Retention properties of plasma particles in tungsten exposed to LHD divertor plasmas

“…Moreover, although different types of irradiations occur simultaneously in actual fusion devices, they are used to be treated individually, such as for He or hydrogen plasma with different energies and fluxes irradiation on different PFMs [3,4,6,10,11,13,15,16,19,25]. Recently, experimental studies have also been performed with the synergistic actions of more than one types of irradiations, such as, He irradiation with high heat loads [7,12,21,24] or with different temperatures [5,9] and hydrogen isotope-helium sequential irradiation [8,14,17,18,20,22,24].…”

Section: Introductionmentioning

confidence: 99%

A Cluster Dynamics Model For Accumulation Of Helium In Tungsten Under Helium Ions And Neutron Irradiation

Zhou

Ning

et al. 2012

Commun. comput. phys.

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A cluster dynamics model based on rate theory has been developed to describe the accumulation and diffusion processes of helium in tungsten under helium implantation alone or synergistic irradiation with neutron, by involving different types of objects, adopting up-to-date parameters and complex reaction processes as well as considering the diffusion process along with depth. The calculated results under different conditions are in good agreement with experiments much well. The model describes the behavior of helium in tungsten within 2D space of defect type/size and depth on different ions incident conditions (energies and fluences) and material conditions (system temperature and existent sinks), by including the synergistic effect of helium-neutron irradiations and the influence of inherent sinks (dislocation lines and grain boundaries). The model, coded as IRadMat, would be universally applicable to the evolution of defects for ions/neutron irradiated on plasma-facing materials.

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“…Therefore, effects of He ion irradiation on W and other metals have been investigated extensively over a wide range of burning plasma conditions with different ion energy, temperature and fluency, using ion accelerators or large-sized plasma confinement devices as well as several analysis techniques [4][5][6][7][8][9][10][11][12]. Related theoretical works have also been performed based on the cluster dynamics model [13,14] and kinetic Monte Carlo (KMC) model [15,16] recently.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, although different types of irradiation occur simultaneously in actual fusion devices, they are usually treated individually for simplicity, such as for He or hydrogen plasma with different energies and fluxes irradiation on different PFMs [3,5,8,[10][11][12][13]. Recently, experiments have been performed to study the synergistic effects, such as, He irradiations with high heat loads [6] or with different temperatures [4,7] and deuterium plasma irradiation with low-energy He plasma pre-exposure [9].…”

Section: Introductionmentioning

confidence: 99%