33 research outputs found
Relaxation of a relativistic electron beam in plasma in the trapping regime
A model for collective relaxation of high-power relativistic electron beams in plasmas is proposed, which describes beam-plasma interaction in the regime when amplitudes of unstable waves are large enough to trap beam electrons. The model predicts profiles of energy release along the plasma column in a good quantitative agreement with experimental measurements.ΠΠ°ΠΏΡΠΎΠΏΠΎΠ½ΠΎΠ²Π°Π½ΠΎ ΠΌΠΎΠ΄Π΅Π»Ρ ΠΊΠΎΠ»Π΅ΠΊΡΠΈΠ²Π½ΠΎΡ ΡΠ΅Π»Π°ΠΊΡΠ°ΡΡΡ ΠΏΠΎΡΡΠΆΠ½ΠΎΠ³ΠΎ ΡΠ΅Π»ΡΡΠΈΠ²ΡΡΡΡΡΠΊΠΎΠ³ΠΎ Π΅Π»Π΅ΠΊΡΡΠΎΠ½Π½ΠΎΠ³ΠΎ ΠΏΡΡΠΊΠ°, ΡΠΊΠ° ΠΎΠΏΠΈΡΡΡ Π²Π·Π°ΡΠΌΠΎΠ΄ΡΡ ΠΏΡΡΠΊΠ° Π· ΠΏΠ»Π°Π·ΠΌΠΎΡ Π² ΡΠ΅ΠΆΠΈΠΌΡ, ΠΏΡΠΈ ΡΠΊΠΎΠΌΡ Π΅Π½Π΅ΡΠ³ΡΡ Π½Π΅ΡΡΡΠΉΠΊΠΈΡ
ΠΊΠΎΠ»ΠΈΠ²Π°Π½Ρ Π²ΠΈΡΠ²Π»ΡΡΡΡΡΡ Π΄ΠΎΡΡΠ°ΡΠ½ΡΠΎΡ Π΄Π»Ρ Π·Π°Ρ
ΠΎΠΏΠ»Π΅Π½Π½Ρ Π΅Π»Π΅ΠΊΡΡΠΎΠ½ΡΠ² ΠΏΡΡΠΊΠ°. ΠΠΎΠ΄Π΅Π»Ρ ΠΏΠ΅ΡΠ΅Π΄Π±Π°ΡΠ°Ρ ΠΏΡΠΎΡΡΠ»Ρ Π΅Π½Π΅ΡΠ³ΠΎΠ²ΠΈΠ΄ΡΠ»Π΅Π½Π½Ρ ΠΏΡΡΠΊΠ° Π² ΠΏΠ»Π°Π·ΠΌΡ ΠΏΠΎ Π΄ΠΎΠ²ΠΆΠΈΠ½Ρ ΡΡΡΠ°Π½ΠΎΠ²ΠΊΠΈ, ΡΠΊΡ Π·Π½Π°Ρ
ΠΎΠ΄ΡΡΡΡΡ Π² Π³Π°ΡΠ½ΡΠΉ ΠΊΡΠ»ΡΠΊΡΡΠ½ΡΠΉ Π·Π³ΠΎΠ΄Ρ Π· Π΅ΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΠΈΠΌΠΈ Π΄Π°Π½ΠΈΠΌΠΈ.ΠΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½Π° ΠΌΠΎΠ΄Π΅Π»Ρ ΠΊΠΎΠ»Π»Π΅ΠΊΡΠΈΠ²Π½ΠΎΠΉ ΡΠ΅Π»Π°ΠΊΡΠ°ΡΠΈΠΈ ΠΌΠΎΡΠ½ΠΎΠ³ΠΎ ΡΠ΅Π»ΡΡΠΈΠ²ΠΈΡΡΡΠΊΠΎΠ³ΠΎ ΡΠ»Π΅ΠΊΡΡΠΎΠ½Π½ΠΎΠ³ΠΎ ΠΏΡΡΠΊΠ°, ΠΎΠΏΠΈΡΡΠ²Π°ΡΡΠ°Ρ Π²Π·Π°ΠΈΠΌΠΎΠ΄Π΅ΠΉΡΡΠ²ΠΈΠ΅ ΠΏΡΡΠΊΠ° Ρ ΠΏΠ»Π°Π·ΠΌΠΎΠΉ Π² ΡΠ΅ΠΆΠΈΠΌΠ΅, ΠΏΡΠΈ ΠΊΠΎΡΠΎΡΠΎΠΌ ΡΠ½Π΅ΡΠ³ΠΈΡ Π½Π΅ΡΡΡΠΎΠΉΡΠΈΠ²ΡΡ
ΠΊΠΎΠ»Π΅Π±Π°Π½ΠΈΠΉ ΠΎΠΊΠ°Π·ΡΠ²Π°Π΅ΡΡΡ Π΄ΠΎΡΡΠ°ΡΠΎΡΠ½ΠΎΠΉ Π΄Π»Ρ Π·Π°Ρ
Π²Π°ΡΠ° ΡΠ»Π΅ΠΊΡΡΠΎΠ½ΠΎΠ² ΠΏΡΡΠΊΠ°. ΠΠΎΠ΄Π΅Π»Ρ ΠΏΡΠ΅Π΄ΡΠΊΠ°Π·ΡΠ²Π°Π΅Ρ ΠΏΡΠΎΡΠΈΠ»ΠΈ ΡΠ½Π΅ΡΠ³ΠΎΠ²ΡΠ΄Π΅Π»Π΅Π½ΠΈΡ ΠΏΡΡΠΊΠ° Π² ΠΏΠ»Π°Π·ΠΌΠ΅ ΠΏΠΎ Π΄Π»ΠΈΠ½Π΅ ΡΡΡΠ°Π½ΠΎΠ²ΠΊΠΈ, ΠΊΠΎΡΠΎΡΡΠ΅ Π½Π°Ρ
ΠΎΠ΄ΡΡΡΡ Π² Ρ
ΠΎΡΠΎΡΠ΅ΠΌ ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎΠΌ ΡΠΎΠ³Π»Π°ΡΠΈΠΈ Ρ ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΡΠΌΠΈ Π΄Π°Π½Π½ΡΠΌΠΈ
