Dr
Anthony Dyson
(Oxford University)
9/16/15, 7:30โฏPM
WG5 - High-gradient plasma structures/Advanced beam diagnostics
poster
We describe a Compact Marx Bank (CMB) that provides 20 kV, 500A pulses of around 100 ns duration. This is used to drive a gas-filled capillary discharge plasma of density 1018 cm๔3. This plasma cools at the capillary walls and so forms a positive GRIN waveguide that can guide intense laser pulses over lengths of up to 30 mm. The CMB is triggered with a high speed solid state switch with less...
Mr
Fabian Batsch
(Max-Planck-Institute for Physics)
9/16/15, 7:30โฏPM
WG5 - High-gradient plasma structures/Advanced beam diagnostics
poster
For the AWAKE experiment, one needs an online and automatic rubidium (Rb) vapor density measurement device. Due to the laser tunnel-ionization of the Rb vapor, the plasma density is equal to the vapor density, which is measured instead. The diagnostic consists of a Mach-Zehnder interferometer built of single mode fibers and a fiber spectrograph. We use the hook method adapted from oblique to...
Dr
Alessandro Curcio
(LNF)
9/16/15, 7:30โฏPM
WG5 - High-gradient plasma structures/Advanced beam diagnostics
poster
Several radiation-based diagnostics for Laser Plasma Acceleration are presently studied in laboratories around the world. Of these the most interesting seem to be the Betatron Radiation, Thomson Scattering and Radiation Transition. In the presentation will highlight the potential of these techniques together with their limits and feasibility. In particular the Betatron Radiation as tool to...
Vladimir Shpakov
(LNF)
9/16/15, 7:30โฏPM
WG5 - High-gradient plasma structures/Advanced beam diagnostics
poster
Beam diagnostics, both longitudinal and transverse, represents a crucial point for Plasma WakeField Acceleration (PWFA) with external injection. Matching conditions for the beam before the injection into the plasma and the preservation of beam quality at the plasma exit, both require precise beam size measurements. Betatron radiation emitted by the beam during acceleration in the plasma...
Dr
Charlotte Palmer
(DESY)
9/16/15, 7:30โฏPM
WG5 - High-gradient plasma structures/Advanced beam diagnostics
poster
We report on the development of a broadband transition radiation (TR) diagnostic for use during plasma wakefield experiments at FLASHForward. Here, 1~GeV, 50~fs electron bunches will drive a plasma wakefield accelerator, generating ultra-short ($\sim~$fs) `witness' electron bunches with energies $\leq~5$~GeV.
TR is generated whenever a charged particle travels between materials with...
David Cesar
(UCLA-PBPL)
9/16/15, 7:30โฏPM
WG5 - High-gradient plasma structures/Advanced beam diagnostics
poster
RF photoguns are an appealing source for injecting electrons into a plasma wake because they can produce extremely high brightness beams. In order to capture a large percentage of the beam, we find that it is necessary to pre-bunch the beam close to the plasma frequency. We determine the plasma parameters necessary to capture and accelerate electrons from a table-top sized RF beamline such as...
Dr
Mikhail Martyanov
(Max Planck Institut fur Physik, Munich)
9/16/15, 7:30โฏPM
WG5 - High-gradient plasma structures/Advanced beam diagnostics
poster
AWAKE project at CERN is an international collaboration of many institutes worldwide and it aims to accelerate electrons in a plasma wake excited by SPS proton bunch. The length of the proton bunch is much longer then plasma wavelength 1-3 mm for the considered plasma concentration (1-10)e14 cm-3, and various numerical simulations showed that charge density within a bunch tends to be radially...
Ms
Gabriele Tauscher
(DESY)
9/16/15, 7:30โฏPM
WG5 - High-gradient plasma structures/Advanced beam diagnostics
poster
Plasma-based accelerators offer the chance of dramatically shrinking the size and cost of future particle accelerators and free-electron lasers. In the FLASHForward project a high-power laser creates a plasma inside which an electron bunch from the FLASH linac drives large amplitude wakefields. Disentangling the processes of ionisation and excitation of wakefields enables improved control...
Mrs
Daria Pugacheva
(JIHT RAS)
9/16/15, 7:30โฏPM
WG5 - High-gradient plasma structures/Advanced beam diagnostics
poster
The acceleration of highly polarized electron beams are widely used in state-of-the-art high-energy physics experiments. In this work, the dynamics of the electron spin precession in the process of laser wakefield electron acceleration in plasma channel is considered. The spin precession of an electron is described by the Thomas-Bargman-Michel-Telegdi equations taking into account the...
