简介：WeconsiderdiffusivelimitoftheBoltzmannequationinaperiodicbox.WeestablishL~6estimateforthehydrodynamicpartPfofparticledistributionfunction,whichleadstouniformboundsglobalintime.

简介：在未采取预电离措施的情况下，研究了纯sf6气体及sf6/h29sf6/c2h6两种混合气体激光介质脉冲放电特性。实验结果表明，无预电离时SF68其混合气体介质可以实现自引发体放电，气体介质体放电维持电压主要由SF,;含量决定，C2H6具有抑制电弧的作用，可以有效延长体放电维持时间。分析认为，sf66体高折合场强E/P导致的放电通道电流密度受限和高电负度■引起的放电通道中负离子分解产生二次电子，是介质实现自引发体放电的重要机理。

简介：In2016,thepowersupplyinCSRmwasdigitalizedtofurtherimprovethereliabilityofoperation.Anewvectorrecticationtechniqueisdevelopedfortheresearchofadvancedpowersupplyandelectricalrelatedtechnologies.AnumberofEMCandelectricalsafetytestingitemsforHIMMWuweipowersupplieshasbeencompleted.DigitalizationupgradeofthepowersupplyCSRmpowersupply,including30setsquadrupolemagnetpowersupply,6setssextupolemagnetpowersupplyand8setsbipolarcorrectmagnetpowersupply,weretransformedbyusingofdigitalcontrollersbasedonFPGA.Fig.1displaysthemeasurementresultsofthenewdigitalpowersupplyofquadrupolemagnet,thecurrenterror(attop)was1.7610?5,thetrackinger-rorwas5.2810?5.Theperformanceandreliabilityofthepowersupplyhavebeengreatlyimproved.

简介：SpokecavitieshavebeendevelopedandhaveapparentadvantagesforhighcurrentprotonacceleratorbasedonFig.1(coloronline)Theelectromagneticfielddistribution.superconductivityatlowandmediumenergyregion.Astheresearchandthetechnicalreserve,InstituteofModernPhysics(IMP)hasstartedtheR&Dprogramofadoublespokecavity(operatingfrequency325MHz,0=0.52),withintheframeworkofChinaAcceleratorDrivenSystem(C-ADS)project.TheRFdesignandmechanicalstructuredesignhavebeenfinished,andtwoprototypecavitiesweremanufacturedinHarbin.

简介：Withabout20permanentstaffandseveralgraduatestudents,IonSourceGroupisdoingpioneeringworkinhighperformanceECRandLaserionsourcedevelopment,ionsourceplasmastudy,ionsourceapplicationandroutineoperationfornationallaboratory.In2016,withthegreatcontributionsoftheteammembers,manyverypromisingresultsandachievementshavebeenmade.FortheroutineoperationofHIRFLfacility,threeionsources,i.e.

简介：TheprecursoryprojectofADSprotonlinearacceleratoristhedevicetoprovideintenseprotonbeamsfortheentiretransmutationsystem,whichhasthefiguresofintensebeamandhighenergy.Asaresult,acontinuousdeflectedbeamwithacertainintensitywoulddeclinetheperformanceoftheacceleratordevicesorevenmakedamageswithin20s.Inordertopreventthiskindofproblem,anintegratemachineprotectionsystemwithfunctionsofstatemonitoringandtimelybeamcuttingisrequiredtoprotectacceleratordevices.

简介：Ithasbeensuggestedthathydrogen-richsystemsathighpressuremayexhibitnotablyhighsuper-conductingtransitiontemperatures.Oneofthemoreinterestingtheoreticalpredictionswasthathydrogensulfidecanbemetallizedandthehigh-temperaturesuperconductingstatecanbeinduced.Arecordcriticaltemperature（203K）waslaterconfirmedforH3Sinanexperiment.Inthispaper,weinvestigated,withintheframeworkoftheEliashbergformalism,thepropertiesofcompressedMgH6,whichisexpectedtobeaverygoodcandidateforroom-temperaturesuperconductivity.Thisappliesparticularlytothepressurerangefrom300to400GPa,wherethetransitiontemperatureiscloseto400K.Moreover,theestimatedthermodynamicpropertiesandtheresultingdimensionlessratiosexceedthepredictionsoftheBardeen-Cooper-Schrieffertheory.Thisbehaviorisattributedtothestrongelectron-phononcouplingandretardationeffectsexistinginhydrogen-dominatedmaterialsunderhighpressure.

