http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
I. V. Zotova,N. S. Ginzburg,A. S. Sergeev,M. I. Yalandin,A. G. Reutova,M. R. Ulmaskulov,A. K. Sharypov,S. A. Shunailov 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.61
The first experiments on observation of amplification of ultrashort microwave superradiance (SR) pulses under propagating along quasistationary electron beams were performed. For this purpose experimental set-up based on two high current accelerators RADAN synchronized with accuracy 100-300 ps was build up. The first accelerator was used to drive the 37 GHz generator of superradiance pulses with duration ~300 ps based on relativistic BWO. The second accelerator with current up to 1.2 kA and electron energy ~300 keV drives the amplification section in the form of dielectric loaded waveguide. According to theoretical analysis amplification of electromagnetic pulses (minimum in 4 times on power) was accompanied by significant shortening of SR pulse duration fewer than 100 ps.
A. G. Reutova,S. A. Shunaylov,M. I. Yalandin,M. B. Bochkarev,K. A. Bereznoy,A. S. Nasibov 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.61
In our previous research laser generation peculiarities in different semiconductor A2B6 materials (CdS, ZnSe, ZnCdS) under the action of high-current picosecond electron beams were investigated. Laser radiation is observed in the specified materials due to electric field. Radiation appears with the application of a high-voltage pulses (voltage to 200 kV, duration ~150 – 300 ps) to the sample and has a threshold character. The generation areas are shown to be localized near the sample surface,and radiation duration is from 60 to 100 ps. The radiation power in the case of electric-field-pulse excitation could exceed 10 kW.
S. A. Shunailov,A. G. Reutova,V. G. Shpak,M. I. Yalandin,G. A. Mesyats 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.61
This work aims to determine the energy spectrum bands for a picosecond runaway electron beam (REB) formed and accelerated in an atmospheric gap with a nonuniform E-field. In experiments in which a current/charge was registered after a runaway electron beam had passed absorbing filters made with foils within a four-order range, the absence of any electrons possessing anomalously high energies was demonstrated. Achievable energies did not exceed the values corresponding to the mode of free electrons acceleration in a vacuum by dynamic-growing E-field and were strictly limited by using the cathode voltage. The method of smooth variation of the accelerating voltage amplitude confirmed that the E-field strength required for thermal electrons to transit into the continuous acceleration region in air corresponds to widely-use classical criteria.
Marat Ulmaskulov,V. G. Shpak,S. A. Shunailov,K. A. Sharypov,M. I. Yalandin 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.61
Two active formers of high-voltage subnanosecond unidirectional and monocycle pulses based on an energy compression scheme of a nanosecond pulse and two compact designs of passive stubs with oil insulation are presented. The pulse of the RADAN-303 (driver) initial generator with an amplitude of -145 kV and a duration of a ∼4 ns in one case was converted by the active former to a monocycle pulse (one period of sinusoid) with an amplitude drop of ∼350 kV and a period of ∼−1.25 ns. The unidirectional pulse former allowed a maximum amplitude of ∼290 kV to be reached in 0.3 ns (FWHM), and with additional compression energy, the average amplitude amounted to 310 kV. The electrical strength of the compact passive stubs was sufficient to convert an unidirectional pulse with an amplitude of −180 kV and a pulse width of 0.5 ns (FWHM) to a monocycle pulse with a drop of peak-to-peak amplitude of −150 kV and a drop duration of 0.5 ns for repetition rates up to 3 kHz.