Conveners
WG1_Parallel
- Stefan Karsch (LMU Munich)
- Riccardo Pompili (LNF)
- Erik Adli (University of Oslo, Norway)
WG1_Parallel
- Erik Adli (University of Oslo, Norway)
- Riccardo Pompili (LNF)
- Stefan Karsch (LMU Munich)
WG1_Parallel
- Erik Adli (University of Oslo, Norway)
- Stefan Karsch (LMU Munich)
- Riccardo Pompili (LNF)
WG1_Parallel
- Erik Adli (University of Oslo, Norway)
- Stefan Karsch (LMU Munich)
- Riccardo Pompili (LNF)
WG1_Parallel
- Stefan Karsch (LMU Munich)
- Erik Adli (University of Oslo, Norway)
- Riccardo Pompili (LNF)
WG1_Parallel
- Riccardo Pompili (LNF)
- Erik Adli (University of Oslo, Norway)
- Stefan Karsch (LMU Munich)
WG1_Parallel
- Riccardo Pompili (LNF)
- Stefan Karsch (LMU Munich)
- Erik Adli (University of Oslo, Norway)
Mr
Carl Andreas Lindstrรธm
(University of Oslo)
9/25/17, 4:00โฏPM
WG1 - Electron Beams from Plasmas
talk
Plasma wakefield acceleration (PWFA) is a promising technology for a compact TeV-scale electron-positron collider. While great progress has been made on PWFA for electrons, the same is not true for positrons. Hollow channel plasma wakefield acceleration (HC-PWFA) is a promising alternative approach for accelerating positrons, where energy is transferred from a drive bunch to a trailing bunch...
Mr
Daniel Ullmann
(University of Strathclyde)
9/25/17, 4:18โฏPM
WG1 - Electron Beams from Plasmas
talk
Fully optically controlled underdense photocathode plasma accelerators (โTrojan Horseโ) has the potential to produce electron bunches with outstanding beam parameters. High charge, ultra low emittance electron beams are generated in a highly tunable nature due to the purely optical injection process. This injection method has been demonstrated at the SLAC national Accelerator Laboratory during...
Mrs
Gabriele Tauscher
(DESY)
9/25/17, 4:36โฏPM
WG1 - Electron Beams from Plasmas
talk
Plasma targets required for wakefield acceleration rely on establishing specific electron density distributions in longitudinal and sometimes transverse direction to allow for control over the quality of accelerated electron bunches. The complex fragmentation dynamics of molecular gases in strong electric fields can have a crucial impact on target as well as injection properties in plasma...
Gregor Loisch
(DESY Zeuthen)
9/25/17, 4:54โฏPM
WG1 - Electron Beams from Plasmas
talk
Since the first considerations on beam driven plasma wakefield acceleration (PWFA) the energy transfer efficiency from drive to witness bunch has been the subject of detailed investigations. The energy transfer efficiency is mainly defined by the ratio of the accelerating fields in the witness to the decelerating fields in the driver bunch, the so called transformer ratio, as well as by the...
Dr
Riccardo Pompili
(LNF)
9/25/17, 5:12โฏPM
WG1 - Electron Beams from Plasmas
talk
Several recent results from the SPARC_LAB test-facility are presented in view of plasma-based experiments. We report about the current status of the plasma wakefield acceleration experiment and first results obtained with the active plasma lens. Regarding the laser-driven scenario, we discuss about some achievements related to the reduction of the relative timing-jitter between the laser pulse...
Mr
Alexander Knetsch
(Deutsches Elektronen-Synchrotron DESY)
9/25/17, 6:00โฏPM
WG1 - Electron Beams from Plasmas
talk
The beam-driven FLASHForward experiment 1 (X-1) aims at the generation of high-brightness electron bunches for photon science applications in several centimeters of plasma, with the plasma acting both as a cathode and accelerator.
The 1 GeV electron-bunch with a peak current of 2.5 kA and a synchronized TW-laser system makes FLASHForward a unique facility[1] to study controlled...
Dr
Kristjan Poder
(DESY)
9/25/17, 6:18โฏPM
WG1 - Electron Beams from Plasmas
talk
Recent experimental electron acceleration results in the self-guiding, self-injecting regime from the 250 TW Gemini laser are presented. Employing an extended f/40 focussing geometry instead of an f/20 resulted in maximum single stage energy gains of up to 2.5 GeV, a more than twofold increase. The generated electron beams carry hundreds of millijoules of energy, with more than 50 % of the...
