HIRFL-CSR重离子束内散射效应

《HIRFL-CSR重离子束内散射效应》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、131ò110ÏpUÔn†ØÔnVol.31,No.102007c10HIGHENERGYPHYSICSANDNUCLEARPHYSICSOct.,2007IntrabeamScatteringofHeavyIonsatHIRFL-CSR*1;2;1)111MAOLi-JunYANGXiao-DongXIAJia-WenWEIBao-Wen1(InstituteofModernPhysics,ChineseAcademyofSciences,Lanzhou730000,China)2(GraduateUniversi

2、tyofChineseAcademyofSciences,Beijing100049,China)AbstractSmall-anglemultipleintrabeamscattering(IBS)isanimportanteectforheavy-ionstorageringswithelectroncooling,becausethecoolingtimeisdeterminedbytheequilibriumbetweencoolingandIBSprocess.Allusuallyusednumerical

3、algorithmsofIBSgrowthratecalculationsarebasedonthemodelofthecollisionsproposedbyA.Piwinski,butthisresultisamultidimensionalintegral.Inthispaper,theIBSgrowthratesaresimulatedforHIRFL-CSRusingsymmetricellipticintegralmethod,andcomparedwithseveralavailableIBScodere

4、sults.Keywordselectroncooling,intrabeamscattering,emittance,momentumspread1IntroductionbetweenthecoolingandtheIBSeects.ThisisthereasonwhytheIBSprocessinHIRFL-CSRmustbeHIRFL-CSR(HeavyIonResearchFacilityinsimulated.Lanzhou-CoolingStorageRing)isamulti-purposeheavy

5、ionstorageringthatconsistsofamainring2IBSgrowthrateexpression(CSRm),anexperimentalring(CSRe)andaradioac-[1]tivebeamline(RIBLL2)toconnectthetworings.J.BjorkenandS.MtingwaconsideredtheGaus-Twoelectroncoolerslocatedinthelongstraightsec-sianphase-spacedistributionfo

6、rbeamandgaveationsoftheCSRmandtheCSRe,respectively,for3-dimensionalintegralexpressionforthetotal6-heavyionbeamcooling.IntheCSRm,e-coolerwilldimensionalIBSgrowthratebasedonA.Piwinski'sbeusedforthebeamaccumulationattheinjection[3]model,energyrangeof7

7、30MeV/utoincr

8、easethebeamin-232tensity.IntheCSRe,e-coolerwillbeusedtocompen-1mionrpnioncLC=satethegrowthofbeamemittanceduringinternal-Z1d1=2targetexperimentsortoprovidehighqualitybeams()2+120(1+)3=2(2+)3=2(3+)1=2forthehigh-resolutionmassmeasurementsofnuclei.E

9、lectroncoolingisafastprocessforincreasingtwocyclicpermutations;[2]thephase-spacedensityofstoredionbeams.Itis18achievedbyCoulombcollisionbetweenionbeamandwhererpiscla