Mr
Osama Mohsen
(Northern Illinios University)
9/27/17, 7:30 PM
WG7 - High Brightness Power Sources: from Laser Technology to Beam Drivers
poster
High-power electron beam could support a wide array of applications including high-flux accelerator-based radiation sources. We have recently investigated the production of high-power electron beam by coupling a field-emission source to a superconducting radiofrequency cavity. In this contribution we describe the concept and demonstrate its performances via numerical simulations. We also...
Dr
Saltanat Sadykova
(Juelich Research Centre)
9/27/17, 7:30 PM
WG6 - Theory and Simulations
poster
We proposed a new scheme for high-intensity laser-driven electron acceleration in a plasma
Our new approach employing the stimulated forward-scattering and injection of relativistic electrons can provide more durable particle acceleration time inside the field of a plasma wave of a much longer length compared to the backward-scattering model where electrons just slip off the wave. For such a...
Spencer Gessner
(CERN)
9/27/17, 7:30 PM
WG5 - High-Gradient Plasma Structures/Advanced Beam Diagnostics
poster
Hollow plasma channels have been proposed as a technique for generating accelerating fields without deleterious transverse forces. In this experiment, we generate meter-scale hollow plasma channels using high-order Bessel profile lasers to ionize a Lithium vapor source. The experiment took place at FACET at SLAC National Accelerator Laboratory. FACET was the only facility in the world capable...
Mr
Anton Golovanov
(Institute of Applied Physics RAS)
9/27/17, 7:30 PM
WG6 - Theory and Simulations
poster
We consider a model of a strongly nonlinear plasma wakefield (a bubble) excited by an intense laser pulse or a relativistic electron bunch propagating in plasma with transverse inhomogeneity. Assuming an arbitrary shape of the electron sheath on the border of the bubble, we obtain a second-order ODE for the boundary of the bubble. We find two approximations when this equation is significantly...
Dr
Elena Svystun
(DESY)
9/27/17, 7:30 PM
WG6 - Theory and Simulations
poster
Over the past decades the production of multi-GeV electron beams from laser-plasma-based accelerators has been successfully demonstrated. However, the overall quality of electron beams produced in plasma accelerators is not yet good enough for the realization of applications such as compact X-ray sources for material processing or medical imaging. To satisfy the requirements of these...
Ms
Joana Martins
(Department of Physics, Chalmers University of Technology, 41296 Gothenburg, Sweden; GoLP/IPFN, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal)
9/27/17, 7:30 PM
WG4 - Applications of Compact and High-Gradient Accelerators
poster
Betatron radiation from laser-wakefield accelerators (LWFA) has shown great potential as a source of high brightness ultra-short radiation. In typical experimental and simulation LWFA setups, the driver is a single laser pulse with a Gaussian profile. However, the recent advances in the field of structured light, in particular in the study and production of light pulses with orbital angular...
Mr
Osama Mohsen
(Northern Illinios University)
9/27/17, 7:30 PM
WG7 - High Brightness Power Sources: from Laser Technology to Beam Drivers
poster
Field emission cathodes are capable of providing electron beams with appealing brightness required for, e.g. the development of compact accelerator-based light sources to serve as injector for high-gradient accelerating structures (e.g. dielectric laser accelerators). A collaboration between Northern Illinois University and the Argonne Center for Nanoscale Materials, has recently developed...
Alessandro Cianchi
(ROMA2)
9/27/17, 7:30 PM
WG5 - High-Gradient Plasma Structures/Advanced Beam Diagnostics
poster
A design study of the diagnostics of a high brightness linac, based on X-band structures, and a plasma accelerator stage, has been delivered in the framework of the EuSparc project. In this paper, we present a conceptual design of the proposed diagnostics, using state of the art systems and new and under development devices.
Maximilian Trunk
(University of Hamburg)
9/27/17, 7:30 PM
WG4 - Applications of Compact and High-Gradient Accelerators
poster
Laser-plasma accelerators provide high accelerating gradients and are
therefore promising candidates as drivers for next generation brilliant
light sources. The LUX Beamline, developed and operated in a close collaboration of the University of Hamburg and DESY aims at producing spontaneous undulator radiation from
laser-plasma generated electron beams. The BEAST II undulator is
based on...
