Gyrokinetic simulation of transport reduction by pellet injection in TUMAN-3M tokamak

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Gyrokinetic simulation of transport reduction by pellet injection in TUMAN-3M tokamak. / Kiviniemi, T. P.; Niskala, P.; Askinazi, L. G.; Belokurov, A. A.; Chone, L.; Gurchenko, A. D.; Gusakov, E. Z.; Korpilo, T.; Lebedev, S. V.; Leerink, S.; Rochford, R.; Tukachinsky, A. S.

In: Plasma Physics and Controlled Fusion, Vol. 60, No. 8, 085010, 08.2018.

Research output: Contribution to journalArticleScientificpeer-review

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Kiviniemi, TP, Niskala, P, Askinazi, LG, Belokurov, AA, Chone, L, Gurchenko, AD, Gusakov, EZ, Korpilo, T, Lebedev, SV, Leerink, S, Rochford, R & Tukachinsky, AS 2018, 'Gyrokinetic simulation of transport reduction by pellet injection in TUMAN-3M tokamak', Plasma Physics and Controlled Fusion, vol. 60, no. 8, 085010. https://doi.org/10.1088/1361-6587/aac917

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Kiviniemi, T. P. ; Niskala, P. ; Askinazi, L. G. ; Belokurov, A. A. ; Chone, L. ; Gurchenko, A. D. ; Gusakov, E. Z. ; Korpilo, T. ; Lebedev, S. V. ; Leerink, S. ; Rochford, R. ; Tukachinsky, A. S. / Gyrokinetic simulation of transport reduction by pellet injection in TUMAN-3M tokamak. In: Plasma Physics and Controlled Fusion. 2018 ; Vol. 60, No. 8.

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@article{e41a538016a4499cab120e9e1ebb7edb,
title = "Gyrokinetic simulation of transport reduction by pellet injection in TUMAN-3M tokamak",
abstract = "We apply gyrokinetic simulations to study pellet induced improved confinement in the TUMAN-3M tokamak. Nonlinear simulations show a clear decrease in transport coefficients due to the pellet injection in qualitative agreement with experimental observations. Neoclassical theory predicts a very steep flow profile in the edge plasma, when the pellet injection changes the collisionality regime from Plateau to Pfirsch-Schluter regime, whereas the simulations predict a gentler flow profile even when the turbulence is neglected. Simulations also show a modest effect of the pellet on the E x B shearing rate. Instead of flow shear, the suppression of transport is thus caused by pellet induced changes in the plasma profiles and especially collisionality. The substantial impact of collisionality on linear growth rates is clearly observed in linear gyrokinetic simulations.",
keywords = "turbulence, confinement, transport, pellet, neoclassical, RADIAL ELECTRIC-FIELD, H-MODE, PLASMAS, BARRIER",
author = "Kiviniemi, {T. P.} and P. Niskala and Askinazi, {L. G.} and Belokurov, {A. A.} and L. Chone and Gurchenko, {A. D.} and Gusakov, {E. Z.} and T. Korpilo and Lebedev, {S. V.} and S. Leerink and R. Rochford and Tukachinsky, {A. S.}",
year = "2018",
month = "8",
doi = "10.1088/1361-6587/aac917",
language = "English",
volume = "60",
journal = "Plasma Physics and Controlled Fusion",
issn = "0741-3335",
number = "8",

}

RIS - Download

TY - JOUR

T1 - Gyrokinetic simulation of transport reduction by pellet injection in TUMAN-3M tokamak

AU - Kiviniemi, T. P.

AU - Niskala, P.

AU - Askinazi, L. G.

AU - Belokurov, A. A.

AU - Chone, L.

AU - Gurchenko, A. D.

AU - Gusakov, E. Z.

AU - Korpilo, T.

AU - Lebedev, S. V.

AU - Leerink, S.

AU - Rochford, R.

AU - Tukachinsky, A. S.

PY - 2018/8

Y1 - 2018/8

N2 - We apply gyrokinetic simulations to study pellet induced improved confinement in the TUMAN-3M tokamak. Nonlinear simulations show a clear decrease in transport coefficients due to the pellet injection in qualitative agreement with experimental observations. Neoclassical theory predicts a very steep flow profile in the edge plasma, when the pellet injection changes the collisionality regime from Plateau to Pfirsch-Schluter regime, whereas the simulations predict a gentler flow profile even when the turbulence is neglected. Simulations also show a modest effect of the pellet on the E x B shearing rate. Instead of flow shear, the suppression of transport is thus caused by pellet induced changes in the plasma profiles and especially collisionality. The substantial impact of collisionality on linear growth rates is clearly observed in linear gyrokinetic simulations.

AB - We apply gyrokinetic simulations to study pellet induced improved confinement in the TUMAN-3M tokamak. Nonlinear simulations show a clear decrease in transport coefficients due to the pellet injection in qualitative agreement with experimental observations. Neoclassical theory predicts a very steep flow profile in the edge plasma, when the pellet injection changes the collisionality regime from Plateau to Pfirsch-Schluter regime, whereas the simulations predict a gentler flow profile even when the turbulence is neglected. Simulations also show a modest effect of the pellet on the E x B shearing rate. Instead of flow shear, the suppression of transport is thus caused by pellet induced changes in the plasma profiles and especially collisionality. The substantial impact of collisionality on linear growth rates is clearly observed in linear gyrokinetic simulations.

KW - turbulence

KW - confinement

KW - transport

KW - pellet

KW - neoclassical

KW - RADIAL ELECTRIC-FIELD

KW - H-MODE

KW - PLASMAS

KW - BARRIER

U2 - 10.1088/1361-6587/aac917

DO - 10.1088/1361-6587/aac917

M3 - Article

VL - 60

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

SN - 0741-3335

IS - 8

M1 - 085010

ER -

ID: 27448808