Mr
Jurjen Couperus
(Helmholtz-Zentrum Dresden - Rossendorf)
9/25/17, 6:36โฏPM
WG1 - Electron Beams from Plasmas
talk
Laser-plasma wakefield acceleration is capable of producing quasi-monoenergetic electron beams reaching into the GeV range with few-femtoseconds bunch duration. Scaling the charge to the nanocoulomb range would yield hundreds of kiloamperes peak-current and stimulate the next generation of radiation sources covering high-field THz, high-brightness X-ray and ฮณ-ray sources, compact FELs and...
Prof.
Simon Hooker
(University of Oxford)
9/25/17, 6:54โฏPM
WG1 - Electron Beams from Plasmas
talk
We reconsider the idea of exciting plasma wakefields by a train of low energy laser pulses, rather than by a single, high-energy pulse. This โmulti-pulse laser wakefield accelerationโ (MP-LWFA) approach is related to the plasma beat-wave accelerator, but has significant advantages since, in principle, the properties of each pulse in the train can be tailored to optimize wake excitation. In...
Dr
Masaki Kando
(KPSI, QST)
9/25/17, 7:12โฏPM
WG1 - Electron Beams from Plasmas
talk
Laser accelerated electron beams are considered to be jitter-free with respect to a probe laser pulse that can be split from the driving laser pulse. Such feature is favorable to apply laser accelerated electron beams for pump-probe experiment. However, we have detected a large delay (~1 ps) of electron beams in a self-injected case when the plasma density is low. Increase of the plasma...
Ms
Andrea Hannasch
(University of Texas at Austin)
9/26/17, 4:00โฏPM
WG1 - Electron Beams from Plasmas
talk
We convert a GeV laser-plasma accelerator (LPA) driven by the Texas Petawatt Laser into a compact, femtosecond-pulsed, tunable gamma-ray source by inserting a 12 to 100ยตm-thick transparent low Z (glass or plastic) foil ~3 cm after the accelerator exit. The foil acts as a plasma mirror (PM) that retro-reflects spent drive laser pulses (1.17 eV) with field strength a0 ~ 0.3 back onto trailing...
Dr
Jonathan Wood
(Imperial College London)
9/26/17, 4:18โฏPM
WG1 - Electron Beams from Plasmas
talk
A self-guided, self-injecting laser wakefield accelerator driven by a 120 TW laser pulse was implemented in a long focal length (f/40) geometry. Electrons were accelerated beyond 1.9 GeV in a 10 mm long plasma while maintaining a betatron source size below 0.5 micrometers. When the plasma length was extended beyond 10 mm a second electron bunch was injected with a high charge per unit...
Dr
Julien Ferri
(Chalmers University of Technology)
9/26/17, 4:36โฏPM
WG1 - Electron Beams from Plasmas
talk
Thanks to the recent progress in laser-driven plasma acceleration of electrons, the ultra-short, compact and spatially coherent X-ray betatron sources based on this technique have been successfully applied to high-resolution imaging in the last few years. However, due to a difficulty to both optimize the electron energy and wiggling, the scope of the betatron sources is limited by a low energy...
Dr
Alexander Debus
(Helmholtz-Zentrum Dresden-Rossendorf)
9/26/17, 4:54โฏPM
WG1 - Electron Beams from Plasmas
talk
We show how to simultaneously solve several long standing limitations of laser-wakefield acceleration that have thus far prevented laser-plasma electron accelerators (LWFA) to extend into the energy realm beyond 10 GeV. Most prominently, our novel Traveling-Wave Electron Acceleration (TWEAC) approach eliminates both the dephasing and depletion constraints. The wakefield driver is a region of...
Dr
Daniel Papp
(ELI-ALPS, ELI-HU Non-Profit Ltd., H-6720 Szeged, Dugonics tรฉr 13., Hungary)
9/26/17, 5:12โฏPM
WG1 - Electron Beams from Plasmas
talk
The study of laser wakefield electron acceleration (LWFA) using mid-IR laser drivers is a promising path for future laser driven electron accelerators, when compared to traditional near-IR laser drivers operating at 0.8 - 1 ฮผm central wavelength (ฮป_laser), as the necessary vector potential (a_0) for electron injection can be achieved with smaller laser powers due to the linear dependence on...
Stefano Romeo
(LNF)
9/26/17, 6:00โฏPM
WG1 - Electron Beams from Plasmas
talk
The possibility to design an high quality beam driven plasma based accelerator in linear regime will be investigated. The high quality requirements for a driving bunch in order to create a plasma wakefield in blow-out regime will be stated. Starting from the very well estabilished cold fluid plasma model a set of equations will be presented in order to describe the fields generated by a low...