Dr
Thales Silva
(GoLP/Instituto Superior Técnico (Lisbon))
9/27/17, 7:30 PM
WG6 - Theory and Simulations
poster
Plasma accelerators arose as potential candidates for future accelerator technology in the last few decades because of its predicted compactness and low cost. One of the proposed designs for plasma accelerators is based on Laser Wakefield Acceleration (LWFA). However, simulations performed for such systems have to solve the laser wavelength which is orders of magnitude lower than the plasma...
Mr
Amin Ghaith
(SOLEIL)
9/27/17, 7:30 PM
WG4 - Applications of Compact and High-Gradient Accelerators
poster
COXINEL project aims at demonstrating compact Free Electron Laser (FEL), using a Cryogenic Permanent Magnet Undulator (CMPU), and a laser plasma acceleration source. CPMU takes advantage of the magnet’s enhanced performance at low temperature and attains a higher magnetic field, thus enabling to shorten the period and making it applicable for compact FEL applications. The undulator that is...
Marco Marongiu
(ROMA1)
9/27/17, 7:30 PM
WG5 - High-Gradient Plasma Structures/Advanced Beam Diagnostics
poster
Advanced linear accelerator design may use Optical Transition Radiation (OTR) screens to measure beam spot size; for instance, such screens are foreseen in plasma based accelerators (EuPRAXIA@SPARC_LAB) or Compton machines (Gamma Beam Source@ELI-NP). OTR angular distribution strongly depends on beam energy. Since OTR screens are typically placed in several positions along the LINAC to monitor...
Anna Giribono
(ROMA1)
9/27/17, 7:30 PM
WG4 - Applications of Compact and High-Gradient Accelerators
poster
After the last decades of R&D activity, the crucial role of high-brightness RF photoinjectors in the fields of radiation generation and advanced acceleration schemes has been largely established, making them effective candidates to drive plasma-based accelerators as pilots for user facilities. Indeed, these photoinjectors are fundamental for the successful development of external injection...
Mr
Jakob Jonnerby
(University of Oxford)
9/27/17, 7:30 PM
WG5 - High-Gradient Plasma Structures/Advanced Beam Diagnostics
poster
The development of plasma channels with densities below 1x10^18cm-3 is of significant interest to plasma accelerators driven by particle bunches or laser pulses. For the latter it is also important to maintain a low matched spot size Wm over a long interaction region. For several potential applications of plasma accelerators, such as driving light sources, it would also be desirable to operate...
Dr
Richard D'Arcy
(DESY)
9/27/17, 7:30 PM
WG5 - High-Gradient Plasma Structures/Advanced Beam Diagnostics
poster
The FLASHForward project at DESY is an innovative beam-driven plasma-wakefield acceleration experiment, aiming to accelerate electron beams to GeV energies over a few centimetres of ionised gas. These accelerated beams must be of sufficient quality to demonstrate exponential free-electron laser gain; achievable only through rigorous analysis of both the driver and witness beam's longitudinal...
Francesco Filippi
(LNF)
9/27/17, 7:30 PM
WG5 - High-Gradient Plasma Structures/Advanced Beam Diagnostics
poster
Novel plasma acceleration techniques are based on the use of on the excitation of large amplitude waves generated in well controlled plasma sources. The length of the plasma channel, as well as its homogeneity, is crucial for the development of compact accelerators. Gas filled capillary discharge have already proven their ability to confine plasma for long distances with relatively well...
Mr
Niels Delbos
(University of Hamburg / Center for Free Electron Laser Science)
9/27/17, 7:30 PM
WG5 - High-Gradient Plasma Structures/Advanced Beam Diagnostics
poster
Today, many LWFA experiments rely on targets, which operate with short bursts of gas to reduce gas load within the vacuum system to a minimum. However, even in burst mode it requires considerable time to reduce the pressure in the vacuum system to a level low enough for the next laser shot, which is one of the most limiting factors in electron repetition rate. Here, we show a design, which is...
Mr
Norbert Schönenberger
(Friedrich-Alexander-Universität Erlangen-Nürnberg)
9/27/17, 7:30 PM
WG4 - Applications of Compact and High-Gradient Accelerators
poster
Dielectric Laser Accelerators (DLAs) have undergone extensive theoretical and experimental study recently. For all applications of DLAs, the laser-generated near field pattern strongly influences the potential quality of electron beams traversing the DLAs. Although these fields are well understood theoretically and numerically, they have not been observed experimentally. To do so, we use...
