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A methodforestimatingthetemperatureinhighenergydensityfreeelectron laser experiments

By Emiliano Principi, Carino Ferrante, Adriano Filipponi, Filippo Bencivengo, Francesco D'Amico, Claudio Masciovecchio and Andrea Di Cicco

Abstract

International audiencePresentandforthcomingfreeelectronlaser(FEL)largescalefacilitiesdeliverhighfluenceultrafastsoft and hardX-raypulsesabletocreateandprobewarmdensematter(WDM).Properdiagnosticforbasic physicalquantities,liketemperatureanddensity,isnecessary,buttheshortlifetimeoftheWDMstate (few ps)makestheirmeasurementsachallengingtask.Inthisworkweproposeamethodtoestimate the WDMtemperatureusingtheexperimentalinformationfromaslowtemperaturepyrometricprobe exploitingthepropertiesoftheheatdiffusionequation.Numericalsimulationsshowthatfortypical thin foilsamples,atemperaturemeasurementwith1210 ms temporalresolutionatthedistanceof about3002500 mm fromthebeamcentercontainssufficientinformationtoretrievetheinitialspatial temperaturedistributionwithsufficientaccuracyprovidinginformationonthetemperaturereachedin the WDMregime.TheinversionoftheexperimentalinformationisobtainedbymeansofaBayesian approachexploitingaMetropolisMonteCarlonumericalprocedure.Themodelandcalculations presentedinthisworkprovidethetheoreticalbackgroundforthedevelopmentofadevicefor temperaturediagnosticsoftheTIMEXend-stationattheFermi@ElettraFELfacility

Topics: Temperature measurements, Pyrometer, Femto-second experiments, Warm densematter, Heat equation, [ PHYS.COND.CM-GEN ] Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other]
Publisher: Elsevier
Year: 2010
OAI identifier: oai:HAL:hal-00560126v1
Provided by: Hal-Diderot
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