Dr
Andrea Renato Rossi
(MI)
9/26/17, 6:18โฏPM
WG1 - Electron Beams from Plasmas
talk
In this contribution we show start-to-end simulations assessing the feasibility of driving Free Electron Laser (FEL) sources with wavelength below 1 nm by plasma boosted, externally injected electron beams of different energies, in the framework of the EuPRAXIA project.
A 30-40 pC, sub micron normalized emittance, electron bunch is extracted from a photo-cathode, accelerated up to 500 MeV and...
Dr
Vladyslav Libov
(DESY)
9/26/17, 6:36โฏPM
WG1 - Electron Beams from Plasmas
talk
Staging of plasma-wakefield accelerators is essential to utilise them in particle physics or other applications requiring high energy beams.
Quality preservation in external beam injection is one of the key missing milestones towards this goal.
This and other topics related to the plasma booster will be studied at FLASHForward, a unique beam-driven plasma wakefield acceleration facility...
Dr
Jorge Vieira
(Instituto Superior Tecnico)
9/26/17, 6:54โฏPM
WG1 - Electron Beams from Plasmas
talk
Plasma accelerators have the potential to drastically reduce the cost and size of conventional devices. An unique property of plasma wakefields is that they can be shaped nearly arbitrarily. Because the wakefield results from the collective motion of electrons, we can access this topological freedom of the plasma by controlling the individual trajectories of plasma electrons.
With...
Prof.
Gaetano Fiore
(Universitร Federico II, and INFN, Napoli)
9/26/17, 7:12โฏPM
WG1 - Electron Beams from Plasmas
talk
Applying a recently developed plane hydrodynamical model to the impact of a very short and intense laser pulse normally onto a diluted plasma at rest, we determine the motion of the plasma electrons shortly after the beginning of the laser-plasma interaction. We thus analytically derive the main features of the induced wake-field wave in the plasma, when and for which electrons the...
Mrs
Marlene Turner
(CERN/TU Graz)
9/27/17, 4:00โฏPM
WG1 - Electron Beams from Plasmas
talk
The AWAKE experiment at CERN aims to create GV/m plasma wakefields over a length of 10 m by using a self-modulated 400 GeV/c proton drive beam from the CERN SPS. The first AWAKE run taking place in 2016 and 2017 is dedicated to study the physics and development of the Self-Modulation Instability within the first few meters of plasma. The two screen measurement aims to measure the radial...
Dr
Mikhail Martyanov
(Max Planck Institut fur Physik, Munich)
9/27/17, 4:18โฏPM
WG1 - Electron Beams from Plasmas
talk
We present a first measurements of microwave coherent transition radiation (CTR) emitted by a SPS proton bunch in AWAKE experiment at CERN. Detailed simulation predicts a significant and experimentally detectable amount of CTR power. Strong signal has been detected in all non-frequency-resolved detectors when proton bunch interacted with a Rubidium plasma. We used three Schottky diodes...
Mr
Falk Braunmueller
(Max-Planck Institute for Physics)
9/27/17, 4:36โฏPM
WG1 - Electron Beams from Plasmas
talk
We present the measurement setup and first results of a waveguide-integrated heterodyne measurement of coherent transition radiation (CTR) in the AWAKE experiment. As a result of the self-modulation instability, a pulse of strong CTR is expected from the modulated proton bunch passing through a CTR-screen. This radiation pulse, which has the length of the modulated part of the bunch and a...
Dr
Kevin PEPITONE
(CERN)
9/27/17, 4:54โฏPM
WG1 - Electron Beams from Plasmas
talk
The AWAKE collaboration prepares a proton driven plasma wakefield acceleration experiment using the SPS beam at CERN. A long proton bunch extracted from the SPS interacts with a high power laser and a 10 m long rubidium vapour plasma cell to create strong wakefields allowing sustained electron acceleration. The electron beam to probe these wakefields is created by an electron accelerator...
Mr
Barney Williamson
(University of Manchester / CERN), Dr
Steffen Doebert
(CERN)
9/27/17, 5:12โฏPM
WG1 - Electron Beams from Plasmas
talk
The proton driven plasma wake-field experiment AWAKE at CERN aims to demonstrate electron acceleration with a long electron bunch in a first series of experiments. After the long shutdown of LHC a second phase for AWAKE is planned starting 2021 called RUN2. In this phase the aim is to demonstrate the acceleration of high quality electron beams therefore a bunch length of the order of 100 fs...
