Calculation of the surface binding energy for ion sputtered particles

“…A mica specimen was irradiated with alpha particles and the ejection of atoms was detected on the other side, along closed packed lines. The ejected atoms could not been identified and also sputtering energies are not known exactly, however from experimental and theoretical studies, they are known to be in the range of 4-8 eV (Kudriavtsev et al, 2005).…”

Section: Motivation: Dynamics Of Potassium Ions In Layered Silicatesmentioning

confidence: 99%

Optimization of a label‐free biosensor vertically characterized based on a periodic lattice of high aspect ratio SU‐8 nano‐pillars with a simplified 2D theoretical model

Casquel

Holgado

Sanza

et al. 2011

Phys. Status Solidi (c)

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We have recently demonstrated a biosensor based on a lattice of SU8 pillars on a 1 μm SiO2/Si wafer by measuring vertically reflectivity as a function of wavelength. The biodetection has been proven with the combination of Bovine Serum Albumin (BSA) protein and its antibody (antiBSA). A BSA layer is attached to the pillars; the biorecognition of antiBSA involves a shift in the reflectivity curve, related with the concentration of antiBSA. A detection limit in the order of 2 ng/ml is achieved for a rhombic lattice of pillars with a lattice parameter (a) of 800 nm, a height (h) of 420 nm and a diameter(d) of 200 nm. These results correlate with calculations using 3D‐finite difference time domain method. A 2D simplified model is proposed, consisting of a multilayer model where the pillars are turned into a 420 nm layer with an effective refractive index obtained by using Beam Propagation Method (BPM) algorithm. Results provided by this model are in good correlation with experimental data, reaching a reduction in time from one day to 15 minutes, giving a fast but accurate tool to optimize the design and maximizing sensitivity, and allows analyzing the influence of different variables (diameter, height and lattice parameter). Sensitivity is obtained for a variety of configurations, reaching a limit of detection under 1 ng/ml. Optimum design is not only chosen because of its sensitivity but also its feasibility, both from fabrication (limited by aspect ratio and proximity of the pillars) and fluidic point of view. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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“…It is well known that a physical sputtering yield is a function of incident ion energy. The Bohdansky formulae for physical sputtering yield has been given as [16], [17] …”

Section: Wall-sputtering Models For Iter-like Wallmentioning

confidence: 99%

“…ǫ is defined to be E 0 /E T F where E 0 and E T F are the ion wall-impacting energy and the Thomas-Fermi energy, respectively [16], [17]. Assuming a typical sheath formation of negative potential at the wall [18], the ion wall-impacting energy E 0 can be calculated as 2kT i + 3kT e .…”

Section: Wall-sputtering Models For 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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Calculation of the surface binding energy for ion sputtered particles

Cited by 148 publications

References 13 publications

Drifting localization of ionization runaway: Unraveling the nature of anomalous transport in high power impulse magnetron sputtering

Drifting localization of ionization runaway: Unraveling the nature of anomalous transport in high power impulse magnetron sputtering

Optimization of a label‐free biosensor vertically characterized based on a periodic lattice of high aspect ratio SU‐8 nano‐pillars with a simplified 2D theoretical model

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

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