M. Dreimann, D. Eckermann, S. Roling, T. Reiker, F. Rosenthal, F. Wahlert, M. Kuhlmann, S. Toleikis, R. Treusch, E. Plönjes, H. Zacharias
We present the temporal characteristics of the split-and-delay unit at FLASH2 via visibility measurements which characterize the temporal resolution of the combined system of the FEL and the split-and-delay unit. The use of the split-and-delay unit at FLASH2 allows the users at the beamlines FL23 and FL24 at DESY to perform such pump-probe experiments. By using wavefront beam splitting, grazing incidence mirrors, and two different coatings the whole spectral region of FLASH2 is covered, and even harmonics up to 1800 eV are transmitted with a transmission of T>0.06. It is concluded that user experiments with a pump-probe scheme from the picosecond regime down into the sub-femtosecond region can be carried out.
{"title":"Enabling time-resolved experiments with ultrashort FEL pulses via the split-and-delay unit for FLASH2","authors":"M. Dreimann, D. Eckermann, S. Roling, T. Reiker, F. Rosenthal, F. Wahlert, M. Kuhlmann, S. Toleikis, R. Treusch, E. Plönjes, H. Zacharias","doi":"10.1117/12.2665626","DOIUrl":"https://doi.org/10.1117/12.2665626","url":null,"abstract":"We present the temporal characteristics of the split-and-delay unit at FLASH2 via visibility measurements which characterize the temporal resolution of the combined system of the FEL and the split-and-delay unit. The use of the split-and-delay unit at FLASH2 allows the users at the beamlines FL23 and FL24 at DESY to perform such pump-probe experiments. By using wavefront beam splitting, grazing incidence mirrors, and two different coatings the whole spectral region of FLASH2 is covered, and even harmonics up to 1800 eV are transmitted with a transmission of T>0.06. It is concluded that user experiments with a pump-probe scheme from the picosecond regime down into the sub-femtosecond region can be carried out.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117188130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Ghaith, M. Labat, E. Roussel, M. LaBerge, A. Loulergue, M. Valléau, S. Schöbel, Yen-Yu Chang, P. Ufer, M. Couprie, U. Schramm, A. Irman
Laser Plasma Accelerators (LPAs), reaching gigavolt-per-centimeter accelerating fields, can generate high peak current, low emittance and GeV class electron beams that can be qualified by a Free Electron Laser (FEL) application. We report here on the commissioning of the COXINEL beamline driven by the HZDR plasma accelerator and experimental demonstration of FEL lasing at 270 nm in a seeded configuration. We also present the transport and characterization of LPA based beams using different imaging systems along the beamline. The use of a streak camera and a UV spectrometer enable to align the seed and the electron beam in the temporal, spectral and transverse domains. Furthermore, the appearance of interference fringes, resulting from the interaction between the phase-locked emitted radiation and the seed, confirms longitudinal coherence, representing an essential feature of seeded FELs. These results are comforted by ELEGANT and GENESIS simulations.
