Experimental Study of Irradiation of Thin Oxide and Mo/Si Multilayers by High Brightness Broadband VUV/UV Radiation and Their Degradation

Telekh, V. D.; Pavlov, A. V.; Kirillov, D. V.; Vorob’ev, E. V.; Turyanskiy, A. G.; Senkov, Viacheslav M.; Цыганков, П. А.; Parada-Becerra, Freddy F.; Vesnin, V. R.; Skryabin, A. S.

doi:10.3390/coatings12020290

Cited by 6 publications

(7 citation statements)

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“…UV/VUV exposure in neon with the maximum quanta energy of 21.56 eV (discharge in neon) led to a significant surface degradation [1]. Surface erosion was detected.…”

Section: Resultsmentioning

confidence: 99%

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Interaction of powerful plasma jets with Mo/Si multilayers

Skryabin

Telekh

Pavlov

et al. 2022

J. Phys.: Conf. Ser.

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“…UV/VUV exposure in neon with the maximum quanta energy of 21.56 eV (discharge in neon) led to a significant surface degradation [1]. Surface erosion was detected.…”

Section: Resultsmentioning

confidence: 99%

“…The high current emitters based on compressed plasma jets are sources of powerful broadband radiation (with fluxes of ≈10 20 -10 22 photon/s per a single pulse) [1]. Ponderomotive forces lead to formation of a high temperature plasma focus with a brightness temperature of ≈30-100 kK [2].…”

Section: Introductionmentioning

confidence: 99%

Interaction of powerful plasma jets with Mo/Si multilayers

Skryabin

Telekh

Pavlov

et al. 2022

J. Phys.: Conf. Ser.

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“…The MPC-based emitters have a high efficiency of ≈0.3 [25] and they are suitable as a laboratory tool for experimental studies of material stability under extreme radiation loads with minimal mechanical impacts from plasma. A typical discharge time is about ≈40-50 µs [21].…”

Section: Plasma Radiation Emittermentioning

confidence: 99%

“…The radiation sources, based on a coaxial magnetic plasma compressor (MPC) [19], can obtain ultra-high brightness plasma temperatures of ≥40 kK [20]. Such extreme radiation loads induce evaporation of the coating and the emergence of heat stresses and local defects; they stimulate phase and chemical transformations and other changes in irradiated coatings [21,22]. So, the goals of the present study were an experimental estimation of Al/MgF 2 mirror stability and an understanding of the degradation mechanisms under exposure to powerful and ultra-high-brightness VUV radiation on the surfaces located in the near-field zone of the plasma thruster channel.…”

Section: Introductionmentioning

confidence: 99%

Surface Degradation of Thin-Layer Al/MgF2 Mirrors under Exposure to Powerful VUV Radiation

Skriabin,

Telekh,

Pavlov

et al. 2023

Nanomaterials

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Thin-layer Al/MgF2 coatings are currently used for extraterrestrial far-UV astronomy as the primary and secondary mirrors of telescopes (such as “Spektr-UF”). Successful Hubble far-UV measurements have been performed thanks to MgF2 on Al mirror coatings. Damage of such thin-layer coatings has been previously studied under exposure to high-energy electrons/protons fluxes and in low Earth orbit environments. Meanwhile, there is an interest to test the stability of such mirrors under the impact of extreme radiation fluxes from pulsed plasma thrusters as a simulation of emergency onboard situations and other applications. In the present studies, the high current and compressed plasma jets were generated by a laboratory plasma thruster prototype and operated as effective emitters of high brightness (with an integral overall wavelength radiation flux of >1 MW/cm2) and broadband radiation. The spectrum rearrangement and hard-photon cut-off at energy above Ec were implemented by selection of a background gas in the discharge chamber. The discharges in air (Ec ≈ 6 eV), argon (Ec ≈ 15 eV) and neon (Ec ≈ 21 eV) were studied. X-ray diffraction and reflectometry, electron and atomic force microscopy, and IR and visible spectroscopy were used for coating characterization and estimation of degradation degree. In the case of the discharges in air with photon energies of E < 6 eV, only individual nanocracks were found and property changes were negligible. In the case of inert gases, the energy fraction was ≈50% in the VUV range. As found for inert background gases, an emission of such hard photons with energies higher than the MgF2 band gap energy of ≈10.8 eV caused a drastic light-induced ablation and degradation of the irradiated coatings. The upward trend of degradation with an increasing of the maximum photon energies was detected. The obtained data on the surface destruction are useful for the design of methods for coating stability tests and an understanding of the consequences of emergencies onboard space research stations.

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“…At the same time, data on polymer ablation under such extreme environment are practically absent in the literature. Besides, such studies are further complicated by the complexity of the radiation sources [ 19 , 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Gas Dynamics Processes above the Polymers Surface under Irradiation with Broadband High-Brightness Radiation in the Vacuum Ultraviolet Spectrum Region

et al. 2022

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Obtaining new data on the gas-dynamic responses from the polymer samples (polytetrafluoroethylene, PTFE) irradiated by powerful VUV radiation from compressed plasma flows is in the focus of the present study. An erosion type magnetoplasma compressor (MPC), a type of plasma focus discharge, was used as a radiation source. The operating voltages of the MPC were between 15 and 25 kV, the maximum measured discharge current was 200 kA, and the radiation energy in the VUV range was ≈1–2 kJ. The VUV fluxes on the sample surface were high and equal to ≈1022–1024 photons cm−2·s−1. Double-exposure laser holographic interferometry and schlieren photography were used to diagnose and visualize the gas-dynamic structures. The spatial distribution of the parameters (temperature, pressure and concentrations of electrons and ions) was defined based on the assumption of local thermodynamic equilibrium. It has been demonstrated that the maximum temperature ranged from ≈ 10 to 15 kK in the plasma layer. The electron concentration was ≈ (0.7–1.6) × 1018 cm−3 in this region. The used techniques of optical diagnostics and procedures of result processing make it possible to obtain data on the dynamics of polymer ablation, which occurs when their surface is exposed to powerful energy fluxes (thermal, shock-wave, radiation, and other extreme loads).

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Experimental Study of Irradiation of Thin Oxide and Mo/Si Multilayers by High Brightness Broadband VUV/UV Radiation and Their Degradation

Cited by 6 publications

References 50 publications

Interaction of powerful plasma jets with Mo/Si multilayers

Interaction of powerful plasma jets with Mo/Si multilayers

Surface Degradation of Thin-Layer Al/MgF2 Mirrors under Exposure to Powerful VUV Radiation

Gas Dynamics Processes above the Polymers Surface under Irradiation with Broadband High-Brightness Radiation in the Vacuum Ultraviolet Spectrum Region

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