Characterization of bright betatron radiation generated by direct laser acceleration of electrons in plasma of near critical densityOA北大核心
Characterization of bright betatron radiation generated by direct laser acceleration of electrons in plasma of near critical density
Directed x-rays produced in the interaction of sub-picosecond laser pulses of moderate relativistic intensity with plasma of near-critical den-sity are investigated.Synchrotron-like(betatron)radiation occurs in the process of direct laser acceleration(DLA)of electrons in a relativistic laser channel when the electrons undergo transverse betatron oscillations in self-generated quasi-static electric and magnetic fields.In an experiment at the PHELIX laser system,high-current directed beams of DLA electrons with a mean energy ten times higher than the pon-deromotive potential and maximum energy up to 100 MeV were measured at 1019 W/cm2 laser intensity.The spectrum of directed x-rays in the range of 5-60 keV was evaluated using two sets of Ross filters placed at 0° and 10° to the laser pulse propagation axis.The differen-tial x-ray absorption method allowed for absolute measurements of the angular-dependent photon fluence.We report 1013 photons/sr with energies＞5 keV measured at 0° to the laser axis and a brilliance of 1021 photons s-1 mm-2 mrad-2(0.1％BW)-1.The angular distribution of the emission has an FWHM of 14°-16°.Thanks to the ultra-high photon fluence,point-like radiation source,and ultra-short emission time,DLA-based keV backlighters are promising for various applications in high-energy-density research with kilojoule petawatt-class laser facilities.
J.Cikhardt;A.Pukhov;N.E.Andreev;O.N.Rosmej;M.Gyrdymov;S.Zähter;P.Tavana;M.M.Günther;N.Bukharskii;N.Borisenko;J.Jacoby;X.F.Shen
Faculty of Electrical Engineering,Czech Technical University in Prague,16627 Prague 6,Czech RepublicHeinrich-Heine-University Düsseldorf,Universitätsstrasse 1,Düsseldorf,GermanyJoint Institute for High Temperatures,RAS,lzhorskaya st.13,Bldg.2,125412 Moscow,Russian Federation||Moscow Institute of Physics and Technology,Institutskiy Pereulok 9,141700 Dolgoprudny,RussiaGoethe University,Frankfurt,Max-von-Laue-Straße 1,60438 Frankfurt am Main,Germany||GSI Helmholtzzentrum für Schwerionenforschung GmbH,Planckstraße 1,64291 Darmstadt,GermanyGoethe University,Frankfurt,Max-von-Laue-Straße 1,60438 Frankfurt am Main,GermanyGSI Helmholtzzentrum für Schwerionenforschung GmbH,Planckstraße 1,64291 Darmstadt,Germany||Focused Energy GmbH,Im Tiefen See 45,64293 Darmstadt,GermanyGSI Helmholtzzentrum für Schwerionenforschung GmbH,Planckstraße 1,64291 Darmstadt,GermanyNational Research Nuclear University MEPhl,Kashirskoe shosse 31,115409 Moscow,Russian Federation||Lebedev Physical Institute RAS,Leninskiy Prospekt 53,119991 Moscow,Russian FederationLebedev Physical Institute RAS,Leninskiy Prospekt 53,119991 Moscow,Russian Federation
《极端条件下的物质与辐射（英文）》 2024 (002)
26-35 / 10
The authors are very grateful for the support provided by the PHELIX laser team.This research has been also supported by the Czech Ministry of Education,Youth and Sports(Project No.CZ.02.2.69/0.0/0.0/18_053/0016980)and the Grant Agency of the Czech Republic(Grant No.GM23-05027M).
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