报告内容简介:ThisstudyinvestigatespossibleconnectionsbetweentheobserveddaysideequatorwardwindintheupperthermospherebytheHIWINDballoonexperimentandmagnetosphericlobe-cellconvectioninthepolarcapusingnumericalsimulationsfromthefirst-principles,physics-basedcoupledmagnetosphere-ionosphere-thermosphere(CMIT)model.ObservationshaveshownthattheselobecellsoccurfrequentlyinthesummerhemisphereduringIMFBydominantperiods.Theoreticalstudieshaveshownthatthelobe-cellphenomenonisamagnetosphericresponsetomergingsiteasymmetriesimpostedbydipoletilt,IMFBxandBy.Whenthehigh-latitudeforcingisfromaglobalmagnetospheremodeldrivenbyrealisticupstreamconditions,thethermosphere-ionosphereelectrodynamicgeneralcirculationmodel(TIEGCM)iscapableofreproducingtheobservedequatorwardneutralwindintheupperthermosphere.Whenthehigh-latitudeforcingisempiricalmodels,theTIEGCMpredictionsofmeridionalneutralwindsdeviatesignificantlyfromobservations.Data-modelcomparisonssuggestthatmagnetosphericlobe-cellconvectionmayhavesignificantinfluenceonthermosphericwindsinthepolarcapduringgeomagneticquiettimethroughion-neutralcoupling.

WeconsiderasimplesolutiontoexplaintherecentdibosonexcessobservedbyATALSandCMSCollaborationsinmodelswithcustodialsymmetrySU(2)L×SU(2)R→SU(2)c.TheSU(2)Ltripletvectorbosonρwithmassrangeof1.8∼2TeVwouldbeproducedthroughtheDrell-Yanprocesswithsizabledibosondecaybranchingtoaccountfortheexcess.TheotherSU(2)L×SU(2)RbidoubletaxialvectorbosonawouldcancelalldeviationsofelectroweakobervablesinducedbyρeveniftheSMfermionsmixwithsomeheavyvectorlike(composite)fermionswhichcoupletoρ(“non-universallypartiallycomposite”),thereforeallowsarbitrarycouplingsbetweeneachSMfermionandρ.Wepresentourmodelinthe“GeneralCompositeHiggs”frameworkwithSO(5)×U(1)X→SO(4)×U(1)XbreakingatscalefanddemandthefirstWeinbergsumruleandpositivegaugebosonformfactorsasthetheoreticalconstraints.Wefindthatourmodelcanfitthedibosonexcessverywelliftheleft-handedSMlightquarks,chargedleptonsandtopshavezero,zero/moderatelysmallandmoderate/largecompositecomponentsforreasonablevaluesofgρandf.ThecorrelationbetweentreelevelSparameterandtheh→Zγsuggestalargeacontributiontoh→ZγanditisindeedaO(1)effectinourparameterspacewhichprovidesastronghintforourscenarioifthisdibosonexcessisconfirmedbythe13∼14TeVLHCRunII.

ShortdescriptionoftheRFP&Mainideasofthecourse;Simplemagneticconfinementreactorfromfirstprinciples;Historyupto1996theZ-pinchlegacy;AssetsandchallengesofaRFPreactor;ChangeofparadigmfortheRFPsince1997;Particletrajectoriesandneoclassicaleffects;DiscussionofrelaxationtheoriesLawsoncriterion;OtheraspectsofRFPphysics;Methodologicalaspectsofmagneticfusionresearch.