Beryllium coatings on metals for marker tiles at JET: development of process and characterization of layers

Lungu, C.P.; Mustaţǎ, I.; Zaroschi, V.; Lungu, A. M.; Anghel, A.; Chiru, P.; Rubel, M.; Coad, P.; Matthews, G. F.

doi:10.1088/0031-8949/2007/t128/030

Cited by 68 publications

(39 citation statements)

References 4 publications

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“…The beryllium layers are fabricated by thermionic vacuum arc deposition at the National Institute of Laser, Plasma and Radiation Physics in Bucharest [12].…”

Section: Experimental Approachmentioning

confidence: 99%

Interaction of nitrogen ions with beryllium surfaces

Dobes

Köppen

Oberkofler

et al. 2014

Nuclear Instruments and Methods in Physics Research Section B:

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The interaction of energetic nitrogen projectiles with a beryllium surface is studied using a highly sensitive quartz crystal microbalance technique. The overall mass change rate of the beryllium sample under N2 + ion impact at an ion energy of 5000 eV (i.e. 2500 eV per N) is investigated in situ and in real--time. A strong dependency of the observed mass change rate on the nitrogen fluence (at constant flux) is found and can be attributed to the formation of a nitrogen containing mixed material layer within the ion penetration depth. The presented data elucidate the dynamics of the interaction process and the surface saturation with increasing nitrogen fluence in a unique way. Basically, three distinct interaction regimes can be discriminated, which can be linked to the evolution of the surface composition upon nitrogen impact.Steady state surface conditions are obtained at a total cumulative nitrogen fluence of ~8.3·10 17 N atoms per cm 2 . In dynamic equilibrium, the interaction is marked by continuous surface erosion. In this case, the observed total sputtering yield becomes independent from the applied nitrogen fluence and is of the order of 0.4 beryllium atoms per impinging nitrogen atom.

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“…The beryllium layers are fabricated by thermionic vacuum arc deposition at the National Institute of Laser, Plasma and Radiation Physics in Bucharest [12].…”

Section: Experimental Approachmentioning

confidence: 99%

Interaction of nitrogen ions with beryllium surfaces

Dobes

Köppen

Oberkofler

et al. 2014

Nuclear Instruments and Methods in Physics Research Section B:

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“…In the present work, three cobalt thin films of thicknesses t of 1, 3 and 10 nm respectively were deposited onto silicon (111) substrates, using thermionic vacuum arc (TVA) method [10]. The thin cobalt films were first thermal annealed in a vacuum chamber at a pressure of 2×10 -6 mbar at temperature of 750 °C or 800°C.…”

Section: Sample and Experimental Set Upmentioning

confidence: 99%

Lithography-free synthesis of nanostructured cobalt on Si (111) surfaces: structural and magnetic properties

Bounour-Bouzamouche

Chérif

Farhat

et al. 2014

EPJ Web of Conferences

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Abstract. We illustrate the concept of lithography-free synthesis and patterning of magnetic cobalt in the nanometric scale. Our elaboration method allows fabricating 2D architectures of cobalt and cobalt silicide onto silicon (111) surfaces. A continuous cobalt layer of 1, 3 and 10 nm thickness was first deposited by using thermoionic vacuum arc (TVA) technology and then, thermally annealed on vacuum at temperatures from 450° C to 800° C. Surface structure was analyzed by atomic force and field emission-scanning electron microscopies. Above 750° C, regular triangular shape cobalt nanostructures are formed with pattern dimensions varying between 10 and 200 nm. Good control of shape and packing density could be achieved by adjusting the initial thickness and the substrate temperature. Magnetic properties were investigated by means of vibrating sample magnetometer (VSM) technique. The evolution of the coercive field versus packing density and dimensions of the nanostructures was studied and compared to micromagnetic calculations. The observed nanostructures have been modelled by a series of shapes tending to a fractal curve.

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“…It is observed in many laboratory plasmas that the surface of beryllium tiles are easily oxidized [22], [23], [24]. The high affinity of Be to O tends to result in the BeO layer on the wall, which has higher surface binding energy than the pure beryllium wall [22].…”

Section: Beryllium Sputtering In Iter-like Wallmentioning

confidence: 99%

Physics of plasma burn-through and DYON simulations for the JET ITER-like wall

Kim¹,

Sips²,

Contributors³

2013

Nucl. Fusion

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Abstract. This paper presents the DYON simulations of the plasma burn-through phase at Joint European Torus (JET) with the ITER-like wall. The main purpose of the study is to validate the simulations with the ITER-like wall, made of beryllium. Without impurities, the burn-through process of a pure deuterium plasma is described using DYON simulations, and the criterion for deuterium burn-through is derived analytically. The plasma burn-through with impurities are simulated using wallsputtering models in the DYON code, which are modified for the ITER-like wall. The wall-sputtering models and the validation against JET data are presented. The impact of the assumed plasma parameters in DYON simulations are discussed by means of parameter scans. As a result, the operation space of prefill gas pressure and toroidal electric field for plasma burn-through in JET is compared to the Townsend avalanche criterion.Physics of plasma burn-through and DYON simulations for the JET ITER-like wall 2

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Beryllium coatings on metals for marker tiles at JET: development of process and characterization of layers

Cited by 68 publications

References 4 publications

Interaction of nitrogen ions with beryllium surfaces

Interaction of nitrogen ions with beryllium surfaces

Lithography-free synthesis of nanostructured cobalt on Si (111) surfaces: structural and magnetic properties

Physics of plasma burn-through and DYON simulations for the JET ITER-like wall

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