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18 results on '"Grigoryan, B."'

5. First operation of a free-electron laser generating GW power radiation at 32 nm wavelength

Author

Ayvazyan, V., Baboi, N., Bähr, J., Balandin, V., Beutner, B., Brandt, A., Bohnet, I., Bolzmann, A., Brinkmann, R., Brovko, O. I., Carneiro, J. P., Casalbuoni, S., Castellano, M., Castro, P., Catani, L., Chiadroni, E., Choroba, S., Cianchi, A., Delsim-Hashemi, H., Di Pirro, G., Dohlus, M., Düsterer, S., Edwards, H. T., Faatz, B., Fateev, A. A., Feldhaus, J., Flöttmann, K., Frisch, J., Fröhlich, L., Garvey, T., Gensch, U., Golubeva, N., Grabosch, H.-J., Grigoryan, B., Grimm, O., Hahn, U., Han, J. H., Hartrott, M. V., Honkavaara, K., Hüning, M., Ischebeck, R., Jaeschke, E., Jablonka, M., Kammering, R., Katalev, V., Keitel, B., Khodyachykh, S., Kim, Y., Kocharyan, V., Körfer, M., Kollewe, M., Kostin, D., Krämer, D., Krassilnikov, M., Kube, G., Lilje, L., Limberg, T., Lipka, D., Löhl, F., Luong, M., Magne, C., Menzel, J., Michelato, P., Miltchev, V., Minty, M., Möller, W. D., Monaco, L., Müller, W., Nagl, M., Napoly, O., Nicolosi, P., Nölle, D., Nuñez, T., Oppelt, A., Pagani, C., Paparella, R., Petersen, B., Petrosyan, B., Pflüger, J., Piot, P., Plönjes, E., Poletto, L., Proch, D., Pugachov, D., Rehlich, K., Richter, D., Riemann, S., Ross, M., Rossbach, J., Sachwitz, M., Saldin, E. L., Sandner, W., Schlarb, H., Schmidt, B., Schmitz, M., Schmüser, P., Schneider, J. R., Schneidmiller, E. A., Schreiber, H.-J., Schreiber, S., Shabunov, A. V., Sertore, D., Setzer, S., Simrock, S., Sombrowski, E., Staykov, L., Steffen, B., Stephan, F., Stulle, F., Sytchev, K. P., Thom, H., Tiedtke, K., Tischer, M., Treusch, R., Trines, D., Tsakov, I., Vardanyan, A., Wanzenberg, R., Weiland, T., Weise, H., Wendt, M., Will, I., Winter, A., Wittenburg, K., Yurkov, M. V., Zagorodnov, I., Zambolin, P., and Zapfe, K.

Published
2006
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6. A new powerful source for coherent VUV radiation: Demonstration of exponential growth and saturation at the TTF free-electron laser

Author

Ayvazyan, V., Baboi, N., Bohnet, I., Brinkmann, R., Castellano, M., Castro, P., Catani, L., Choroba, S., Cianchi, A., Dohlus, M., Edwards, H.T., Faatz, B., Fateev, A.A., Feldhaus, J., Flöttmann, K., Gamp, A., Garvey, T., Genz, H., Gerth, Ch., Gretchko, V., Grigoryan, B., Hahn, U., Hessler, C., Honkavaara, K., Hüning, M., Ischebeck, R., Jablonka, M., Kamps, T., Körfer, M., Krassilnikov, M., Krzywinski, J., Liepe, M., Liero, A., Limberg, T., Loos, H., Luong, M., Magne, C., Menzel, J., Michelato, P., Minty, M., Müller, U.-C., Nölle, D., Novokhatski, A., Pagani, C., Peters, F., Pflüger, J., Piot, P., Plucinski, L., Rehlich, K., Reyzl, I., Richter, A., Rossbach, J., Saldin, E.L., Sandner, W., Schlarb, H., Schmidt, G., Schmüser, P., Schneider, J.R., Schneidmiller, E.A., Schreiber, H.-J., Schreiber, S., Sertore, D., Setzer, S., Simrock, S., Sobierajski, R., Sonntag, B., Steeg, B., Stephan, F., Sytchev, K.P., Tiedtke, K., Tonutti, M., Treusch, R., Trines, D., Türke, D., Verzilov, V., Wanzenberg, R., Weiland, T., Weise, H., Wendt, M., Wilhein, T., Will, I., Wittenburg, K., Wolff, S., Yurkov, M.V., and Zapfe, K.