Dr
Alexander Debus
(Helmholtz-Zentrum Dresden-Rossendorf)
9/27/17, 7:30 PM
WG4 - Applications of Compact and High-Gradient Accelerators
poster
Generating and controlling ultrashort, pulse-front tilted laser pulses is essential for Traveling-Wave Electron Acceleration (TWEAC),
Traveling-Wave Thomson Scattering (TWTS) and Traveling-Wave Optical FELs (TWTS-OFELs). All these applications require controlling angular and group-delay dispersion, while keeping experimental setups as compact as possible. However, the varying requirements...
Ms
Carola Wirth
(Friedrich Schiller University Jena)
9/27/17, 7:30 PM
WG5 - High-Gradient Plasma Structures/Advanced Beam Diagnostics
poster
In the process of laser wakefield acceleration electrons can be accelerated by the huge longitudinal electric fields (>100GV/m) of a plasma wave structure, reaching GeV-energies on a centimeter-scale. To efficiently use these longitudinal fields of the plasma wave, the wave has to survive over the whole acceleration length meaning the laser intensity has to remain sufficiently high throughout...
Mr
Paul Winkler
(DESY and CFEL, Universität Hamburg)
9/27/17, 7:30 PM
WG5 - High-Gradient Plasma Structures/Advanced Beam Diagnostics
poster
The LUX experiment, built and operated by the University of Hamburg in close cooperation with DESY, produces laser-plasma electron bunches with 5 Hz repetition and is currently upgraded towards the generation of undulator radiation. Here, we present a beam optic for electron energies of 100-400 MeV with a modified, compact electro quadrupole doublet. The magnets feature a gap size as small as...
Mr
Matthew Schwab
(Friedrich-Schiller-University Jena)
9/27/17, 7:30 PM
WG5 - High-Gradient Plasma Structures/Advanced Beam Diagnostics
poster
The multitude of imaging techniques for ultrafast laser-plasma interactions points to the wealth of knowledge that can be gained by having quantitative information about the interaction. Analysis and results on tracking the evolution of magnetic fields in the LWFA structure will be presented. To this end, few-cycle shadowgraphy has been combined with polarization and spectral filtering to...
Mr
Viacheslav Kubytskyi
(LAL, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, France)
9/27/17, 7:30 PM
WG6 - Theory and Simulations
poster
Objective of ESCULAP project is the experimental study of laser-plasma acceleration of relativistic electron bunch. LAL photoinjector (PHIL) will be used to inject electron beam in plasma wakefield created by high power laser (LASERX) in the plasma cell. Control of the quality of the accelerated bunch is one of the main difficulties in laser-plasma acceleration. Extensive modelling of the...
Emanuele Brentegani
(LNF)
9/27/17, 7:30 PM
WG6 - Theory and Simulations
poster
The azimuthal magnetic field generated by the discharge current induced by applying a voltage to the extremities of a gas-filled capillary can be used to focus an electron beam passing through the device. The generated magnetic field gradient can reach values higher than those achieved in electromagnet and even permanent magnet quadrupoles.
In principle, optimal focusing condition is reached...
Dr
Clément Caizergues
(LOA)
9/27/17, 7:30 PM
WG6 - Theory and Simulations
poster
We report on some recent work for the inclusion of more realistic and complex laser pulses in the simulations of the Quasi-static PIC code WAKE and the PIC code CALDER-CIRC. Optical aberration in the driving laser pulse can deteriorate the quality of the accelerated electron bunch and limit the acceleration length. In the present work we study the influence of some perturbations in the phase...
Dr
Helen Barminova
(NRNU MEPhI)
9/27/17, 7:30 PM
WG4 - Applications of Compact and High-Gradient Accelerators
poster
For the experiments with cylindrical targets irradiated by high energy intense ion beams which are actual in some fundamental and applied researches (laboratory astrophysics, medicine, etc) it is necessary to shape the irradiating beam with hollow geometry. Among the various methods of hollow beam formation the wobbling is of interest. The deflecting plates or RF-cavities with phase shift of...
Hesham FARES
9/27/17, 7:30 PM
WG4 - Applications of Compact and High-Gradient Accelerators
poster
In this work, we investigate the spontaneous emission process and its detrimental effects on coherent free-electron laser (FEL) emission. In our model, the electron dynamics are described by a discrete Wigner distribution coupled to Maxwell equations. For an FEL operating in the quantum regime of single photon recoil, insights on the variation of momentum distribution, bunching factor, and...
