Experimental measurements of gamma-photon production and estimation of electron/positron production on the PETAL laser facility  

作　　者：F.Brun L.Ribotte G.Boutoux X.Davoine P.E.Masson-Laborde Y.Sentoku N.Iwata N.Blanchot D.Batani I.Lantuéjoul L.Lecherbourg B.Rosse C.Rousseaux B.Vauzour D.Raffestin E.D’Humières X.Ribeyre 

机构地区：[1]Centre Lasers Intenses et Applications,UMR 5107,Universitéde Bordeaux-CNRS-CEA,33405 Talence,France [2]CEA,DAM,CESTA,F-33116 Le Barp,France [3]CEA,DAM,DIF,F-91297 Arpajon,France [4]CEA,LMCE,UniversitéParis-Saclay,91680 Bruyères-le-Châtel,France [5]Institute of Laser Engineering,Osaka University,2-6 Yamadaoka,Suita,Osaka 565-0871,Japan

出　　处：《Matter and Radiation at Extremes》2024年第5期32-47,共16页极端条件下的物质与辐射（英文）

基　　金：support by GENCI France through awarding us access to HPC resources at TGCC/CCRT(Grant Nos.A0110512943 and A0130512943);funded by the French Agence Nationale de la Recherche under Grant No.ANR-10-EQPX-42-01;funded by the LabEx LAPHIA of the University of Bordeaux under Grant No.ANR-10-IDEX-03-02.

摘　　要：This article reports the first measurements of high-energy photons produced with the high-intensity PETawatt Aquitaine Laser(PETAL)laser.The experiments were performed during the commissioning of the laser.The laser had an energy of about 400 J,an intensity of 8×10^(18)W cm^(−2),and a pulse duration of 660 fs(FWHM).It was shot at a 2 mm-thick solid tungsten target.The high-energy photons were produced mainly from the bremsstrahlung process for relativistic electrons accelerated inside a plasma generated on the front side of the target.This paper reports measurements of electrons,protons and photons.Hot electrons up to35 MeV with a few-MeV temperature were recorded by a spectrometer,called SESAME(SpectreÉlectronS Angulaire MoyenneÉnergie).K-and L-shells were clearly detected by a photon spectrometer called SPECTIX(Spectromètre PetalàCristal en TransmIssion pour le rayonnnement X).High-energy photons were diagnosed by CRACC-X(Cassette de RAdiographie Centre Chambre-rayonnement X),a bremsstrahlung cannon.Bremsstrahlung cannon analysis is strongly dependent on the hypothesis adopted for the spectral shape.Different shapes can exhibit similar reproductions of the experimental data.To eliminate dependence on the shape hypothesis and to facilitate analysis of the data,simulations of the interaction were performed.To model the mechanisms involved,a simulation chain including hydrodynamic,particle-in-cell,and Monte Carlo simulations was used.The simulations model the preplasma generated at the front of the target by the PETAL laser prepulse,the acceleration of electrons inside the plasma,the generation of MeV-range photons from these electrons,and the response of the detector impacted by the energetic photon beam.All this work enabled reproduction of the experimental data.The high-energy photons produced have a large emission angle and an exponential distribution shape.In addition to the analysis of the photon spectra,positron production was also investigated.Indeed,if high-energy photons are generated inside the s

关 键 词：process POSITRON HYPOTHESIS 

分 类 号：O57[理学—粒子物理与原子核物理]