Effect of toroidal field ripple on the formation of internal transport barriers

P. C. de Vries (Corresponding Author), E. Joffrin, N. C. Hawkes, X. Litaudon, C. D. Challis, Y. Andrew, M. Beurskens, M. Brix, J, Brzozowski, K. Crombe, C. Giroud, J. Hobirk, T. Johnson, J. Lönnroth, Antti Salmi, Tuomas Tala, V. Yavorskij, K.-D. Zastrow, JET-EFDA Contributors

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Abstract

The effect of a toroidal field (TF) ripple on the formation and performance of internal transport barriers (ITBs) has been studied in JET. It was found that the TF ripple had a profound effect on the toroidal plasma rotation. An increased TF ripple up to δ = 1% led to a lower rotation and reduced the rotational shear in the region where the ITBs were formed. ITB triggering events were observed in all cases and it is thought that the rotational shear may be less important for this process than, for example, the q-profile. However, the increase in the pressure gradient following the ITB trigger was reduced in discharges with a larger TF ripple and consequently a lower rotational shear. This suggests that toroidal rotation and its shear play a role in the growth of the ITB once it has been triggered.
Original languageEnglish
Article number065008
Number of pages12
JournalPlasma Physics and Controlled Fusion
Volume50
Issue number6
DOIs
Publication statusPublished - 2008
MoE publication typeA1 Journal article-refereed

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ripples
shear
Pressure gradient
toroidal plasmas
Plasmas
pressure gradients
actuators
profiles

Cite this

de Vries, P. C., Joffrin, E., Hawkes, N. C., Litaudon, X., Challis, C. D., Andrew, Y., ... JET-EFDA Contributors (2008). Effect of toroidal field ripple on the formation of internal transport barriers. Plasma Physics and Controlled Fusion, 50(6), [065008]. https://doi.org/10.1088/0741-3335/50/6/065008
de Vries, P. C. ; Joffrin, E. ; Hawkes, N. C. ; Litaudon, X. ; Challis, C. D. ; Andrew, Y. ; Beurskens, M. ; Brix, M. ; Brzozowski, J, ; Crombe, K. ; Giroud, C. ; Hobirk, J. ; Johnson, T. ; Lönnroth, J. ; Salmi, Antti ; Tala, Tuomas ; Yavorskij, V. ; Zastrow, K.-D. ; JET-EFDA Contributors. / Effect of toroidal field ripple on the formation of internal transport barriers. In: Plasma Physics and Controlled Fusion. 2008 ; Vol. 50, No. 6.
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abstract = "The effect of a toroidal field (TF) ripple on the formation and performance of internal transport barriers (ITBs) has been studied in JET. It was found that the TF ripple had a profound effect on the toroidal plasma rotation. An increased TF ripple up to δ = 1{\%} led to a lower rotation and reduced the rotational shear in the region where the ITBs were formed. ITB triggering events were observed in all cases and it is thought that the rotational shear may be less important for this process than, for example, the q-profile. However, the increase in the pressure gradient following the ITB trigger was reduced in discharges with a larger TF ripple and consequently a lower rotational shear. This suggests that toroidal rotation and its shear play a role in the growth of the ITB once it has been triggered.",
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de Vries, PC, Joffrin, E, Hawkes, NC, Litaudon, X, Challis, CD, Andrew, Y, Beurskens, M, Brix, M, Brzozowski, J, Crombe, K, Giroud, C, Hobirk, J, Johnson, T, Lönnroth, J, Salmi, A, Tala, T, Yavorskij, V, Zastrow, K-D & JET-EFDA Contributors 2008, 'Effect of toroidal field ripple on the formation of internal transport barriers', Plasma Physics and Controlled Fusion, vol. 50, no. 6, 065008. https://doi.org/10.1088/0741-3335/50/6/065008

Effect of toroidal field ripple on the formation of internal transport barriers. / de Vries, P. C. (Corresponding Author); Joffrin, E.; Hawkes, N. C.; Litaudon, X.; Challis, C. D.; Andrew, Y.; Beurskens, M.; Brix, M.; Brzozowski, J,; Crombe, K.; Giroud, C.; Hobirk, J.; Johnson, T.; Lönnroth, J.; Salmi, Antti; Tala, Tuomas; Yavorskij, V.; Zastrow, K.-D.; JET-EFDA Contributors.

In: Plasma Physics and Controlled Fusion, Vol. 50, No. 6, 065008, 2008.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Effect of toroidal field ripple on the formation of internal transport barriers

AU - de Vries, P. C.

AU - Joffrin, E.

AU - Hawkes, N. C.

AU - Litaudon, X.

AU - Challis, C. D.

AU - Andrew, Y.

AU - Beurskens, M.

AU - Brix, M.

AU - Brzozowski, J,

AU - Crombe, K.

AU - Giroud, C.

AU - Hobirk, J.

AU - Johnson, T.

AU - Lönnroth, J.

AU - Salmi, Antti

AU - Tala, Tuomas

AU - Yavorskij, V.

AU - Zastrow, K.-D.

AU - JET-EFDA Contributors,

PY - 2008

Y1 - 2008

N2 - The effect of a toroidal field (TF) ripple on the formation and performance of internal transport barriers (ITBs) has been studied in JET. It was found that the TF ripple had a profound effect on the toroidal plasma rotation. An increased TF ripple up to δ = 1% led to a lower rotation and reduced the rotational shear in the region where the ITBs were formed. ITB triggering events were observed in all cases and it is thought that the rotational shear may be less important for this process than, for example, the q-profile. However, the increase in the pressure gradient following the ITB trigger was reduced in discharges with a larger TF ripple and consequently a lower rotational shear. This suggests that toroidal rotation and its shear play a role in the growth of the ITB once it has been triggered.

AB - The effect of a toroidal field (TF) ripple on the formation and performance of internal transport barriers (ITBs) has been studied in JET. It was found that the TF ripple had a profound effect on the toroidal plasma rotation. An increased TF ripple up to δ = 1% led to a lower rotation and reduced the rotational shear in the region where the ITBs were formed. ITB triggering events were observed in all cases and it is thought that the rotational shear may be less important for this process than, for example, the q-profile. However, the increase in the pressure gradient following the ITB trigger was reduced in discharges with a larger TF ripple and consequently a lower rotational shear. This suggests that toroidal rotation and its shear play a role in the growth of the ITB once it has been triggered.

U2 - 10.1088/0741-3335/50/6/065008

DO - 10.1088/0741-3335/50/6/065008

M3 - Article

VL - 50

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

SN - 0741-3335

IS - 6

M1 - 065008

ER -