Internal transport barrier dynamics with plasma rotation in JET

P.C. de Vries, E. Joffrin, M. Brix, C.D. Challis, K. Crombé, B, Esposito, N.C. Hawkes, C. Giroud, J. Hobirk, J. Lönnroth, P. Mantica, D. Strintzi, Tuomas Tala, I. Voitsekhovitch, JET-EFDA Contributores

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Abstract

At JET the dynamics of internal transport barriers (ITBs) has been explored by trying to decouple the effects of heating on the one hand and torque on the other with the ultimate objective of identifying the minimum torque required for the formation of transport barriers. The experiments shed light on the physics behind the initial trigger for ITBs, which often shows to be linked to the shape of the q profile and magnetic shear, while the further development was influenced by the strength of the rotational shear. In discharges with a small amount of rotational shear ITBs were triggered, which suggest that the overall rotational shear is not the dominant factor in the triggering process. However, the subsequent growth of the barrier was limited if the rotational shear was too low at the time of triggering. This growth phase may be highly non-linear, with several possible positive feedback loops, such as the increases in the toroidal and poloidal component of the rotational shear caused by the ITB itself.
Original languageEnglish
Article number075007
JournalNuclear Fusion
Volume49
Issue number7
DOIs
Publication statusPublished - 2009
MoE publication typeA1 Journal article-refereed

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shear
torque
positive feedback
actuators
physics
heating
profiles

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de Vries, P. C., Joffrin, E., Brix, M., Challis, C. D., Crombé, K., Esposito, B., ... Contributores, JET-EFDA. (2009). Internal transport barrier dynamics with plasma rotation in JET. Nuclear Fusion, 49(7), [075007]. https://doi.org/10.1088/0029-5515/49/7/075007
de Vries, P.C. ; Joffrin, E. ; Brix, M. ; Challis, C.D. ; Crombé, K. ; Esposito, B, ; Hawkes, N.C. ; Giroud, C. ; Hobirk, J. ; Lönnroth, J. ; Mantica, P. ; Strintzi, D. ; Tala, Tuomas ; Voitsekhovitch, I. ; Contributores, JET-EFDA. / Internal transport barrier dynamics with plasma rotation in JET. In: Nuclear Fusion. 2009 ; Vol. 49, No. 7.
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title = "Internal transport barrier dynamics with plasma rotation in JET",
abstract = "At JET the dynamics of internal transport barriers (ITBs) has been explored by trying to decouple the effects of heating on the one hand and torque on the other with the ultimate objective of identifying the minimum torque required for the formation of transport barriers. The experiments shed light on the physics behind the initial trigger for ITBs, which often shows to be linked to the shape of the q profile and magnetic shear, while the further development was influenced by the strength of the rotational shear. In discharges with a small amount of rotational shear ITBs were triggered, which suggest that the overall rotational shear is not the dominant factor in the triggering process. However, the subsequent growth of the barrier was limited if the rotational shear was too low at the time of triggering. This growth phase may be highly non-linear, with several possible positive feedback loops, such as the increases in the toroidal and poloidal component of the rotational shear caused by the ITB itself.",
author = "{de Vries}, P.C. and E. Joffrin and M. Brix and C.D. Challis and K. Cromb{\'e} and B, Esposito and N.C. Hawkes and C. Giroud and J. Hobirk and J. L{\"o}nnroth and P. Mantica and D. Strintzi and Tuomas Tala and I. Voitsekhovitch and JET-EFDA Contributores",
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de Vries, PC, Joffrin, E, Brix, M, Challis, CD, Crombé, K, Esposito, B, Hawkes, NC, Giroud, C, Hobirk, J, Lönnroth, J, Mantica, P, Strintzi, D, Tala, T, Voitsekhovitch, I & Contributores, JET-EFDA 2009, 'Internal transport barrier dynamics with plasma rotation in JET', Nuclear Fusion, vol. 49, no. 7, 075007. https://doi.org/10.1088/0029-5515/49/7/075007

Internal transport barrier dynamics with plasma rotation in JET. / de Vries, P.C.; Joffrin, E.; Brix, M.; Challis, C.D.; Crombé, K.; Esposito, B,; Hawkes, N.C.; Giroud, C.; Hobirk, J.; Lönnroth, J.; Mantica, P.; Strintzi, D.; Tala, Tuomas; Voitsekhovitch, I.; Contributores, JET-EFDA.

In: Nuclear Fusion, Vol. 49, No. 7, 075007, 2009.

Research output: Contribution to journalArticleScientificpeer-review

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AU - de Vries, P.C.

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AU - Esposito, B,

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AU - Lönnroth, J.

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AB - At JET the dynamics of internal transport barriers (ITBs) has been explored by trying to decouple the effects of heating on the one hand and torque on the other with the ultimate objective of identifying the minimum torque required for the formation of transport barriers. The experiments shed light on the physics behind the initial trigger for ITBs, which often shows to be linked to the shape of the q profile and magnetic shear, while the further development was influenced by the strength of the rotational shear. In discharges with a small amount of rotational shear ITBs were triggered, which suggest that the overall rotational shear is not the dominant factor in the triggering process. However, the subsequent growth of the barrier was limited if the rotational shear was too low at the time of triggering. This growth phase may be highly non-linear, with several possible positive feedback loops, such as the increases in the toroidal and poloidal component of the rotational shear caused by the ITB itself.

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de Vries PC, Joffrin E, Brix M, Challis CD, Crombé K, Esposito B et al. Internal transport barrier dynamics with plasma rotation in JET. Nuclear Fusion. 2009;49(7). 075007. https://doi.org/10.1088/0029-5515/49/7/075007