12 results on '"B. Ráczkevi"'
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2. Long-range propagation of ultrafast ionizing laser pulses in a resonant nonlinear medium
- Author
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G. Zevi della Porta, V. N. Fedosseev, B. Ráczkevi, E. Öz, F. Friebel, H. Panuganti, Patric Muggli, M. Á. Kedves, F. Batsch, Spencer Gessner, J. T. Moody, G. P. Djotyan, M. Hüther, A.-M. Bachmann, Eduardo Granados, G. Demeter, F. Braunmüller, M. Aladi, L. Verra, M. Martyanov, V. Lee, and E. Guran
- Subjects
Physics ,Other Fields of Physics ,chemistry.chemical_element ,FOS: Physical sciences ,Laser ,Physics - Plasma Physics ,law.invention ,Rubidium ,ddc ,Plasma Physics (physics.plasm-ph) ,Wavelength ,chemistry ,law ,Nonlinear medium ,Ionization ,physics.plasm-ph ,Plasma channel ,physics.optics ,Absorption (logic) ,Physics::Atomic Physics ,Atomic physics ,Ultrashort pulse ,Physics - Optics ,Optics (physics.optics) - Abstract
We study the propagation of 0.05-1 TW power, ultrafast laser pulses in a 10 meter long rubidium vapor cell. The central wavelength of the laser is resonant with the $D_2$ line of rubidium and the peak intensity in the $10^{12}-10^{14} ~W/cm^2$ range, enough to create a plasma channel with single electron ionization. We observe the absorption of the laser pulse for low energy, a regime of transverse confinement of the laser beam by the strong resonant nonlinearity for higher energies and the transverse broadening of the output beam when the nonlinearity is saturated due to full medium ionization. We compare experimental observations of transmitted pulse energy and transverse fluence profile with the results of computer simulations modeling pulse propagation. We find a qualitative agreement between theory and experiment that corroborates the validity of our propagation model. While the quantitative differences are substantial, the results show that the model can be used to interpret the observed phenomena in terms of self-focusing and channeling of the laser pulses by the saturable nonlinearity and the transparency of the fully ionized medium along the propagation axis., Comment: 12 pages, 10 Figures
- Published
- 2021
3. Simulation and experimental study of proton bunch self-modulation in plasma with linear density gradients
- Author
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Thibaut Lefèvre, J. Pucek, L. Verra, M. Granetzny, A. Perera, Kookjin Moon, M. Wendt, M. Aladi, Y. Andrebe, V. Hafych, N. Lopes, V. N. Fedosseev, Ralph Fiorito, J. T. Moody, E. D. Guran, C. Davut, T. Graubner, R. Agnello, Stefano Mazzoni, M. Turner, N. Torrado, R. Apsimon, M. C. Amoedo Goncalves, James Henderson, Allen Caldwell, Philip Burrows, S. Doebert, Patrick Muggli, M. Hüther, B. Ráczkevi, Linbo Liang, Ans Pardons, Olaf Grulke, Alexander Pukhov, M. Krupa, F. Batsch, P. I. Morales Guzmán, Spencer Gessner, M. A. Baistrukov, H. Panuganti, S. Rey, M. Martyanov, Eugenio Senes, M. Zepp, Moses Chung, Ivo Furno, M. Á. Kedves, V. K. Khudyakov, Oliver Schmitz, D. Medina Godoy, Ambrogio Fasoli, Rebecca Ramjiawan, H. Damerau, Guoxing Xia, Jorge Vieira, E. Nowak, Eric Chevallay, G. Zevi della Porta, Luis O. Silva, A. Topaloudis, C. Pakuza, M. Moreira, Matthew Wing, A.-M. Bachmann, G. Demeter, John P. Farmer, Konstantin Lotov, P. Blanchard, Eduardo Granados, C. Stollberg, O. Apsimon, A. Sublet, D. A. Cooke, Carsten Welsch, J. Wolfenden, B. Woolley, P. V. Tuev, Ricardo Fonseca, J. Chappell, F. Braunmüller, Florian Kraus, A. A. Gorn, Sung Youb Kim, B. Buttenschön, Amos Dexter, C. Ahdida, Edda Gschwendtner, Francesco Velotti, Michele Bergamaschi, T. Nechaeva, H. Vincke, and Collaboration, AWAKE