Published
2002
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7. Colony-Forming Ability and Residual Foci of DNA Repair Proteins in Human Lung Fibroblasts Irradiated with Subpicosecond Beams of Accelerated Electrons.

Author

Babayan, N. S., Guryev, D. V., Vorobyeva, N. Yu., Grigoryan, B. A., Tadevosyan, G. L., Apresyan, L. S., Chigasova, A. K., Yashkina, E. I., Rodneva, S. M., Tsishnatti, A. A., Fedotov, Yu. A., Sarkisyan, N. K., Manukyan, A. T., Aroutiounian, R. M., and Osipov, A. N.

Subjects
ELECTRON beams, DNA repair, GERM cells, RADIATION exposure, LUNGS, FIBROBLASTS
Abstract

We performed a comparative study of the colony-forming ability and the number of residual foci of DNA repair proteins in cultured human lung fibroblasts (MRC-5 cell line) after exposure to subpicosecond beams of accelerated electrons with an energy of 3.6 MeV and quasi-continuous radiation (accelerated electrons with an energy of 4 MeV and X-rays). The yield of damages causing reproductive cell death after pulsed subpicosecond radiation exposure was higher by ~1.8 times than after quasi-continuous radiation exposure. The quantitative yield of residual γH2AX foci (phosphorylated H2AX histone, a protein marker of DNA double breaks) in cells irradiated with subpicosecond beams of accelerated electrons was shown to be ~2.0- 2.5-fold higher than in cells irradiated with quasi-continuous beams of accelerated electrons. [ABSTRACT FROM AUTHOR]

Published
2021
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8. Study of the statistical properties of the radiation from a VUV SASE FEL operating in the femtosecond regime

Author

Ayvazyan, V, Carneiro, J.-P, Castro, P, Faatz, B, Fateev, A.A, Feldhaus, J, Gerth, Ch, Gretchko, V, Grigoryan, B, Hahn, U, Honkavaara, K, Hüning, M, Ischebeck, R, Jastrow, U, Kammering, R, Menzel, J, Minty, M, Nölle, D, Pflüger, J, Piot, Ph, Plucinski, L, Rehlich, K, Rossbach, J, Saldin, E.L, Schlarb, H, Schneidmiller, E.A, Schreiber, S, Sobierajski, R, Steeg, B, Stulle, F, Sytchev, K.P, Tiedtke, K, Treusch, R, Weise, H, Wendt, M, and Yurkov, M.V

Published
2003
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9. Middle Infrared and THz Sources at AREAL.

Author

Sahakyan, V. V., Sargsyan, A. A., Zanyan, G. S., Vardanyan, T. S., Grigoryan, B. A., and Tsakanov, V. M.

Subjects
LINEAR acceleration, FREE electron lasers, UNDULATOR radiation
Abstract

AREAL (Advanced Research Electron Accelerator Laboratory) is an electron linear accelerator with a laser driven RF gun constructed at CANDLE Synchrotron Research Institute. After the successful operation of the gun section at 5 MeV, a program of facility energy growth up to 50 MeV has been launched, which includes the construction of two advanced experimental stations for the generation of middle infrared and THz radiation. This paper presents the design of these stations and gives the characteristics of expected radiation based on numerical and theoretical studies. [ABSTRACT FROM AUTHOR]

Published
2018

10. The Use of Different Pulsed Electron Irradiation for the Formation of Radiation Defects in Silicon Crystals.

Author

Yeritsyan, H. N., Sahakyan, A. A., Grigoryan, N. E., Harutyunyan, V. V., Grigoryan, B. A., Amatuni, G. A., Petrosyan, V. H., Khachatryan, A. A., and Rhodes, C. J.

