Electron temperature gradient driven turbulence

Jenko, F.; Dorland, W.; Kotschenreuther, M.; Rogers, B. N.

doi:10.1063/1.874014

Cited by 993 publications

(1,220 citation statements)

References 32 publications

(38 reference statements)

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“…in the x 2 -integral (11). Since this integral is taken only along the positive x 2 -axis, such a pole will contribute to L − (p) if Ω 0 > 0 and to L + (p) if Ω 0 < 0.…”

Section: Landau Dampingmentioning

confidence: 99%

See 1 more Smart Citation

Oscillations of zonal flows in stellarators

Helander¹,

Mishchenko²,

Kleiber³

et al. 2011

Plasma Phys. Control. Fusion

108

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The linear response of a collisionless stellarator plasma to an applied radial electric field is calculated, both analytically and numerically. Unlike in a tokamak, the electric field and associated zonal flow develop oscillations before settling down to a stationary state, the so-called Rosenbluth-Hinton flow residual. These oscillations are caused by locally trapped particles with radially drifting bounce orbits. These particles also cause a kind of Landau damping of the oscillations that depends on the magnetic configuration. The relative importance of geodesic acoustic modes and zonal-flow oscillations therefore varies among different stellarators.

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“…in the x 2 -integral (11). Since this integral is taken only along the positive x 2 -axis, such a pole will contribute to L − (p) if Ω 0 > 0 and to L + (p) if Ω 0 < 0.…”

Section: Landau Dampingmentioning

confidence: 99%

“…GENE is an Eulerian code solving the gyrokinetic system of equations in either tokamak [11] or stellarator [12] geometry. It has recently been extended to cover the full minor radius in tokamak geometry, but the stellarator version operates in a flux tube with periodic boundary conditions.…”

Section: Numerical Simulationsmentioning

confidence: 99%

Oscillations of zonal flows in stellarators

Helander¹,

Mishchenko²,

Kleiber³

et al. 2011

Plasma Phys. Control. Fusion

108

View full text Add to dashboard Cite

show abstract

“…For such simulations, a well-established model, so-called "nonlinear gyrokinetics", is usually implemented. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 codes has been developed over the last few years for the simulation of micro-turbulence in nonaxisymmetric geometry, including GKV [20], GENE [21], and GS2 [22]. To complement cpuintensive, peta-scale calculations, the theoretical understanding of instabilities in stellarators has also been pursued.…”

Section: Turbulent Transport Studiesmentioning

confidence: 99%

Recent advances in stellarator optimization

et al. 2017

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Computational optimization has revolutionized the field of stellarator design. To date, optimizations have focused primarily on optimization of neoclassical confinement and ideal MHD stability, although limited optimization of other parameters has also been performed.The purpose of this paper is to outline a select set of new concepts for stellarator optimization that, when taken as a group, present a significant step forward in the stellarator concept.One of the criticisms that has been leveled at existing methods of design is the complexity of the resultant field coils. Recently, a new coil optimization code -COILOPT++, which uses a spline instead of a Fourier representation of the coils, -was written and included in the STELLOPT suite of codes. The advantage of this method is that it allows the addition of real space constraints on the locations of the coils. The code has been tested by generating coil designs for optimized quasi-axisymmetric stellarator plasma configurations of different aspect ratios. As an initial exercise, a constraint that the windings be vertical 1 was placed on large major radius half of the non-planar coils. Further constraints were also imposed that guaranteed that sector blanket modules could be removed from between the coils, enabling a sector maintenance scheme. Results of this exercise will be presented.New ideas on methods for the optimization of turbulent transport have garnered much attention since these methods have led to design concepts that are calculated to have reduced turbulent heat loss. We have explored possibilities for generating an experimental database to test whether the reduction in transport that is predicted is consistent with experimental observations. To this end, a series of equilibria that can be made in the now latent QUASAR experiment have been identified that will test the predicted transport scalings. Fast particle confinement studies aimed at developing a generalized optimization algorithm are also discussed. A new algorithm developed for the design of the scraper element on W7-X is presented along with ideas for automating the optimization approach.

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“…Drake pointed out that slab plasmas have sharp structures, very narrow in poloidal diauthor's e-mail: hamada@nifs.ac.jp rections and wide in radial direction by the buildup of the potential difference along poloidal direction and called this flow as streamers [3]. Later streamers and zonal flows are found to be fundamental phenomena in the large-scale computer simulation of tokamak plasmas [4][5][6][7][8][9][10][11].…”

Section: Short Historymentioning

confidence: 99%

Heavy Ion Beam Probe, Present Status and Future Development

Hamada

Nishizawa

Watari

et al. 2007

Plasma and Fusion Research

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Present status of the analysis of HIBP data on zonal flows, streamers and drift-wave turbulence of the JIPPT-IIU tokamak plasmas, is reviewed. Limiting factors and improvements of heavy ion beam probe towards better understanding of tokamak turbulence, beam attenuation, beam quality of the probing beam, multiple energy analyzers for simultaneous measurement at various cross-sections of the plasmas, proposal for 2-dimensional measurement of the plasma turbulence, are discussed.

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Electron temperature gradient driven turbulence

Cited by 993 publications

References 32 publications

Oscillations of zonal flows in stellarators

Oscillations of zonal flows in stellarators

Recent advances in stellarator optimization

Heavy Ion Beam Probe, Present Status and Future Development

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