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排序方式: 共有59条查询结果,搜索用时 15 毫秒
1.
Rostov V. V. Barmin V. V. Landl V. F. Vyhodtsev P. V. Artemov K. P. Stepchenko A. S. 《Russian Physics Journal》2019,62(7):1253-1259
Russian Physics Journal - A wide-aperture (16 cm × 27 cm) source of e-beams for sterilization of plastic packages based on a“SINUS- 320” high-current accelerator with 450 keV... 相似文献
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A high-Q quasi-optical cavity consisting of wealky irregular axisymmetric waveguides is proposed for generation of high-power radiation in a ubitron with a high-current electron beam. The propagation of natural symmetric magnetic waves in an equivalent transmission line is studied for selection of the cavity geometry. The experimental data on electrodynamic mode selection agree with theory.Institute of High-Current Electronics, Siberian Division, Russian Academy of Sciences. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 36, No. 2, pp. 192–200, February, 1993. 相似文献
4.
Moreland L.D. Schamiloglu E. Lemke W. Korovin S.D. Rostov V.V. Roitman A.M. Hendricks K.J. Spencer T.A. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1994,22(5):554-565
The Sinus-6, a high-power relativistic repetitively-pulsed electron beam accelerator, is used to drive various slow wave structures in a BWO configuration in vacuum. Peak output power of about 550 MW at 9.45 GHz was radiated in an 8-ns pulse. We describe experiments which study the relative efficiencies of microwave generation from a two-stage nonuniform amplitude slow wave structure and its variations without an initial stage. Experimental results are compared with 2.5 D particle-in-cell computer simulations. Our results suggest that prebunching the electron beam in the initial section of the nonuniform BWO results in increased microwave generation efficiency, Furthermore, simulations reveal that, in addition to the backward propagating surface harmonic of the TM01 mode, backward and forward propagating volume harmonics with phase velocity twice that of the surface harmonic play an important role in high-power microwave generation and radiation 相似文献
5.
N. S. Ginzburg S. D. Korovin I. V. Pegel V. V. Rostov M. I. Yalandin 《Laser Physics》2006,16(1):79-88
The article presents a review of works (mainly, of experimental ones) on production of subgigawatt and gigawatt microwave
pulses of extremely short duration (5–7 RF periods) using backward-wave systems fed with nanosecond and subnanosecond high-current
electron beams produced by compact accelerators. Theoretical approaches to the generation process (which is essentially non-steady-state)
are briefly summarized. Using the effect of spatial accumulation of energy in a short running microwave pulse allows production
of pulses with peak power notably higher then the driving electron beam power. Compact microwave sources developed for operation
in the Ka-band and X-band are described. Special attention is given to the issue of high pulse repetition frequency operation
of the sources. 相似文献
6.
A. V. Gunin S. A. Kitsanov A. I. Klimov S. D. Korovin I. V. Pegel' S. D. Polevin A. M. Roitman V. V. Rostov A. S. Stepchenko M. Yu. Sukhov 《Russian Physics Journal》1996,39(12):1229-1232
In this paper, we present the results of investigations of a uniform three-centimeter relativistic backward-wave tube (BWT)
with circular waveguide operating mode E01 with pulse power 3 GW and efficiency about 20%. We have obtained a dependence of the radiation pulse duration on the generated
power. We discuss the problems involved in shortening the duration of the microwave pulses in oscillators with high microwave
field intensity on the surface of the slow-wave structure.
Institute of High-Current Electronics, Siberian Branch, Russian Academy of Sciences. Translated from Izvestiya Vysshikh Uchebnykh
Zavedenii, Fizika, No. 12, pp. 84–88, December, 1996. 相似文献
7.
Gunin A.V. Landl V.F. Korovin S.D. Mesyats G.A. Pegel I.V. Rostov V.V. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》2000,28(3):537-541
Operation of explosive-emission cold cathodes made from various materials was studied at a large number of pulses at current densities of ~1.04 A/cm2. The cathode voltage and the beam current were ~500 kV and 5 kA, respectively, with a pulsewidth of ~20 ns. At a small number of pulses (⩽103), cathodes of like geometry (even made from different materials) demonstrated similar emission properties. For most of the materials tested, with a large number of pulses (⩾103), the current risetime increased to the fullwidth of the voltage pulse and the maximum current of the vacuum diode decreased. When using a graphite cathode, the maximum current remained invariant until 108 pulses. Mass losses were measured for a series of cathode materials. The results obtained offered the possibility to realize long-lived operation of an X-band relativistic backward-wave oscillator with an almost invariant output power of 350-400 MW during 108 pulses at a pulse repetition rate of 100-150 p.p.s 相似文献
8.
DC Muddiman AP Null JC Hannis 《Rapid communications in mass spectrometry : RCM》1999,13(12):1201-1204
Electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (ESI-FTICRMS) has been used to determine the mass of a double-stranded 500 base-pair (bp) polymerase chain reaction (PCR) product with an average theoretical mass of the blunt-ended (i.e. unadenylated) species of 308 859.35 Da. The PCR product was generated from the linearized bacteriophage Lambda genome which is a double-stranded template. Utilization of ethanol precipitation in tandem with a rapid microdialysis step to purify and desalt the PCR product was crucial to obtain a precise mass measurement. The PCR product (0.8 pmol/μL) was electrosprayed from a solution containing 75% acetonitrile, 25 mM piperidine, and 25 mM imidazole and was infused at a rate of 200 nL/min. The average molecular mass and the corresponding precision were determined using the charge-states ranging from 172 to 235 net negative charges. The experimental mass and corresponding precision (reported as the 95% confidence interval of the mean) was 309 406 +/- 27 Da (87 ppm). The mass accuracy was compromised due to the fact that the PCR generates multiple products when using Taq polymerase due to the non-template directed 3'-adenylation. This results in a mixture of three PCR products with nearly identical mass (i.e. blunt-ended, mono-adenylated and di-adenylated) with unknown relative abundances that were not resolved in the spectrum. Thus, the experimental mass will be a weighted average of the three species which, under our experimental conditions, reflects a nearly equal concentration of the mono- and di-adenylated species. This report demonstrates that precise mass measurements of PCR products up to 309 kDa (500 bp) can be routinely obtained by ESI-FTICR requiring low femtomole amounts. Copyright 1999 John Wiley & Sons, Ltd. 相似文献
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10.
Sharypov K. A. Shunailov S. A. Ginzburg N. S. Zotova I. V. Romanchenko I. V. Rostov V. V. Ulmasculov M. R. Shpak V. G. Yalandin M. I. 《Radiophysics and Quantum Electronics》2019,62(7-8):447-454
Radiophysics and Quantum Electronics - By simulations and experiments we develop a method for generation phase locking of a Ka-band subgigawatt nonstationary relativistic backward-wave oscillator... 相似文献