📰 Controlled acceleration of electrons in an all-optical plasma waveguide

In the race for very high-energy electron beams for particle physics, laser-plasma accelerators appear to be a promising compact solution. Physicists have increased that significantlyenergy (In a general sense, energy means anything that enables you to do work, gain energy, etc.) Electrons and improved the quality of the beams by controlling theinjection (The word injection can have several meanings:) Electrons in a GuideWave (A wave is the propagation of a disturbance that produces a variation in its path…) plasma (In physics, plasma describes a state of matter made up of charged particles…) all (The whole understood as the whole of existing is often interpreted as the world or…) optical (Optics is the branch of physics dealing with light, radiation…).


Legend: a) Example of 10 angle-resolved electron spectra obtained during a series of 14 exposures. b) Two examples of angle-integrated spectra corresponding to the spectra marked with blue and green lines in (a). Photo credit: Cedric Thaury.

Laser plasma accelerators generate extremely strong electric fields: 1000 times stronger than those generated by conventional accelerators. They use very powerful pulsed femtosecond lasers that generate a plasma (electrons, ions) through ionization matter (Matter is the substance that makes up every body with a tangible reality. It is…) and which create the fields that accelerate the electrons. In order to obtain a high-quality and high-energy electron beam, two conditions must be met: the impulse guidance laser (A laser is a device that emits light (electromagnetic radiation)…) to accelerate the electrons over the greatest possible distance, and the control (The word control can have several meanings. It can be used as a synonym for investigation, of….) Injection, i.e. the place where the electron beam is created, in order to have a beam that is as monokinetic as possible. While these conditions have been achieved separately for more than 15 years, they had never been achieved simultaneously before. By putting Point (Graphic) an all-optical guidance method for low densities of gas (A gas is a group of atoms or molecules that are very weakly bound and…) adapted to theLaser plasma acceleration (The laser-plasma acceleration is a research topic aimed at…) and by associating with an injection of electrons through shock (Once two entities violently interact, we say that there is a shock whether there…)Researchers at the Applied Optics Laboratory (LOA, CNRS (The National Center for Scientific Research, better known by its acronym CNRS, is the largest…) / Ecole polytechnique / ENSTA) met the two conditions and produced 1.1 GeV electron beams with unprecedented efficiency. This result removes a major barrier that should significantly increase the performance of laser plasma accelerators. These results are published in the journal Light Science and Applications.

In order to achieve these results, the scientists produced a purely optical plasma waveguide, ie they used a low-energy laser pre-pulse and focused it into a gas jet using a new kind of “optics”. occurred (In geometry, the evolute of a plane curve is the locus of its centers from…) for the experience. This pre-pulse creates a plasma channel whose density (The density or specific gravity of a body is the ratio of its density to…) decreases towards the optical axis: The main pulse is then guided as in a glass fiber (An optical fiber is a very thin glass or plastic thread that has the property…) with index gradient. This guidance increases the distance over which the intense laser accelerates the electrons, and the final energy is thus multiplied by 3. To get a ray whose scattering (Dispersion, in wave mechanics, is the phenomenon that affects a wave in a ….) is low in energy, it is necessary that the electrons accelerated by the laser pulse come from a well-defined region of the gas. To ensure this control of electron injection, the electron density of the plasma was shaped by creating a shock in the gas that locally created a strong density gradient that specified the range of electrons to be accelerated. This achieves a good energy resolution (figure). The next step is to improve the alignment of the laser in the gas, the precision of which influences the intensity of the electron beam.

A huge advantage of all-optical guidance, the first of which is demonstration (In mathematics, a demonstration enables a statement to be made from…) was performed here for theacceleration (Acceleration generally refers to an increase in speed; in physics,…) Plasma, is said to greatly limit the damage associated with it Powerful (The word power is used in several areas with a specific meaning:) of the laser and thus enables arbitrarily high energies and repetition rates. This approach opens up promising perspectives for the community. A country (The landscape, also called rural environment, refers to all cultivated areas…) of experiences in the infrastructure of research (Scientific research primarily refers to all measures taken to …) (IR) Apollo (Apollo (ancient Greek ?π?λλων / Apóllôn, Latin Apollo) is the god…)whose laser is ten times more powerful, will aim to triple the energy of the electron beam obtained. A particularly interesting perspective is to use Apollon for very basic studies, e.g. B. in connection with thequantum electrodynamics (The relativistic quantum electrodynamics is a physical theory that aims to…).

Relation:
Controlled acceleration of GeV electron beams in an all-optical plasma waveguide.
Kosta Oubrerie, Adrien Leblanc, Olena Kononenko, Ronan Lahaye, Igor A. Andriyash, Julien Gautier, Jean-Philippe Goddet, Lorenzo Martelli, Amar Tafzi, Kim Ta Phuoc, Slava Smartsev & Cédric Thaury, Light: Science & Applicationspublished on June 14, 2022.
DOI: 10.1038/s41377-022-00862-0.
HAL and arXiv open archives.

Contact:
– Cédric Thaury – CNRS Researcher, Laboratory of Applied Optics – cedric.thaury at ensta.fr
communication (Communication affects both humans (intrapsychic, interpersonal communication, etc.) INP – inp.com and cnrs.fr

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