Monte Carlo guiding centre simulations of E x B  flow shear in edge transport barrier

T. Kiviniemi, Jukka Heikkinen, A. Peeters, S. Sipilä

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)

Abstract

Er×B flow shear is simulated with a fully kinetic five-dimensional neoclassical Monte Carlo simulation both for JET and ASDEX Upgrade. Here, Er is the radial electric field and B is the magnetic field. It is shown that high enough shear for turbulence suppression can be driven at low (L) to high (H) transition conditions without taking into account anomalous processes in Er shear formation. For typical plasma parameters, at a certain edge temperature, shear is weaker in JET than in ASDEX Upgrade, thus requiring a higher edge temperature for L-H transition as observed also in experiments. However, although the simulation is carried out at experimentally observed L-H transition temperatures of each device, shear is still weaker in JET, which proposes that the critical shear in JET should be lower than in ASDEX Upgrade. The parametric dependence of the shear on temperature, density and magnetic field is investigated and the effects of density and temperature gradients, plasma current and the direction of the ∇B drift on the shear are discussed.
Original languageEnglish
Pages (from-to)1103-1118
Number of pages16
JournalPlasma Physics and Controlled Fusion
Volume43
Issue number8
DOIs
Publication statusPublished - 2001
MoE publication typeA1 Journal article-refereed

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Shear flow
shear flow
shear
Magnetic fields
Plasmas
simulation
Thermal gradients
Temperature
Superconducting transition temperature
Turbulence
Electric fields
Kinetics
plasma currents
magnetic fields
Experiments
temperature gradients
temperature distribution
turbulence
transition temperature
retarding

Cite this

Kiviniemi, T. ; Heikkinen, Jukka ; Peeters, A. ; Sipilä, S. / Monte Carlo guiding centre simulations of E x B  flow shear in edge transport barrier. In: Plasma Physics and Controlled Fusion. 2001 ; Vol. 43, No. 8. pp. 1103-1118.
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abstract = "Er×B flow shear is simulated with a fully kinetic five-dimensional neoclassical Monte Carlo simulation both for JET and ASDEX Upgrade. Here, Er is the radial electric field and B is the magnetic field. It is shown that high enough shear for turbulence suppression can be driven at low (L) to high (H) transition conditions without taking into account anomalous processes in Er shear formation. For typical plasma parameters, at a certain edge temperature, shear is weaker in JET than in ASDEX Upgrade, thus requiring a higher edge temperature for L-H transition as observed also in experiments. However, although the simulation is carried out at experimentally observed L-H transition temperatures of each device, shear is still weaker in JET, which proposes that the critical shear in JET should be lower than in ASDEX Upgrade. The parametric dependence of the shear on temperature, density and magnetic field is investigated and the effects of density and temperature gradients, plasma current and the direction of the ∇B drift on the shear are discussed.",
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Monte Carlo guiding centre simulations of E x B  flow shear in edge transport barrier. / Kiviniemi, T.; Heikkinen, Jukka; Peeters, A.; Sipilä, S.

In: Plasma Physics and Controlled Fusion, Vol. 43, No. 8, 2001, p. 1103-1118.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Monte Carlo guiding centre simulations of E x B  flow shear in edge transport barrier

AU - Kiviniemi, T.

AU - Heikkinen, Jukka

AU - Peeters, A.

AU - Sipilä, S.

PY - 2001

Y1 - 2001

N2 - Er×B flow shear is simulated with a fully kinetic five-dimensional neoclassical Monte Carlo simulation both for JET and ASDEX Upgrade. Here, Er is the radial electric field and B is the magnetic field. It is shown that high enough shear for turbulence suppression can be driven at low (L) to high (H) transition conditions without taking into account anomalous processes in Er shear formation. For typical plasma parameters, at a certain edge temperature, shear is weaker in JET than in ASDEX Upgrade, thus requiring a higher edge temperature for L-H transition as observed also in experiments. However, although the simulation is carried out at experimentally observed L-H transition temperatures of each device, shear is still weaker in JET, which proposes that the critical shear in JET should be lower than in ASDEX Upgrade. The parametric dependence of the shear on temperature, density and magnetic field is investigated and the effects of density and temperature gradients, plasma current and the direction of the ∇B drift on the shear are discussed.

AB - Er×B flow shear is simulated with a fully kinetic five-dimensional neoclassical Monte Carlo simulation both for JET and ASDEX Upgrade. Here, Er is the radial electric field and B is the magnetic field. It is shown that high enough shear for turbulence suppression can be driven at low (L) to high (H) transition conditions without taking into account anomalous processes in Er shear formation. For typical plasma parameters, at a certain edge temperature, shear is weaker in JET than in ASDEX Upgrade, thus requiring a higher edge temperature for L-H transition as observed also in experiments. However, although the simulation is carried out at experimentally observed L-H transition temperatures of each device, shear is still weaker in JET, which proposes that the critical shear in JET should be lower than in ASDEX Upgrade. The parametric dependence of the shear on temperature, density and magnetic field is investigated and the effects of density and temperature gradients, plasma current and the direction of the ∇B drift on the shear are discussed.

U2 - 10.1088/0741-3335/43/8/305

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SN - 0741-3335

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