简介：In2016,theresearchanddevelopmentoflaserionsourcesweremainlycontributedtopromotetheperformanceoftheionsource,suchastoprolongthepulsedurationoftheionbeam,torealizetherepetitionrateoperationmodeoftheionsource.Inaddition,theproductionofhighlychargedmetallicionbeamsfromanECRionsourcewithlaserablationplasmainjectionwasalsoinvestigatedpreliminarily.Theconfinementoflaserproducedplasmawithasolenoidwasstudied.Forthispurpose,a1.5m-longsolenoidwasinstalledontheexpansionstageofthelaserionsource.

简介：Fieldemissionoccurredinsuperconductingradio-frequency(SRF)cavitiesisthemajorobstacleoftheacceleratorsoperatingathighgradient,whichpartlycausedbytheinnersurfacecontamination,suchasthehydrocarbonsandtheabsorbedresidualgas.Theplasmaprocessingcanbeaneffectivemethodtosolvethefieldemissionissues.Thepropertiesoflowtemperatureglowdischarge,whichwasargonplasmawiththechemicallyreactiveoxygen,wereinvestigatedfortheSRFcavitiesusedforCADSproject.

简介：HIRFL-CSRacceleratorfacilityhasbeenoperatingwith3ionsources,whichareLAPECR1,LECR3andSECRAL.Theseionsourcescanprovidedifferentkindsofionswithdifferentenergy.Forexample,LAPECR1mainlyprovidesH+andHe+witheextractionvoltageabove25keV,LECR3canprovidetheionbeamswithlowtomediumchargestates,includingthemetallicionswithlowmass,suchasC^4+,Ar^11+,B^3+,Mg^7+,etc.,whileSECRALaimstoproduceintenseandhighlychargedionbeams,especiallymetallicones,suchlikeKr^19+,Xe^31+,Ni^19+,Bi^31+,U^33+,andsoon.

简介：SECRALIIisthesecondfullysuperconductingECRionsourcedevelopedatIMP.It’salmosttheduplicateofSECRAL,exceptforthecryogenicsystem[1].SECRALIIhasintegratedLHerecondensationsystem,whichhasthedynamiccoolingcapacityofmorethan5W.ThemainparametersofSECRALI&IIareshowninTable1.ThemagnetsofSECRALIIhasbeensuccessfullyfabricatedandtestedin2015.In2016,SECRALIIhasbeencommissionedat18and28GHzwithOandXeionbeams,whichhasgivenverypromisingresults.

简介：Thehighpowersuperconductingradiofrequency(SRF)inputcoupleristheconnectingpartbetweentheSRFcavityandtheRFtransmissionline.WiththeRFpowertransferredthroughthecoupler,theSRFcavitycanbuiltuptheelectromagneticfieldandthenacceleratethebeams.InadditiontothisRFtransmissionfunction,italsohastoserveasavacuumbarrierfortheSRFcavityvacuum.TheHWR010couplerwhichdesignedbyIHEPisasingleceramicwindowcoupler.

简介：LECR4isthefirstECRionsourceusingevaporativecoolingtechnologyintheworld.Itsuniquefeatureisthatthesolenoidsweremadefromsolidsquarecopperwires(3.32mm×5.77mmwithinsulation),andthatallthecoilsareentirelyimmersedintheroomtemperaturecoolant.Thecoilscanproduceamaximumaxialmagneticfieldupto2.5T.LECR4aimstoprovideintensemultiplechargestateionbeamsforSSC-Linacproject-anewLinearinjectorfortheSeparatedSectorCyclotron(SSC).Presently,someionbeamswithdifferentM/QratiohavebeenacceleratedsuccessfullywiththeRFQandDTL,suchas200eμAof16O^5+,200eμAof40Ar^8+,50eμAof209Bi^30+etc.ThemeasuredtransmissionefficiencyofRFQisupto90%.ThelayoutofLECR4ionsourceandtheLEBTisshowninFig.1.

