Preliminary 2D code simulation of the quasi-snowflake divertor configuration in the FAST tokamak

Ridolfini, V. Pericoli; Zagórski, R.; Artaserse, G.; Calabrò, G.; Crisanti, F.; Maddaluno, G.; Ramogida, G.; Viola, B.

doi:10.1016/j.fusengdes.2013.05.093

Cited by 9 publications

(1 citation statement)

References 13 publications

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“…the total volume losses are higher. As already found in the code runs for the tokamak proposal FAST [31] the load mitigating properties of the QSF are exalted at a higher density. Indeed, a further significant drop for the QSF total load is found for n e,sep ⩾ 2.5 × 10 19 m −3 in EAST.…”

Section: Edge Predictive Simulationssupporting

confidence: 65%

EAST alternative magnetic configurations: modelling and first experiments

et al. 2015

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Heat and particle loads on the plasma facing components are among the most challenging issues to be solved for a reactor design. Alternative magnetic configurations may enable tokamak operation with a lower peak heat load than a standard single null (SN) divertor. This papers reports on the creation and control of one of such alternatives: a two-null nearby divertor configuration. An important element of this study is that this two-null divertor was produced on a large superconducting tokamak as an experimental advanced superconducting tokamak. A preliminary experiment with the second null forming a configuration with significant distance between the two nulls and a contracting geometry near the target plates was performed in 2014. These configurations have been designed using the FIXFREE code and optimized with CREATE-NL tools and are discussed in the paper. Predictive edge simulations using the TECXY code are also presented by comparing the advanced divertor and SN configuration. Finally, the experimental results of ohmic and low confinement (L-mode) two-null divertor and SN discharges and interpretative two-dimensional edge simulations are discussed. Future experiments will be devoted to varying the distance between the two nulls in high confinement (H-mode) discharges.

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Section: Edge Predictive Simulationssupporting

confidence: 65%

EAST alternative magnetic configurations: modelling and first experiments

et al. 2015

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Preliminary Comparison of the Conventional and Quasi‐Snowflake Divertor Configurations with the 2D Code EDGE2D/EIRENE in the FAST Tokamak

Viola

Corrigan

Harting

et al. 2014

Contrib. Plasma Phys.

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The new magnetic configurations for tokamak divertors, snowflake and super-X, proposed to mitigate the problem of the power exhaust in reactors have clearly evidenced the need for an accurate and reliable modeling of the physics governing the interaction with the plates. The initial effort undertaken jointly by ENEA and IPPLM has been focused to exploit a simple and versatile modeling tool, namely the 2D TECXY code, to obtain preliminary comparison between the conventional and snowflake configurations for the proposed new device FAST that should realize an edge plasma with properties quite close to those of a reactor. The very interesting features found for the snowflake, namely a power load mitigation much larger than expected directly from the change of the magnetic topology, has further pushed us to check these results with the more sophisticated computational tool EDGE2D coupled with the neutral code module EIRENE. After a preparatory work that has been carried out in order to adapt this code combination to deal with non-conventional, single null equilibria and in particular with second order nulls in the poloidal field generated in the snowflake configuration, in this paper we describe the first activity to compare these codes and discuss the first results obtained for FAST. The outcome of these EDGE2D runs is in qualitative agreement with those of TECXY, confirming the potential benefit obtainable from a snowflake configuration.

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