{"title":"The COXINEL seeded free electron laser driven by the HZDR laser plasma acceleration","authors":"A. Ghaith, M. Labat, E. Roussel, M. LaBerge, A. Loulergue, M. Valléau, S. Schöbel, Yen-Yu Chang, P. Ufer, M. Couprie, U. Schramm, A. Irman","doi":"10.1117/12.2669426","DOIUrl":"https://doi.org/10.1117/12.2669426","url":null,"abstract":"Laser Plasma Accelerators (LPAs), reaching gigavolt-per-centimeter accelerating fields, can generate high peak current, low emittance and GeV class electron beams that can be qualified by a Free Electron Laser (FEL) application. We report here on the commissioning of the COXINEL beamline driven by the HZDR plasma accelerator and experimental demonstration of FEL lasing at 270 nm in a seeded configuration. We also present the transport and characterization of LPA based beams using different imaging systems along the beamline. The use of a streak camera and a UV spectrometer enable to align the seed and the electron beam in the temporal, spectral and transverse domains. Furthermore, the appearance of interference fringes, resulting from the interaction between the phase-locked emitted radiation and the seed, confirms longitudinal coherence, representing an essential feature of seeded FELs. These results are comforted by ELEGANT and GENESIS simulations.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133282977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
F. Dorchies, A. Grolleau, Sylvain Briand, J. Gautier, P. Renaudin, V. Recoules, K. Ta Phuoc, L. Lecherbourg
Exploring and understanding ultrafast processes at the atomic level is a scientific challenge. Femtosecond X-ray Absorption Near-Edge Spectroscopy (XANES) arises as an essential experimental probing method, as it can simultaneously reveal both electronic and atomic structures, and thus potentially unravel their non-equilibrium dynamic interplay which is at the origin of most of the ultrafast mechanisms. The key point of this investigation is the achievement of a femtosecond X-ray source suitable for routine experiments. This paper will show the progressive development and improvement of such laser-plasma-based X-ray sources, starting from the picosecond down to the femtosecond scale. Time-resolved XANES measurements have been achieved and interpreted using ab initio quantum molecular dynamics simulations. This diagnostic was used to shed new light on the non-equilibrium physics involved in various materials. This paper will focus on results devoted to the non-equilibrium dynamics of a copper foil brought from solid to warm dense matter regime, by the use of a femtosecond laser pulse. Particular emphasis will be given to the recent study of the ultrafast electronic transport, which was revealed by the femtosecond time resolution.
{"title":"Femtosecond structural probing of warm dense matter with betatron x-ray source","authors":"F. Dorchies, A. Grolleau, Sylvain Briand, J. Gautier, P. Renaudin, V. Recoules, K. Ta Phuoc, L. Lecherbourg","doi":"10.1117/12.2665807","DOIUrl":"https://doi.org/10.1117/12.2665807","url":null,"abstract":"Exploring and understanding ultrafast processes at the atomic level is a scientific challenge. Femtosecond X-ray Absorption Near-Edge Spectroscopy (XANES) arises as an essential experimental probing method, as it can simultaneously reveal both electronic and atomic structures, and thus potentially unravel their non-equilibrium dynamic interplay which is at the origin of most of the ultrafast mechanisms. The key point of this investigation is the achievement of a femtosecond X-ray source suitable for routine experiments. This paper will show the progressive development and improvement of such laser-plasma-based X-ray sources, starting from the picosecond down to the femtosecond scale. Time-resolved XANES measurements have been achieved and interpreted using ab initio quantum molecular dynamics simulations. This diagnostic was used to shed new light on the non-equilibrium physics involved in various materials. This paper will focus on results devoted to the non-equilibrium dynamics of a copper foil brought from solid to warm dense matter regime, by the use of a femtosecond laser pulse. Particular emphasis will be given to the recent study of the ultrafast electronic transport, which was revealed by the femtosecond time resolution.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123856604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Compact X-Ray laser is a hot topic in the field of laser research, enabling 24/7 advanced spectroscopy and overcoming the beamline bottleneck. The investigated systems are either scaled-down replicas of accelerators, or tabletop architectures based on high-harmonic generation, plasmas, or wakefield acceleration. Ideally, one would enable a large range of applications if the X-Ray source would be portable. For that, some groups are working on accelerators-on-a-chip. A new class of active materials exploiting distributed feedback was proposed 50 years ago, as a candidate for an X-Ray laser gain medium. A Fabry-Perot analysis of a selection of "röntgen materials", based on their refractive index, Bragg's coupling coefficient, and threshold gain, is presented. The alkaline earth metal oxide showed the highest gain value of all the materials considered in this work. A relationship between the refractive index of the material and the threshold gain value is given. In addition, details on the geometry of the gain medium are discussed. Theoretical analysis revealed that alkaline earth metal oxides are a promising material with a higher gain coefficient of about 77.4 nm-1 for a 0.001 μm3 crystal and the highest of all the materials investigated in this work. Except for alkaline earth metal oxide, all other oxide materials, such as transition and lanthanide metal oxide, have the lowest gain value. While nitrides, carbides, and compound semiconductors outperform oxide materials in terms of gain, they have still one order of magnitude less gain than alkaline earth metal oxide. The details of röntgen material calculations and design parameters are covered in depth.
