Vorsitzende der Sitzung
Plenary session
- Stefan Karsch (Ludwig-Maximilians-Universität München)
Plenary session
- In diesem Block gibt es keine Vorsitzenden
Plenary session: Ions acceleration
- Karl Zeil (Helmholtz-Zentrum Dresden-Rossendorf)
Plenary session: Novel Concepts
- Karl Krushelnick (University of Michigan)
Plenary session
- Wei Lu (Tsinghua University)
Plenary session: X-ray sources
- Andreas Döpp (LMU Munich)
Plenary session
- In diesem Block gibt es keine Vorsitzenden
Plenary session
- Ulrich Schramm (HZDR)
Plenary session: Working Group Summaries and Dawson Talks I
- Victor Malka (Weizmann Institute of Science and CNRS)
Plenary session
- In diesem Block gibt es keine Vorsitzenden
Turning the current experimental laser-plasma accelerator state-of-the-art from a promising technology into mainstream scientific tools depends critically on high-performance, high-fidelity modeling of complex processes that develop over a wide range of space and time scales. While computer simulation tools are already essential to laser-plasma accelerator research, modeling of some of the...
Recent progress on generation and application of the Betatron source at LOA will be shown.
We will first present the production of Betatron radiation using ionization injection. We observed that both the signal and beam profile fluctuations are significantly reduced on this regime. In addition, radiation becomes polarized with a polarization that follows the laser polarization.
In this...
Staging acceleration of plasma accelerators is a critical requirement for compact colliders. The achivements have been made based on two different staging accelerartion schemes (from a LWFA to another LWFA [1] or from a Linac to a PWFA [2]) in recent years, however, the capure efficiency is very low (few percent or even lower). Here we present the first successful demonstration of external...
Plasma wakefield acceleration (PWFA) is a novel acceleration technique with promising prospects for both particle colliders and light sources. However, PWFA research has so far been limited to a few large-scale accelerator facilities worldwide. We present first results on plasma wakefield excitation and acceleration using electron beams generated with the Ti:sapphire lasers ATLAS (LMU, Munich)...
Large energy gain by a witness bunch in a single plasma wakefields stage requires a driver carrying a large amount of energy. Proton bunches produced in large synchrotrons (SPS or LHC at CERN) carry tens to hundreds of kilojoules, but are long, typically 6-12cm. The self-modulation (SM) of the bunch in the plasma [1] transforms the continuous bunch in a train of bunches shorter than, and...
There is intense international interest in the development of high power laser-driven ion sources due to the unique properties of the ion beam and the potential to make these sources compact for applications. This has motivated research into new ion acceleration mechanisms to increase the maximum energies achieved and to control the spectral and divergence properties of the ion beam. In this...
Despite piquing interest in the intense laser-plasma community during the past several decades, monitoring the spatio-temporal evolution of megagauss magnetic fields continues to provide a window to the dynamics of hot electron transport, pivotal to ion acceleration schemes. Besides, these magnetic fields mirror the plethora of electromagnetic waves and instabilities, coupled with the...
Laser driven ion beams provide a promising alternative to conventional accelerators as, in addition to the compactness and possible cost-effectiveness, they exhibit remarkable properties such as high particle flux, short pulse duration and laminarity [1]. However, some of the inherent shortcomings of ion beams driven by target normal sheath acceleration (TNSA) mechanism, such as large...
Plasma mirrors are produced at the surface of solid targets ionized by intense femtosecond laser pulses [1]. Due to their solid-like density, such plasmas specularly reflect these pulses. The main differences with an ordinary mirror is that the critical surface oscillates between +c and –c at each optical cycle and the coupling with the incident beam occurs within a thin layer, that can be...
Laser-driven electron acceleration in gas media [1] provides extreme accelerating fields around 100 GV/m, however, using vacuum should offer even multi-TV/m values. These fields are much beyond that of conventional RF devices. Furthermore, the electron bunches have durations in the few-femtosecond regime, which is also much shorter than from conventional facilities.
A novel approach for the...
A chromatic focusing system combined with chirped laser pulses was used to create a “flying focus” [1]. This advanced focusing scheme provides unprecedented spatiotemporal control over the laser focal volume by enabling a small-diameter laser focus to propagate over 100 times its Rayleigh length. Furthermore, the flying focus decouples the speed at which the peak intensity propagates from the...
Laser-driven charged particle acceleration mechanisms with relativistically intense pulses of ultrashort duration are reviewed for innovative low-density targets either of near critical or near relativistically critical densities. These targets being optimized over thickness and density for given laser intensity with 3D PIC simulations allow generate electrons with maximum total charge and...
Recent studies on laser wakefield acceleration at SJTU will be introduced. Especially two new schemes based on plasma channel will be discussed in detail.
Multistage coupling of laser-wakefield accelerators with independent driving laser pulses is essential to overcome laser energy depletion for high energy applications such as the TeV level electron-positron collider. Currently a staging...
J.L. Martins, J. Vieira, J. Ferri and T. Fülöp
Recent experiments on the production of lasers with Laguerre-Gaussian modes and their interaction with matter have produced high-intensity laser beams with non-zero angular momentum (e.g. [1]). These developments pave the way for exploring laser-wakefield accelerators with structured laser drivers, which provide the access to new acceleration...
Recent progress in laser wakefield acceleration has led to the emergence of a new generation of electron and X-ray sources that may have considerable benefits for a range of scientific, medical and industrial applications. Betatron oscillations of electrons in the strong transverse fields of a laser wakefield accelerator provide X-ray radiation pulses that have a sub-micron source size, are of...
A new generation of accelerator-based hard X/γ-ray sources driven exclusively by laser light will be discussed. One ultrahigh intense CPA laser pulses will be split into two pulse: first used to accelerate electrons by laser-driven plasma wake-field to hundreds-MeV, and second, to collide on the electron for the generation of X/γ-rays by inverse Compton scattering (ICS).
Such all-laser-driven...
We report here on first observations of spontaneous undulator radiation after a 10-m long transport line using a Laser-plasma acceleration (LPA). The line verses to manipulate the singular properties of the produced electron beams (as energy spread, divergence) before being used for lightsource applications. The COXINEL* transport beam line transport and focus a LPA beam in a 2-m long...
The concept of particle acceleration using collective field generated by charge separation of ions and electrons in a plasma, predated the now famous Tajima and Dawson paper. The many avatars of this concept had had a modest success, until Dawson proposed using a relativistic plasma wave to accelerate electrons. The initial response to this paper was either total disbelief or skepticism. It...
Plasma-based accelerators that impart energy gain as high as several GeV to electrons or positrons within a few centimeters have engendered a new class of diagnostic techniques very different from those used in connection with conventional radio-frequency (rf) accelerators. The need for new diagnostics stems from the micrometer scale and transient, dynamic structure of plasma accelerators,...
The structure of a laser plasma wakefield accelerator is intricately linked to the energy distribution of the driving laser pulse. During propagation, the spatial and temporal variations in the plasma refractive index causes modifications to the laser spectrum and spatial-temporal profile. This results in non-linear evolution of the laser pulse, which in turn affects the properties of the...
Extreme field gradients intrinsic to relativistic laser-interactions with thin solid targets enable compact multi-MeV proton accelerators with unique bunch characteristics. Protons are accelerated in TV/m fields that are established within the micrometer-scale vicinity of the high-power laser focus. This initial acceleration phase is followed by ballistic proton bunch propagation with...