Hybrid Tamm-cavity modes in photonic crystal with resonant nanocomposite defect layer
Hybrid optical modes in a one-dimensional photonic crystal with a resonant nanocomposite defect bounded by a metallic layer are studied. The nanocomposite consists of spherical metallic constituents, that are distributed in a dielectric matrix. Transmittance, reflectance, and absorbance spectra of this structure, which is shined by light with normal incidence, are calculated. The possibility of control of the hybrid modes spectral characteristics by changing the thickness of the layer adjacent to the metal, the number of layers, and the nanocomposite filling factor is shown.This research was funded by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research Project No 18-42-243025
Long-lived magnetoexcitons in 2D-fermion system
The paper addresses the experimental technique that, when applied to a 2D-electron system in the integer quantum Hall regime with filling factor Ξ½β=β2 (the Hall insulating state), allows resonant excitation of magnetoexcitons, their detection, control of an ensemble of long-lived triplet excitons and investigation of their radiationless decay related to exciton spin relaxation into the ground state. The technique proposed enables independent control of photoexcited electrons and Fermi-holes using photoinduced resonance reflection spectra as well as estimate with a reasonable degree of accuracy the resulting density of photoinduced electron-hole pairs bound into magnetoexcitons. The mere existence of triplet excitons was directly established by inelastic light scattering spectra which were analyzed to determine the value of singlet-triplet exciton splitting. It was found that the lifetimes of triplet