Mr
Thomas Heinemann
(Uni Strathclyde / DESY)
9/27/17, 7:30 PM
WG6 - Theory and Simulations
poster
Plasma wakefield accelerators driven by a beam of charged particles usually rely on a pre-formed plasma, such as a narrow channel of optically pre-ionized ambient gas utilizing a powerful laser system. While this method enables to provide plasma lengths and thus accelerating distances on the meter-scale, the width of the channel potentially, deliberately or inadvertently, varies significantly....
181.
Photon beamline for a soft x-ray FEL driven by high gradient acceleration at EuPRAXIA@SPARC_LAB
Fabio Villa
(LNF)
9/27/17, 7:30 PM
WG4 - Applications of Compact and High-Gradient Accelerators
poster
We are proposing a facility based on high gradient acceleration via x-band RF structures and plasma acceleration. We plan to reach an electron energy of the order of 1 GeV, enough to drive a Free Electron Laser in the so called “water window” (2-4 nm). At the end of the beamline we will have a user end station where we plan to do coherent imaging, laser ablation and pump-probe experiments. We...
Mr
Philipp Messner
(University of Hamburg)
9/27/17, 7:30 PM
WG5 - High-Gradient Plasma Structures/Advanced Beam Diagnostics
poster
Laser-plasma accelerator are promising candidates to provide ultra-relativistic electron beams for compact light sources. However, the generation of stable, high quality electron beams which are necessary to drive such a compact light source is challenging. The main determining factors are thereby the plasma properties which are given by the structure of the cm-scaled plasma target itself....
Ms
Anna-Maria Bachmann
(CERN)
9/27/17, 7:30 PM
WG5 - High-Gradient Plasma Structures/Advanced Beam Diagnostics
poster
AWAKE develops a new plasma wakefield accelerator using the CERN SPS proton bunch as a driver. The proton bunch propagates through a 10m long rubidium plasma, induced by an ionizing laser pulse that also seeds the wakefields for the self-modulation instability (SMI). Current diagnostics for the occurrence of the SMI focus on the proton bunch.
The SMI transforms the bunch in a train with...
Ms
Giovanna Campogiani
(INFN-Roma1)
9/27/17, 7:30 PM
WG4 - Applications of Compact and High-Gradient Accelerators
poster
The Gamma Beam system (GBS) is a high brightness LINAC to be installed in Magurele (Bucharest) at the ELI-NP (Extreme Light Infrastructure - Nuclear Physics) newly build laboratory. The accelerated electrons, with energies ranging from 280 to 720 MeV, will be made to collide with a high power laser to produce tunable high energy photons (0.2 MeV-20MeV ) with high intensity (1013 photons/s),...
Dr
Helen Barminova
(NRNU MEPhI)
9/27/17, 7:30 PM
WG6 - Theory and Simulations
poster
The ion beams extracted from the laser ion source are characterized by complicated charge state distribution of the ions. As a rule, for the aims of the specific experiment only one of the charge states is needed, so the charge state separation is a part of the beam formation. To predict the behavior of intense ion bunch with various distributions of the charge states in magnetic field of the...
Yi Longqing
9/27/17, 7:30 PM
WG4 - Applications of Compact and High-Gradient Accelerators
poster
Magnetic reconnection (MR) in the relativistic regime is generally thought to be responsible for powering rapid bursts of non-thermal radiation in astrophysical events such as pulsar winds and flares of blazars. Due to the difficulty in making direct measurements in astrophysical systems or achieving such extreme energy density conditions that are necessary to observe relativistic MR in...
Mr
Christopher Arran
(University of Oxford)
9/27/17, 7:30 PM
WG5 - High-Gradient Plasma Structures/Advanced Beam Diagnostics
poster
Frequency Domain Holography (FDH) has proved an effective way of measuring plasma wakefields driven by short laser pulses. With this technique, chirped probe and reference pulses are positioned temporally before and after a driving laser pulse, and co-propagate with it through the plasma. Information about the plasma wave is encoded in the transmitted probe pulse, and may be retrieved by...
Mr
Fabian Batsch
(CERN)
9/27/17, 7:30 PM
WG5 - High-Gradient Plasma Structures/Advanced Beam Diagnostics
poster
The AWAKE experiment uses the seeded self-modulation (SSM) to drive large amplitude wakefields in a plasma. The seed for the wakefields is a sharp ionizing front located near the middle of the proton bunch. It is created by an intense laser pulse ionizing Rubidium (Rb). For electron acceleration, the electron bunch must be injected into the accelerating and focusing phase of the wakefields,...
