Ion heat transport studies in JET

JET-EFDA collaborators

Research output: Contribution to journalArticleScientificpeer-review

19 Citations (Scopus)

Abstract

Detailed experimental studies of ion heat transport have been carried out in JET exploiting the upgrade of active charge exchange spectroscopy and the availability of multi-frequency ion cyclotron resonance heating with 3He minority. The determination of ion temperature gradient (ITG) threshold and ion stiffness offers unique opportunities for validation of the well-established theory of ITG driven modes. Ion stiffness is observed to decrease strongly in the presence of toroidal rotation when the magnetic shear is sufficiently low. This effect is dominant with respect to the well-known ω E×B threshold up-shift and plays a major role in enhancing core confinement in hybrid regimes and ion internal transport barriers. The effects of T e/T i and s/q on ion threshold are found rather weak in the domain explored. Quasi-linear fluid/gyro-fluid and linear/non-linear gyro-kinetic simulations have been carried out. Whilst threshold predictions show good match with experimental observations, some significant discrepancies are found on the stiffness behaviour.

Original languageEnglish
Article number124033
Number of pages17
JournalPlasma Physics and Controlled Fusion
Volume53
Issue number12
DOIs
Publication statusPublished - 1 Dec 2011
MoE publication typeNot Eligible
Event38th EPS Conference on Plasma Physics - Strasbourg, France
Duration: 27 Jun 20111 Jul 2011

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heat
Ions
stiffness
ions
thresholds
ion temperature
temperature gradients
Stiffness
Thermal gradients
fluids
minorities
cyclotron resonance
charge exchange
Cyclotron resonance
Fluids
availability
Hot Temperature
shear
Ion exchange
heating

Cite this

JET-EFDA collaborators. / Ion heat transport studies in JET. In: Plasma Physics and Controlled Fusion. 2011 ; Vol. 53, No. 12.
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title = "Ion heat transport studies in JET",
abstract = "Detailed experimental studies of ion heat transport have been carried out in JET exploiting the upgrade of active charge exchange spectroscopy and the availability of multi-frequency ion cyclotron resonance heating with 3He minority. The determination of ion temperature gradient (ITG) threshold and ion stiffness offers unique opportunities for validation of the well-established theory of ITG driven modes. Ion stiffness is observed to decrease strongly in the presence of toroidal rotation when the magnetic shear is sufficiently low. This effect is dominant with respect to the well-known ω E×B threshold up-shift and plays a major role in enhancing core confinement in hybrid regimes and ion internal transport barriers. The effects of T e/T i and s/q on ion threshold are found rather weak in the domain explored. Quasi-linear fluid/gyro-fluid and linear/non-linear gyro-kinetic simulations have been carried out. Whilst threshold predictions show good match with experimental observations, some significant discrepancies are found on the stiffness behaviour.",
author = "P. Mantica and C. Angioni and B. Baiocchi and M. Baruzzo and M. Beurskens and J.P.S. Bizarro and R. Budny and P. Buratti and A. Casati and C. Challis and J. Citrin and G. Colyer and F. Crisanti and A. Figueiredo and L. Frassinetti and C. Giroud and Hawkes, {N. C.} and J. Hobirk and E. Joffrin and T. Johnson and E. Lerche and P. Migliano and V. Naulin and Peeters, {A. G.} and G. Rewoldt and F. Ryter and Antti Salmi and R. Sartori and C. Sozzi and G. Staebler and D. Strintzi and Tuomas Tala and M. Tsalas and {Van Eester}, D. and T. Versloot and P.C. Devries and J. Weiland and {JET-EFDA collaborators}",
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Ion heat transport studies in JET. / JET-EFDA collaborators.

In: Plasma Physics and Controlled Fusion, Vol. 53, No. 12, 124033, 01.12.2011.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Ion heat transport studies in JET

AU - Mantica, P.

AU - Angioni, C.

AU - Baiocchi, B.

AU - Baruzzo, M.

AU - Beurskens, M.

AU - Bizarro, J.P.S.

AU - Budny, R.

AU - Buratti, P.

AU - Casati, A.

AU - Challis, C.

AU - Citrin, J.

AU - Colyer, G.

AU - Crisanti, F.

AU - Figueiredo, A.

AU - Frassinetti, L.

AU - Giroud, C.

AU - Hawkes, N. C.

AU - Hobirk, J.

AU - Joffrin, E.

AU - Johnson, T.

AU - Lerche, E.

AU - Migliano, P.

AU - Naulin, V.

AU - Peeters, A. G.

AU - Rewoldt, G.

AU - Ryter, F.

AU - Salmi, Antti

AU - Sartori, R.

AU - Sozzi, C.

AU - Staebler, G.

AU - Strintzi, D.

AU - Tala, Tuomas

AU - Tsalas, M.

AU - Van Eester, D.

AU - Versloot, T.

AU - Devries, P.C.

AU - Weiland, J.

AU - JET-EFDA collaborators

PY - 2011/12/1

Y1 - 2011/12/1

N2 - Detailed experimental studies of ion heat transport have been carried out in JET exploiting the upgrade of active charge exchange spectroscopy and the availability of multi-frequency ion cyclotron resonance heating with 3He minority. The determination of ion temperature gradient (ITG) threshold and ion stiffness offers unique opportunities for validation of the well-established theory of ITG driven modes. Ion stiffness is observed to decrease strongly in the presence of toroidal rotation when the magnetic shear is sufficiently low. This effect is dominant with respect to the well-known ω E×B threshold up-shift and plays a major role in enhancing core confinement in hybrid regimes and ion internal transport barriers. The effects of T e/T i and s/q on ion threshold are found rather weak in the domain explored. Quasi-linear fluid/gyro-fluid and linear/non-linear gyro-kinetic simulations have been carried out. Whilst threshold predictions show good match with experimental observations, some significant discrepancies are found on the stiffness behaviour.

AB - Detailed experimental studies of ion heat transport have been carried out in JET exploiting the upgrade of active charge exchange spectroscopy and the availability of multi-frequency ion cyclotron resonance heating with 3He minority. The determination of ion temperature gradient (ITG) threshold and ion stiffness offers unique opportunities for validation of the well-established theory of ITG driven modes. Ion stiffness is observed to decrease strongly in the presence of toroidal rotation when the magnetic shear is sufficiently low. This effect is dominant with respect to the well-known ω E×B threshold up-shift and plays a major role in enhancing core confinement in hybrid regimes and ion internal transport barriers. The effects of T e/T i and s/q on ion threshold are found rather weak in the domain explored. Quasi-linear fluid/gyro-fluid and linear/non-linear gyro-kinetic simulations have been carried out. Whilst threshold predictions show good match with experimental observations, some significant discrepancies are found on the stiffness behaviour.

U2 - 10.1088/0741-3335/53/12/124033

DO - 10.1088/0741-3335/53/12/124033

M3 - Article

VL - 53

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

SN - 0741-3335

IS - 12

M1 - 124033

ER -