excitons conditioned by electron spin relaxation in highly perfect GaAs/AlGaAs heterostructures with highly mobile 2D electrons are extremely long exceeding 100β ΞΌs at Tβ<β1βK. The paper presents a qualitative explanation of the long-spin relaxation lifetimes which are unprecedented for translation-invariant 2D systems. This enabled us to create sufficiently high concentrations of triplet magnetoexcitons, electrically neutral excitations following BoseβEinstein statistics, in a Fermi electron system and investigate their collective properties. At sufficiently high densities of triplet magnetoexcitons and low temperatures, Tβ<β1βK, the degenerate magnetofermionic system exhibits condensation of the triplet magnetoexcitons into a qualitatively new collective state with unusual properties which occurs in the space of generalized moments (magnetic translation vectors). The occurrence of a condensed phase is accompanied with a significant decrease in the viscosity of the photoexcited system, which is responsible for electron spin transport at macroscopic distances, as well as with the effects of threshold enhancement of the system response to the external action of the electromagnetic field and emergence of a new intensive radiative recombination channel
Research of the thermal desorption processes in oxide mixtures at laser effect
To investigate the physical-chemical processes occurring during the heating stage of spent nuclear fuel magneto plasma reprocessing a study of thermal desorption of oxides and oxide mixtures as SNF simulators under the influence of stationary laser radiation are being studied. Preliminary experiments were carried out. X-ray diffraction and energy dispersive X-ray microanalysis of the film deposited on the substrate after laser influence on a mixture of BβOβ/ZrOβ oxides have been performed.ΠΠ»Ρ Π²ΠΈΠ²ΡΠ΅Π½Π½Ρ ΡΡΠ·ΠΈΠΊΠΎ-Ρ