Mr
Petr Tuev
(Novosibirsk State University)
9/27/17, 7:30 PM
WG6 - Theory and Simulations
poster
Laser plasma wakefield acceleration is a hot topic of research in new acceleration methods. A lot of laboratories with suitable lasers investigate the laser-plasma interaction in many configurations. Nevertheless, numerical simulation is still a necessary tool to study processes occurring in the interaction region. Full PIC codes are the most powerful instruments, but they are computationally...
Mr
Christopher Arran
(University of Oxford)
9/27/17, 7:30 PM
WG5 - High-Gradient Plasma Structures/Advanced Beam Diagnostics
poster
The next generation of Laser Wakefield Acceleration experiments require guiding laser drivers with longer and lower density plasma structures. We present theory and simulations describing an entirely optical mechanism of creating plasma channels 10s of centimetre long and with on axis plasma densities below 10^17 cm^-3. These channels would be suitable for guiding 10 GeV scale LWFA stages and...
Mr
Lars Goldberg
(Deutsches Elektronen-Synchrotron DESY)
9/27/17, 7:30 PM
WG5 - High-Gradient Plasma Structures/Advanced Beam Diagnostics
poster
One of the key issues for the generation of stable and reproducible beams in plasma particle accelerators is control of the initial plasma density distribution. Not only the longitudinal but also the transverse density profile, the species distribution, as well as fragmentation and ionisation dynamics can have significant impact on the generated beams. In particular in increasingly complex...
Ms
Yangmei Li
(University of Manchester, Cockcroft Institute)
9/27/17, 7:30 PM
WG6 - Theory and Simulations
poster
Hollow plasma has been introduced into the proton-driven plasma wakefield accelerator to overcome the issue of beam quality degradation caused by the nonlinear transverse wakefields varying in radius and in time in uniform plasma. It has been demonstrated that the electrons can be accelerated to energy frontier with well-preserved beam quality in a long hollow plasma channel. However, this...
Francesco Filippi
(LNF)
9/27/17, 7:30 PM
WG5 - High-Gradient Plasma Structures/Advanced Beam Diagnostics
poster
One of the key elements of the PWFA blowout regime is the strong, linear focusing provided by the ion density. One advantage of this focusing is its extraordinary strength whose gradient is proportional to the local background plasma density, permitting adiabatic focusing schemes in future compact linear colliders. Plasma density variations can be locally obtained in gas-filled capillaries by...
Mr
Matthias Schnepp
(Center for Free-Electron Laser Science and Department of Physics, University of Hamburg)
9/27/17, 7:30 PM
WG7 - High Brightness Power Sources: from Laser Technology to Beam Drivers
poster
Laser-plasma based acceleration has matured into a technique providing high-energy electron beams able to drive undulator-based x-ray light sources. The LUX beamline, currently built up in a collaboration between University of Hamburg, DESY and ELI-Beamlines, is designed to be such a light source. The plasma acceleration stage is driven by the 5 Hz 200 TW laser system ANGUS. Recently first...
Dr
Arnaud Beck
(Laboratoire Leprince Ringuet)
9/27/17, 7:30 PM
WG6 - Theory and Simulations
poster
SMILEI is an open-source, particle-in-cell code. It is designed for high performances on super-computers and applied to a wide range of physics-related studies: from relativistic laser-plasma interaction to astrophysical plasmas. It is co-developed by both physicists and HPC experts. This poster presents the main structure of the code, its features, parallel performances and provide several...
Dr
Mikhail Martyanov
(Max Planck Institut fur Physik, Munich)
9/27/17, 7:30 PM
WG5 - High-Gradient Plasma Structures/Advanced Beam Diagnostics
poster
The AWAKE experiment relies on the self modulation instability (SMI) of a long (ns) proton bunch in a plasma. The self modulation of the bunch is responsible for resonant driving of the plasma wakefields and the proton bunch develops sub structures with a scale on the order of the plasma wavelength (~1.2 mm in AWAKE) and the square root of the plasma density.
Optical Transition Radiation as...
Alexander Sosedkin
(Novosibirsk State University)
9/27/17, 7:30 PM
WG6 - Theory and Simulations
poster
LCODE, a freely-distributed parallel quasistatic 2D3V code, has helped pushing plasma wakefield acceleration forward for decades. It empowers researchers with a numerically efficient simulation tool excelling at long-term propagation of ultrarelativistic particle beams in plasmas. While its performance-focused principles, techniques and tricks make it possible to simulate frontier plasma...
