Irradiation uniformity at the Laser MegaJoule facility in the context of the shock ignition scheme-中国期刊网

摘要 TheuseoftheLaserMegaJoulefacilitywithintheshockignitionschemehasbeenconsidered.Inthefirstpartofthestudy,one-dimensionalhydrodynamiccalculationswereperformedforaninertialconfinementfusioncapsuleinthecontextoftheshockignitionschemeprovidingtheenergygainandanestimationoftheincreaseofthepeakpowerduetothereductionofthephotonpenetrationexpectedduringthehigh-intensityspikepulse.Inthesecondpart,weconsideredaLaserMegaJouleconfigurationconsistingof176laserbeamsthathavebeengroupedprovidingtwodifferentirradiationschemes.Inthisconfigurationthemaximumavailableenergyandpowerare1.3MJand440TW.Optimizationofthelaser–capsuleparametersthatminimizetheirradiationnon-uniformityduringthefirstfewnsofthefootpulsehasbeenperformed.ThecalculationstakeintoaccountthespecificellipticallaserintensityprofileprovidedattheLaserMegaJouleandtheexpectedbeamuncertainties.Asignificantimprovementoftheilluminationuniformityprovidedbythepolardirectdrivetechniquehasbeendemonstrated.Three-dimensionalhydrodynamiccalculationshavebeenperformedinordertoanalysethemagnitudeoftheazimuthalcomponentoftheirradiationthatisneglectedintwodimensionalhydrodynamicsimulations.

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Irradiation uniformity at the Laser MegaJoule facility in the context of the shock ignition scheme

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Irradiation uniformity at the Laser MegaJoule facility in the context of the shock ignition scheme

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