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Kirnev, G.; Grashin, S.A.; Khimchenko, L. N.; Timchenko, N.N.; Oost, G. Van

doi:10.1023/a:1012837932170

Cited by 15 publications

(10 citation statements)

References 7 publications

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“…In this case, the relative change of the electronion balance can be due to the change of turbulence type from core ITG/DTEM to edge DRI. Figure 16 shows surprisingly good agreement between the experimental position of the velocity shear layer and the region where the DRI becomes dominant according to the calculated growth rates for three instabilities [20,17].…”

Section: Turbulence Studiessupporting

confidence: 55%

“…The peculiarity of T-10 compared to other biasing experiments [17] is the 15% rise in T e and 30% rise in T i together with the 30% rise in n after biasing, figure 12, while in other tokamaks only a rise in n was observed. To identify whether τ E increases due to the biasing or the density rise, two discharges with different initial densities (other parameters are similar) are compared in figure 13.…”

Section: Biasing Experimentsmentioning

confidence: 77%

“…The main goal of the biasing experiments was to study the radial electric field effect on the turbulence reduction, particle and heat confinement, and the impurity exhaust [17]. A positive voltage (+450 V), applied to the electrode inserted 2 cm inside the rail limiter, results in the H-mode transition, while the ECRH power was below the threshold of the spontaneous L-H transition.…”

Section: Biasing Experimentsmentioning

confidence: 99%

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Transport and turbulence studies in the T-10 tokamak

Ossipenko¹

2003

Nucl. Fusion

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Transitions to the improved confinement regimes were studied in the T-10 tokamak with electron cyclotron resonance heating (ECRH). The H-mode regime with and without internal transport barrier (ITB) was obtained and studied. The H-mode was obtained by power increase, pellet injection and biasing. The confinement time in the pellet enhanced confinement regime is 30% higher than that in the spontaneous H-mode. In biasing experiments an enhancement factor of up to 1.55 was obtained for the energy confinement time. It was shown that subtle changes in the safety factor q profile allow us to obtain either ITB or external transport barrier only, or both of them, other conditions being approximately similar. The global confinement in the regime with the density above the Greenwald limit under strong gas-puffing and ECRH was investigated. To identify the type of turbulence responsible for transport, the Ohmic and ECRH regimes with variation of safety factor at the limiter qL and gas puffing were considered. Two regions were observed along the minor radius with different turbulence properties.

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Section: Turbulence Studiessupporting

confidence: 55%

Section: Biasing Experimentsmentioning

confidence: 77%

Section: Biasing Experimentsmentioning

confidence: 99%

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Transport and turbulence studies in the T-10 tokamak

Ossipenko¹

2003

Nucl. Fusion

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“…A positive radial electric-field profile is also observed in the H-mode edge barrier with electron cyclotron heating. 31 Equation ͑28͒ is solved with this M p profile to obtain two-dimensional structures of the electrostatic potential in H mode.…”

Section: Two-dimensional Structure On L / H Transitionmentioning

confidence: 99%

Convective particle transport arising from poloidal inhomogeneity in tokamak H mode

Kasuya

Itoh

2005

Physics of Plasmas

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In tokamak high-confinement modes ͑H modes͒, a large poloidal flow exists within an edge transport barrier, and the electrostatic potential and density profiles can be steep both in the radial and poloidal directions. The two-dimensional structures of the electrostatic potential, density, and flow velocity near the edge of a tokamak plasma are investigated. The analysis is carried out with the momentum conservation law using the shock ordering. For the case with a strong radial electric field ͑H-mode case͒, a particle flux is induced from asymmetry of the poloidal electric field in the transport barrier. This convective transport is found to depend weakly on collisionality, and changes its direction in accordance with the direction of the radial electric field, the toroidal magnetic field, and the plasma current. The divergence of a particle flux is a source of temporal variation of the density, and there are negative divergence regions both in the inward and outward flux cases. Thus this convective particle flux is a new candidate for the cause of the rapid establishment of the density pedestal after the onset of low to high confinement mode ͑L / H͒ transition.

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“…However, it has been also shown that for a negative limiter and electrode bias (usually in case of emissive), modification of either the global or the edge plasma parameters was observed. In order to obtain the larger current necessary to modify confinement at negative applied voltages, biasing experiments have been performed using the horizontal limiter inserted well inside the fully poloidal limiter position or using an emissive limiter (12)(13)(14)(15)(16). Much of the theoretical work on E × B shear stabilization effects only considers the effect of the first derivative of the E × B velocity.…”

Section: Introductionmentioning

confidence: 99%

Design and construction of hot limiter biasing system for the tokamak

Elahi

Ghoranneviss

Arvin

et al. 2013

Radiation Effects and Defects in Solids

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A hot limiter biasing system with a simplified fast switch circuit was designed, constructed, and installed on the IR-T1 tokamak, and then the negative voltage applied to a hot limiter inserted inside the tokamak fixed limiter and the plasma current, poloidal, and radial components of the magnetic fields, loop voltage, diamagnetic flux, and the ion saturation currents in the absence and presence of the biased limiter were measured. Results of measurements of biasing effects on the plasma equilibrium behavior and edge plasma rotation are compared and discussed.

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Cited by 15 publications

References 7 publications

Transport and turbulence studies in the T-10 tokamak

Transport and turbulence studies in the T-10 tokamak

Convective particle transport arising from poloidal inhomogeneity in tokamak H mode

Design and construction of hot limiter biasing system for the tokamak

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