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Accelerator Physics (physics.acc-ph) ,Nuclear and High Energy Physics ,Physics and Astronomy (miscellaneous) ,Proton ,Dephasing ,Other Fields of Physics ,FOS: Physical sciences ,01 natural sciences ,Ciências Naturais::Ciências Físicas [Domínio/Área Científica] ,010305 fluids & plasmas ,Position (vector) ,Physics::Plasma Physics ,physics.plasm-ph ,0103 physical sciences ,010306 general physics ,physics.acc-ph ,Physics ,Linear density ,Charge (physics) ,Surfaces and Interfaces ,Plasma ,Accelerators and Storage Rings ,Physics - Plasma Physics ,Computational physics ,ddc ,Plasma Physics (physics.plasm-ph) ,Physics::Accelerator Physics ,Physics - Accelerator Physics ,Frequency modulation ,Beam (structure) - Abstract
We present numerical simulations and experimental results of the self-modulation of a long proton bunch in a plasma with linear density gradients along the beam path. Simulation results agree with the experimental results reported in arXiv:2007.14894v2: with negative gradients, the charge of the modulated bunch is lower than with positive gradients. In addition, the bunch modulation frequency varies with gradient. Simulation results show that dephasing of the wakefields with respect to the relativistic protons along the plasma is the main cause for the loss of charge. The study of the modulation frequency reveals details about the evolution of the self-modulation process along the plasma. In particular for negative gradients, the modulation frequency across time-resolved images of the bunch indicates the position along the plasma where protons leave the wakefields. Simulations and experimental results are in excellent agreement., Comment: 13 pages, 11 figures
- Published
- 2021
4. Analysis of Proton Bunch Parameters in the AWAKE Experiment
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Stefano Mazzoni, J. Pucek, M. Turner, V. N. Fedosseev, Robert Apsimon, Jorge Vieira, A. A. Gorn, A. Perera, O. Apsimon, B. Ráczkevi, D. Medina Godoy, L. Verra, B. Buttenschön, M. Aladi, R. Fiorito, Rebecca Ramjiawan, G. Zevi della Porta, P. I. Morales Guzmán, Carsten Welsch, M. Krupa, Kookjin Moon, Ricardo Fonseca, Florian Kraus, H. Panuganti, S. Doebert, Nelson Lopes, E. Senes, S. Rey, B. Woolley, V. Khudyakov, M. Granetzny, D. A. Cooke, C. Pakuza, Oliver Schmitz, Allen Caldwell, Ambrogio Fasoli, R. Agnello, T. Nechaeva, Matthew Wing, M. Moreira, Eduardo Granados, Luis O. Silva, Konstantin Lotov, Manfred Wendt, C. Stollberg, P. Blanchard, Alexander Pukhov, Moses Chung, N. Torrado, V. Hafych, A. Topaloudis, Spencer Gessner, Amos Dexter, G. Demeter, C. Ahdida, E. Nowak, J. Wolfenden, Eric Chevallay, Edda Gschwendtner, S.-Y. Kim, Linbo Liang, J. T. Moody, M. Á. Kedves, John P. Farmer, C. Davut, M. Hüther, E. D. Guran, Philip Burrows, Olaf Grulke, A. Sublet, M. Bergamaschi, Ans Pardons, T. Graubner, Francesco Velotti, F. Batsch, M. Zepp, P. V. Tuev, M. A. Baistrukov, J. Chappell, Y. Andrebe, A.-M. Bachmann, H. Vincke, M. C. Amoedo Goncalves, H. Damerau, Ivo Furno, Guoxing Xia, J. R. Henderson, Thibaut Lefèvre, AWAKE Collaboration, and Collaboration, The AWAKE
- Subjects
Accelerator Physics (physics.acc-ph) ,Proton ,FOS: Physical sciences ,Fitting methods ,Radiation ,Bayesian inference ,Ciências Naturais::Ciências Físicas [Domínio/Área Científica] ,High Energy Physics - Experiment ,analysis and statistical methods ,High Energy Physics - Experiment (hep-ex) ,Ciências Naturais::Matemáticas [Domínio/Área Científica] ,Beam-line instrumentation (beam position and profile monitors beam intensity monitors bunch length monitors) ,Pattern recognition ,beam-line instrumentation (beam position and profile monitors, beam-intensity monitors bunch, length monitors) ,Engenharia