thermo-mechanical and atomistic assessment of first wall ...€¦ · g. gonzalez-rubio, o....

Thermo-mechanical and Atomistic Assessment of First Wall, and Optics in

non-protective chamber in Inertial Fusion Energy

J M Perlado, A Rivera, R González-Arrabal, O. Peña, D Garoz*, M. Panizo

Ins$tutodeFusiónNuclear,ETSII,UniversidadPolitécnicadeMadrid,Spain.

*also,MechanicsofMaterialandStructures,[email protected]

24/10/18 IAEAFEC2018,Ahmedabad(India),J.M.Perladoetal.,InsEtutoFusiónNuclear/UPM,IFE/1-4


SUMMARY

THERMOMECHANICALEFFECTSFORDIFFERENTIFEREACTORASSUMPTIONS:DEFININGFWTHICKNESS

GRAINBOUNDARIESEFFECTSINHBEHAVIOUR:COMPUTATIONANDEXPERIMENTS

EFFECTSOFPLASMONICNANOPARTICLESINOPTICSBEHAVIOUR


WorkingparametersforHiPERdifferentschemesofimplementa9on


DeposiEonofEnergyinFWfromTargetinDirectDriveDEMOHiPER

10%ofEnergyisdepositedwithindepthsupto100μmbythemostenergeEcions(>1MeV).

moredetailsinGarozetal,NuclearFusion


Reactor“start-up”Emes:

lowerthan~6sforPrototype(1Hz,50MJ)

and

~60sforDemo(10Hz,154MJ)

TwosituaEons:

“startup”

and

Steadystate

Steadystate Start-up

ODS-RAFM(925K)


TemperatureevoluEonduringapulseoncethesteadystateregimeisreachedforHiPER

bothinProtoandDemoresults.3400K

Justajer1shot


pulse=duringpulse

base=whenthematerialrecoverthebasetemperature

PulseheaEng


MonocrystalineinsimulaEonsNOGB.


GBsdramaEcallyaffect thevacancyconcentraEon,beingmuchhigher forsampleswithalargeGBdensitythanforthosewithoutGBs.Thekeyreasonisthatmostofthevacanciesannihilate with SIAs in absence of GBs, whereas in NW, at this temperature in whichvacanciesareimmobile,alargerfracEonofvacanciessurvivesajertheirradiaEonduetotheefficientroleofGBsassinksforSIAs.


DifferencesbecauseofprocedureinMWnoGBatall

NoGB=DiffusionH,at400nmvacancies


(a)DifferencesareobservedwhencomparingresultsfortheCGWtothosefortheMWsamples.ThereasonisthatthesimulaEons(MW)donotconsiderGBsatall,whereassomeGBsexistintheCGWsample.

(b)ForNW-H,resultsclearlyindicatesHdiffusionalongthedepthdirecEon.

(c)FortheMW-Co-CH,themainHretenEonpeaklocatesat~400nm.ThisresultindicatesthatintheabsenceofGBs,HatomsdiffusealongtheirradiaEondirecEon,andintheirmigraEontothesurface,Hatomsreacharegionhighlypopulatedbyvacanciesat~400nm,wheretheygettrapped,explainingthedifferencesintheHprofilebetween150and540nm.

(d)ForNW-Co-CH,thereisgoodagreementbetweenmeasuredandsimulatedHprofile.InaddiEon,thetotalHretenEonisalmostthesameinthesimulaEonsasintheexperimentsanddiffusionisobserved.


(f)ThemeasuredandsimulatedHprofilesagreequitewellfortheNW-Seq-CH.BothprofilesshowHretenEonpeakat~650nm.Moreover,thetotalmeasuredandsimulatedretainedfracEonsarequitesimilar.

WhenSequenEalC-H,weobservethattheenhancementfortheNWislowerthanthatfortheMWsamples.ThissupportstheideaoftheGBsacEngasdiffusionpathsforH.ThepresenceofahigherGBdensityinNWleadstoahigherprobabilityofHreleasealongGBs,beinglessaffectedbythepresenceofthehighervacancyconcentraEonsinducedbyCirradiaEon.

WhencomparingthedatafortheMW-Co-CHandfortheMW-Seq-CH,weobserveaclearinfluenceoftheirradiaEonprocedureitselfontheHretenEon,eventhoughtheconcentraEonofvacanciesissimilarinbothcases.


Hatomsaremainlytrappedinvacancieslocatedintheinteriorofthegrains.ThenextquesEonistoesEmatethetypeandsizeofclusterswhereHatomsaretrapped.Studyisongoingexperimentally(M.Panizoetal.,tobepublished)

AccordingtooursimulaEons,sincevacanciesareimmobileatRT,morethan90%ofHatomsareretainedinmonovacancieswithdifferentHcontent.Moreover,DFTdatashowthatthatthemaximumnumberofHatomsthatcanbeaccommodatedinsidethemonovacancyis10.Fromthesedatawecanconcludethatself-healinginWwouldhappenattemperaturesinwhichthemobilityofvacanciesisacEvated.

Thisremark,togetherwiththefactthatGBsfavorsHrelease,indicatethatnanostructuredWmaybeacandidateforPFMapplicaEons,asithasahigherradiaEonresistancethanthetradiEonallyCGW


TheirradiaEonofgoldnanorodcolloidswithafemtosecondlasercanbetunedtoinducecontrollednanorodreshaping,yieldingcolloidswithexcepEonallynarrowlocalizedsurfaceplasmonresonancebands.HighlyconcentratedsilvercolloidalnanoparEclesoluEonswereproducedthankstofslaserablaEonanditwasdemonstratedthatsuchembeddedplasmonicnanoparEclesmaybeviablecandidatestoreducedamagesproducedonopEcsbyswijheavyionsduetothechangeoftheirshapeunderirradiaEon

G.Gonzalez-Rubio,O.Peña-Rodriguezetal.,Femtosecondlaserreshapingyieldsgoldnanorodswithultranarrowsurfaceplasmonresonantes,Science358,640,2017

PlasmonicNanoparEclesandOpEcs

O.Peña-Rodríguez,etal.,Understandingtheion-inducedelongaEonofsilvernanoparEclesembeddedinsilica,NatureScienEficReports,7:922,2017


ACKNOWLEDGEMENT

WorkunderNa,onalResearchRADIAFUSENE-2012-39787-CO6,

MadridGovernmentTECHNOFUSION(II)-CM,S2013/MAE-2745,and

EurofusionToIFEProjectAWP15-ENR-01/CEA-02

thermo-mechanical and atomistic assessment of first wall ...€¦ · g. gonzalez-rubio, o....

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