Observation of turbulence suppression after electron-cyclotron-resonance-heating switch-off on the HL-2A tokamak

Liu, Y.; Shi, Z.B.; Dong, Y.B.; Sun, H. J.; Sun, A.P.; Li, Y. G.; Xia, Zhiyong; Li, W.; Ding, X.T.; Xiao, W.W.; Zhou, Yan; Zhou, J.; Rao, Jun; Liu, Z. T.; Yang, Qingwei; Duan, X.R.

doi:10.1103/physreve.84.016403

Cited by 7 publications

(4 citation statements)

References 17 publications

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“…The direct and immediate influence of heating on turbulence has been suggested. Abrupt variation of transport at the turnoff of heating power has been implied [3,5,6,32,33] and is a possible candidate to explain the 'missing power' [34]. Hysteresis in the flux-gradient relation has also been suggested by several authors (e.g.…”

Section: Discussionmentioning

confidence: 86%

How is turbulence intensity determined by macroscopic variables in a toroidal plasma?

et al. 2013

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We report observations of the dynamic response of micro-fluctuations and turbulent flux to a low-frequency heating power modulation in the Large Helical Device. The responses of heat flux and micro-fluctuation intensity differ from that of the change in temperature gradient. This result violates the local transport model, where turbulence is determined by the local temperature gradient. A new relationship between flux, gradient and turbulence is found. In addition to the temperature gradient, the heating rate is proposed as a new, direct controlling parameter of turbulence to explain the fast response of turbulence against periodic modulation of heating power.

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Section: Discussionmentioning

confidence: 86%

How is turbulence intensity determined by macroscopic variables in a toroidal plasma?

et al. 2013

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“…Since then, the same group of authors have published a series of papers on fermion localization for several types of thick branes [20,21,22,23]. Also, some of the authors of the present work considered fermionic resonances in branes with internal structure [24].…”

Section: Introductionmentioning

confidence: 83%

Fermions on deformed thick branes

2011

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Abstract. In this work we investigate the issue of fermion localization and resonances in (4, 1)-deformed branes constructed with one scalar field coupled with gravity. Such models provide us branes with internal structures that turns the gravitational interaction more effective for fermions aside the brane, increasing their lifetime. The coupling between the scalar field and spinors is a necessary condition for fermions to be localized on such branes. After performing a chiral decomposition of the five-dimensional spinor we found resonances with both chiralities. The correspondence between the spectra for left and right chirality is guaranteed and Dirac fermions are realized on the brane.

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“…This includes: (i) the observation of a peaked profiles, strong shear state achieved with edge fueling and no additional heating. We do note that the IOC (Improved Ohmic Confinement) state of ASDEX 32 and the PITB (Particle ITB) state of HL-2A 33 have same features in common with the result reported here: (ii) the clearest and well-demonstrated hysteresis loop related to the transition; (iii) the measurements of core plasma Reynolds stresses and the demonstration of the link between the fluctuation Reynolds work and the barrier transition; (iv) the clear observation of electron and ion feature co-existence in the core plasma, as rT i steepens. Further comparisons and contrasts with tokamaks will be reported in the future.…”

Section: Discussionmentioning

confidence: 82%

Spontaneous profile self-organization in a simple realization of drift-wave turbulence

et al. 2016

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We report the observation of a transport bifurcation that occurs by spontaneous self-organization of a drift-wave and shear flow system in a linear plasma device. As we increase the magnetic field above a threshold (B Cr ¼ 1200 G), a global transition occurs, with steepening of mean density and ion pressure profiles, onset of strong E Â B shearing, a reduction of turbulence, and improved turbulent radial particle transport. An abrupt transition appears in the graph of turbulent particle flux versus density gradient. Hysteresis in the density gradient further confirms this transport bifurcation. The total Reynolds work on the flow sharply increases above threshold. This correlates with the increase of density steepness, which suggests the Reynolds stress-driven flow that plays an essential role in density steepening and transport bifurcation. A change in turbulence feature from drift waves (DWs) to a mix of DWs and ion temperature gradients also coincides with the transport bifurcation. Interesting phenomena related to the transport bifurcation are also reported; a local inward particle flux, the coexistence of ion and electron features, and a self-sustained axial flow absent momentum input. V

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Observation of turbulence suppression after electron-cyclotron-resonance-heating switch-off on the HL-2A tokamak

Cited by 7 publications

References 17 publications

How is turbulence intensity determined by macroscopic variables in a toroidal plasma?

How is turbulence intensity determined by macroscopic variables in a toroidal plasma?

Fermions on deformed thick branes

Spontaneous profile self-organization in a simple realization of drift-wave turbulence

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