M. Burza

Lund University

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Guillaume Genoud

Université Paris Nanterre

F. Wojda

Lund University

P. McKenna

University of Strathclyde

B. Cros

Laboratoire de Physique des Gaz et des Plasmas

C.-G. Wahlström

Lund University

R. J. Gray

University of Strathclyde

D. C. Carroll

Rigel (United States)

C.-G. Wahlström

Lund University

K. Cassou

Laboratoire de Physique des 2 Infinis Irène Joliot-Curie

Xiaohui Yuan

Shanghai Jiao Tong University

Cooperative Institutions

Lund University

University of Strathclyde

Rutherford Appleton Laboratory

Centre National de la Recherche Scientifique

MAX IV Laboratory

Institute of Physics

Imperial College London

Chinese Academy of Sciences

Université Paris-Sud

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

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Laser-plasma electron acceleration in dielectric capillary tubes

Applied Physics B (2011)

Guillaume Genoud K. Cassou F. Wojda H. E. Ferrari Christos Kamperidis

Electron beams and betatron X-ray radiation generated by laser wakefield acceleration in long plasma targets are studied. The targets consist of hydrogen filled dielectric capillary tubes of diameter 150 to 200 microns and length 6 to 20 mm. Electron beams are observed for peak laser intensities as low as 5×1017 W/cm2. It is found that the capillary collects energy outside the main peak of the focal spot and contributes to keep the beam self-focused over a distance longer than in a gas jet of similar density. This enables the pulse to evolve enough to reach the threshold for wavebreaking, and thus trap and accelerate electrons. No electrons were observed for capillaries of large diameter (250 μm), confirming that the capillary influences the interaction and does not have the same behaviour as a gas cell. Finally, X-rays are used as a diagnostic of the interaction and, in particular, to estimate the position of the electrons trapping point inside the capillary.

Betatron

Plasma acceleration

10.1007/s00340-011-4639-4

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Citations (23)

Controlling the spectrum of x-rays generated in a laser-plasma accelerator by tailoring the laser wavefront

Applied Physics Letters (2009)

S. P. D. Mangles Guillaume Genoud S. Kneip M. Burza K. Cassou

By tailoring the wavefront of the laser pulse used in a laser-wakefield accelerator, we show that the properties of the x-rays produced due to the electron beam’s betatron oscillations in the plasma can be controlled. By creating a wavefront with coma, we find that the critical energy of the synchrotronlike x-ray spectrum can be significantly increased. The coma does not substantially change the energy of the electron beam, but does increase its divergence and produces an energy-dependent exit angle, indicating that changes in the x-ray spectrum are due to an increase in the electron beam's oscillation amplitude within the wakefield.

Betatron

Coma (optics)

Plasma acceleration

Oscillation (cell signaling)

10.1063/1.3258022

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Citations (64)

Stabilizing a high-pressure phase in InSb at ambient conditions with a laser-driven pressure pulse

arXiv (Cornell University) (2017)

Amélie Jarnac Xiaocui Wang Ann Bengtsson M. Burza J. Carl Ekström

In this letter, we describe the stabilization of indium antimonide (InSb) in the high-pressure orthorhombic phase (InSb-III) at ambient conditions. Until now, InSb-III has only been observed above 9 GPa, or at around 3 GPa as a metastable structure during the phase transition from cubic zinc blende (InSb-I) to orthorhombic InSb-IV. The crystalline phase transition from InSb-I to InSb-III was driven by an ultrashort, laser-generated, non-hydrostatic pressure pulse. The transition occurred in preferred orientations locked to the initial orientation of the InSb-I crystal, breaking the symmetry of the InSb-I cubic cell to form the InSb-III orthorhombic cell.

Indium antimonide

Orthorhombic crystal system

Metastability

Hydrostatic pressure

Crystal (programming language)

10.48550/arxiv.1712.05370

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Supersonic jets of hydrogen and helium for laser wakefield acceleration

Physical Review Accelerators and Beams (2016)

Krister Svensson M. Hansson F. Wojda L. Senje M. Burza

The properties of laser wakefield accelerated electrons in supersonic gas flows of hydrogen and helium are investigated. At identical backing pressure, we find that electron beams emerging from helium show large variations in their spectral and spatial distributions, whereas electron beams accelerated in hydrogen plasmas show a higher degree of reproducibility. In an experimental investigation of the relation between neutral gas density and backing pressure, it is found that the resulting number density for helium is $\ensuremath{\sim}30%$ higher than for hydrogen at the same backing pressure. The observed differences in electron beam properties between the two gases can thus be explained by differences in plasma electron density. This interpretation is verified by repeating the laser wakefield acceleration experiment using similar plasma electron densities for the two gases, which then yielded electron beams with similar properties.