{"title":"Röntgen materials for x-ray lasers-on-a-chip","authors":"S. Rameshbabu, Davide Bleiner","doi":"10.1117/12.2665623","DOIUrl":"https://doi.org/10.1117/12.2665623","url":null,"abstract":"Compact X-Ray laser is a hot topic in the field of laser research, enabling 24/7 advanced spectroscopy and overcoming the beamline bottleneck. The investigated systems are either scaled-down replicas of accelerators, or tabletop architectures based on high-harmonic generation, plasmas, or wakefield acceleration. Ideally, one would enable a large range of applications if the X-Ray source would be portable. For that, some groups are working on accelerators-on-a-chip. A new class of active materials exploiting distributed feedback was proposed 50 years ago, as a candidate for an X-Ray laser gain medium. A Fabry-Perot analysis of a selection of \"röntgen materials\", based on their refractive index, Bragg's coupling coefficient, and threshold gain, is presented. The alkaline earth metal oxide showed the highest gain value of all the materials considered in this work. A relationship between the refractive index of the material and the threshold gain value is given. In addition, details on the geometry of the gain medium are discussed. Theoretical analysis revealed that alkaline earth metal oxides are a promising material with a higher gain coefficient of about 77.4 nm-1 for a 0.001 μm3 crystal and the highest of all the materials investigated in this work. Except for alkaline earth metal oxide, all other oxide materials, such as transition and lanthanide metal oxide, have the lowest gain value. While nitrides, carbides, and compound semiconductors outperform oxide materials in terms of gain, they have still one order of magnitude less gain than alkaline earth metal oxide. The details of röntgen material calculations and design parameters are covered in depth.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"12582 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128731351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
F. Villa, D. Alesini, M. Anania, M. Angelucci, A. Bacci, A. Balerna, M. Bellaveglia, A. Biagioni, B. Buonuomo, S. Cantarella, F. Cardelli, M. Carillo, M. Carpanese, M. Castellano, E. Chiadroni, A. Cianchi, F. Cioeta, M. Conti, M. Coreno, Lucio Crincoli, G. Costa, A. Curcio, A. Doria, A. Del Dotto, M. Del Franco, M. Del Giorno, S. Di Mitri, Enrico Di Pasquale, G. Di Pirro, A. Drago, Zeinab Ebrahimpour, A. Esposito, L. Faillace, A. Falone, M. Ferrario, L. Ficcadenti, G. Franzini, M. Galletti, A. Gallo, A. Ghigo, L. Giannessi, A. Giribono, S. Incremona, P. Iovine, F. Iungo, S. Lauciani, A. Liedl, V. Lollo, S. Lupi, A. Marcelli, A. Mostacci, F. Nguyen, M. Opromolla, Giammarco Parise, L. Pellegrino, A. Petralia, V. Petrillo, L. Piersanti, S. Pioli, R. Pompili, E. Principi, R. Ricci, S. Romeo, A. Rossi, U. Rotundo, L. Sabbatini, A. Selce, L. Spallino, B. Spataro, G. J. Silvi, A. Stecchi, A. Stella, F. Stellato, Federica Stocchi, C. Vaccarezza, A. Vannozzi, S. Vescovi
EuPRAXIA@SPARC_LAB is a new multi-disciplinary user-facility that is currently under construction at the Laboratori Nazionali di Frascati of the INFN in the framework of the EuPRAXIA collaboration. The electron beam will be accelerated by an X-band normal conducting linac followed by a Plasma WakeField Acceleration (PWFA) stage. It will be characterized by a small footprint and it will drive two FEL beamlines for experiments, one in the VUV (50 to 180 nm) and the other in the XUV-soft x-rays (4 to 10 nm) spectral region. As an ancillary beamline, we are also including a betatron source in the x-ray from laser-plasma interaction. We present the status update of our facility.
