Internal transport barrier triggering by rational magnetic flux surfaces in tokamaks

E. Joffrin; C.D. Challis; G.D. Conway; X. Garbet; A. Gude; S. Günter; N.C. Hawkes; T.C. Hender; D.F. Howell; G.T.A. Huysmans; E. Lazzaro; P. Maget; M. Marachek; A.G. Peeters; S.D. Pinches; S.E. Sharapov; JET-EFDA contributors

doi:10.1088/0029-5515/43/10/018

Internal transport barrier triggering by rational magnetic flux surfaces in tokamaks

E. Joffrin, C.D. Challis, G.D. Conway, X. Garbet, A. Gude, S. Günter, N.C. Hawkes, T.C. Hender, D.F. Howell, G.T.A. Huysmans, E. Lazzaro, P. Maget, M. Marachek, A.G. Peeters, S.D. Pinches, S.E. Sharapov, JET-EFDA contributors

Onderzoeksoutput: Bijdrage aan tijdschrift › Tijdschriftartikel › Academic › peer review

141 Citaten (Scopus)

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The formation of internal transport barriers (ITBs) has been experimentally associated with the presence of rational q surfaces in both JET and ASDEX Upgrade. The triggering mechanisms are related to the occurrence of magneto-hydrodynamic (MHD) instabilities such as mode coupling and fishbone activity. These events could locally modify the poloidal velocity and increase transiently the shearing rate to values comparable with the linear growth rate of ion temperature gradient modes. For JET reversed magnetic shear scenarios, ITB emergence occurs preferentially when the minimum q reaches an integral value. In this case, transport effects localized in the vicinity of zero magnetic shear and close to rational q values may be at the origin of ITB formation. The role of rational q surfaces in ITB triggering stresses the importance of q profile control for an advanced tokamak scenario and could assist in substantially lowering the access power to these scenarios in next step facilities.

Originele taal-2	Engels
Pagina's (van-tot)	1167-1174
Tijdschrift	Nuclear Fusion
Volume	43
Nummer van het tijdschrift	10
DOI's	https://doi.org/10.1088/0029-5515/43/10/018
Status	Gepubliceerd - 1 okt. 2003
Extern gepubliceerd	Ja

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10.1088/0029-5515/43/10/018

http://adsabs.harvard.edu/abs/2003NucFu..43.1167J

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Joffrin, E., Challis, C. D., Conway, G. D., Garbet, X., Gude, A., Günter, S., Hawkes, N. C., Hender, T. C., Howell, D. F., Huysmans, G. T. A., Lazzaro, E., Maget, P., Marachek, M., Peeters, A. G., Pinches, S. D., Sharapov, S. E., & contributors, JET.-EFDA. (2003). Internal transport barrier triggering by rational magnetic flux surfaces in tokamaks. Nuclear Fusion, 43(10), 1167-1174. https://doi.org/10.1088/0029-5515/43/10/018

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title = "Internal transport barrier triggering by rational magnetic flux surfaces in tokamaks",

abstract = "The formation of internal transport barriers (ITBs) has been experimentally associated with the presence of rational q surfaces in both JET and ASDEX Upgrade. The triggering mechanisms are related to the occurrence of magneto-hydrodynamic (MHD) instabilities such as mode coupling and fishbone activity. These events could locally modify the poloidal velocity and increase transiently the shearing rate to values comparable with the linear growth rate of ion temperature gradient modes. For JET reversed magnetic shear scenarios, ITB emergence occurs preferentially when the minimum q reaches an integral value. In this case, transport effects localized in the vicinity of zero magnetic shear and close to rational q values may be at the origin of ITB formation. The role of rational q surfaces in ITB triggering stresses the importance of q profile control for an advanced tokamak scenario and could assist in substantially lowering the access power to these scenarios in next step facilities.",

author = "E. Joffrin and C.D. Challis and G.D. Conway and X. Garbet and A. Gude and S. G{\"u}nter and N.C. Hawkes and T.C. Hender and D.F. Howell and G.T.A. Huysmans and E. Lazzaro and P. Maget and M. Marachek and A.G. Peeters and S.D. Pinches and S.E. Sharapov and JET-EFDA contributors",

year = "2003",

month = oct,

day = "1",

doi = "10.1088/0029-5515/43/10/018",

language = "English",

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Joffrin, E, Challis, CD, Conway, GD, Garbet, X, Gude, A, Günter, S, Hawkes, NC, Hender, TC, Howell, DF, Huysmans, GTA, Lazzaro, E, Maget, P, Marachek, M, Peeters, AG, Pinches, SD, Sharapov, SE & contributors, JET-EFDA 2003, 'Internal transport barrier triggering by rational magnetic flux surfaces in tokamaks', Nuclear Fusion, vol. 43, nr. 10, blz. 1167-1174. https://doi.org/10.1088/0029-5515/43/10/018

TY - JOUR

T1 - Internal transport barrier triggering by rational magnetic flux surfaces in tokamaks

AU - Joffrin, E.

AU - Challis, C.D.

AU - Conway, G.D.

AU - Garbet, X.

AU - Gude, A.

AU - Günter, S.

AU - Hawkes, N.C.

AU - Hender, T.C.

AU - Howell, D.F.

AU - Huysmans, G.T.A.

AU - Lazzaro, E.

AU - Maget, P.

AU - Marachek, M.

AU - Peeters, A.G.

AU - Pinches, S.D.

AU - Sharapov, S.E.

AU - contributors, JET-EFDA

PY - 2003/10/1

Y1 - 2003/10/1

N2 - The formation of internal transport barriers (ITBs) has been experimentally associated with the presence of rational q surfaces in both JET and ASDEX Upgrade. The triggering mechanisms are related to the occurrence of magneto-hydrodynamic (MHD) instabilities such as mode coupling and fishbone activity. These events could locally modify the poloidal velocity and increase transiently the shearing rate to values comparable with the linear growth rate of ion temperature gradient modes. For JET reversed magnetic shear scenarios, ITB emergence occurs preferentially when the minimum q reaches an integral value. In this case, transport effects localized in the vicinity of zero magnetic shear and close to rational q values may be at the origin of ITB formation. The role of rational q surfaces in ITB triggering stresses the importance of q profile control for an advanced tokamak scenario and could assist in substantially lowering the access power to these scenarios in next step facilities.

AB - The formation of internal transport barriers (ITBs) has been experimentally associated with the presence of rational q surfaces in both JET and ASDEX Upgrade. The triggering mechanisms are related to the occurrence of magneto-hydrodynamic (MHD) instabilities such as mode coupling and fishbone activity. These events could locally modify the poloidal velocity and increase transiently the shearing rate to values comparable with the linear growth rate of ion temperature gradient modes. For JET reversed magnetic shear scenarios, ITB emergence occurs preferentially when the minimum q reaches an integral value. In this case, transport effects localized in the vicinity of zero magnetic shear and close to rational q values may be at the origin of ITB formation. The role of rational q surfaces in ITB triggering stresses the importance of q profile control for an advanced tokamak scenario and could assist in substantially lowering the access power to these scenarios in next step facilities.

U2 - 10.1088/0029-5515/43/10/018

DO - 10.1088/0029-5515/43/10/018

M3 - Article

SN - 0029-5515

VL - 43

SP - 1167

EP - 1174

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 10

ER -

Internal transport barrier triggering by rational magnetic flux surfaces in tokamaks

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