The ion-driven permeation experiment PERMEX

Голубева, А. В.; Mayer, M.; Gasparyan, Yu. M.; Roth, J.; Kurnaev, V.А.

doi:10.1063/1.3154385

Cited by 6 publications

(3 citation statements)

References 17 publications

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“…A detailed description of the facility was presented in Ref. 8. A sample (34 mm in diameter) sealed by two gold O-rings (27 mm in diameter) was bombarded by a mono-energetic and massanalyzed deuterium ion beam.…”

Section: A Setup Descriptionmentioning

confidence: 99%

Deuterium permeation through carbon-coated tungsten during ion bombardment

Gasparyan

Mayer

Писарев

et al. 2011

Journal of Applied Physics

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Deuterium permeation during ion bombardment through tungsten membranes coated by amorphous carbon films was investigated and compared with the permeation through bare tungsten. The membrane was bombarded by D3+ ions with energies of 200 and 1200 eV/D at a temperature of 873 K. The thickness of the amorphous carbon film was 120–170 nm. Detailed characterization of the carbon films were performed using AFM, NRA, RBS, FIB/SEM and XPS. The influence of the carbon films on permeation were strong for both ion energies, but different for each energy. In the case of 200 eV/D ions, the film was completely removed by the end of permeation due to intensive chemical sputtering, the lag time of permeation was much longer than for the bare membrane, and the permeation rate rose to a maximum value close to the bare membrane and then decreased to lower values. In the case of 1200 eV/D, the films were sputtered only very slowly, the lag time was much longer than in the case of the bare membrane but shorter than at 200 eV/D, and the permeation rate increased steadily up to several percents of the incident flux.

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Section: A Setup Descriptionmentioning

confidence: 99%

Deuterium permeation through carbon-coated tungsten during ion bombardment

Gasparyan

Mayer

Писарев

et al. 2011

Journal of Applied Physics

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“…The experiments were performed at the PERMEX facility (IPP, Garching), which will be described in details in [7]. The main parts of the facility are: a high current ion source, a magnetic mass-analyzer, a sample unit, a quadrupole mass-spectrometer (QMS), and an ion gun for back surface cleaning by Ar + sputtering.…”

Section: Methodsmentioning

confidence: 99%

Ion-driven deuterium permeation through tungsten at high temperatures

Gasparyan

Голубева

Mayer

et al. 2009

Journal of Nuclear Materials

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“…Thermal desorption spectrometry is available in a dedicated vacuum chamber located below the load-lock for in-vacuo retention studies, though this capability of SIESTA has not yet been tested. The new version of the ion-driven permeation experiment PERMEX [27] is planned for the left exit of the dipole magnet (PERMEX exit in fig. 11).…”

Section: Ion Speciesmentioning

confidence: 99%

SIESTA: A high current ion source for erosion and retention studies

Arredondo

Oberkofler

Schmid

et al. 2018

Review of Scientific Instruments

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SIESTA (Second Ion Experiment for Sputtering and TDS Analysis) is a high-current ion source for erosion and retention studies with focus on wall materials for fusion devices. The system is composed of a DuoPIGatron type ion source, three consecutive grids for ion extraction as well as acceleration and beam focusing, a differential pumping stage, a dipole magnet for mass filtering, a quadrupole doublet lens, a target chamber, a load-lock and a chamber for thermal desorption spectrometry. The potential of the source can be varied between 200 V and 10 kV. The target chamber has a base pressure of 10 −8 mbar, and an operating pressure of 10 −7 − 10 −6 mbar. The target can be rotated to study angle-dependent effects, heated via electron-impact heating up to 1300 K for high temperature erosion and implantation studies. The target chamber is equipped with an in-situ magnetic suspension balance. The operating parameters of the ion source were mapped to achieve the maximum ion current at the target for various gas species and accelerating potentials. The beam emittance for a D + 3 ion beam was measured after deflection in the dipole magnet. This was used for ion beam simulations, which aided the design of the quadrupole lenses. If the quadrupole doublet is used, the ion flux to the target is increased by up to a factor of 4. Additionally, the relative population of neutral particles present in the beam at the target was quantified. The typical beam footprint at the target under normal incidence has an area of 0.5 cm 2. The ion current reaching the target increases with the accelerating potential. Due to this effect, the ion flux density at the target in the low-ion-impact-energy range can be increased by operating the source at a higher extraction potential and by applying a (decelerating) potential to the target, rather than directly operating the ion source at a lower potential. Ion impact energies as low as 200 eV/D are achieved this way with a D + 3 current of 100 µA when focusing the beam with the quadrupole doublet lens, equating to an ion flux density of 3.7 × 10 19 m −2 s −1 with a beam footprint of approximately 0.5 cm 2. At ion impact energies of 2 keV/D, the maximum achievable flux density with D + 3 is 6 × 10 19 m −2 s −1. Experimental determination of sputter yields was performed via in-vacuo and ex-situ weight loss measurement for bulk Au samples, showing reasonably good agreement with simulations and experimental data from literature.

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The ion-driven permeation experiment PERMEX

Cited by 6 publications

References 17 publications

Deuterium permeation through carbon-coated tungsten during ion bombardment

Deuterium permeation through carbon-coated tungsten during ion bombardment

Ion-driven deuterium permeation through tungsten at high temperatures

SIESTA: A high current ion source for erosion and retention studies

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