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- Farkas, B., et al.
(author)
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Optical, compositional and structural properties of pulsed laser deposited nitrogen-doped Titanium-dioxide
- 2018
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In: Applied Surface Science. - : Elsevier BV. - 0169-4332 .- 1873-5584. ; 433, s. 149-154
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Journal article (peer-reviewed)abstract
- N-doped TiO2 thin films were prepared using pulsed laser deposition by ablating metallic Ti target with pulses of 248 nm wavelength, at 330 °C substrate temperature in reactive atmospheres of N2/O2 gas mixtures. These films were characterized by spectroscopic ellipsometry, X-ray photoelectron spectroscopy and X-ray diffraction. Optical properties are presented as a function of the N2 content in the processing gas mixture and correlated to nitrogen incorporation into the deposited layers. The optical band gap values decreased with increasing N concentration in the films, while a monotonically increasing tendency and a maximum can be observed in case of extinction coefficient and refractive index, respectively. It is also shown that the amount of substitutional N can be increased up to 7.7 at.%, but the higher dopant concentration inhibits the crystallization of the samples.
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- Pokol, Gergö, 1979, et al.
(author)
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Quasi-linear analysis of the extraordinary electron wave destabilized by runaway electrons
- 2014
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In: Physics of Plasmas. - : AIP Publishing. - 1089-7674 .- 1070-664X. ; 21:10, s. 102503-
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Journal article (peer-reviewed)abstract
- Runaway electrons with strongly anisotropic distributions present in post-disruption tokamak plasmas can destabilize the extraordinary electron (EXEL) wave. The present work investigates the dynamics of the quasi-linear evolution of the EXEL instability for a range of different plasma parameters using a model runaway distribution function valid for highly relativistic runaway electron beams produced primarily by the avalanche process. Simulations show a rapid pitch-angle scattering of the runaway electrons in the high energy tail on the 100–1000 μs time scale. Due to the wave-particle interaction, a modification to the synchrotron radiation spectrum emitted by the runaway electron population is foreseen, exposing a possible experimental detection method for such an interaction.
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