{"title":"EuPRAXIA@SPARC_LAB status update","authors":"F. Villa, D. Alesini, M. Anania, M. Angelucci, A. Bacci, A. Balerna, M. Bellaveglia, A. Biagioni, B. Buonuomo, S. Cantarella, F. Cardelli, M. Carillo, M. Carpanese, M. Castellano, E. Chiadroni, A. Cianchi, F. Cioeta, M. Conti, M. Coreno, Lucio Crincoli, G. Costa, A. Curcio, A. Doria, A. Del Dotto, M. Del Franco, M. Del Giorno, S. Di Mitri, Enrico Di Pasquale, G. Di Pirro, A. Drago, Zeinab Ebrahimpour, A. Esposito, L. Faillace, A. Falone, M. Ferrario, L. Ficcadenti, G. Franzini, M. Galletti, A. Gallo, A. Ghigo, L. Giannessi, A. Giribono, S. Incremona, P. Iovine, F. Iungo, S. Lauciani, A. Liedl, V. Lollo, S. Lupi, A. Marcelli, A. Mostacci, F. Nguyen, M. Opromolla, Giammarco Parise, L. Pellegrino, A. Petralia, V. Petrillo, L. Piersanti, S. Pioli, R. Pompili, E. Principi, R. Ricci, S. Romeo, A. Rossi, U. Rotundo, L. Sabbatini, A. Selce, L. Spallino, B. Spataro, G. J. Silvi, A. Stecchi, A. Stella, F. Stellato, Federica Stocchi, C. Vaccarezza, A. Vannozzi, S. Vescovi","doi":"10.1117/12.2668643","DOIUrl":"https://doi.org/10.1117/12.2668643","url":null,"abstract":"EuPRAXIA@SPARC_LAB is a new multi-disciplinary user-facility that is currently under construction at the Laboratori Nazionali di Frascati of the INFN in the framework of the EuPRAXIA collaboration. The electron beam will be accelerated by an X-band normal conducting linac followed by a Plasma WakeField Acceleration (PWFA) stage. It will be characterized by a small footprint and it will drive two FEL beamlines for experiments, one in the VUV (50 to 180 nm) and the other in the XUV-soft x-rays (4 to 10 nm) spectral region. As an ancillary beamline, we are also including a betatron source in the x-ray from laser-plasma interaction. We present the status update of our facility.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128210737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
P. Valenta, Dominika Mašlárová, R. Babjak, B. Martinez, S. V. Bulanov, M. Vranic
We study beam loading of electrons accelerated via the process of direct laser acceleration under the conditions of preformed plasma channels irradiated by ultra-intense laser pulses using analytical methods and particle-incell simulations in quasi-cylindrical geometry. We find the rates at which the electrons populate the beam for multi-petawatt peak power laser drivers. We show that the majority of accelerated electrons originate at the interface between the channel interior and channel wall and outline the underlying physical mechanism.
{"title":"On the electron beam loading in radiation-friction dominated regime of direct laser acceleration","authors":"P. Valenta, Dominika Mašlárová, R. Babjak, B. Martinez, S. V. Bulanov, M. Vranic","doi":"10.1117/12.2665698","DOIUrl":"https://doi.org/10.1117/12.2665698","url":null,"abstract":"We study beam loading of electrons accelerated via the process of direct laser acceleration under the conditions of preformed plasma channels irradiated by ultra-intense laser pulses using analytical methods and particle-incell simulations in quasi-cylindrical geometry. We find the rates at which the electrons populate the beam for multi-petawatt peak power laser drivers. We show that the majority of accelerated electrons originate at the interface between the channel interior and channel wall and outline the underlying physical mechanism.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134308534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Plasma acceleration has been lately considered to become an auspicious technology for building a future multi-TeV electron-positron collider, leading to higher compactness of the device. Self-generated fields from laser-plasma interaction are, however, in contrast to electrons, usually not well-suited for positron focusing and on-axis guiding. In addition, an external positron source is required. Here, we study the method of direct laser acceleration of positrons. The positron generation is assured by an orthogonal collision of a multi-PW laser pulse and a GeV electron beam by the nonlinear Breit-Wheeler process. The acceleration subsequently takes place in a preformed plasma channel with a finite (tens-of-microns-long) radius. In this work, we examine how the choice of channel radius influences the process of acceleration. We show that this scheme is robust regarding the radius size. A significant number of the positrons is kept near the propagation axis, even if the channel radius was increased by almost 100 µm. The mechanism was examined by quasi-3D particle-in-cell simulation carried out with the OSIRIS framework.
