Plasma channel
View article
Multistage coupling of independent laser-plasma accelerators Open
Laser-plasma accelerators (LPAs) are capable of accelerating charged particles to very high energies in very compact structures. In theory, therefore, they offer advantages over conventional, large-scale particle accelerators. However, the…
View article
Beyond the ponderomotive limit: Direct laser acceleration of relativistic electrons in sub-critical plasmas Open
We examine a regime in which a linearly polarized laser pulse with relativistic intensity irradiates a sub-critical plasma for much longer than the characteristic electron response time. A steady-state channel is formed in the plasma in th…
View article
Plasma action on helium flow in cold atmospheric pressure plasma jet experiments Open
In this work, helium flow modifications, visualized by schlieren imaging, induced by the plasma generated in a plasma jet have been studied in conditions used for biomedical treatments (jet being directed downwards with a low helium flow r…
View article
Hydrodynamic optical-field-ionized plasma channels Open
We present experiments and numerical simulations which demonstrate that fully ionized, low-density plasma channels could be formed by hydrodynamic expansion of plasma columns produced by optical field ionization. Simulations of the hydrody…
View article
Multistage Coupling of Laser-Wakefield Accelerators with Curved Plasma Channels Open
Multistage coupling of laser-wakefield accelerators is essential to overcome laser energy depletion for high-energy applications such as TeV-level electron-positron colliders. Current staging schemes feed subsequent laser pulses into stage…
View article
Numerical study on propagation mechanism and bio‐medicine applications of plasma jet Open
In this study, the propagation mechanism of plasma jet and some bio‐medical applications are investigated by two‐dimensional numerical model. The key equations of plasma physics and chemistry related with plasma jet are firstly introduced.…
View article
Relativistic laser driven electron accelerator using micro-channel plasma targets Open
We present an experimental demonstration of the efficient acceleration of electrons beyond 60 MeV using micro-channel plasma targets. We employed a high-contrast, 2.5 J, 32 fs short pulse laser interacting with a 5 μm inner diameter, 300 μ…
View article
High-charge relativistic electron bunches from a kHz laser-plasma accelerator Open
International audience
View article
Universal scalings for laser acceleration of electrons in ion channels Open
We analytically investigate the acceleration of electrons undergoing betatron oscillations in an ion channel, driven by a laser beam propagating with superluminal (or luminal) phase velocity. The universal scalings for the maximum attainab…
View article
Matched Guiding and Controlled Injection in Dark-Current-Free, 10-GeV-Class, Channel-Guided Laser-Plasma Accelerators Open
We measure the high-intensity laser propagation throughout meter-scale, channel-guided laser-plasma accelerators by adjusting the length of the plasma channel on a shot-by-shot basis, showing high-quality guiding of 500 TW laser pulses ove…
View article
Brilliant petawatt gamma-ray pulse generation in quantum electrodynamic laser-plasma interaction Open
We show a new resonance acceleration scheme for generating ultradense relativistic electron bunches in helical motions and hence emitting brilliant vortical γ -ray pulses in the quantum electrodynamic (QED) regime of circularly-polarized (…
View article
Towards the optimisation of direct laser acceleration Open
Experimental measurements using the OMEGA EP laser facility demonstrated direct laser acceleration (DLA) of electron beams to (505 ± 75) MeV with (140 ± 30) nC of charge from a low-density plasma target using a 400 J, picosecond duration p…
View article
Measurement of Transverse Wakefields Induced by a Misaligned Positron Bunch in a Hollow Channel Plasma Accelerator Open
Hollow channel plasma wakefield acceleration is a proposed method to provide high acceleration gradients for electrons and positrons alike: a key to future lepton colliders. However, beams which are misaligned from the channel axis induce …
View article
The unexpected role of evolving longitudinal electric fields in generating energetic electrons in relativistically transparent plasmas Open
Here, superponderomotive-energy electrons are observed experimentally from the interaction of an intense laser pulse with a relativistically transparent target. For a relativistically transparent target, kinetic modeling shows that the gen…
View article
Electron acceleration by a radially-polarized laser pulse in a plasma micro-channel Open
Encouraged by recent advances in radially-polarized laser technology, simulations have been performed of electron acceleration by a tightly-focused, ultra-short pulse in a parabolic plasma micro-channel. Milli-joule laser pulses, generated…
View article
Mechanisms responsible for the initiation of a fast breakdown in an atmospheric discharge Open
