ITER-grade tungsten limiters damage under high turbulent heat flux in the T-10 tokamak

Grashin, S.A.; Arkhipov, Ievgen I.; Budaev, V. P.; Karpov, A. V.; Klyuchnikov, L. A.; Khimchenko, L. N.; Melnikov, A. V.; Sarychev, D. V.; Sergeev, N. S.; Zemtsov, I. A.

doi:10.1016/j.fusengdes.2019.03.115

Cited by 17 publications

(4 citation statements)

References 4 publications

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“…Tungsten oxides on T-10 limiters were found in [27] and in this work. If the contact of plasma with this surface has an N-shaped current-voltage characteristic, it acts as an amplifying element with positive feedback, which can lead to instabilities of the current in the circuit consisting of plasma and two surfaces, connected by conductive structural elements of the tokamak chamber.…”

Section: Discussionsupporting

confidence: 70%

“…Analyses were performed using several techniques, such as laser induced breakdown spectroscopy (LIBS), scanning electron microscopy (SEM), energy dispersive analyses (EDA), X-ray diffraction (XRD), thermal desorption spectrometry (TDS), and nuclear reaction analyses (NRA). Description of the T-10 operation with the W limiter was given in [27].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Post-mortem analyses of gap facing surfaces of tungsten tiles of T-10 ring limiter

Писарев

Arkhipov

Babich

et al. 2021

Fusion Engineering and Design

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Section: Discussionsupporting

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Post-mortem analyses of gap facing surfaces of tungsten tiles of T-10 ring limiter

Писарев

Arkhipov

Babich

et al. 2021

Fusion Engineering and Design

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“…After irradiation with high-temperature plasma in fusion devices, the materials acquire a stochastic surface structure. Such experiments were carried out on tokamaks [1][2][3][26][27][28][29][30][31][32][33], QSPA powerful plasma accelerator facility [2,3,34], and linear plasma devices used for testing and treatment of refractory materials [35][36][37][38]. Experiments in such devices provide a powerful plasma-thermal load on the material components of the wall facing the plasma.…”

Section: The Micro-and Nanostructured Surfaces 231 Cauliflower-like S...mentioning

confidence: 99%

Heat Transfer on Micro and Nanostructured Rough Surfaces Synthesized by Plasma

Дедов

Budaev

2022

Symmetry

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The review summarizes recent experimental results of studying heat transfer on rough surfaces synthesized by plasma. The plasma-surface interaction leads to the stochastic clustering of the surface roughness with a high specific area breaking the symmetry of the virgin surface of the initial crystalline materials. Such a surface is qualitatively different from the ordinary Brownian surface. The micro- and nanostructured surface consist of pores, craters, and nanofibers of size from tens of nanometers to tens of microns, which can provide new heat transfer properties related to a violation of the symmetry of the initial materials. In recent years, new results have been obtained in the study of heat transfer during phase change on plasma-modified surfaces in relation to energy, chemical, and cryogenic technologies. The objective of the review is to describe the specific structure of refractory metals after high-temperature plasma irradiation and the potential application of plasma processing of materials in order to create heat exchange surfaces that provide a significant intensification of two-phase heat transfer. Refractory metals with such a highly porous rough surface can be used as plasma-facing components for operation under extreme heat and plasma loads in thermonuclear and nuclear reactors, as catalysts for hydrogen production, as well as in biotechnology and biomedical applications.

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“…The tokamak limiter, like the divertor, is exposed to the high heat load coming from the plasma which can also be used as a platform to test the performance and reliability of different types of PFCs [22]. EAST is aimed to explore the advanced steady-state plasma operation modes.…”

Section: Introductionmentioning

confidence: 99%

Melting of W/Cu flat type component for main limiter and its impact on plasma operation in EAST experiments

Xuan,

Zhu,

Gao

et al. 2024

Nucl. Fusion

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A type of actively cooled W/Cu flat-type component with high heat exhaust capacity was installed as limiter during the EAST spring plasma campaign in 2022, aiming to support the long pulse operation. Unfortunately, severe melting phenomena with obvious droplets ejection of the flat-type W/Cu limiter was repeatedly monitored by CCD and IR cameras, which not only induced the failure of component but also seriously influenced plasma operation. The high temperature around midplane of W/Cu flat-type main limiter is identified to be closely connected with ICRF induced fast ions loss. Indeed, the surface temperature of W/Cu flat-type main limiter was too high to ignore. The damage of flat-type structure, however, usually started between the joint interface of W plates and CuCrZr heat sink material. Such damage would in turn lead to the gradual increase of surface temperature which eventually would cause melting of W plates. Once melting events occurred on the W/Cu flat-type main limiter, the vast majority of cases would result in plasma disruption. Moreover, the damage of main limiter would rapidly deteriorate. Hence, more attention should be paid to how to improve the fatigue lifetime of the joint interface. Such test results of flat-type W/Cu component for limiter are important references for the improvement and application of W/Cu flat-type component for high heat flux area in fusion devices.

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ITER-grade tungsten limiters damage under high turbulent heat flux in the T-10 tokamak

Cited by 17 publications

References 4 publications

Post-mortem analyses of gap facing surfaces of tungsten tiles of T-10 ring limiter

Post-mortem analyses of gap facing surfaces of tungsten tiles of T-10 ring limiter

Heat Transfer on Micro and Nanostructured Rough Surfaces Synthesized by Plasma

Melting of W/Cu flat type component for main limiter and its impact on plasma operation in EAST experiments

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