简介:StableoperatingregionintheHL-1Mtokamakhasbeenextendedbymeansofwallconditioning,corefuellingandcurrentcontroltechniques.Themechanismsoftheextensionareanalyzedinthispaper.Lithiumizationdiminishestheimpuritiesandhydrogenrecyclingtothelowestlevel.Afterlithiumizationahighdensityupto7×1019m-3wasobtainedeasilybystronggaspuffingwithordinaryohmicdischargealone.MoreattractivelywefoundthatmetalLi-coatingexhibitedtheeffectsofwallstabilization.Thelowqalimitwithhigherdensitywasextendedbyafactorof1.5~2incomparisonwiththatforboronization,and1.2forsiliconization.Siliconizationnotonlyextendedstableoperatingregionsignificantlybyitself,butalsoprovidedagoodtargetplasmaforotherexperimentsofraisingdensitylimit.Corefuellingschemesarefavourableespeciallyforsiliconizedwallwithahigherlevelofmedium-Zimpurity(Z=14).Aftersiliconizationthemaximumdensitynearto1020m-3wasachievedbyacombinationofsupersonicmoleculebeaminjectionandmultipelletinjection.ThenewdefinedslopeofHugilllimitillustratingmoreclearlythesituationunderlowqaandhighnedischargeswascreatedtoindicatethenewregionextendedbycombiningIpramp-upwithcorefuelling.TheslopewithalargeMurakamicoefficientincreasedbyafactorof50~60%.
简介:Vacuumtreatmentandion-beambombardmentaretwomajorprocessesinthelowenergyion-beamimplantation.Toaccuratelystudythecontributionsofthesetwomajorfactorstothebioeffectsseparately,theM_1generationvariationofArabidopsisthalianawithion-beamimplantationandvacuumtreatmentwerecomparedthroughaseriesofkeyplantdevelopmentparametersincludingmorphologicalobservation,biochemicalassayandRAPD(randomamplifiedpolymorphicDNA)analysis.Theresultsshowedthation-beamimplantationhadobviouseffectonalmostalloftheseparameters,andthevacuumtreatmenthadsomeimpactsonseveralmorphologicalparameterssuchastheboltingtimeandthelengthoftheprimarystem.Takingtheresultstogether,theindicationisthatvacuumtreatmenthassomeslightcontributionstothebioeffectsofion-beamimplantationwhileion-beambombardmentitselfisthemajorcreatorofthebioeffects.
简介:InthedischargeofEASTtokamak,itisobservedthat(2,1)neoclassicaltearingmode(NTM)istriggeredbymodecouplingwitha(1,1)internalmode.Usingsingularvaluedecomposition(SVD)methodforsoftX-rayemissionandforelectroncyclotronemission(ECE),thecouplingspatialstructuresandcouplingprocessbetweenthesetwomodesareanalyzedindetail.TheresultsofSVDforECErevealthatthephasedifferencebetweenthesetwomodesequalstozero.Thisisconsistentwiththeperfectcouplingcondition.Finally,performingstatisticalanalysisofγ1/1,ζ1/1andω2/1,wefindthatγ1/1moreaccuratelyrepresentsthecouplingstrengththanζ1/1,andγ1/1isalsostronglyrelatedtothe(2,1)NTMtriggering,whereγ1/1isthewidthof(1,1)internalmode,ζ1/1istheperturbedamplitudeof(1,1)internalmode,andω2/1denotesthemagneticislandwidthof(2,1)NTM.
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简介:日本福岛核事故已过去一年,核事故造成的影响依然在延续,专家和学者对福岛核事故从管理、技术、文化及应急响应等角度进行了探讨和深入研究,各国监管部门进行核安全综合检查和相关的压力测试,核设施的纵深防御概念在延伸和拓展,从福岛核事故再次审视核安全的政府、法律和监管框架,对于风险社会下核安全水平的提升意义重大而深远。
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