Dr
Joshua Moody
(Max Planck Institute for Physics)
9/16/15, 7:30โฏPM
WG5 - High-gradient plasma structures/Advanced beam diagnostics
poster
AWAKE is a proof-of-principle proton driven plasma wakefield electron acceleration experiment that requires a 10 meter long plasma source with a density of 1014-1015 cm-3. To create this plasma, an ultrafast terawatt laser pulse ionizes rubidium vapor at the required density. Although the ionization process can be described as a form of tunnel ionization, the Keldysh parameter is on the order...
Dr
Imre Ferenc Barna
(Wigner Research Center of the Hungarian Academy of Sciences)
9/16/15, 7:30โฏPM
poster
The key element in the Proton-Driven-Plasma-Wake-Field-Accelerator (PWFA) experiments is the generation of highly uniform plasma from Rubidium vapor. In the Wigner Research Center of the Hungarian Academy of Sciences we developed an experimental facility which is capable to create an extended - a 25 cm long rubidium plasma via laser interaction. Some properties of the laser plasma can be...
Mrs
Marlene Turner
(CERN/TU Graz)
9/16/15, 7:30โฏPM
WG5 - High-gradient plasma structures/Advanced beam diagnostics
poster
AWAKE, the Advanced Proton-Driven Plasma Wakefield Acceleration Experiment, is a proof-of-principle R&D experiment at CERN using a 400GeV proton beam from the CERN SPS (sigmaz=12mm) which will be sent into a 10m long plasma section with a nominal density of ~7e14 1/cm^3 (plasma wavelength lambda=1mm).
A proton beam with a length much longer than the plasma wavelength experiences a...
Mrs
Atefeh Joulaei
(Max-Planck Institute for Physics)
9/16/15, 7:30โฏPM
WG5 - High-gradient plasma structures/Advanced beam diagnostics
poster
AWAKE is a proof-of-principle proton-driven plasma wakefield electron acceleration experiment at CERN. The purpose of the experiment is to demonstrate the acceleration of electrons from MeV to GeV scale within a 10 meter plasma with an electron density of 1014-1015 cm-3. An ultrashort terawatt laser pulse ionizes rubidium vapor, creating plasma and seeding the self-modulation instability with...
Mr
Christopher Thornton
(University of Oxford)
9/16/15, 7:30โฏPM
WG5 - High-gradient plasma structures/Advanced beam diagnostics
poster
Gas-filled capillary discharge waveguides have been used very successfully to extend the length over which acceleration can be maintained in a laser-plasma accelerator, leading to the first generation of 1 GeV beams and, recently, the production of 4 GeV electrons.
We present new transverse interferometric measurements of the plasma channel formed in a gas-filled capillary waveguide driven...
Mr
Nicolas Delerue
(LAL, CNRS and Universitรฉ Paris-Sud 11)
9/16/15, 7:30โฏPM
WG5 - High-gradient plasma structures/Advanced beam diagnostics
poster
We report on the recent studies of Smith-Purcell radiation aimed at developing a longitudinal bunch profile monitor. In particular we report on first measurements of the polarization and azimuthal distribution of the radiation. We also report on studies done in the linac of synchrotron SOLEIL to measure the distribution of Smith-Purcell radiation. Using these results we update our plan to...
Francesco Filippi
(ROMA1)
9/16/15, 7:30โฏPM
WG5 - High-gradient plasma structures/Advanced beam diagnostics
poster
The high accelerating gradient of the plasma-based techniques is one of the most attractive property of this new generation of particle accelerators. The quality and the energy gain of the accelerated beam depend on the electron density of the plasma and its variation. Therefore in order to control the
efficiency of the acceleration and the quality of the accelerated beam the knowledge of the...
Mr
Karl Rieger
(Max Planck Institute for Physics Munich)
9/16/15, 7:30โฏPM
WG5 - High-gradient plasma structures/Advanced beam diagnostics
poster
The AWAKE experiment relies on the self-modulation instability of a long (ns) proton bunch in a plasma. The self-modulation of the bunch is responsible for resonantly driving the plasma wakefields. The proton bunch develops a density sub-structure with a scale on the order of the plasma wavelength (~1.2 mm) and thus scales with the square root of the plasma density. To detect this...
Mr
Max Hachmann
(DESY)
9/16/15, 7:30โฏPM
WG5 - High-gradient plasma structures/Advanced beam diagnostics
poster
The linear accelerator REGAE at DESY produces short and low charged electron bunches, on the one hand to resolve the excitation transitions of atoms temporally by pump probe electron diffraction experiments and on the other hand to investigate principal mechanisms of laser plasma acceleration. For both cases a high quality electron beam is required which can be identified with a small beam...
