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

T. P. Kiviniemi; P. Niskala; L. G. Askinazi; A. A. Belokurov; L. Chone; A. D. Gurchenko; E. Z. Gusakov; T. Korpilo; S. V. Lebedev; S. Leerink; R. Rochford; A. S. Tukachinsky

doi:10.1088/1361-6587/aac917

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

T. P. Kiviniemi^*, P. Niskala, L. G. Askinazi, A. A. Belokurov, L. Chone, A. D. Gurchenko, E. Z. Gusakov, T. Korpilo, S. V. Lebedev, S. Leerink, R. Rochford, A. S. Tukachinsky

^*Corresponding author for this work

Ioffe Institute

Research output: Contribution to journal › Article › Scientific › peer-review

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.

Original language	English
Article number	085010
Number of pages	10
Journal	Plasma Physics and Controlled Fusion
Volume	60
Issue number	8
DOIs	https://doi.org/10.1088/1361-6587/aac917
Publication status	Published - Aug 2018
MoE publication type	A1 Journal article-refereed

Funding

The work has been supported by Ioffe Institute, the Academy of Finland (grants 278487 and 296853) and Russian Federation state funding assignment 0040-2014-0023. CSC IT Center for Science, PRACE and EUROfusion High Performance Computer (Marconi-Fusion) are acknowledged for allocation of computational resources for this work. Financial support of the Russian Science Foundation grant 17-12-01110 is acknowledged by A Gurchenko and E Gusakov.

Keywords

turbulence
confinement
transport
pellet
neoclassical
RADIAL ELECTRIC-FIELD
H-MODE
PLASMAS
BARRIER

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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. (2018). Gyrokinetic simulation of transport reduction by pellet injection in TUMAN-3M tokamak. Plasma Physics and Controlled Fusion, 60(8), Article 085010. https://doi.org/10.1088/1361-6587/aac917

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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 = aug,

doi = "10.1088/1361-6587/aac917",

language = "English",

volume = "60",

journal = "Plasma Physics and Controlled Fusion",

issn = "0741-3335",

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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

SN - 0741-3335

VL - 60

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 8

M1 - 085010

ER -

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

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