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1、130ò14ÏpUÔnØÔnVol.30,No.42006c4HIGHENERGYPHYSICSANDNUCLEARPHYSICSApr.,2006LogicofQuenchProtectionAssemblyforBEPC///InteractionRegionSuperconductingMagnet1)2)CHENFu-SanCHENGJian(InstituteofHighEnergyPhysics,CAS,Beijing100049,China)AbstractTwosuperconducti
2、ngmagnetcomplexesareusedinBEPC/interactionregion.Thecorre-spondingquenchprotectionsystemdividesallrelatedfaultsintotwoclassesandtakesdifferentprotectionactionsaccordingtotheurgencydegree.SinceBEPC/hastwooperatingmodesandthesuperconductingmagnetsusedifferent
3、powersuppliesindifferentoperatingmodes,thequenchprotectionsystemmusttakethemodeswitchingintoconsideration.KeywordsBEPC/IRsuperconductingmagnetcomplex,quenchprotectionsystem,quenchprotectionlogic1IntroductionBEPC/isanupgradeprojectofBEPC,theBeijingElectronP
4、ositronCollider.Itisdesignednotonlyasanelectron-positroncolliderintheen-ergyrangeof1.55GeVto1.89GeV,butalsoasadedicatedsynchrotronradiationfacilityattheen-ergyof2.5GeV.Inordertomeetthemachinere-quirements,asuperconductingmagnetcomplexwillFig.1.Thecoillayo
5、utschematic.beusedoneachsideoftheinteractionpoint(IP).TheBEPC/interactionregion(IR)superconduct-ingmagnetcomplexconsistsof3anti-solenoid(AS1,AS2,AS3),1quadrupole(SCQ),1dipole(SCB,alsousedasahorizontaldipolecorrectorHDCincollidermode)and2setsofcorrectorcoi
6、l(VDC,SKQ).AS1,AS2andAS3,togethernamedAS,arepoweredwithone1300AunipolarpowersupplyinserieswhileAS2Fig.2.ThepowerconnectionconfigurationforAS.andAS3havetheirindependenttrimpowersupplies[1—3]toachievefinetuning.ThemagnetcoillayoutSimulationsindicatethatthesto
7、redenergyattheisshowninFig.1andthepowerconnectionconfig-operatingcurrentishighenoughtoburnthecoilsif[3]urationforASisshowninFig.2.Table1givesthethemagnetquencheswithoutaprotectionsystem.mainparametersofthemagnetcoils.Anactivequenchprotectionsystemisnecessa
8、rytoswitchoffthepowersuppliesandextractthestoredReceived15August2005,Revised11October20051)E-mail:chenfs@ihep.ac.cn2)E-mail:chengj@ihep.ac.cn349—353350pUÔnØÔn(HEP&NP)130òenergy.Thequenchprotectionsystemforthismag-Fig