e Tecnologia::Outras Engenharias e Tecnologias [Domínio/Área Científica] ,wakefield ,Divergence (statistics) ,Instrumentation ,Mathematical Physics ,physics.acc-ph ,Physics ,Pattern recognition, cluster finding, calibration and fitting methods ,hep-ex ,Cluster finding calibration ,Process (computing) ,electrons ,acceleration ,Accelerators and Storage Rings ,Computational physics ,Transverse plane ,Bunches ,Beamline ,pattern recognition, cluster finding, calibration and fitting methods ,Beam-line instrumentation (beam position and profile monitors, beam-intensity monitors, bunch length monitors) ,Analysis and statistical methods ,beam ,Physics::Accelerator Physics ,Physics - Accelerator Physics ,Particle Physics - Experiment - Abstract
A precise characterization of the incoming proton bunch parameters is required to accurately simulate the self-modulation process in the Advanced Wakefield Experiment (AWAKE). This paper presents an analysis of the parameters of the incoming proton bunches used in the later stages of the AWAKE Run 1 data-taking period. The transverse structure of the bunch is observed at multiple positions along the beamline using scintillating or optical transition radiation screens. The parameters of a model that describes the bunch transverse dimensions and divergence are fitted to represent the observed data using Bayesian inference. The analysis is tested on simulated data and then applied to the experimental data. A precise characterization of the incoming proton bunch parameters is required to accurately simulate the self-modulation process in the Advanced Wakefield Experiment (AWAKE). This paper presents an analysis of the parameters of the incoming proton bunches used in the later stages of the AWAKE Run 1 data-taking period. The transverse structure of the bunch is observed at multiple positions along the beamline using scintillating or optical transition radiation screens. The parameters of a model that describes the bunch transverse dimensions and divergence are fitted to represent the observed data using Bayesian inference. The analysis is tested on simulated data and then applied to the experimental data.
- Published
- 2021
- Full Text
- View/download PDF
5. Proton Bunch Self-Modulation in Plasma with Density Gradient
- Author
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Eric Chevallay, V. A. Minakov, F. Keeble, Linbo Liang, Ans Pardons, F. Friebel, J. R. Henderson, M. A. Baistrukov, Stefano Mazzoni, M. Turner, Yu Li, F. Batsch, Ivo Furno, L. Verra, M. Granetzny, H. Saberi, Philip Burrows, V. Hafych, Carsten Welsch, J. T. Moody, M. Hüther, Guoxing Xia, Benjamin Woolley, M. Á. Kedves, P. Blanchard, P. V. Tuev, V. A. Verzilov, J. Chappell, M. Chung, Florian Kraus, R. I. Spitsyn, Ricardo Fonseca, T. Nechaeva, A. Perera, Olaf Grulke, M. Krupa, M. Aladi, R. Fiorito, S. Liu, Brennan Goddard, A. Helm, Nelson Lopes, I. Gorgisyan, Erik Adli, E. Senes, Ambrogio Fasoli, Patric Muggli, M. Zepp, S. Doebert, L. H. Deubner, Spencer Gessner, D. Medina Godoy, Rebecca Ramjiawan, M. Martyanov, S. Rey, Hartmut Ruhl, M. Moreira, Alan Howling, H. Panuganti, Amos Dexter, Simon Jolly, R. Jacquier, D. A. Cooke, Edda Gschwendtner, G. Zevi della Porta, G. P. Djotyan, T. Lefevre, M. Bergamaschi, J. Pucek, L. Garolfi, B. Williamson, Matthew Wing, H. Damerau, A. A. Gorn, V. N. Fedosseev, Eduardo Granados, I. Yu. Kargapolov, Francesco Velotti, Robert Apsimon, Sung Youb Kim, B. Buttenschön, O. Apsimon, Luis O. Silva, F. Braunmüller, B. Ráczkevi, Alexander Pukhov, Anthony Hartin, G. Demeter, M. D. Kelisani, John P. Farmer, Allen Caldwell, R. Agnello, Peter Sherwood, F. Peña Asmus, Jorge Vieira, A.-M. Bachmann, P. I. Morales Guzmán, Konstantin Lotov, J. Wolfenden, C. Davut, Oliver Schmitz, Alexey Petrenko, Y. Andrebe, and Collaboration, AWAKE
