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Protasov, Yu. S.

doi:10.1023/a:1023673801469

Cited by 5 publications

(5 citation statements)

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“…In the present study, the attenuation coefficient was estimated by the extrapolation of data calculated with the NIST Attenuation database [43]. A rough estimation of I λ is possible with data on the MPC radiance B λ [22,25,26] as:…”

Section: Discussionmentioning

confidence: 99%

“…A photo of the sample placement (for Mo/Si samples) in the chamber is presented in Figure 1. Generation of compressed plasma flows and the radiation fluxes were carried out with a high-current plasma accelerator (MPC) with a coaxial electrode unit 1 [22,25,26]. The electrodes were made from AISI 321 steel.…”

Section: Methodsmentioning

confidence: 99%

“…Nowadays, high-pressure UV emitters based on compressed plasma flows [20,21] is also under close consideration [22,23]. As an example of such devices, it is possible to consider a coaxial magnetic plasma compressor (MPC) of the erosion type [24].…”

Section: Introductionmentioning

confidence: 99%

“…This leads to the formation of a high-temperature region (a plasma focus) with a brightness temperature of ≈40-100 kK [25]. Such emitters are characterized by a high brightness and extended dimensions of the emission zone [22]. The energy conversion efficiency into radiation is about ≈0.3 [26].…”

Section: Introductionmentioning

confidence: 99%

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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

et al. 2022

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This study discusses the main features of the irradiation of prospective multilayer coatings by VUV/UV radiation from compressed plasma flows. Such radiation is characterized by a broadband spectrum and high brightness fluxes. Oxide and Mo/Si bilayers were used as the basis of the reflective multilayers for the visible and UV ranges. A gas-dynamic response from the irradiated surfaces was studied with schlieren photography. The properties of original and irradiated multilayers were described with ultra violet visible infrared spectroscopy (UV-Vis-IR), X-ray diffraction (XRD), X-ray reflectometry, scanning electron microscopy (SEM) and other techniques. Data on the degradation of optical properties and surface morphology were obtained.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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

et al. 2022

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“…As an example, CubeSat miniaturized satellites [16] with pulsed plasma thrusters [17] could be used as prospective and inexpensive space observatories, which can serve the needs of universities and small research teams. Such plasma devices ensure high radiation loads (up to q s ≈ 1 MW/cm 2 ) on irradiated surfaces and the generation of broadband VUV radiation [18], which presents these devices as unequal laboratory tools for degradation tests and the material sciences. The radiation sources, based on a coaxial magnetic plasma compressor (MPC) [19], can obtain ultra-high brightness plasma temperatures of ≥40 kK [20].…”

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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Study of optical and structural properties of radiation-resistant HfO2/SiO2 and ZrO2/SiO2 Multilayers

Skryabin

Chesnokov

Новиков

et al. 2022

INTERNATIONAL CONFERENCE ON INFORMATICS, TECHNOLOGY, AND ENGINEERING 2021 (InCITE 2021): Leveraging Smart Engineering

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Cited by 5 publications

References 0 publications

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

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

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

Study of optical and structural properties of radiation-resistant HfO2/SiO2 and ZrO2/SiO2 Multilayers

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