{"title":"Effects of the channel radius on the direct laser acceleration of positrons","authors":"Dominika Mašlárová, B. Martinez, M. Vranic","doi":"10.1117/12.2665637","DOIUrl":"https://doi.org/10.1117/12.2665637","url":null,"abstract":"Plasma acceleration has been lately considered to become an auspicious technology for building a future multi-TeV electron-positron collider, leading to higher compactness of the device. Self-generated fields from laser-plasma interaction are, however, in contrast to electrons, usually not well-suited for positron focusing and on-axis guiding. In addition, an external positron source is required. Here, we study the method of direct laser acceleration of positrons. The positron generation is assured by an orthogonal collision of a multi-PW laser pulse and a GeV electron beam by the nonlinear Breit-Wheeler process. The acceleration subsequently takes place in a preformed plasma channel with a finite (tens-of-microns-long) radius. In this work, we examine how the choice of channel radius influences the process of acceleration. We show that this scheme is robust regarding the radius size. A significant number of the positrons is kept near the propagation axis, even if the channel radius was increased by almost 100 µm. The mechanism was examined by quasi-3D particle-in-cell simulation carried out with the OSIRIS framework.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134092959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We propose plasmonic switches based on nanoantennas with fractal features on top of vanadium dioxide (VO2) thin films. These plasmonic switches can be devised by utilizing various kinds of fractals like – the Sierpenski fractal or the Koch fractal. When exposed to heat, voltage, or infrared radiation, the VO2 thin film undergoes a phase transition from its insulator state to its metal state, thus leading to switching in the total optical behavior of the proposed switch. In this paper, the switching performance characteristics of the near-field plasmonic switches (NFPS) are numerically analyzed. As the iterations of the fractal features of the switch are increased, the electric-field intensity is enhanced during ON state of the NFPS and the electric-field intensity is reduced during OFF state of the NFPS. We also employ Finite Difference Time Domain (FDTD) analysis to numerically analyze the VO2 layer thickness effect on the performance of the NFPS. These plasmonic switches possess the potential to be used as elementary switching devices in computing networks and optical communication networks.
{"title":"Electromagnetic modelling of near-field plasmonic switches based on fractal nanoantennas","authors":"Y. Sharma, K. Dalal, A. Dhawan","doi":"10.1117/12.2665700","DOIUrl":"https://doi.org/10.1117/12.2665700","url":null,"abstract":"We propose plasmonic switches based on nanoantennas with fractal features on top of vanadium dioxide (VO2) thin films. These plasmonic switches can be devised by utilizing various kinds of fractals like – the Sierpenski fractal or the Koch fractal. When exposed to heat, voltage, or infrared radiation, the VO2 thin film undergoes a phase transition from its insulator state to its metal state, thus leading to switching in the total optical behavior of the proposed switch. In this paper, the switching performance characteristics of the near-field plasmonic switches (NFPS) are numerically analyzed. As the iterations of the fractal features of the switch are increased, the electric-field intensity is enhanced during ON state of the NFPS and the electric-field intensity is reduced during OFF state of the NFPS. We also employ Finite Difference Time Domain (FDTD) analysis to numerically analyze the VO2 layer thickness effect on the performance of the NFPS. These plasmonic switches possess the potential to be used as elementary switching devices in computing networks and optical communication networks.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123600243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
F. Mirani, A. Maffini, M. Galbiati, A. Formenti, D. Vavassori, D. Dellasega, V. Russo, M. Passoni
Non-destructive material characterization exploiting radiation sources is of crucial importance in several fields ranging from the characterization of artworks to environmental monitoring. For instance, Ion Beam Analysis techniques exploiting particle accelerators stand for their unparalleled detection capabilities. However, the wide use of these techniques is limited by the large costs and dimensions of the exploited sources. In this framework, laser-driven particle acceleration represents a promising alternative to conventional sources since it can address some of their limitations. It relies on the interaction of a super-intense ultrashort laser pulse with a target material to accelerate high-energy electrons and ion bunches. Laser-driven radiation sources are potentially more compact and cheaper than particle accelerators. Moreover, the same laser source can provide different radiations by acting on the target configuration. Besides electrons and ions, high-energy photons and neutrons can be produced by exploiting suitable converter materials. Lastly, the particle energies can be controlled by tuning both the laser intensity and target properties. Here, we show some of the most recent results related to the application of laser-driven radiation sources to materials characterization. Our strategy is based on advanced near-critical Double-Layer Targets (DLT) to enhance the acceleration process. By means of experimental and numerical tools, we show how laser-driven protons, electrons, photons, and neutrons can be exploited for surface and bulk elemental analysis, as well as radiography. Notably, DLTs allow for satisfying the requirements of the techniques, in terms of energies and fluxes, with reduced laser requirements.