- Subjects
Accelerator Physics (physics.acc-ph) ,Proton ,Density gradient ,Other Fields of Physics ,FOS: Physical sciences ,General Physics and Astronomy ,Ciências Naturais::Ciências Físicas [Domínio/Área Científica] ,01 natural sciences ,Physics::Plasma Physics ,physics.plasm-ph ,0103 physical sciences ,010306 general physics ,physics.acc-ph ,Physics ,Linear system ,Spectral density ,Plasma ,Accelerators and Storage Rings ,Physics - Plasma Physics ,Plasma Physics (physics.plasm-ph) ,Modulation ,Physics::Accelerator Physics ,Physics - Accelerator Physics ,Atomic physics ,Phase velocity ,Frequency modulation - Abstract
We study experimentally the effect of linear plasma density gradients on the self-modulation of a 400\,GeV proton bunch. Results show that a positive/negative gradient in/decreases the number of micro-bunches and the relative charge per micro-bunch observed after 10\,m of plasma. The measured modulation frequency also in/decreases. With the largest positive gradient we observe two frequencies in the modulation power spectrum. Results are consistent with changes in wakefields' phase velocity due to plasma density gradient adding to the slow wakefields' phase velocity during self-modulation growth predicted by linear theory., Comment: 14 pages, 4 figures
- Published
- 2020
6. Experimental Study of Wakefields Driven by a Self-Modulating Proton Bunch in Plasma
- Author
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L. Garolfi, M. Aladi, B. Williamson, Simon Jolly, J. T. Moody, P. I. Morales Guzmán, H. Panuganti, Michele Bergamaschi, V. N. Fedosseev, M. A. Baistrukov, M. Krupa, A. A. Gorn, Eugenio Senes, Alan Howling, M. Hüther, Erik Adli, Robert Apsimon, G. Demeter, Oliver Schmitz, Luis O. Silva, Alexander Pukhov, John P. Farmer, A. Helm, S. Rey, Jorge Vieira, Sung Youb Kim, V. A. Verzilov, Ivo Furno, Benjamin Woolley, B. Buttenschön, Patric Muggli, Linbo Liang, S. Liu, Florian Kraus, R. Jacquier, Olaf Grulke, Ans Pardons, J. Pucek, Philip Burrows, I. Yu. Kargapolov, M. Moreira, F. Friebel, B. Ráczkevi, T. Lefevre, F. Batsch, Allen Caldwell, H. Damerau, R. Agnello, S. Doebert, Stefano Mazzoni, I. Gorgisyan, M. Martyanov, Guoxing Xia, L. Verra, L. H. Deubner, Peter Sherwood, F. Peña Asmus, D. Medina Godoy, M. Granetzny, Rebecca Ramjiawan, Anthony Hartin, A. Perera, Brennan Goddard, F. Keeble, M. D. Kelisani, James Henderson, Ambrogio Fasoli, A.-M. Bachmann, Spencer Gessner, V. Hafych, Eric Chevallay, N. Lopes, Ralph Fiorito, V. A. Minakov, H. Saberi, D. A. Cooke, M. Zepp, Konstantin Lotov, P. Blanchard, Yang Li, Moses Chung, J. Wolfenden, Matthew Wing, Eduardo Granados, M. Á. Kedves, O. Apsimon, Alexey Petrenko, Hartmut Ruhl, P. V. Tuev, J. Chappell, G. P. Djotyan, C. Davut, Amos Dexter, Edda Gschwendtner, Y. Andrebe, Francesco Velotti, M. Turner, G. Zevi della Porta, Carsten Welsch, and Ricardo Fonseca
- Subjects
Accelerator Physics (physics.acc-ph) ,Nuclear and High Energy Physics ,Physics and Astronomy (miscellaneous) ,Proton ,Other Fields of Physics ,FOS: Physical sciences ,Context (language use) ,Electron ,Ciências Naturais::Ciências Físicas [Domínio/Área Científica] ,01 natural sciences ,Nuclear physics ,Physics::Plasma Physics ,physics.plasm-ph ,0103 physical sciences ,010306 general physics ,physics.acc-ph ,awake ,Physics ,010308 nuclear & particles physics ,Final energy ,Surfaces and Interfaces ,Plasma ,Radius ,Accelerators and Storage Rings ,Physics - Plasma Physics ,Plasma Physics (physics.plasm-ph) ,Transverse plane ,Amplitude ,beam ,Physics::Accelerator Physics ,Physics - Accelerator Physics - Abstract
