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A versatile setup for hydrogen isotope permeation studies.

P Sand^1,2, A Manhard², U von Toussaint²

¹Technische Universität München, Boltzmannstrasse 15, Garching D-85748, Germany.

The Review of Scientific Instruments

|December 11, 2024

Summary

This summary is machine-generated.

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The Testbed for Analysis of Permeation of Atoms in Samples (TAPAS) enables studying ion-driven permeation in nuclear fusion wall materials. Experiments on tungsten foils confirmed diffusion-limited boundary conditions under relevant fusion reactor conditions.

Area of Science:

Nuclear Fusion Engineering
Materials Science
Plasma Physics

Background:

Investigating plasma-facing wall materials is crucial for nuclear fusion reactor development.
Understanding hydrogen isotope permeation through these materials is essential for reactor safety and performance.

Purpose of the Study:

To introduce the Testbed for Analysis of Permeation of Atoms in Samples (TAPAS) experimental setup.
To characterize TAPAS capabilities for simulating fusion reactor plasma-wall interactions.
To validate the setup using benchmark experiments on tungsten.

Main Methods:

Utilizing a monoenergetic, mass-filtered keV ion beam with electrostatic optics for precise ion energy control.
Employing a deceleration system to achieve low ion energies (e.g., 170 eV/D) and high flux densities (10^20 D/m^2s).

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Conducting experiments in ultra-high vacuum with sample heating up to 1000 K and detecting permeating isotopes via quadrupole mass spectrometry.

Main Results:

Achieved low ion energies and high flux densities representative of fusion reactor first-wall conditions, avoiding target sputtering.
Demonstrated TAPAS capability for both ion-driven and limited gas-driven permeation studies.
Benchmark experiments on tungsten foils reached diffusion-limited boundary conditions, validating the setup's accuracy.

Conclusions:

TAPAS is a well-calibrated experimental facility for studying ion-driven hydrogen isotope permeation in fusion materials.
The setup provides a reliable platform for investigating material responses under simulated fusion reactor plasma exposure.
Results confirm the suitability of TAPAS for advancing nuclear fusion materials research.