Subjects
PULSED electroacoustic methods, POINT defects, SILICON crystals, METAL formability, HALL effect, METAL clusters
Abstract

This paper reports the formation of structural defects in the lattice of silicon (n-Si) single crystals, as a result of irradiation by different intensities and pulses of electrons. The samples were studied by means of Hall effect measurements of electro-physical parameters (specifically the concentration of the main charge carriers) as a function of temperature and radiation dose. The role of the radiation current density (pulse height) is discussed, which gives rise to a peculiar behavior in the electrical-physical properties of n-Si. In particular, thermal processes are found not to develop, due to the ultrafast (pulse duration in the range 10−12-10−13s) nature of the incident radiation, which causes an almost “pure” energy interaction to occur between the radiation and the atoms within the crystal, and the formation of cluster defects. A scheme for the time-scale of the formation of these radiation defects is presented. From the dose and temperature dependences of the concentration of main charge carriers, the radiation defects introduction rates were determined. [ABSTRACT FROM AUTHOR]

Published
2018
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13. FLUCTUATIONS OF THE ENZYMATIC REACTION RATE.

Author

Arakelyan, V. B., Simonyan, A. L., Gevorgyan, A. E., Sukiasyan, T. S., Arakelyan, A. V., Grigoryan, B. A., and Gevorgyan, E. S.

Subjects
ENZYMES, REACTION mechanisms (Chemistry), STOCHASTIC processes, DISPERSION (Chemistry), CHEMICAL kinetics, EXPERIMENTAL design
Abstract

The paper investigates the fluctuations of the rate of enzymatic reaction with theoretical estimations and analysis. It was shown that combined analysis of the reaction rate and its dispersion allows obtaining new information on the reaction through the comparison of the theoretical formulas and experimental data. The latter includes the rate constants of enzyme-substrate complex decay and maximal enzyme concentration. [ABSTRACT FROM AUTHOR]

Published
2004

14. Center for the Advancement of Natural Discoveries using light emission: A new project for 3 GeV intermediate energy light source in the Republic of Armenia.

Author

Tsakanov, V., Avagyan, V., Ayvazyan, V., Amatuni, G., Grigoryan, B., Ivanian, M., Laziev, E., Martirosyan, Y., Mikaelyan, R., Tatikian, S., and Vardanyan, A.

Subjects
SYNCHROTRON radiation, LIGHT sources
Abstract

We are planning to construct a 3 GeV synchrotron light source in the Republic of Armenia called Center for the Advancement of Natural Discoveries using light emission—CANDLE. The purpose of the machine is to produce high flux and high brightness photon beams from bends and insertion devices in the soft and hard x-ray spectrum range from 1 to 50 keV. The main elements of the light source are an S-band linac, a full energy booster, and a 16-cell double bend achromatic storage ring. We will discuss the main parameters of the machine, the insertion devices, and the preliminary beamlines instrumentation. © 2002 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
2002
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18. Passive Ballistic Microbunching of Nonultrarelativistic Electron Bunches Using Electromagnetic Wakefields in Dielectric-Lined Waveguides.

Author

Lemery, F., Piot, P., Amatuni, G., Boonpornprasert, P., Chen, Y., Good, J., Grigoryan, B., Groß, M., Krasilinikov, M., Lishilin, O., Loisch, G., Oppelt, A., Philipp, S., Qian, H., Renier, Y., Stephan, F., and Zagorodnov, I.

Subjects
*ELECTROMAGNETIC radiation, *PARTICLE beam bunching, *ELECTRON diffraction
Abstract

Temporally modulated electron beams have a wide array of applications ranging from the generation of coherently enhanced electromagnetic radiation to the resonant excitation of electromagnetic wakefields in advanced-accelerator concepts. Likewise producing low-energy ultrashort microbunches could be useful for ultrafast electron diffraction and new accelerator-based light-source concepts. In this Letter we propose and experimentally demonstrate a passive microbunching technique capable of forming a picosecond bunch train at ~6 MeV. The method relies on the excitation of electromagnetic wakefields as the beam propagates through a dielectric-lined waveguide. Owing to the nonultrarelativistic nature of the beam, the induced energy modulation eventually converts into a density modulation as the beam travels in a following free-space drift. The modulated beam is further accelerated to ~20 MeV while preserving the imparted density modulation. [ABSTRACT FROM AUTHOR]

Published
2019
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