We study experimentally the longitudinal and transverse wakefields driven by a highly relativistic proton bunch during self-modulation in plasma. We show that the wakefields' growth and amplitude increase with increasing seed amplitude as well as with the proton bunch charge in the plasma. We study transverse wakefields using the maximum radius of the proton bunch distribution measured on a screen downstream from the plasma. We study longitudinal wakefields by externally injecting electrons and measuring their final energy. Measurements agree with trends predicted by theory and numerical simulations and validate our understanding of the development of self-modulation. Experiments were performed in the context of the Advanced Wakefield Experiment (AWAKE)., 4 figures
- Published
- 2020
7. Difference holographic interferometry
- Author
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F. Gyimesi, Z. Füzessy, and B. Ráczkevi
- Published
- 2000
8. Implicit single step methods by spline-like functions for solution of ordinary differential equations
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G. Molnárka and B. Ráczkevi
- Subjects
Weak solution ,Mathematical analysis ,Explicit and implicit methods ,Exact differential equation ,Bogacki–Shampine method ,Integrating factor ,Examples of differential equations ,Computational Mathematics ,Computational Theory and Mathematics ,Modelling and Simulation ,Modeling and Simulation ,Collocation method ,Ordinary differential equation ,ComputingMethodologies_SYMBOLICANDALGEBRAICMANIPULATION ,Mathematics - Abstract
The main aim of our work is to create an approximate solution to the ordinary differential equations (ODE's) which is continuously differentiable. For this purpose we add an extra term to any one step explicit method for solution of ODE's and this new method gives a continuously differentiable solution and “by stealth” the order of the solution's accuracy increases by one.
- Published
- 1988
9. Stabilization and time resolved measurement of the frequency evolution of a modulated diode laser for chirped pulse generation.
- Author
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K Varga-Umbrich, J S Bakos, G P Djotyan, P N Ignácz, B Ráczkevi, Zs Sörlei, J Szigeti, and M Á Kedves
- Abstract
We have developed experimental methods for the generation of chirped laser pulses of controlled frequency evolution in the nanosecond pulse length range for coherent atomic interaction studies. The pulses are sliced from the radiation of a cw external cavity diode laser while its drive current, and consequently its frequency, are sinusoidally modulated. By the proper choice of the modulation parameters, as well as of the timing of pulse slicing, we can produce a wide variety of frequency sweep ranges during the pulse. In order to obtain the required frequency chirp, we need to stabilize the center frequency of the modulated laser and to measure the resulting frequency evolution with appropriate temporal resolution. These tasks have been solved by creating a beat signal with a reference laser locked to an atomic transition frequency. The beat signal is then analyzed, as well as its spectral sideband peaks are fed back to the electronics of the frequency stabilization of the modulated laser. This method is simple and it has the possibility for high speed frequency sweep with narrow linewidth that is appropriate, for example, for selective manipulation of atomic states in a magneto-optical trap. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
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10. Monitoring of nanoplasmonics-assisted deuterium production in a polymer seeded with resonant Au nanorods using in situ femtosecond laser induced breakdown spectroscopy.
