Scaling of rotation and momentum confinement in JET plasmas

P. C. De Vries (Corresponding Author), M.-D. Hua, D. C. McDonald, C. Giroud, M. Janvier, M. F. Johnson, Tuomas Tala, K.-D. Zastrow, JET-EFDA Contributors

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

An extensive database to study the scaling of rotation and momentum transport has been constructed at JET. The database contains information from various operational scenarios, amongst them H-mode discharges, and parameters that characterize the rotation, as well as those that describe the general plasma conditions. JET plasmas are predominantly heated by neutral beam injection which is also the main source for the observed toroidal rotation. Dimensionless Mach numbers are introduced to quantify rotation. The scaling of plasma rotation and the Mach numbers in particular has been studied. The thermal and Alfvén Mach numbers were found to scale inversely with q and with the ratio of torque and additional heating power. Although the momentum and energy confinement times were found to be of the same magnitude, the ratio was found to vary. Regression analyses showed a dependence of both the energy and momentum confinement times on plasma rotation. If rotation was included in the scaling model of energy and momentum confinement the quality of the fits substantially improved. Detailed analysis of the core and edge (pedestal) confinement showed that momentum confinement was improved in the core of the plasma compared with the energy confinement. However, the pedestal proved to be less confining for the momentum than for the energy.
Original languageEnglish
JournalNuclear Fusion
Volume48
Issue number6
DOIs
Publication statusPublished - 2008
MoE publication typeA1 Journal article-refereed

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momentum
scaling
Mach number
energy
beam injection
neutral beams
confining
torque
regression analysis
heating

Cite this

De Vries, P. C., Hua, M-D., McDonald, D. C., Giroud, C., Janvier, M., Johnson, M. F., ... JET-EFDA Contributors (2008). Scaling of rotation and momentum confinement in JET plasmas. Nuclear Fusion, 48(6). https://doi.org/10.1088/0029-5515/48/6/065006
De Vries, P. C. ; Hua, M.-D. ; McDonald, D. C. ; Giroud, C. ; Janvier, M. ; Johnson, M. F. ; Tala, Tuomas ; Zastrow, K.-D. ; JET-EFDA Contributors. / Scaling of rotation and momentum confinement in JET plasmas. In: Nuclear Fusion. 2008 ; Vol. 48, No. 6.
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abstract = "An extensive database to study the scaling of rotation and momentum transport has been constructed at JET. The database contains information from various operational scenarios, amongst them H-mode discharges, and parameters that characterize the rotation, as well as those that describe the general plasma conditions. JET plasmas are predominantly heated by neutral beam injection which is also the main source for the observed toroidal rotation. Dimensionless Mach numbers are introduced to quantify rotation. The scaling of plasma rotation and the Mach numbers in particular has been studied. The thermal and Alfv{\'e}n Mach numbers were found to scale inversely with q and with the ratio of torque and additional heating power. Although the momentum and energy confinement times were found to be of the same magnitude, the ratio was found to vary. Regression analyses showed a dependence of both the energy and momentum confinement times on plasma rotation. If rotation was included in the scaling model of energy and momentum confinement the quality of the fits substantially improved. Detailed analysis of the core and edge (pedestal) confinement showed that momentum confinement was improved in the core of the plasma compared with the energy confinement. However, the pedestal proved to be less confining for the momentum than for the energy.",
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De Vries, PC, Hua, M-D, McDonald, DC, Giroud, C, Janvier, M, Johnson, MF, Tala, T, Zastrow, K-D & JET-EFDA Contributors 2008, 'Scaling of rotation and momentum confinement in JET plasmas', Nuclear Fusion, vol. 48, no. 6. https://doi.org/10.1088/0029-5515/48/6/065006

Scaling of rotation and momentum confinement in JET plasmas. / De Vries, P. C. (Corresponding Author); Hua, M.-D.; McDonald, D. C.; Giroud, C.; Janvier, M.; Johnson, M. F.; Tala, Tuomas; Zastrow, K.-D.; JET-EFDA Contributors.

In: Nuclear Fusion, Vol. 48, No. 6, 2008.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - Scaling of rotation and momentum confinement in JET plasmas

AU - De Vries, P. C.

AU - Hua, M.-D.

AU - McDonald, D. C.

AU - Giroud, C.

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AU - Johnson, M. F.

AU - Tala, Tuomas

AU - Zastrow, K.-D.

AU - JET-EFDA Contributors,

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AB - An extensive database to study the scaling of rotation and momentum transport has been constructed at JET. The database contains information from various operational scenarios, amongst them H-mode discharges, and parameters that characterize the rotation, as well as those that describe the general plasma conditions. JET plasmas are predominantly heated by neutral beam injection which is also the main source for the observed toroidal rotation. Dimensionless Mach numbers are introduced to quantify rotation. The scaling of plasma rotation and the Mach numbers in particular has been studied. The thermal and Alfvén Mach numbers were found to scale inversely with q and with the ratio of torque and additional heating power. Although the momentum and energy confinement times were found to be of the same magnitude, the ratio was found to vary. Regression analyses showed a dependence of both the energy and momentum confinement times on plasma rotation. If rotation was included in the scaling model of energy and momentum confinement the quality of the fits substantially improved. Detailed analysis of the core and edge (pedestal) confinement showed that momentum confinement was improved in the core of the plasma compared with the energy confinement. However, the pedestal proved to be less confining for the momentum than for the energy.

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De Vries PC, Hua M-D, McDonald DC, Giroud C, Janvier M, Johnson MF et al. Scaling of rotation and momentum confinement in JET plasmas. Nuclear Fusion. 2008;48(6). https://doi.org/10.1088/0029-5515/48/6/065006