Dr
Andreas Dรถpp
(LMU / MPQ)
9/28/17, 4:00โฏPM
WG1 - Electron Beams from Plasmas
talk
The electron injection process is crucial to the performance of a laser wakefield accelerator as a whole. Here we present recent results and scalings for several controlled injection schemes, i.e. ionization-induced injection, shock-front injection and colliding pulse injection. We demonstrate that the combination of ionization-induced injection and shock-front injection permits the reliable...
Mr
Rozario Savio
(Imperial College London)
9/28/17, 4:18โฏPM
WG1 - Electron Beams from Plasmas
talk
Intense laser pulses (I0^18 W/cm^2) are routinely used to generate electron beams in plasmas using laser wakefield accelerators (LWFAs). It additionally provides a useful source of radiation which is suitable for many imaging applications. Significant research in LWFAs is aimed towards investigating new injection mechanisms which improve the stability of these electron beams/radiation sources...
Mr
Nuno Candeias Lemos
(Lawrence Livermore National Laboratory)
9/28/17, 4:36โฏPM
WG1 - Electron Beams from Plasmas
talk
We show through experiments and supporting simulations the role of direct laser acceleration (DLA) of electrons in a laser wakefield accelerator when ionization injection of electrons is employed. The laser pulse is intense enough to create a nonlinear wakefield and long enough to overlap the electrons trapped in the first accelerating potential well (bucket) of the wakefield. The betatron...
Isabel Gallardo Gonzalez
(Lund University)
9/28/17, 4:54โฏPM
WG1 - Electron Beams from Plasmas
talk
A parametric experimental study of ionization-induced trapping in lรกser wakefield acceleration is presented. Pulses from the multi-terawatt laser at Lund University are focused in a gas cell containing a variable mixture of hydrogen and nitrogen. Electron beams with continuos energy distribution up to 200 MeV are generated. When changing the composition of the gas target, a significant change...
Mr
Henrik Ekerfelt
(Lund University)
9/28/17, 5:12โฏPM
WG1 - Electron Beams from Plasmas
talk
One challenge in the development of laser wakefield accelerators is to
demonstrate sufficient control and reproducibility of the beam
parameters. Many schemes of controlled trapping of electrons have been
proposed and implemented, aiming to improve control and
reproducibility. Here we report on a numerical study of trapping in density
down-ramps, as a continuation of our previous...
Dr
James Holloway
(The University of Oxford)
9/28/17, 6:00โฏPM
WG1 - Electron Beams from Plasmas
talk
Controlling the injection of electrons into laser wakefields will be important for improving the quality of the accelerated bunches, and reducing their shot-to-shot jitter. This is particularly challenging for accelerators operating in the quasi-linear regime since the fields are weaker. We recently proposed the two-pulse ionization injection (2PII) scheme in which electrons ionized from a...
Dr
Erik Adli
(University of Oslo, Norway)
9/28/17, 6:18โฏPM
WG1 - Electron Beams from Plasmas
talk
We report on the experimental observation of the attraction of a beam of ultrarelativistic electrons towards a column of neutral plasma. In experiments performed at the FACET test facility at SLAC we observe that an electron beam moving parallel to a neutral plasma column, at an initial distance of many plasma column radii, is attracted into the column. Once the beam enters the plasma it...
Dr
Alberto Martinez de la Ossa
(DESY)
9/28/17, 6:36โฏPM
WG1 - Electron Beams from Plasmas
talk
Plasma wakefield accelerators can be driven by either an intense laser pulse (LWFA) or a high-current particle beam (PWFA). A plasma accelerator combining both schemes consists of a LWFA providing an electron beam which subsequently drives a PWFA in the highly nonlinear regime. This scenario explicitly makes use of the advantages unique to each method, particularly exploiting the capabilities...
Mr
Max Gilljohann
(Ludwig-Maximilians-Universitรคt Mรผnchen)
9/28/17, 6:54โฏPM
WG1 - Electron Beams from Plasmas
talk
Beam-driven wakefield accelerators have various advantages over laser-driven wakefield accelerators, but the requirements on the particle driver are challenging and met by only a few large-scale accelerators worldwide. However, electron beams from a laser-plasma accelerator are usually inherently well suitable as a driver, which potentially allows studying the physics of beam-driven wakefield...
Mr
Vladimir Minakov
(Budker Institute of nuclear physics)
9/28/17, 7:12โฏPM
WG1 - Electron Beams from Plasmas
talk
AWAKE is a proton-driven plasma wakefield experiment at CERN. Its future goal is to demonstrate a good quality of the accelerated electron beam. One of possible options under consideration for this experiment is a two-stage scenario, in which the electron beam is injected between two plasma cells. In the first plasma cell, the proton beam self-modulates, and the second cell is dedicated for...