Here, the initial stage of the fast electrical breakdown of an air gap with a pin-to-plane electrode geometry is studied on a nanosecond time scale using multi-frame laser probing with an exposure time of 70 ps and spatial resolution as hi…
View article
Meter-scale conditioned hydrodynamic optical-field-ionized plasma channels Open
We demonstrate through experiments and numerical simulations that low-density, low-loss, meter-scale plasma channels can be generated by employing a conditioning laser pulse to ionize the neutral gas collar surrounding a hydrodynamic optic…
View article
Extremely intense laser-based electron acceleration in a plasma channel Open
Laser pulses of extreme intensities ($I>10^{22}~ \\mathrm{W/cm^2}$) are about to become available in the laboratory. The prepulse of such a laser can induce a plasma expansion that generates a low-density channel in near-critical gas jets.…
View article
State-of-the-Art and Advancement Paths for Inductive Pulsed Plasma Thrusters Open
An inductive pulsed plasma thruster (IPPT) operates by pulsing high current through an inductor, typically a coil of some type, producing an electromagnetic field that drives current in a plasma, accelerating it to high speed. The IPPT is …
View article
Femtosecond filamentation of optical vortices for the generation of optical air waveguides Open
We study the filamentation in air of multi-millijoule optical vortices and compare them with the classical filamentation regime. The femtosecond vortex beam generates multiple plasma filaments organized in a cylindrical geometry. This plas…
View article
Recent developments in thermal characteristics of surface dielectric barrier discharge plasma actuators driven by sinusoidal high-voltage power Open
Flow control using surface Dielectric Barrier Discharge (DBD) plasma actuators driven by a sinusoidal alternating-current power supply has gained significant attention from the aeronautic industry. The induced flow field of the plasma actu…
View article
Experimental characterization of the effects induced by passive plasma lens on high brightness electron bunches Open
We report on the experimental characterization of the effect that a passive plasma lens in the overdense regime has on high-brightness bunch quality by means of 6D phase-space analysis. The passive lens is generated by confining hydrogen g…
View article
Laser-heated capillary discharge plasma waveguides for electron acceleration to 8 GeV Open
A plasma channel created by the combination of a capillary discharge and inverse Bremsstrahlung laser heating enabled the generation of electron bunches with energy up to 7.8 GeV in a laser-driven plasma accelerator. The capillary discharg…
View article
Guiding of high-intensity laser pulses in 100mm-long hydrodynamic optical-field-ionized plasma channels Open
Hydrodynamic optically-field-ionized (HOFI) plasma channels up to 100mm long are investigated. Optical guiding is demonstrated of laser pulses with a peak input intensity of $6\\times10^{17}$ W cm$^{-2}$ through 100mm long plasma channels …
View article
Laser beam coupling with capillary discharge plasma for laser wakefield acceleration applications Open
One of the most robust methods, demonstrated to date, of accelerating electron beams by laser-plasma sources is the utilization of plasma channels generated by the capillary discharges. Although the spatial structure of the installation is…
View article
Effect of permittivity and frequency on induced velocity in ac-DBD surface and channel plasma actuators Open
Plasma actuators have attracted interest for use as active flow control devices due to their many benefits; they have no moving parts and are lightweight, can be flush mounted, and require low power. In this study, the performance of plasm…
View article
Laser-Driven Plasma Accelerators Operating in the Self-Guided, Blowout Regime Open
In this paper, some recent developments in the area of laser-driven plasma wakefield accelerators are reviewed. In particular, we discuss the acceleration of electrons by laser-induced plasma wakes in the so-called blowout regime. In this …
View article
Electron Trapping from Interactions between Laser-Driven Relativistic Plasma Waves Open
Interactions of large-amplitude relativistic plasma waves were investigated experimentally by propagating two synchronized ultraintense femtosecond laser pulses in plasma at oblique crossing angles to each other. The electrostatic and elec…
View article
Cumulative air density depletion during high repetition rate filamentation of femtosecond laser pulses: Application to electric discharge triggering Open
We study the influence of the laser repetition rate on the generation of low-density channels of air left in the path of femtosecond laser filament. At high repetition rates, we observe the formation of a permanent millimeter-wide low-dens…
View article
Study on the Discharge Characteristics of Single-Pulse Discharge in Micro-EDM Open
To further study the discharge characteristics and machining mechanism of micro-electrical discharge machining (micro-EDM), the variation trends of the discharge energy and discharge crater size with actual discharge duration are discussed…