Effect of the radial electric field on lower hybrid plasma heating in the FT-2 tokamak

Lashkul, S. I.; Budnikov, V.N.; Vekshina, E. O.; Dyachenko, V. V.; Ermolaev, V. B.; Esipov, L. A.; Its, E. R.; Kantor, M. Yu.; Kuprienko, D. V.; Popov, A. Yu.; Shatalin, S. V.

doi:10.1134/1.1426133

Cited by 15 publications

(19 citation statements)

References 10 publications

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“…The convergence issues and the validation of the code with respect to linear growth and frequency of the ion temperature gradient mode instabilities and benchmarks against turbulence saturation and neoclassical effects (where proper treatment of kinetic electrons is important) are given in Section 5. The developed code is applied for a global transport analysis in an FT-2 tokamak plasma (Fisichiskii Tokamak-2, Ioffe Institute, St Petersburg) [38] having lower hybrid (LH) ion heating. The transport coefficients and electrostatic field together with the density and temperature profiles are solved for the heated plasma and a qualitative comparison with some representative experimental data is presented in Section 6.…”

Section: Introductionmentioning

confidence: 99%

Full f gyrokinetic method for particle simulation of tokamak transport

Heikkinen

Janhunen

Kiviniemi

et al. 2008

Journal of Computational Physics

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Section: Introductionmentioning

confidence: 99%

Full f gyrokinetic method for particle simulation of tokamak transport

Heikkinen

Janhunen

Kiviniemi

et al. 2008

Journal of Computational Physics

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“…Circular cross-section with cocentric magnetic surfaces is assumed. For the initialization of the ions we adopt typical improved confinement plasma profiles measured in FT-2 [6] …”

Section: Tem and Itg Modes For Steep Background Gradientsmentioning

confidence: 99%

Full f particle simulation method for solution of transient edge phenomena

Heikkinen¹,

Janhunen²,

Kiviniemi³

et al. 2004

Contrib. Plasma Phys.

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PACS 52.65.TtAn electrostatic gyrokinetic guiding-centre particle code is described where electrons and ions are simultaneously followed in the edge region. Full f technique is used for particle sampling and loading to allow efficient treatment of strong time variation in the collisional edge bulk plasma. Both the gyrokinetic ion polarization term and the implicit electron term in the quasi-neutrality condition are determined based on the full-f sampling for both electrons and ions. Issues relevant for the SOL modeling like recycling, heat source, and boundary conditions for plasma/wall interaction are discussed.

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Section: Introductionmentioning

confidence: 99%

“…The main part of the previous papers is concerned with plasma under q = 6 (R=0.55m, a=0.079m, I pl = 22kA and B t = 2.2T, P LHH = 90÷100kW), where the effective LHH and improved confinement transition are realised [3]. The L-H transition with ETB has been observed after RF pulse end.…”

Section: Introductionmentioning

confidence: 99%

“…This paper present our observations and conclusions about development of the transport process at the plasma periphery of the small tokamak FT-2 during additional Lower Hybrid Heating (LHH), when external (ETB) transport barrier followed by Internal (ITB) transport barrier is observed [3,4].The main part of the previous papers is concerned with plasma under q = 6 (R=0.55m, a=0.079m, I pl = 22kA and B t = 2.2T, P LHH = 90÷100kW), where the effective LHH and improved confinement transition are realised [3]. The L-H transition with ETB has been observed after RF pulse end.…”

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confidence: 99%

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Poloidal inhomogenity of the particle fluctuation induced fluxes near the LCFS at lower hybrid heating and improved confinement transition at the FT-2 tokamak

et al. 2005

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IntroductionThe problem of the anomalous high periphery thermal transport at tokamak plasmas and mechanism of their suppression, when a transport barrier is formed has been discussed in a number of recent publications [1,2]. This paper present our observations and conclusions about development of the transport process at the plasma periphery of the small tokamak FT-2 during additional Lower Hybrid Heating (LHH), when external (ETB) transport barrier followed by Internal (ITB) transport barrier is observed [3,4].The main part of the previous papers is concerned with plasma under q = 6 (R=0.55m, a=0.079m, I pl = 22kA and B t = 2.2T, P LHH = 90÷100kW), where the effective LHH and improved confinement transition are realised [3]. The L-H transition with ETB has been observed after RF pulse end. The RF pulse (∆t LH = 5ms) is applied at the 30 th ms of a ∆t pl = 50ms plasma shot. During additional LHH the ITB is formed spontaneously a few ms after the RF pulse start. The essential gradient rise of the ion temperature profiles and its flattening in the core center during LHH indicates that ITB is formed at 32 -33 ms in the r = 5 cm region. The transport barrier formation can be confirmed by time history of the ion temperature variation obtained by CX analyser and spectral diagnostic using Doppler broadening of the CIII line radiation and density profile changes [4].It should be stressed that in our papers effective LH heating and spontaneous ITB formation have been explained through careful numerical Monte Carlo modelling [5]. One deduced that the high energy ions are well confined in the case, when poloidal Mach number M p = ≥ 1, which has been realised in FT-2 experiment with plasma under q = 6. It was found the radial electric field provides a spontaneous transition to high negative value, if the local Mach number is about one. This is partially due to rotational runaway due to negative inertia [6], and partially due to finite orbit effects [7].The L-H transition with ETB has been observed after RF pulse end. Distinction of the mechanism which can trigger L -H transition is discussed in this paper. The paper deals with the new microturbulence and spectral experimental data and their analysis, which show, that the radial electric field E r generated at the LH heating (LHH) in the FT-2 is high enough to form the transport barriers.

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Effect of the radial electric field on lower hybrid plasma heating in the FT-2 tokamak

Cited by 15 publications

References 10 publications

Full f gyrokinetic method for particle simulation of tokamak transport

Full f gyrokinetic method for particle simulation of tokamak transport

Full f particle simulation method for solution of transient edge phenomena

Poloidal inhomogenity of the particle fluctuation induced fluxes near the LCFS at lower hybrid heating and improved confinement transition at the FT-2 tokamak

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