Higher Fusion Power Gain with Current and Pressure Profile Control in Strongly Shaped DIII-D Tokamak Plasmas

Lazarus, E. A.; Navratil, G.A.; Greenfield, C. M.; Strait, E. J.; Austin, M. E.; Burrell, K.H.; Casper, T.A.; Baker, D. R.; DeBoo, J. C.; Doyle, E. J.; Durst, R.; Ferron, J. R.; Forest, C.B.; Gohil, P.; Groebner, R. J.; Heidbrink, W. W.; Rao, Hong; Houlberg, W. A.; Howald, A. M.; Hsieh, C. L.; Hyatt, A.W.; Jackson, G.L.; Kim, J.; Lao, L. L.; Lasnier, C.J.; Leonard, A.W.; Lohr, J.; Haye, R. J. La; Maingi, R.; Miller, Robert L.; Murakami, M.; Osborne, T.H.; Perkins, L.J.; Petty, C. C.; Rettig, C. L.; Rhodes, T. L.; Rice, B. W.; Sabbagh, S.A.; Schissel, D.P.; Scoville, J.T.; Snider, R. T.; Staebler, G. M.; Stallard, B. W.; Stambaugh, R.D.; John, H.E. St.; Stockdale, R. E.; Taylor, P.L.; Thomas, D.M.; Turnbull, A. D.; Wade, M. R.; Wood, R. D.; Whyte, D.G.

doi:10.1103/physrevlett.77.2714

Cited by 132 publications

(32 citation statements)

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“…The increase in the pedestal T e , T i leads to a high pedestal pressure and relatively low pressure peaking factor, which increases the stability limit to resistive wall modes [10,11]. Furthermore, the wider pedestals lead to high edge bootstrap currents, low inductive flux consumption, and correspondingly high noninductive fraction.…”

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confidence: 99%

Triggered Confinement Enhancement and Pedestal Expansion in High-Confinement-Mode Discharges in the National Spherical Torus Experiment

et al. 2010

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We report observation of a new high performance regime in discharges in the National Spherical Torus Experiment, where the H mode edge "pedestal" temperature doubles and the energy confinement increases by 50%. The spontaneous transition is triggered by a large edge-localized mode, either natural or externally triggered by 3D fields. The transport barrier grows inward from the edge, with a doubling of both the pedestal pressure width and the spatial extent of steep radial electric field shear. The dynamics suggest that 3D fields could be applied to reduce edge transport in fusion devices.

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confidence: 99%

Triggered Confinement Enhancement and Pedestal Expansion in High-Confinement-Mode Discharges in the National Spherical Torus Experiment

et al. 2010

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“…ITBs have been produced on different tokamaks, moreover on DIII-D [50], JT-60U [51] and JET [52]. The formation of an ion ITB dramatically reduces ion heat and particle flux from the core (sub-neoclassical ion thermal diffusivity has been obtained).…”

Section: B E×b Shear Effects On Internal Transport Barriersmentioning

confidence: 99%

Radial Electric Fields and Transport Barriers

Crombé

Oost

2012

Fusion Science and Technology

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“…n=n0( 1 -na); n0=as0/D; (10) BB(0)/(i-n/a)m; m=D/Da (11) As it is seen from (10) the plasma density decreases linearly for r -* a, while the magnetic field sharply increases at D/Da>> 1.…”

Section: Analysis Of Equations (1) -(2)mentioning

confidence: 99%

Lasers for the magnetic configuration control in tokamaks and stellarators

2000

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The possibility of creating magnetic configurations with improved confinement based on the laser ablation of a pellet (or few pellets) of frozen hydrogen is considered. The advantageous characteristic of the proposed laser methods is that they allow a local control of the plasma parameters and magnetic field.To solve the above problems, a frozen-hydrogen pellet is injected into the plasma volume and irradiated by laser pulse. As a result of mutual diffusion of laser plasma and magnetic field, some profiles of plasma density and magnetic configuration are realized. It is shown that quasi-stationary equilibrium states of tokamak (stellarator) plasma colunm sustained by the uninterrupted fuel feeding can be constructed. It is found that specified profiles of plasma density (pressure) and magnetic field can be provided by using some plasma particles source whose intensity is determined by the laser flux density.

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Higher Fusion Power Gain with Current and Pressure Profile Control in Strongly Shaped DIII-D Tokamak Plasmas

Cited by 132 publications

References 19 publications

Triggered Confinement Enhancement and Pedestal Expansion in High-Confinement-Mode Discharges in the National Spherical Torus Experiment

Triggered Confinement Enhancement and Pedestal Expansion in High-Confinement-Mode Discharges in the National Spherical Torus Experiment

Radial Electric Fields and Transport Barriers

Lasers for the magnetic configuration control in tokamaks and stellarators

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