Dr
Saltanat Sadykova
(Juelich Research Centre)
9/16/15, 8:00โฏPM
WG6 - Theory and simulations
poster
We propose a new approach to high-intensity relativistic laser-driven electron acceleration in a plasma. Here, we demonstrate that a plasma wave generated by a stimulated forward-scattering of an incident laser pulse can be in the longest acceleration phase with injected relativistic beam electrons. This is why the plasma wave has the maximum amplification coefficient which is determined by...
Mr
Kieran Hanahoe
(University of Manchester)
9/16/15, 8:00โฏPM
WG6 - Theory and simulations
poster
Theory and particle-in-cell simulation results for beam loading using at the proposed Plasma Accelerator Research Station (PARS) at Daresbury Laboratory are presented. Results show an acceleration gradient of approximately 2 GV/m is possible, and the variation of the final energy spread and emittance of the witness beam with different beam and plasma parameters is investigated.
Mr
Vladimir Minakov
(Novosibirsk State University)
9/16/15, 8:00โฏPM
WG6 - Theory and simulations
poster
Evolution of the plasma wakefield in transversely non-uniform plasmas is numerically studied in terms of energy fluxes in the co-moving frame. For stationary transverse inhomogeneities, two effects are observed. First, the wave energy is always pushed out of the vicinity of local density extrema. In both V-shaped density channels and ษ
-shaped density crests the behavior of energy fluxes is...
Mr
Andrรกs Pocsai
(Wigner Research Center of the Hungarian Academy of Sciences)
9/16/15, 8:00โฏPM
WG6 - Theory and simulations
poster
An effective theory of laserโplasma based particle acceleration is presented. Here we treated the plasma as a continuous medium with an
index of refraction n_m in which a single electron propagates. We studied the properties of the electron motion due to the Lorentz force and the relativistic equations of motion were numerically solved and analysed. We compared our results to PIC simulations...
Ms
divya singh
(university of delhi)
9/16/15, 8:00โฏPM
WG6 - Theory and simulations
poster
Now a days Terahertz frequency domain of electromagnetic spectrum has been a very important and integrated part of technology based on their application as a potential field of research due to its viability. Terahertz radiation is nonionizing electro-magnetic radiation with submilimeter wavelength, which can be used non-invasively to several applications. here in the present paper we study...
Mr
Robert Shalloo
(JAI, University of Oxford)
9/16/15, 8:00โฏPM
WG6 - Theory and simulations
poster
In multi-pulse laser wakefield acceleration a plasma wave is driven by a train of laser pulses separated by the plasma period. This allows laser-driven plasma accelerators to be driven by emerging technologies, such as fibre and thin-disk lasers, which can generate low-energy pulses at kilohertz repetition rates with high efficiency.
As a first test of this concept we plan to convert single...
Mr
Petr Tuev
(Novosibirsk State University)
9/16/15, 8:00โฏPM
WG6 - Theory and simulations
poster
This work is related to the AWAKE project at CERN. It is a plasma wakefield acceleration experiment designed to test the possibility of transferring energy from the 400 GeV proton beam to electrons through a plasma. In the experiment, the vacuum beam line and the plasma cell have different gas pressures, which results in a plasma density transition region between them. Electron trapping is...
Dr
Ashutosh Sharma
(ELI-ALPS, Szeged, Hungary)
9/16/15, 8:00โฏPM
WG6 - Theory and simulations
poster
Laser acceleration of ions from both solid and gaseous target attracts a great attention because of its potential medical applications including the hadron therapy. The recent development of ELI facility which will host the laser system capable of generating ultra-short pulses in the multiterawatt or even petawatt power range at high repetition rate, which is crucial for the investigation of...
Mr
Fabrizio Bisesto
(INFN-LNF),
Massimo Petrarca
(ROMA1)
9/16/15, 8:00โฏPM
WG7 - Laser technology for advanced accelerators
poster
The EXIN project is under development within the SPARC_LAB facility of the National Laboratory of Frascati (LNF-INFN).ย
This project aims to accelerate preexisting electron bunches with high brightness exploiting the wakefield plasma acceleration technique while preserving the initial quality.ย The electron bunches are generated by the SPARC photo injector with an energy of about 80MeV, a...
Alexander Sosedkin
(Novosibirsk State University)
9/16/15, 8:00โฏPM
WG6 - Theory and simulations
poster
LCODE is a freely-distributed code for simulating plasma wakefield acceleration, notable for its numerical stability, performance optimizations and bundling an extensive set of in-built diagnostics.
