简介：Thispaperproposesanewmethodtopredictthecoronaonsetvoltageforarodplaneairgap,basedonthesupportvectormachine(SVM).BecausetheSVMisnotlimitedbythesize,dimensionandnonlinearityofthesamples,thismethodcanrealizeaccuratepredictionwithfewtrainingdata.Onlyelectricfieldfeaturesarechosenastheinput;nogeometricparameterisincluded.Therefore,theexperimentdataofonekindofelectrodecanbeusedtopredictthecoronaonsetvoltagesofotherelectrodeswithdifferentsizes.Withtheexperimentaldataobtainedbyozonedetectiontechnology,andexperimentaldataprovidedbythereference,theefficiencyoftheproposedmethodisvalidated.Accuratepredictedresultswithanaveragerelativelessthan3%areobtainedwithonly6experimentaldata.

简介：InTokomak,thesupportoftheELMcoil,whichisclosetotheplasmaandsubjecttohighradiationlevel,hightemperatureandhighmagneticfield,isusedtotransportandbearthethermalloadduetothermalexpansionandthealternatingelectromagneticforcegeneratedbyhighmagneticfieldandACcurrentinthecoil.AccordingtothefeatureofITERELMcoil,themechanicalperformanceofrigidandflexiblesupportsunderdifferenthighnuclearheatlevelsisstudied.Resultsshowthatflexiblesupportshavemoreexcellentperformanceinhighnuclearheatconditionthanrigidsupports.Concerningthermalandelectromagnetic(EM)loads,optimizedresultsfurtherprovethatflexiblesupportshavebettermechanicalperformancethanrigidones.Throughthesestudies,reasonablesupportdesigncanbeprovidedfortheELMcoilsorsimilarcoilsinTokamakbasedonthenuclearheatlevel.

简介：ThesolutionofGrad-Shafranovequationdeterminesthestationarybehavioroffusionplasmainsideatokamak.Tosolvetheequationitisnecessarytoknowthetoroidalcurrentdensityprofile.Recentworksshowthatitispossibletodetermineamagnetohydrodynamic(MHD)equilibriumwithreversedcurrentdensity(RCD)profilesthatpresentsmagneticislands.InthisworkweshowanalyticalMHDequilibriumwithaRCDprofileandanalyzethestructureofthevacuumvectorpotentialassociatedwiththeseequilibriausingthevirtualcasingprinciple.

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