Simulation of electromagnetic VDE plasma effects on divertor structures of DEMO

Cocilovo, V.; Ramogida, G.

doi:10.1016/j.fusengdes.2018.05.034

Cited by 5 publications

(2 citation statements)

References 2 publications

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“…• In the mechanical analysis the static body force f (r) = j(r) × B(r) is applied for radially decaying toroidal magnetic field B(r) = B 0 R 0 /r acting on each element of the model with nominal field B 0 = 5.667 T and major radius R 0 = 9.072 m [16].…”

Section: Boundary Conditionsmentioning

confidence: 99%

Study of electromagnetic disruption forces for plasma detachment measurements in DEMO

Shawish

Giannone

Kallenbach

2019

Fusion Engineering and Design

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Global plasma instabilities such as plasma disruptions and vertical displacement events (VDEs) can generate huge transient electrical currents in the conductive parts of the divertor. The interaction of the currents with the magnetic field induces Lorentz force loads. Particularly, the force induced by a VDE can impose a critical impact on the divertor water-cooling pipes due to high current density. A recently proposed isolated-target design solution for the DEMO divertor introduces a shunt element between the target plate and the cassette body to divert electrical current towards more massive cassette body. Such a design solution is also considered as a diagnostic tool for measuring thermo currents (voltages) through a shunt resistor to control plasma detachment.In this study, a finite-element analysis is performed to provide a conservative upper value for the shunt resistance by investigating the impact of the electromagnetic disruption forces on the integrity of water-cooling pipes in the isolated-target design solution of the DEMO divertor. In the analysis, a maximum allowed pipe current is estimated assuming realistic material properties and magnetic fields, and true geometries of the divertor cassette and water-cooling pipes fixed to the cassette. The results show that local pipe yielding (representing damage initiation) develops for electrical currents larger than ∼3.5 kA, which sets a conservative (assuming extreme VDE halo currents) upper value for the shunt resistance to ∼40 µΩ.

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Section: Boundary Conditionsmentioning

confidence: 99%

Study of electromagnetic disruption forces for plasma detachment measurements in DEMO

Shawish

Giannone

Kallenbach

2019

Fusion Engineering and Design

View full text Add to dashboard Cite

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“…One of the few feasibility studies [6,9] on thermo-current measurement in isolated-target divertor model in DEMO was presented in our previous work [6]. In that study a finite-element (FE) electro-mechanical analysis was conducted to calculate the conservative upper value of shunt resistance.…”

Section: Introductionmentioning

confidence: 99%