简介：TheCADSdemofacilityisaimedtobuildaprototypelinacforthelowenergypartofthecontinuouswave(CW)superconductingprotonlinacanddemonstratetechnologyinthissection[1].IntheCADSroadmap,therealizationof25MeV10mAbeamisakeypoint.Thus,basedonthe10MeVCADSInjectorIIatIMP,IMPandIHEPwillbothcontributeacryomoduletoreach25MeVatthesiteofIMP[2].Todumpthebeamfromthelinac,webuildanewhighenergybeamtransportlinewithbendingangleof90°,toavoidback-scatteringgammaandneutronbeamstodamagethelinac.Fig.1showsthelayoutofthe25MeVdemofacility.

简介：Room-temperaturetestwithhighpowerisanessentialstepbeforecouplersareinstalledonsuperconductingcavities.Anewroom-temperatureteststandisbeingdesignedatIMP.ThenewstandwillbeassembledwithaNC(normal-conducting)QWRcavity.Thepowerlossonthecavitywhencouplersareconditionedintraveling-wavemodehastobethoroughlyevaluated.Fig.1demonstratesthepowerflowintraveling-waveconditioningmode.Pe1andPe2representthepowerthatisextractedbycouplers.PfandPredenotetheforwardpowerandreflectedpower,respectively.

简介：利用水热工艺,选用有机配体3,3’,5,5’-四甲基-4,4’-联邻二氮杂茂（H2X）和CuCl2·2H2O为起始原料,合成了1个新的多酸基杂化化合物[Cu2（H2X）2（Mo6O19）]·2H2O被合成.采用X-射线单晶衍射、红外光谱、元素分析和热重分析等手段对该化合物的结构进行了表征.单晶测试结果表明该化合物为1D链状化合物,属于三斜晶系,P-1空间群,晶胞参数a=0.9469（3）nm,b=0.9544（3）nm,c=2.0599（6）nm,α=90.717（4）°,β=93.518（5）°,γ=102.802（4）°,V=1.8112（9）nm3,Z=4,R1=0.0829,wR2=0.1512.

简介：Wehavereportedthemassmeasurementsofneutron-deficientnuclides79Y,81;82Zr,83;84Nbinthisyear’sAnnualReport.However,fortheN=ZnuclidesclosetoA=80,theyieldismuchlowerandeveniftheycanbeproduced,thereisstillgreatdifficulttoidentifythembecauseoftheirquitesimilarmass-to-chargeratioandrevolutiontimes.However,theirmassareextremelyimportantforrapidprotoncaptureprocess,forexample,80Zrand84Moarewaitingpointsofrp-process.Theirmassescangreatlyeffectthereactionflowofprotoncaptureonthemandthentheabundanceoftheheaviernuclides.Inaddition,theseparationenergyof84Mo(determinedbythemassof80Zrand84Mo)hasastrongimpactonthe83Nb(p,α)reactionrateandplaysakeyroleintheformationofZr-NbFig.

简介：利用L-脯氨酸催化的5-氯水杨醛（1）与6-甲基-4-羟基吡喃酮（2）的缩合反应及硫酸铜催化下与1,3-二甲基-5-氨基吡唑（3）的串联反应,合成得到了10-氯-1,3-二甲基-5-（2-氧代丙基）色烯并[4,3-d]吡唑并[3,4-b]吡啶-6（3H）-酮（4）和10-氯-5-二乙氧基甲基-1,3-二甲基色烯并[4,3-d]吡唑并[3,4-b]吡啶-6（3H）-酮（5）.化合物5的结构通过单晶X射线衍射法确定：晶体属于三斜晶系,空间群P-1;相对分子质量Mr=803.68;晶胞参数a=1.03160（10）nm,b=1.42900（13）nm,c=1.44268（15）nm;V=1.9448（3）nm~3;Z=2;晶胞密度Dc=1.372g/cm~3;吸收系数μ=0.228mm-1;单胞中电子的数目F（000）=840.晶体结构用直接法解出,经全矩阵最小二乘法对原子参数进行修正,最终的偏离因子为R=0.0681,wR=0.2051.在晶体结构中色烯环与吡啶环及吡唑环近似于共平面.