{"title":"Laser-driven particle acceleration for multipurpose elemental analysis of materials","authors":"F. Mirani, A. Maffini, M. Galbiati, A. Formenti, D. Vavassori, D. Dellasega, V. Russo, M. Passoni","doi":"10.1117/12.2665661","DOIUrl":"https://doi.org/10.1117/12.2665661","url":null,"abstract":"Non-destructive material characterization exploiting radiation sources is of crucial importance in several fields ranging from the characterization of artworks to environmental monitoring. For instance, Ion Beam Analysis techniques exploiting particle accelerators stand for their unparalleled detection capabilities. However, the wide use of these techniques is limited by the large costs and dimensions of the exploited sources. In this framework, laser-driven particle acceleration represents a promising alternative to conventional sources since it can address some of their limitations. It relies on the interaction of a super-intense ultrashort laser pulse with a target material to accelerate high-energy electrons and ion bunches. Laser-driven radiation sources are potentially more compact and cheaper than particle accelerators. Moreover, the same laser source can provide different radiations by acting on the target configuration. Besides electrons and ions, high-energy photons and neutrons can be produced by exploiting suitable converter materials. Lastly, the particle energies can be controlled by tuning both the laser intensity and target properties. Here, we show some of the most recent results related to the application of laser-driven radiation sources to materials characterization. Our strategy is based on advanced near-critical Double-Layer Targets (DLT) to enhance the acceleration process. By means of experimental and numerical tools, we show how laser-driven protons, electrons, photons, and neutrons can be exploited for surface and bulk elemental analysis, as well as radiography. Notably, DLTs allow for satisfying the requirements of the techniques, in terms of energies and fluxes, with reduced laser requirements.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127829327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Weijie Fan, Kaiqing Zhang, C. Feng, L. Tu, Minghua Zhao
The harmonic lasing technique was proposed to extend the harmonic up-conversion number, and a reverse taper undulator was then adopted to enhance the performance of the harmonic lasing process. But in a typical experiment, energy spread always plays an essential role in the exponential gain of a high-gain free electron laser. In this paper, phase shifters are employed at the Shanghai Soft X-ray Free Electron Laser Facility to reduce the damage effect of the energy spread and avoid the degradation of the final FEL performances. Three-dimensional simulations are conducted to verify the feasibility of the phase shifters’ ability to prevent high energy spread and obtain FEL with superior coherence.
{"title":"Improvement of reverse-taper enhanced echo-enabled harmonic lasing at SXFEL","authors":"Weijie Fan, Kaiqing Zhang, C. Feng, L. Tu, Minghua Zhao","doi":"10.1117/12.2665920","DOIUrl":"https://doi.org/10.1117/12.2665920","url":null,"abstract":"The harmonic lasing technique was proposed to extend the harmonic up-conversion number, and a reverse taper undulator was then adopted to enhance the performance of the harmonic lasing process. But in a typical experiment, energy spread always plays an essential role in the exponential gain of a high-gain free electron laser. In this paper, phase shifters are employed at the Shanghai Soft X-ray Free Electron Laser Facility to reduce the damage effect of the energy spread and avoid the degradation of the final FEL performances. Three-dimensional simulations are conducted to verify the feasibility of the phase shifters’ ability to prevent high energy spread and obtain FEL with superior coherence.","PeriodicalId":376481,"journal":{"name":"Optics + Optoelectronics","volume":"127 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115624757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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