Main Catalog Physics Physics and technology of nanostructures, nuclear and molecular

Simulating sodium redistribution in the proton-irradiated protective glass layer of the spacecraft solar panels

Authors: Kuznetsov I.S.
Published in issue: #5(94)/2024
DOI:
Category: Physics \| Chapter: Physics and technology of nanostructures, nuclear and molecular
Keywords: irradiation, K-208 glass, injected charge, ion field migration, atomic force microscopy, gas-filled bubbles
Published: 17.11.2024

The paper proposes a model that describes the sodium ions field migration process, which plays a key role in the glass microstructure reorganization, to interpret experimental results of irradiating glass containing the sodium and potassium oxides with the 40 keV protons. The TITAN 80-300 transmission/scanning electron microscope (T/SEM) was used to measure sodium concentration in the near-surface glass layers to protons. Results of measurements and computation show that, migration into the field of a charge injected into the glass results in the sodium ions migration from the zone of the thermalized protons maximum distribution to the irradiated glass surface. To consider the process of the sodium ion redistribution in glass, the paper proposes to use a mathematical model of the drift-diffusion problem. It is solved in the near-surface region of a glass sample irradiated with the protons until the drift and diffusion flows are equalized. The obtained simulation results demonstrate that the flows equality under the considered conditions is achieved after a time interval of approximately 1.5 hours. In this case, the sodium ions equilibrium concentration at the outer surface of the irradiated sample is directly proportional to the radiation-induced electric field inside the sample.

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