Mitigation of the divertor heat load in DEMO reactor by impurity seeding

Ivanova‐Stanik, I.; Zagórski, R.

doi:10.1016/j.jnucmat.2014.11.105

Cited by 24 publications

(19 citation statements)

References 11 publications

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“…In order to reproduce the experimental density profi le, relatively strong plasma peaking has been assumed (C p = 0.3), where C p is the density peaking coeffi cient [8,9].…”

Section: Model and Resultsmentioning

confidence: 99%

COREDIV modelling of JET ILW discharges with different impurity seeding: nitrogen, neon, argon and krypton

Ivanova‐Stanik

Zagórski

2017

Nukleonika

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Numerical simulations with the COREDIV code of JET H-mode discharges with 25 MW of auxiliary heating in the ITER-like wall (ILW) configuration with different impurity seedings – nitrogen (N), neon (Ne), argon (Ar) and krypton (Kr) – are presented. All simulations have been performed with the same transport model and input discharge parameters like auxiliary heating, volume average plasma density, confinement factor. Only the seeded impurity puff rate was changed in the calculations. It appears that for the considered heating power of 25 MW and relatively low volume electron average density <ne> = 6.2 × 1019 m−3, impurity seeding is necessary. It has been found that for every gas at the maximum level of the seeding rate, allowed by the code convergence, the power to the plate is reduced up to 2–4 MW, with electron temperature at the plate of about 2 eV, indicating semi-detached conditions in the divertor region. It should be noted, however, that in cases with low and medium Z impurity (N, Ne and Ar), tungsten radiation is a significant part of radiation losses and stays above 22–32% of the total energy losses, but for high Z impurity (Kr) it is reduced up to 10% of the total losses. The maximum of the Kr radiation is between the pedestal region and separatrix, showing that radiative mantle can be created, which might have a strong influence on the plasma parameters in the pedestal region.

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“…In order to reproduce the experimental density profi le, relatively strong plasma peaking has been assumed (C p = 0.3), where C p is the density peaking coeffi cient [8,9].…”

Section: Model and Resultsmentioning

confidence: 99%

COREDIV modelling of JET ILW discharges with different impurity seeding: nitrogen, neon, argon and krypton

Ivanova‐Stanik

Zagórski

2017

Nukleonika

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“…The latter has been originally part of the [77], which consists of a 1D core plasma code taking confinement times as input parameter and utilising a slab model for the SOL/divertor plasma can be useful for rapid estimates in system analysis codes for DEMO (e.g. [78,79]). Some progress is seen in the validation of COREDIV for existing experiments (e.g.…”

Section: Code Developments and Benchmarksmentioning

confidence: 99%

Modelling of plasma-edge and plasma–wall interaction physics at JET with the metallic first-wall

et al. 2016

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An overview is given on the recent progress on edge modelling activities for the JET ITERlike wall using the computational tools like the SOLPS or EDGE2D-EIRENE code. The validation process of these codes on JET with its metallic plasma-facing components is an important step towards predictive studies for ITER and DEMO in relevant divertor operational conditions, i.e., for detached, radiating divertors. With increased quantitative credibility in such codes more reliable input to plasma-wall and plasma-material codes can be warranted, which in turn results in more realistic and physically sound estimates of the lifetime expectations and performance of a Be first-wall and a W-divertor, the same materials configuration foreseen for ITER. A brief review is given on the recent achievements in the plasma-wall interaction and material migration studies. Finally, a short summary is given on the availability and development of integrated codes to assess the performance of an JET-ILW baseline scenario also in view of the preparation for a JET DT-campaign.

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“…Note that the recombination radiation is negligible in comparison with the line radiation. Depending on the type of impurity seeding to the SOL, the radiation cooling of the edge plasma has various speed and fraction, which depend on various radiation intensities of specific impurities …”

Section: Introductionmentioning

confidence: 99%

“…Depending on the type of impurity seeding to the SOL, the radiation cooling of the edge plasma has various speed and fraction, which depend on various radiation intensities of specific impurities. [2] To evaluate the influence of the impurity gas puff, theoretical studies were performed using the numerical modelling of the edge plasma in tokamaks, [3] which show the importance of impurity seeding in the process of energy transport in the edge tokamak plasma. On the other hand, the amount and types of impurities also depend on the divertor plate material, which diffuses to the edge plasma in the process of sputtering and increases the impurity radiation in the SOL and core regions.…”

Section: Introductionmentioning

confidence: 99%

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TECXY simulations of multi‐species impurity seeding in DEMO reactor

Chmielewski

Zagórski

Ivanova‐Stanik

et al. 2018

Contributions to Plasma Physics

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Numerical studies have been performed to investigate the influence of the few impurity species on the heat load reduction and the SOL plasma parameters in the European DEMO reactor. Two‐dimensional multi‐fluid TECXY code has been used to model edge plasma transport described by the classical set of transport equations of multi‐species plasma derived by Braginskii. The TECXY code solves transport equations for few impurity species and all associated ionization stages simultaneously in a two‐dimensional poloidal geometry. This paper describes the results of numerical simulations of the edge plasma performed for the DEMO reactor with neon and krypton seeding, as well as with a mixture of neon and krypton impurities. We aimed to obtain the energy flux reduction to the target plate at the smallest possible increase of the effective charge value considering gas puffing with various mixtures of impurities. It has been found that the heat load reduction can be improved for a specific mixture of impurity species seeded simultaneously to the edge plasma.

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Mitigation of the divertor heat load in DEMO reactor by impurity seeding

Cited by 24 publications

References 11 publications

COREDIV modelling of JET ILW discharges with different impurity seeding: nitrogen, neon, argon and krypton

COREDIV modelling of JET ILW discharges with different impurity seeding: nitrogen, neon, argon and krypton

Modelling of plasma-edge and plasma–wall interaction physics at JET with the metallic first-wall

TECXY simulations of multi‐species impurity seeding in DEMO reactor

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