.

AU - Hsieh, C. L.

AU - Jayakumar, R. J.

AU - Lao, L. L.

AU - Lohr, J.

AU - Makowski, M. A.

AU - Petty, C. C.

AU - Politzer, P. A.

AU - Prater, R.

AU - Rhodes, T. L.

AU - Scoville, J. T.

AU - Strait, E. J.

AU - Turnbull, A. D.

AU - Wade, M. R.

AU - Wang, G.

AU - Reimerdes, H.

AU - Zhang, C.

PY - 2006/8/1

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N2 - The effect of plasma shape on sawtooth oscillations in the DIII-D tokamak plasmas is investigated by comparing discharges with cross-sections shaped like a bean and an oval. The two shapes are designed so that the Mercier instability threshold is reached when the axial safety factor is below unity for the bean and above unity for the oval cross-sections. This allows the role of interchange modes to be differentiated from that of the kink-tearing mode. The differences in the nature of the sawtooth oscillations in the bean and oval discharges are found to be determined primarily by extreme differences in the electron heat transport during the reheat. In both cases, the axial safety factor is found to be near unity following the crash.

AB - The effect of plasma shape on sawtooth oscillations in the DIII-D tokamak plasmas is investigated by comparing discharges with cross-sections shaped like a bean and an oval. The two shapes are designed so that the Mercier instability threshold is reached when the axial safety factor is below unity for the bean and above unity for the oval cross-sections. This allows the role of interchange modes to be differentiated from that of the kink-tearing mode. The differences in the nature of the sawtooth oscillations in the bean and oval discharges are found to be determined primarily by extreme differences in the electron heat transport during the reheat. In both cases, the axial safety factor is found to be near unity following the crash.

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JF - Plasma Physics and Controlled Fusion

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A comparison of sawtooth oscillations in bean and oval shaped plasmas

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