简介：Inourpreviouswork,aplasmaapproachforsingleattosecondpulse(AP)generationwasproposed.Afew-cyclerelativisticcircularlypolarizedlaserpulsewillinduceasingledrasticoscillationofplasmaboundary,fromwhichhigh-orderharmonicsandfurthermoreanultra-intensesingleAPcanbegeneratednaturallyafteritisreflected.Analyticalmodelandsimulationsbothdemonstratethattheprocessismostlyefficientasthepulsedurationisclosetotheplasmarespondingtime.Theeffectsofplasmadensityrampareanalyzedhere,suggestingthattheproposalisstillquiteefficientwithappropriatedensitygradientintheramp.Atlast,acombinedapproachisemployedtoobtainsingleAPwith30fsincidentlaser.Therelativelylarge-durationpulseisfirstlyshortenedbyadensitydroppingthinfoil,andthenreflectedfromanoverdenseplasmatarget.One-dimensionalsimulationshowsthata600assinglelightpulseisgeneratedwithpeakintensityof3×1020W/cm2.

简介：Uniformdiamondfilmsarehighlydesirableforcuttingindustries,duetotheirhighperformanceandlonglifetimeusedoncuttingtools.Nevertheless,theyaredifficulttoobtainoncuttingtoolswithcomplicatedshapes,greatlylimitingtheapplicationsofdiamondfilms.Inthisstudy,anovelapproachofdepositionforuniformdiamondfilmsisproposed,oncircularsawbladesmadeofcementedcarbideusingreflectorsofbrasssheets.Diamondfilmsaredepositedusinghotfilamentchemicalvapordeposition(HFCVD).Anovelconcavestructureofbrasssheetsisdesignedandfabricated,improvingthedistributionoftemperaturefield,andovercomingthedisadvantagesoftheconventionalHFCVDsystems.ThisincreasestheenergyefficiencyofusewithoutchangingthestructureandincreasingthecostofHFCVD.Thegrainsarerefinedandtheintensitiesofdiamondpeaksarestrengthenedobviously,whichisconfirmedbyscanningelectronmicroscopyandRamanspectrarespectively.

简介：Oneofthemostfascinatingignitionschemesfortheinertialfusionenergythatmightbefeasibleisfastignition.Itstargetsareignitedontheoutsidesurfacesothereisnoneedtolowdensityandhightemperaturecenterisrequiredbycentralhotspotignition.Fastignitionconceptisnoteworthyforasimplebutfundamentalreason:Inprincipleitrequireslesstotalenergyinputtoachieveignition.Inthispaper,fuelenergyandfuelenergygainofnearlypuredeuteriumcapsulearecalculated.Thiscapsuleisignitedbyadeuterium-tritiumseed,whichwouldreducethetritiuminventorytoafewpercentages.Thevariationsoffuelenergygainversusfueldensityhavebeenstudiedandsubmitted.Onthebasisofdifferentphysicalparametersthefollowingresultsoftheinvestigationarepresentedanddiscussed.Theenergygaincurvesfordifferenttritiumconcentrationsarefoundandlimitinggaincurvesarederived.Finally,tritium-poorfastignitoriscomparedtoequimolardeuterium-tritiumfastignitor.

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简介：Thegeometryofaninductivelycoupledplasma(ICP)etcherisusuallyconsideredtobeanimportantfactorfordeterminingbothplasmaandprocessuniformityoveralargewafer.Duringthepastfewdecades,theseparametersweredeterminedbythe'trialanderror'method,resultinginwastesoftimeandfunds.Inthispaper,anewapproachofregressionorthogonaldesignwithplasmasimulationexperimentsisproposedtoinvestigatethesensitivityofthestructuralparametersontheuniformityofplasmacharacteristics.ThetoolforsimulatingplasmaisCFD-ACE+,whichiscommercialmulti-physicalmodelingsoftwarethathasbeenproventobeaccurateforplasmasimulation.Thesimulatedexperimentalresultsareanalyzedtogetaregressionequationonthreestructuralparameters.Throughthisequation,engineerscancomputetheuni-formityoftheelectronnumberdensityrapidlywithoutmodelingbyCFD-ACE+.Anoptimizationperformedattheendproducesgoodresults.

简介：Thecomplexnatureoflaser-materialinteractioncausesnon-stoichiometricablationofalloysamples.Thisisattributedtomatrixeffect,whichreducesanalyzingcapability.Toaddressthisissue,theanalyticalperformanceofthreedifferentnormalizationmethods,namelynormalizationwithbackground,internalnormalizationandthreepointsmoothingtechniquesatdifferentparametersettingsisstudiedforquantificationofAgandZnbyLaserinducedbreakdownspectroscopy(LIBS).TheLIBSspectraoffiveknownconcentrationofsilverzincbinarycompositeshavebeeninvestigatedatvariouslaserirradiances(LIs).CalibrationcurvesforbothAg(I)line(4d^105s^2S1/2→4d^105p^2P1/2at338.28nm)andZn(I)line(4s5s^3S1→4s4p^3P2at481.053nm)havebeendeterminedatLIof5.86×10^10Wcm^-2.SlopesofthesecalibrationcurvesprovidethevaluationofmatrixeffectintheAg–Zncomposites.Withcarefulsamplepreparationandnormalizationaftersmoothingatoptimumparametersetting(OPS),theminimizationofsamplematrixeffecthasbeensuccessfullyachieved.AgoodlinearityhasbeenobtainedinAgandZncalibrationcurveatOPSwhennormalizedthewholeareaofspectrumaftersmoothingandtheobtainedcoefficientsofdeterminationvalueswereR^2=0.995and0.998closerto1.Theresultsofmatrixeffecthavebeenfurtherverifiedbyanalysisofplasmaparameters.BothplasmaparametersshowednochangewithvaryingconcentrationatOPS.However,athighconcentrationofAg,theobservedsignificantchangesinbothplasmaparametersatcommonparametersettingPS-1andPS-2werethegestureofmatrixeffect.Inourcase,thebetteranalyticalresultswereobtainedatsmoothingfunctionwithoptimizedparametersettingthatindicatesitismoreefficientthannormalizationwithbackgroundandinternalnormalizationmethod.