ΡΠΌΡΡΠ½ΠΈΡ
ΠΏΡΠΎΡΠ΅ΡΡΠ², ΡΠΎ Π²ΡΠ΄Π±ΡΠ²Π°ΡΡΡΡΡ Π½Π° ΡΡΠ°Π΄ΡΡ Π½Π°Π³ΡΡΠ²Ρ ΠΌΠ°Π³Π½ΡΡΠΎΠΏΠ»Π°Π·ΠΌΠΎΠ²ΠΎΡ ΠΏΠ΅ΡΠ΅ΡΠΎΠ±ΠΊΠΈ Π²ΡΠ΄ΠΏΡΠ°ΡΡΠΎΠ²Π°Π½ΠΎΠ³ΠΎ ΡΠ΄Π΅ΡΠ½ΠΎΠ³ΠΎ ΠΏΠ°Π»ΠΈΠ²Π° (ΠΠ―Π), ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΡΡΡΡ Π΄ΠΎΡΠ»ΡΠ΄ΠΆΠ΅Π½Π½Ρ ΠΏΡΠΎΡΠ΅ΡΡΠ² ΡΠ΅ΡΠΌΠΎΠ΄Π΅ΡΠΎΡΠ±ΡΡΡ ΠΎΠΊΡΠΈΠ΄ΡΠ² Ρ ΠΎΠΊΡΠΈΠ΄Π½ΠΈΡ
ΡΡΠΌΡΡΠ΅ΠΉ - ΡΠΌΡΡΠ°ΡΠΎΡΡΠ² ΠΠ―Π ΠΏΡΠΈ Π²ΠΏΠ»ΠΈΠ²Ρ ΡΡΠ°ΡΡΠΎΠ½Π°ΡΠ½ΠΎΠ³ΠΎ Π»Π°Π·Π΅ΡΠ½ΠΎΠ³ΠΎ Π²ΠΈΠΏΡΠΎΠΌΡΠ½ΡΠ²Π°Π½Π½Ρ. ΠΡΠΎΠ²Π΅Π΄Π΅Π½ΠΎ ΠΏΠΎΠΏΠ΅ΡΠ΅Π΄Π½Ρ Π΅ΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠΈ, Π²ΠΈΠΊΠΎΠ½Π°Π½Ρ ΡΠ΅Π½ΡΠ³Π΅Π½ΠΎΠ΄ΠΈΡΡΠ°ΠΊΡΡΠΉΠ½ΠΈΠΉ Ρ Π΅Π½Π΅ΡΠ³ΠΎΠ΄ΠΈΡΠΏΠ΅ΡΡΡΠΉΠ½ΠΈΠΉ ΡΠ΅Π½ΡΠ³Π΅Π½ΡΠ²ΡΡΠΊΠΈΠΉ ΠΌΡΠΊΡΠΎΠ°Π½Π°Π»ΡΠ·ΠΈ ΠΏΠ»ΡΠ²ΠΊΠΈ, ΠΎΡΠ°Π΄ΠΆΠ΅Π½ΠΎΡ Π½Π° ΠΏΡΠ΄ΠΊΠ»Π°Π΄ΠΊΡ ΠΏΡΡΠ»Ρ Π»Π°Π·Π΅ΡΠ½ΠΎΠ³ΠΎ Π²ΠΏΠ»ΠΈΠ²Ρ Π½Π° ΡΡΠΌΡΡ ΠΎΠΊΡΠΈΠ΄ΡΠ² BβOβ/ZrOβ.ΠΠ»Ρ ΠΈΠ·ΡΡΠ΅Π½ΠΈΡ ΡΠΈΠ·ΠΈΠΊΠΎ-Ρ
ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΏΡΠΎΡΠ΅ΡΡΠΎΠ², ΠΏΡΠΎΠΈΡΡ
ΠΎΠ΄ΡΡΠΈΡ
Π½Π° ΡΡΠ°Π΄ΠΈΠΈ Π½Π°Π³ΡΠ΅Π²Π° ΠΌΠ°Π³Π½ΠΈΡΠΎΠΏΠ»Π°Π·ΠΌΠ΅Π½Π½ΠΎΠΉ ΠΏΠ΅ΡΠ΅ΡΠ°Π±ΠΎΡΠΊΠΈ ΠΎΡΡΠ°Π±ΠΎΡΠ°Π²ΡΠ΅Π³ΠΎ ΡΠ΄Π΅ΡΠ½ΠΎΠ³ΠΎ ΡΠΎΠΏΠ»ΠΈΠ²Π° (ΠΠ―Π’), ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΡΡΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠ΅ ΡΠ΅ΡΠΌΠΎΠ΄Π΅ΡΠΎΡΠ±ΡΠΈΠΈ ΠΎΠΊΡΠΈΠ΄ΠΎΠ² ΠΈ ΠΎΠΊΡΠΈΠ΄Π½ΡΡ
ΡΠΌΠ΅ΡΠ΅ΠΉ β ΠΈΠΌΠΈΡΠ°ΡΠΎΡΠΎΠ² ΠΠ―Π’ ΠΏΡΠΈ Π²ΠΎΠ·Π΄Π΅ΠΉΡΡΠ²ΠΈΠΈ ΡΡΠ°ΡΠΈΠΎΠ½Π°ΡΠ½ΠΎΠ³ΠΎ Π»Π°Π·Π΅ΡΠ½ΠΎΠ³ΠΎ ΠΈΠ·Π»ΡΡΠ΅Π½ΠΈΡ. ΠΡΠΎΠ²Π΅Π΄Π΅Π½Ρ ΠΏΡΠ΅Π΄Π²Π°ΡΠΈΡΠ΅Π»ΡΠ½ΡΠ΅ ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΡ, Π²ΡΠΏΠΎΠ»Π½Π΅Π½Ρ ΡΠ΅Π½ΡΠ³Π΅Π½ΠΎΠ΄ΠΈΡΡΠ°ΠΊΡΠΈΠΎΠ½Π½ΡΠΉ ΠΈ ΡΠ½Π΅ΡΠ³ΠΎΠ΄ΠΈΡΠΏΠ΅ΡΡΠΈΠΎΠ½Π½ΡΠΉ ΡΠ΅Π½ΡΠ³Π΅Π½ΠΎΠ²ΡΠΊΠΈΠΉ ΠΌΠΈΠΊΡΠΎΠ°Π½Π°Π»ΠΈΠ·Ρ ΠΏΠ»Π΅Π½ΠΊΠΈ, ΠΎΡΠ°ΠΆΠ΄Π΅Π½Π½ΠΎΠΉ Π½Π° ΠΏΠΎΠ΄Π»ΠΎΠΆΠΊΡ ΠΏΡΠΈ Π»Π°Π·Π΅ΡΠ½ΠΎΠΌ Π²ΠΎΠ·Π΄Π΅ΠΉΡΡΠ²ΠΈΠΈ Π½Π° ΡΠΌΠ΅ΡΡ ΠΎΠΊΡΠΈΠ΄ΠΎΠ² BβOβ/ZrOβ