Start Over

Plasma rotation and momentum transport studies at JET

Authors :: de Vries P. C.
Rantamäki K. M.
Giroud C.
Asp E.
Corrigan G.
Eriksson A.
de Greef M.
Jenkins I.
Knoops H. C. M.
Mantica P.
Nordman H.
Strand P.
Tala T.
Weiland J.
Zastrow K-D.
JET EFDA Contributors
Mechanical Engineering
Applied Physics and Science Education
Atomic scale processing
Source :: Plasma physics and controlled fusion, 48 (2006): 1693–1708. doi:10.1088/0741-3335/48/12/001, info:cnr-pdr/source/autori:de Vries P. C.; Rantamäki K. M.; Giroud C.; Asp E.; Corrigan G.; Eriksson A.; de Greef M.; Jenkins I.; Knoops H. C. M.; Mantica P.; Nordman H.; Strand P.; Tala T.; Weiland J.; Zastrow K-D.; and JET EFDA Contributors/titolo:Plasma rotation and momentum transport studies at JET/doi:10.1088%2F0741-3335%2F48%2F12%2F001/rivista:Plasma physics and controlled fusion (Print)/anno:2006/pagina_da:1693/pagina_a:1708/intervallo_pagine:1693–1708/volume:48, Plasma Physics and Controlled Fusion, 48(12):001, 1693-1708. Institute of Physics, de Vries, P C, Rantamäki, K M, Asp, E, Corrigan, G, Eriksson, A, Giroud, C, Knoops, H C M, Mantica, P, Nordman, H, Strand, P, Tala, T, Weiland, J, Zastrow, K-D & JET-EFDA Contributors 2006, ' Plasma rotation and momentum transport studies at JET ', Plasma Physics and Controlled Fusion, vol. 48, no. 12, pp. 1693-1708 . https://doi.org/10.1088/0741-3335/48/12/001
Publication Year :: 2006
Publisher :: IOP Publishing, 2006.
Abstract: An experimental study in plasma rotation and momentum transport was carried out at JET. The toroidal rotation profile was found to scale approximately with that of the ion temperature. However, significant deviations from this were found in high density ELMy H-mode discharges, which had broader rotation profiles. A rotation database analysis showed the variation of the dimensionless Mach number with respect to the plasma scenario. For predominantly NBI heated discharges the Mach number was found to be in the range of 0.3–0.45. Larger Mach numbers were observed in type I ELMy H-modes, while scenarios exhibiting type III ELMs or L-mode had lower Mach numbers. Advanced scenarios often showed a significant increase in the central Mach number when an internal transport barrier formed. A detailed study was done to investigate the Prandtl number, P r , defined as the ratio between momentum and ion heat diffusivity. Generally the Prandtl number was found to be significantly below unity, e.g. 0.18 < P r < 0.35. Although it is often predicted that momentum and heat diffusivity are equal in ITG dominated plasma, also for high density ELMy H-mode discharges with temperature profiles close and above the ITG threshold, the Prandtl number was P r ∼ 0.3.