{"id":18037,"date":"2020-06-25T18:40:27","date_gmt":"2020-06-25T18:40:27","guid":{"rendered":"https:\/\/dev.inrs.ca\/imaging-magnetic-instabilities-using-laser-accelerated-protons\/"},"modified":"2021-05-21T12:39:02","modified_gmt":"2021-05-21T16:39:02","slug":"visualiser-des-instabilites-magnetiques-avec-des-protons-acceleres-par-laser","status":"publish","type":"post","link":"https:\/\/dev.inrs.ca\/en\/news\/imaging-magnetic-instabilities-using-laser-accelerated-protons\/","title":{"rendered":"Imaging magnetic instabilities using laser accelerated protons"},"content":{"rendered":"\n

The magnetic structures resulting from a plasma instability predicted by the physicist Erich Weibel about 50 years ago has been evidenced at surprisingly large scales in a laser-driven plasma in the prestigious journal Nature Physics<\/em>. <\/strong><\/strong><\/p>\n\n\n\n

\"Visualiser
Ion radiography of Weibel instability (credit : David Tordeux)<\/figcaption><\/figure><\/div>\n\n\n\n
<\/div>\n\n\n\n

This instability is also expected to operate in astrophysical settings where it is held responsible for the acceleration of cosmic rays and the emission of gamma photons in the famous \u201cgamma-ray bursts\u201d. <\/p>\n\n\n\n

Julien Fuchs, a graduate of the Institut national de la recherche scientifique (INRS) and a researcher at the Laboratoire pour l\u2019utilisation des lasers intenses<\/a> (LULI) in France, INRS Professor Patrizio Antici<\/a>, a specialist in laser-driven particle acceleration, and INRS Professor Emeritus Henri P\u00e9pin have succeeded in measuring the magnetic fields produced by Weibel instabilities within a laser-driven plasma, an ionized gas. Their results were published on June 1<\/a> in the prestigious journal Nature Physics<\/em>.<\/p>\n\n\n\n

The researchers used the proton radiography technique to visualize this extremely fast phenomenon. \u201cOur protons accelerated by laser-plasma interaction are able to take a sequence of images of very fast electromagnetic phenomena, lasting a few picoseconds only and with a resolution of a few microns. This allows us to probe instabilities with precision unmatched by other imaging techniques\u201d reports Patrizio Antici, who did his thesis under the supervision of Professor Fuchs, himself formerly under the direction of Professor P\u00e9pin. <\/p>\n\n\n\n

These three generations of researchers recreated a \u201csmall-scale model\u201d of astrophysical phenomena in the laboratory by irradiating a target with an intense laser. The magnetic fluctuations generated by the interaction can be probed by protons on a series of sensitive films, producing a sequence of images showing the temporal evolution of the magnetic structures.<\/p>\n\n\n\n

The interpretation and modeling of these structures were conducted by Laurent Gremillet and Charles Ruyer, physicists at the Commissariat \u00e0 l\u2019\u00e9nergie atomique et aux \u00e9nergies alternatives (CEA). After several years of hard work, combining theoretical modelling and advanced numerical simulations, they highlighted the growth of two variants of the Weibel instability according to the region of the plasma where they develop.<\/p>\n\n\n\n

L\u2019interpr\u00e9tation et la mod\u00e9lisation de ces structures ont \u00e9t\u00e9 r\u00e9alis\u00e9es en collaboration avec les physiciens du Commissariat \u00e0 l\u2019\u00e9nergie atomique et aux \u00e9nergies alternatives (CEA), Laurent Gremillet et Charles Ruyer. Apr\u00e8s plusieurs ann\u00e9es de travail combinant mod\u00e9lisation th\u00e9orique et simulations num\u00e9riques de pointe, les chercheurs ont mis au jour deux variantes de l\u2019instabilit\u00e9 de Weibel selon la r\u00e9gion du plasma o\u00f9 elles se d\u00e9veloppent.<\/p>\n\n\n\n

With more powerful lasers, researchers will be able to reproduce and analyze even more extreme astrophysical phenomena with unrivalled resolution.  <\/p>\n\n\n\n

About the study<\/strong><\/h3>\n\n\n\n

\u201cGrowth of concomitant laser-driven collisionless and resistive electron filamentation instabilities over large spatiotemporal scales\u201d by C. Ruyer, S. Bola\u00f1os, B. Albertazzi, S. N. Chen, P. Antici, J. B\u00f6ker, V. Dervieux, L. Lancia, M. Nakatsutsumi, L. Romagnani, R. Shepherd, M. Swantusch, M. Borghesi, O. Willi, H. P\u00e9pin, M. Starodubtsev, M. Grech, C. Riconda, L. Gremillet & J. Fuchs was published in Nature Physics<\/em>. They have received financial support from the Horizon 2020 research and innovation programme of the European Union and the European Research Council (ERC). DOI: https:\/\/doi.org\/10.1038\/s41567-020-0913-x<\/a><\/p>\n\n\n

\n

Other articles you might be interested in<\/h4>\n
\n
\n
\n \"Infinitely\n <\/div>\n
\n Infinitely small, infinitely fast<\/a>\n <\/div>\n <\/div>\n <\/div>\n<\/div>\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

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