- Author
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Kroó N, Aladi M, Kedves M, Ráczkevi B, Kumari A, Rácz P, Veres M, Galbács G, Csernai LP, and Biró TS
- Abstract
In this brief report, we present laser induced breakdown spectroscopy (LIBS) evidence of deuterium (D) production in a 3:1 urethane dimethacrylate (UDMA) and triethylene glycol dimethacrylate (TEGDMA) polymer doped with resonant gold nanorods, induced by intense, 40 fs laser pulses. The in situ recorded LIBS spectra revealed that the D/(2D + H) increased to 4-8% in the polymer samples in selected events. The extent of transmutation was found to linearly increase with the laser pulse energy (intensity) between 2 and 25 mJ (up to 3 × 10
17 W/cm2 ). The observed effect is attributed only to the field enhancing effects due to excited localized surface plasmons on the gold nanoparticles., (© 2024. The Author(s).)- Published
- 2024
- Full Text
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11. Proton Bunch Self-Modulation in Plasma with Density Gradient.
- Author
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Braunmüller F, Nechaeva T, Adli E, Agnello R, Aladi M, Andrebe Y, Apsimon O, Apsimon R, Bachmann AM, Baistrukov MA, Batsch F, Bergamaschi M, Blanchard P, Burrows PN, Buttenschön B, Caldwell A, Chappell J, Chevallay E, Chung M, Cooke DA, Damerau H, Davut C, Demeter G, Deubner LH, Dexter A, Djotyan GP, Doebert S, Farmer J, Fasoli A, Fedosseev VN, Fiorito R, Fonseca RA, Friebel F, Furno I, Garolfi L, Gessner S, Goddard B, Gorgisyan I, Gorn AA, Granados E, Granetzny M, Grulke O, Gschwendtner E, Hafych V, Hartin A, Helm A, Henderson JR, Howling A, Hüther M, Jacquier R, Jolly S, Kargapolov IY, Kedves MÁ, Keeble F, Kelisani MD, Kim SY, Kraus F, Krupa M, Lefevre T, Li Y, Liang L, Liu S, Lopes N, Lotov KV, Martyanov M, Mazzoni S, Medina Godoy D, Minakov VA, Moody JT, Morales Guzmán PI, Moreira M, Muggli P, Panuganti H, Pardons A, Peña Asmus F, Perera A, Petrenko A, Pucek J, Pukhov A, Ráczkevi B, Ramjiawan RL, Rey S, Ruhl H, Saberi H, Schmitz O, Senes E, Sherwood P, Silva LO, Spitsyn RI, Tuev PV, Turner M, Velotti F, Verra L, Verzilov VA, Vieira J, Welsch CP, Williamson B, Wing M, Wolfenden J, Woolley B, Xia G, Zepp M, and Zevi Della Porta G
- Abstract
We study experimentally the effect of linear plasma density gradients on the self-modulation of a 400 GeV proton bunch. Results show that a positive or negative gradient increases or decreases the number of microbunches and the relative charge per microbunch observed after 10 m of plasma. The measured modulation frequency also increases or decreases. With the largest positive gradient we observe two frequencies in the modulation power spectrum. Results are consistent with changes in wakefields' phase velocity due to plasma density gradients adding to the slow wakefields' phase velocity during self-modulation growth predicted by linear theory.
- Published
- 2020
- Full Text
- View/download PDF
12. Half-magnitude extensions of resolution and field of view in digital holography by scanning and magnification.
- Author
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Gyímesi F, Füzessy Z, Borbély V, Ráczkevi B, Molnár G, Czitrovszky A, Tibor Nagy A, Molnárka G, Lotfi A, Nagy A, Harmati I, and Szigethy D
- Abstract
Digital holography replaces the permanent recording material of analog holography with an electronic light sensitive matrix detector, but besides the many unique advantages, this brings serious limitations with it as well. The limited resolution of matrix detectors restricts the field of view, and their limited size restricts the resolution in the reconstructed holographic image. Scanning the larger aerial hologram (the interference light field of the object and reference waves in the hologram plane) with the small matrix detector or using magnification for the coarse matrix detector at the readout of the fine-structured aerial hologram, these are straightforward solutions but have been exploited only partially until now. We have systematically applied both of these approaches and have driven them to their present extremes, over half a magnitude in extensions.
- Published
- 2009
- Full Text
- View/download PDF
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