Robustness of radiative mantle plasma power exhaust solutions for ITER

Mandrekas, J.; Stacey, Weston M.; Kelly, F. A.

doi:10.1088/0029-5515/37/7/i09

Cited by 18 publications

(21 citation statements)

References 33 publications

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“…6, where SOL radiation dropped as mantle radiation, and hence the SOL electron temperature, changed. Modeling has shown that krypton may be effective for impurity seeding in a reactor [15].…”

Section: Discussionmentioning

confidence: 99%

Edge plasma effects in DIII-D impurity seeded discharges

Jackson

Boedo

Lasnier

et al. 2003

Journal of Nuclear Materials

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Section: Discussionmentioning

confidence: 99%

Edge plasma effects in DIII-D impurity seeded discharges

Jackson

Boedo

Lasnier

et al. 2003

Journal of Nuclear Materials

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“…(1). The application of impurities in fusion reactors will require detailed modelling, but calculations for ITER have demonstrated that solutions are possible with a high radiating fraction inside the LCFS [33]. In such scenarios, feedback control could be used to control impurity radiation but the minimum concentrations required to suppress ITG turbulence have yet to be established.…”

Section: Discussionmentioning

confidence: 99%

Effects of impurity seeding in DIII-D radiating mantle discharges

et al. 2002

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Impurity injection with noble gases has been used in DIII-D to increase radiation in the mantle region, with confinement enhancements above the ITERL-89P L mode scaling relation in both diverted and limited discharges. For discharges with an L mode edge, impurity injection produces a prompt increase in confinement and a more gradual increase in density. These changes occur at densities and radiated power fractions significantly lower than those observed in the TEXTOR tokamak device. ELMing H mode discharges with active pumping and high deuterium gas feed (puff and pump) exhibit an increase in density with no degradation in energy confinement after impurity injection, increasing to nearly the Greenwald density limit following a spontaneous transition several hundred milliseconds after impurity injection. The highest density phase of both L mode and ELMing H mode radiating mantle discharges is usually terminated after the onset of n = 2 MHD activity, identified as an m/n = 3/2 neoclassical tearing mode. A reduction in density fluctuations after impurity injection in the mantle region has been measured using beam emission spectroscopy in L mode discharges and is coincident with reductions in thermal diffusivity and increases in core toroidal rotation. The similarities and differences between these types of impurity seeded discharge will be presented.

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“…Differently from other simulations with impurity seeding [8,9] in which the extrinsic impurities add to the intrinsic ones, the unique feature of our model consists in the selfconsistent interplay between the different impurities. In fact, each impurity affects the flux of the other impurities as well as the level of the power they radiate, due to changes each impurity causes in the local plasma density and temperature at the target, in the edge region and in the core.…”

Section: The Self-consistent Transport Model In Coredivmentioning

confidence: 99%

“…The problem of self-consistent modeling of the core and edge plasma has already been addressed in papers of Becker [9] and of Mandrekas/Stacey [8,12]. In our approach, for the plasma core we follow to a large extent the modeling assumptions in those papers, while a different model is used for the edge.…”

Section: The Self-consistent Transport Model In Coredivmentioning

confidence: 99%

Simulation with the COREDIV code of nitrogen-seeded H-mode discharges at JET

Telesca

Zagórski

Brezinsek

et al. 2011

Plasma Phys. Control. Fusion

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The code COREDIV, self-consistent with respect to both the interaction of plasma core-edge and main plasma impurities, is used to simulate nitrogenseeded discharges in JET. The model is fully described and numerical results are compared with experimental data pertaining to two series of discharges differing in input power, confinement, the level of power radiated and the puffing rate of the main gas. Impurity sources, their transport and densities are considered as functions of the edge and core parameters and consistency of their radiated power is discussed. Special emphasis is given to analysis of the fluxes of carbon and recycled deuterium.

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Robustness of radiative mantle plasma power exhaust solutions for ITER

Cited by 18 publications

References 33 publications

Edge plasma effects in DIII-D impurity seeded discharges

Edge plasma effects in DIII-D impurity seeded discharges

Effects of impurity seeding in DIII-D radiating mantle discharges

Simulation with the COREDIV code of nitrogen-seeded H-mode discharges at JET

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