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排序方式: 共有137条查询结果,搜索用时 46 毫秒
1.
A. Noda S. Nakamura Y. Iwashita S. Sakabe M. Hashida T. Shirai S. Shimizu H. Tongu H. Ito H. Souda A. Yamazaki M. Tanabe H. Daido M. Mori M. Kado A. Sagisaka K. Ogura M. Nishiuchi S. Orimo Y. Hayashi A. Yogo S. Bulanov T. Esirkepov A. Nagashima T. Kimura T. Tajima T. Takeuchi K. Matsukado A. Fukumi Z. Li 《Laser Physics》2006,16(4):647-653
In order to widely spread out particle beams utilized in cancer therapy, laser-produced ions are developed as the injection beam for an ion synchrotron dedicated for cancer therapy. Such a laser ion source is expected to contribute largely to the realization of compactness of the size and low cost of the cancer therapy accelerator. The energy spectrum of the laser-produced ions, however, has no peak, but their intensities decrease exponentially according to the increase of the energy. For the purpose of modifying such a situation, we have proposed a scheme to rotate the beam in the longitudinal phase space with the use of the RF electric field, which is phase-adjusted with the pulse laser. We aim for a reduction of the energy spread of ± 5% selected by an energy analyzer and slits to ±1% by such phase rotation. For this purpose, a quarter wavelength resonator with two gaps with the same resonant frequency as the source laser has already been fabricated, together with its RF power source. The above phase rotation system and its recent experimental realization are presented. 相似文献
2.
Simulation of electron bunch generation by an ultrashort-pulse high-intensity laser-driven wakefield
M. Yamagiwa S. V. Bulanov T. Zh. Esirkepov J. Koga M. Kando Y. Ueshima K. Saito D. Wakabayashi 《Laser Physics》2006,16(2):252-258
Electron acceleration due to a wakefield excited by a ultrashort-pulse intense laser propagating through a finite-length underdense plasma layer is studied by two-dimensional particle-in-cell simulation. The electron energy distribution is analyzed for moderate to high intensity. For the electron density, where the pulse length is almost half of the plasma wavelength, dramatic changes of the density structure occur with cavity and bunch formation with an increase in the laser intensity, also leading to the appearance of a fast electron component well confined in phase space. The analytical form of the fast electron energy spectrum is also presented. 相似文献
3.
Bulanov M. N. Sosonyuk S. E. Zyk N. V. Zefirov N. S. 《Russian Journal of Organic Chemistry》2003,39(3):415-421
Opening of the aziridine ring in 3-bromo-1-alkyl-1-azoniatricyclo[2.2.1.02,6]heptane bromides by the action of various nucleophiles leads to formation of the corresponding 6-substituted 2-alkyl-2-azabicyclo[2.2.1]heptanes. 相似文献
4.
Bulanov A. O. Luk'yanov B. S. Kogan V. A. Stankevich N. V. Lukov V. V. 《Russian Journal of Coordination Chemistry》2002,28(1):46-49
Imine- and hydrazone-based metal chelates containing a spiropyran fragment derived from 3-methyl-4-oxo[2H]-1,3-benzoxazinone were prepared. Attempts are made to monitor the photochromic activity of spiropyran using nontraditional -acceptor substituents (products of condensation of the formyl group in 6"-dimethyl-8"-formylspiro-(4-oxo-3,4-dihydro-2H-1,3-benzoxazine-2,2"-[2H]chromene) with o- aminophenol and aromatic acid hydrazides) and using transition metal ions. 相似文献
5.
Russian Journal of Applied Chemistry - New approach is described to synthesis of biomimetic materials on the basis of hydroxyapatite particles and collagen suspension produced from fish-production... 相似文献
6.
7.
L. D. Popov A. O. Bulanov E. A. Raspopova A. N. Morozov I. N. Scherbakov O. I. Kobeleva T. M. Valova V. A. Barachevskii 《Russian Journal of General Chemistry》2013,83(6):1111-1116
A series of new hydrazones based on 3,3-dimethyl-7-hydroxy-8-formyl-[2H]-1-benzopyran-2,1-[2]-oxaindane] with the substituents of different nature in the hydrazone moiety was synthesized. A comparative study of photochromism and complexation of the synthesized spiropyrans with a number of metal cations was carried out. Spectral and kinetic differences in photochromism and complexation of these compounds were revealed. 相似文献
8.
S. S. Bulanov R. U. Esiev A. S. Kamrukov N. P. Kozlov M. I. Morozov I. A. Roslyakov 《Technical Physics》2010,55(11):1633-1640
The results of experimental study of explosive radiation sources based on pulsed injection of a cumulative plasma jet into
atmospheric air are considered. The injection process is accompanied with intense vortex formation as well as the formation
of a large-scale toroidal plasma vortex. High-power electromagnetic radiation in the optical range is generated due to shock-wave
processes during deceleration of a plasma jet in air and plasma-chemical processes in the vortex. The temporal structure of
a radiation pulse being generated contains components from the micro- and millisecond range. For a 20-g mass of the explosive
charge, a peak radiation power of 300 kW/sr and an energy yield of 400–600 J/sr integrated over the emission spectrum are
attained. The efficiency of conversion of the chemical energy of the explosive into radiation is 5.0–7.5%. 相似文献
9.
N. A. Inogamov A. Ya. Faenov V. V. Zhakhovskii I. Yu. Skobelev V. A. Khokhlov Y. Kato M. Tanaka T. A. Pikuz M. Kishimoto M. Ishino M. Nishikino Y. Fukuda S. V. Bulanov T. Kawachi Yu. V. Petrov S. I. Anisimov V. E. Fortov 《等离子体物理论文集》2011,51(4):361-366
Laser‐matter interaction is defined by an electronic band structure of condensed matter and frequency ωL of electromagnetic radiation. In the range of moderate fluences, the energy absorbed by electrons from radiation finally thermalizes in the ion thermal energy. The thermalization processes are different for optical as compared with X‐ray quanta and for metals relative to semiconductors and dielectrics, since the light absorption and electron‐electron, electron‐ion dynamics are sensitive to the electron population in a conduction band and the width of a forbidden gap. Although the thermalization processes are different, the final state is simply a heated matter. Laser heating creates powerful stresses in a target if duration of a laser pulse τL is short in acoustic time scale. Nucleation and material removal take place under such stresses. Such way of removal is called here the spallative ablation. Thus the spallative ablation is an ablation mechanism universally important for qualitatively different materials and quanta (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
10.
Borghesi M Bulanov S Campbell DH Clarke RJ Esirkepov TZh Galimberti M Gizzi LA MacKinnon AJ Naumova NM Pegoraro F Ruhl H Schiavi A Willi O 《Physical review letters》2002,88(13):135002
A novel physical phenomenon has been observed following the interaction of an intense (10(19) W/cm(2)) laser pulse with an underdense plasma. Long-lived, macroscopic bubblelike structures have been detected through the deflection that the associated electric charge separation causes in a proton probe beam. These structures are interpreted as the remnants of a cloud of relativistic solitons generated in the plasma by the ultraintense laser pulse. This interpretation is supported by an analytical study of the soliton cloud evolution, by particle-in-cell simulations, and by a reconstruction of the proton-beam deflection. 相似文献