One-dimensional model of detached plasmas in the scrape-off layer of a divertor tokamak

Goswami, Rajiv; Kaw, P. K.; Warrier, M.; Singh, Raghvendra; Deshpande, Shantanu

doi:10.1063/1.1342028

Cited by 17 publications

(25 citation statements)

References 45 publications

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“…2.1. They include interaction with neutrals and impurity cooling [4][5][6][7]. The differences of our model from those of precedent works are the neutral equations discussed in Sec.…”

Section: Introductionmentioning

confidence: 72%

1D Modeling of LHD Divertor Plasma and Hydrogen Recycling

Kawamura

Tomita

Kobayashi

et al. 2010

Plasma and Fusion Research

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One dimensional plasma and neutral model of the divertor plasma in Large Helical Device is presented. The plasma is described by stationary fluid equations for electron and ion. The atomic processes such as dissociation of hydrogen molecules released from the divertor plate, ionization of hydrogen atoms, charge exchange and recombination are included in equations of neutrals. This model is intended to be employed in an integrated simulation where an equilibrium of the upstream plasma and plasma-surface interactions at the divertor plate are solved in different numerical codes separately. From the computational point of view, the numerical code for the divertor plasma is developed for 1D flux tube where the boundary conditions of both ends are specified. The calculation time is less than one second and reasonably short to use in future integrated simulations. In the results, interactions between plasma and neutrals and dependence of the energy loss on the plasma density are studied. In low density case, the energy is lost through ionization and charge exchange but the total amount of the loss is small and the impurity loss is negligibly small. In high density case, the ionization loss and impurity cooling become much larger than the charge exchange loss and causes a drop of the heat flux.

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“…2.1. They include interaction with neutrals and impurity cooling [4][5][6][7]. The differences of our model from those of precedent works are the neutral equations discussed in Sec.…”

Section: Introductionmentioning

confidence: 72%

1D Modeling of LHD Divertor Plasma and Hydrogen Recycling

Kawamura

Tomita

Kobayashi

et al. 2010

Plasma and Fusion Research

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“…If M t is known, the whole profile M (x) can be determined from Eq. (12). As it is already mentioned in [4,8], the different roots of this equation describe the plasma flow in the sub-and supersonic phase, respectively.…”

Section: Supersonic Flow In the Solmentioning

confidence: 89%

Development of the Detachment under the Influence of the Supersonic Flow in the Divertor Region

Marchuk

Tokar

2008

Contrib. Plasma Phys.

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It is demonstrated in the framework of a one-dimensional model for the scrape-off layer that with increasing upstream plasma density and decreasing temperature near divertor target plates a supersonic flow develops in the front of the target. This flow is an important mechanism for the transition from high-recycling regime to a weak detached state and has a significant impact on the plasma parameters, in particular, the pressure and particle flux to the plates, after detachment.

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“…4͑b͒. 18,29,30 The size of the recycling zone can be represented by the distance between the plasma density peak and the divertor plate, and it amounts to a few centimeters for the illustrated cases in Fig. 4.…”

Section: -5mentioning

confidence: 99%

“…Recently, there was a numerical study that presented an intensive investigation of the detachment physics using a onedimensional simulation code incorporated with a neutral transport model that was simply tailored to match the Monte Carlo results or experimental data. 18 In the present numerical work, we aim to present a fully coupled fluid-kinetic hybrid modeling for plasma, neutral, and impurity particle transports in a two-dimensional domain with the capability of demonstrating the formation progress of a recycling zone. The resultant simulation code enables us to account for the detachment phenomena more rigorously while most existing numerical codes still appear to have certain limitations in such applications.…”

Section: Introductionmentioning

confidence: 99%

Fluid-particle hybrid simulation on the transports of plasma, recycling neutrals, and carbon impurities in the Korea Superconducting Tokamak Advanced Research divertor region

Kim

Hong

2005

Physics of Plasmas

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A two-dimensional simulation modeling that has been performed in a self-consistent way for analysis on the fully coupled transports of plasma, recycling neutrals, and intrinsic carbon impurities in the divertor domain of tokamaks is presented. The numerical model coupling the three major species transports in the tokamak edge is based on a fluid-particle hybrid approach where the plasma is described as a single magnetohydrodynamic fluid while the neutrals and impurities are treated as kinetic particles using the Monte Carlo technique. This simulation code is applied to the KSTAR ͑Korea Superconducting Tokamak Advanced Research͒ tokamak ͓G. S. Lee, J. Kim, S. M. Hwang et al., Nucl. Fusion 40, 575 ͑2000͔͒ to calculate the peak heat flux on the divertor plate and to explore the divertor plasma behavior depending on the upstream conditions in its base line operation mode for various values of input heating power and separatrix plasma density. The numerical modeling for the KSTAR tokamak shows that its full-powered operation is subject to the peak heat loads on the divertor plate exceeding an engineering limit, and reveals that the recycling zone is formed in front of the divertor by increasing plasma density and by reducing power flow into the scrape-off layer. Compared with other researchers' work, the present hybrid simulation more rigorously reproduces severe electron pressure losses along field lines by the presence of recycling zone accounting for the transitions between the sheath limited and the detached divertor regimes. The substantial profile changes in carbon impurity population and ionic composition also represent the key features of this divertor regime transition.

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One-dimensional model of detached plasmas in the scrape-off layer of a divertor tokamak

Cited by 17 publications

References 45 publications

1D Modeling of LHD Divertor Plasma and Hydrogen Recycling

1D Modeling of LHD Divertor Plasma and Hydrogen Recycling

Development of the Detachment under the Influence of the Supersonic Flow in the Divertor Region

Fluid-particle hybrid simulation on the transports of plasma, recycling neutrals, and carbon impurities in the Korea Superconducting Tokamak Advanced Research divertor region

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