Using the quasistatic approximation it calculates the plasma response and the particle beam evolution in either axisymmetric or plain 2D geometry. The beam is modelled with fully relativistic...
Mr
Djemai Bara
(CDTA)
9/16/15, 8:00โฏPM
WG6 - Theory and simulations
poster
A theoretical model is developed to describe self-similar plasma expansion into vacuum with two electron temperature distribution function. The cold electrons are modeled with a Maxwellian distribution while the hot ones are supposed to be nonthermal obeying a kappa distribution function. It is shown that ion density and velocity profiles depend only on cold electrons in early stage of...
Ms
Ligia Diana Amorim
(GoLP/Instituto de Plasmas e Fusรฃo Nuclear, Instituto Superior Tรฉcnico, Universidade de Lisboa)
9/16/15, 8:00โฏPM
WG6 - Theory and simulations
poster
Plasma-based wakefield accelerators are promising configurations for future generation linear colliders. The E-209 experiment [1], currently running at SLAC-FACET was proposed to investigate key-physics of the self-modulated [2] plasma wakefield accelerator using uncompressed lepton bunches. Recent E-209 results show evidence of the self-modulation instability using several diagnostics...
Mr
Matthias Schnepp
(Center for Free-Electron Laser Science & Department of Physics, Hamburg University)
9/16/15, 8:00โฏPM
WG7 - Laser technology for advanced accelerators
poster
Within the LAOLA Collaboration, the University of Hamburg and DESY work closely together to combine university research in the field of laser-plasma acceleration with the expertise of a large and well-established accelerator facility. We present in this poster a summary of hardware and software based changes to the 200 TW ANGUS laser system to increase ease of operation and stability. We will...
Anton Golovanov
(Lobachevsky State University of Nizhni Novgorod; Institute of Applied Physics RAS)
9/16/15, 8:00โฏPM
WG6 - Theory and simulations
poster
An analytical-piecewise homogeneous model for side injection of an external electron beam into linear plasma waves is developed. The dynamics of transverse betatron oscillation of the electrons are studied. Based on the characteristics of the transversal motion the longitudinal motion of the electrons is described. The results of the analytical model are verified by numerical simulations in...
Dr
Tino Rublack
(DESY)
9/16/15, 8:00โฏPM
WG7 - Laser technology for advanced accelerators
poster
The use of high brightness electron beams in Free Electron Laser (FEL) applications is of increasing importance. One of the most promising methods to generate such beams is the shaping of the photo cathode laser pulses. It was already demonstrated that temporal and transverse flat-top laser pulses can produce very low emittance beams. Theoretical considerations supported by simulations suggest...
Mr
wei yang
(Synchrotron SOLEIL)
9/16/15, 8:00โฏPM
WG7 - Laser technology for advanced accelerators
poster
W. Yang, F. Briquez, T. El Ajjouri, F. Marteau, M. Vallรฉau, M. Labat, A. Loulergue, M. E. Couprie
COXINEL (COherent X-ray source INferred from Electron accelerated by Laser) aims at demonstrating Free Electron Laser (FEL) amplification with a laser Wakefield Accelerator, thanks to a specifically designed transfer line to manipulate the electron beam properties. The line will start with...
Prof.
Renato Fedele
(NA)
9/16/15, 8:00โฏPM
WG6 - Theory and simulations
poster
The interaction of a multi-petawatt, pancake-shaped laser pulse with an unmagnetized plasma is studied analytically and numerically in the blowout regime of fully relativistic electron jitter velocities and in the context of the laser wakefield acceleration scheme. A set of novel nonlinear equations is derived using a three-timescale description, with an intermediate timescale associated with...
Mr
Patrick Lee
(LPGP)
9/16/15, 8:00โฏPM
WG6 - Theory and simulations
poster
The Particle-in-cell (PIC) Framework WARP was recently adapted to describe Laser Wakefield Acceleration. It is also well adapted to the modeling of the CILEX project, in which experiments on electron acceleration by multi-stages LWFA using multi-PW APOLLON are in preparation. The strength of this code lies in its ability to treat the whole aspect of a multi-stage accelerator, beginning from...
Mr
Roman Spitsyn
(Novosibirsk State University)
9/16/15, 8:00โฏPM
WG6 - Theory and simulations
poster
Performance of a newly developed quasistatic model of a laser pulse is studied. The code solves the envelope equation for the vector-potential with the five-point Thomas algorithm. The finite-difference scheme has the second order by the transverse coordinate, the third order by the longitudinal coordinate, and the first order by the time step. The stability region of the scheme is studied...
