Short-term retention in metallic PFCs: modelling in view of mass spectrometry and LIBS

Abstract Based on the conventional model of hydrogen retention in plasma-facing components, the question of hydrogen outgassing during and after plasma exposure is addressed in relation to mass spectrometry and laser-induced breakdown sprectroscopy (LIBS) measurements. Fundamental differences in retention and release data acquired by LIBS and by mass spectrometry are described analytically and by modelling. Reaction-diffusion simulations are presented that demonstrate possible thermal outgassing effects caused by LIBS. Advantages and limitations of LIBS as a tool for analysis of short term retention are discussed.

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In situ study of short-term retention of deuterium in tungsten during and after plasma exposure in PSI-2

Nuclear Fusion ◽

10.1088/1741-4326/ac112e ◽

2021 ◽

Author(s):

Xi Jiang ◽

Gennady Sergienko ◽

Arkadi Kreter ◽

Sebastijan Brezinsek ◽

Christian Linsmeier

Keyword(s):

Plasma Exposure ◽

Short Term ◽

In Situ Study ◽

Term Retention

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Statistical Complexity of Boolean Cellular Automata with Short-Term Reaction-Diffusion Memory on a Square Lattice

Complex Systems ◽

10.25088/complexsystems.28.3.357 ◽

2019 ◽

Vol 28 (3) ◽

pp. 357-391

Author(s):

Zakarya Zarezadeh ◽

Giovanni Costantini ◽

Keyword(s):

Cellular Automata ◽

Reaction Diffusion ◽

Square Lattice ◽

Short Term ◽

Statistical Complexity

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Evaluating Phthalate Contaminant Migration Using Thermal Desorption–Gas Chromatography–Mass Spectrometry (TD–GC–MS)

Polymers ◽

10.3390/polym11040683 ◽

2019 ◽

Vol 11 (4) ◽

pp. 683 ◽

Cited By ~ 6

Author(s):

Yukihiro Ouchi ◽

Hiroyuki Yanagisawa ◽

Shigehiko Fujimaki

Keyword(s):

Mass Spectrometry ◽

Gas Chromatography ◽

Thermal Desorption ◽

Gas Chromatography Mass Spectrometry ◽

Approximation Model ◽

Contaminant Migration ◽

Short Term ◽

Small Organic Molecules ◽

Chromatography Mass Spectrometry ◽

Ethylhexyl Phthalate

This study describes a methodology for evaluating regulatory levels of phthalate contamination. By collecting experimental data on short-term phthalate migration using thermal desorption–gas chromatography–mass spectrometry (TD–GC–MS), the migration of di(2-ethylhexyl) phthalate (DEHP) from polyvinyl chloride (PVC) to polyethylene (PE) was found to be expressed by the Fickian approximation model, which was originally proposed for solid (PVC)/liquid (solvent) migration of phthalates. Consequently, good data correlation was obtained using the Fickian approximation model with a diffusion coefficient of 4.2 × 10−12 cm2/s for solid (PVC)/ solid (PE) migration of DEHP at 25 °C. Results showed that temporary contact with plasticized polymers under a normal, foreseeable condition may not pose an immediate risk of being contaminated by phthalates at regulatory levels. However, as phthalates are small organic molecules designed to be dispersed in a variety of polymers as plasticizers at a high compounding ratio, the risk of migration-related contamination can be high in comparison with other additives, especially under high temperatures. With these considerations in mind, the methodology for examining regulatory levels of phthalate contamination using TD–GC–MS has been successfully demonstrated from the viewpoint of its applicability to solid (PVC)/solid (PE) migration of phthalates.

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