Plasma acceleration

10.1103/physrevaccelbeams.19.051301

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Citations (3)

Injection and transport properties of fast electrons in ultraintense laser-solid interactions

Physics of Plasmas (2013)

M. Coury D. C. Carroll A. P. L. Robinson Xiaohui Yuan C. M. Brenner

Fast electron injection and transport in solid foils irradiated by sub-picosecond-duration laser pulses with peak intensity equal to 4×1020 W/cm2 is investigated experimentally and via 3D simulations. The simulations are performed using a hybrid-particle-in-cell (PIC) code for a range of fast electron beam injection conditions, with and without inclusion of self-generated resistive magnetic fields. The resulting fast electron beam transport properties are used in rear-surface plasma expansion calculations to compare with measurements of proton acceleration, as a function of target thickness. An injection half-angle of ∼50°−70° is inferred, which is significantly larger than that derived from previous experiments under similar conditions.

Picosecond

Particle-in-cell

Resistive touchscreen

10.1063/1.4799726

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Citations (15)

Tunable Mega-Ampere Electron Current Propagation in Solids by Dynamic Control of Lattice Melt

Physical Review Letters (2014)

D. A. MacLellan D. C. Carroll R. J. Gray N. Booth M. Burza

The influence of lattice-melt-induced resistivity gradients on the transport of mega-ampere currents of fast electrons in solids is investigated numerically and experimentally using laser-accelerated protons to induce isochoric heating. Tailoring the heating profile enables the resistive magnetic fields which strongly influence the current propagation to be manipulated. This tunable laser-driven process enables important fast electron beam properties, including the beam divergence, profile, and symmetry to be actively tailored, and without recourse to complex target manufacture.

Resistive touchscreen

Lattice (music)

Ampere

Electron beam welding

10.1103/physrevlett.113.185001

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Citations (9)

Active control of the pointing of a multi-terawatt laser

Review of Scientific Instruments (2011)

Guillaume Genoud F. Wojda M. Burza Anna Persson C.-G. Wahlström

The beam pointing of a multi-terawatt laser is stabilized on a millisecond time scale using an active control system. Two piezo mirrors, two position sensing detectors, and a computer based optimization program ensure that both near- and far-field are stable, even during single shot operation. A standard deviation for the distribution of laser shots of \documentclass[12pt]{minimal}\begin{document}$2.6\, \mu\, \text{rad}$\end{document}2.6μrad is achieved.

Millisecond

Position (finance)

Single shot

10.1063/1.3556438

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Citations (34)

Publisher's Note: “Active control of the pointing of a multi-terawatt laser” [Rev. Sci. Instrum. 82, 033102 (2011)]

Review of Scientific Instruments (2011)

Guillaume Genoud F. Wojda M. Burza A. Persson C.-G. Wahlström

First Page

10.1063/1.3660250

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Single-shot characterization of high-quality laser-plasma-accelerated electron bunches using transition-radiation-based techniques

Bulletin of the American Physical Society (2012)

C. A. J. Palmer Tobias Kleinwaechter L. Schaper Jens Osterhoff Nicolas Bourgeois

Single shot

Transition radiation

Characterization

Bunches

Source

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Laser wakefield acceleration using wire produced double density ramps

Physical Review Special Topics - Accelerators and Beams (2013)

M. Burza Arkady Gonoskov Krister Svensson F. Wojda Anton E. O. Persson

A novel approach to implement and control electron injection into the accelerating phase of a laser wakefield accelerator is presented. It utilizes a wire, which is introduced into the flow of a supersonic gas jet creating shock waves and three regions of differing plasma electron density. If tailored appropriately, the laser plasma interaction takes place in three stages: Laser self-compression, electron injection, and acceleration in the second plasma wave period. Compared to self-injection by wave breaking of a nonlinear plasma wave in a constant density plasma, this scheme increases beam charge by up to 1 order of magnitude in the quasimonoenergetic regime. Electron acceleration in the second plasma wave period reduces electron beam divergence by $\ensuremath{\approx}25%$, and the localized injection at the density downramps results in spectra with less than a few percent relative spread.

Plasma acceleration

10.1103/physrevstab.16.011301

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Citations (35)