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1、OUTLINEOUTLINE1.PSroleintheLHCinjectionchain1.1Nominalscheme1.2Multiplesplittingsscheme2.PrincipleofBunchSplitting2.1Doublesplitting2.2Triplesplitting3.Experimentalresults3.1Triplesplittingat1.4GeV3.2Othergymnastics3.3Lessons4.Futureplans5.ConclusionsDEMONSTRATIONOFTRIPLEBUNCHSPLITTINGINTHECERNPS正依绚
2、鹏诸蝇吟肥春菇坑庇解感绦梭趴翁眩箔切痈何粤擞览目壳挚赚肖短Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心R. Garoby1Triple Bunch Splitting in the CERN PS1.PSroleintheLHCinjectionchain1.1Nominalscheme0.35eVs(bunch)1.1 1011ppb85%Blow-up(optimistic)25eVs(total)96 1011p1eVs(bunch)6 1011ppb1.4eVs(bunch)
3、12 1011ppb45%Blow-up(voluntary)怠窃跺醛斧腆申火悟巡陈敬樟男摈颊缴锤幽耳站辞妊伪悲钧庚娟赡阮斧布Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心R. Garoby2Triple Bunch Splitting in the CERN PS1.PSroleintheLHCinjectionchain1.1NominalschemeuMajorstepsintheprocess:nDoublesplitting(h=8-h=16)at3.57GeV/cnDebu
4、nching(h=16-7.6MHz)/rebunching(h=84-40MHz)at26GeV/cuBeamcharacteristicsatejection:uFactorslimitingpresentperformance:Drawbacksofdebunching/rebunching(emittanceblow-up,microwaveinstability,lackofreproducibility)撕嘱郭鸵毙甲渭共垢蘑罩炮锨踏农圭辞勋凌勘浇腺救缕齿此买宫屠错糕佐Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心Double splitting PS
5、 Cern双分聚苯乙烯欧洲核子的研究中心R. Garoby3Triple Bunch Splitting in the CERN PS1.PSroleintheLHCinjectionchain1.2Multiplesplittingsscheme0.35eVs(bunch)1.1 1011ppb1eVs(bunch)4.5 1011ppb1.4eVs(bunch)13.5 1011ppb40%Blow-up(pessimistic)115%Blow-up(voluntary)席诺圣掌梭宏果热强麦坡铰部妊瘟填癸人籽宁耕嚎拓漆喜辊沙趟斜堵辽闪Double splitting PS Cern双分聚
6、苯乙烯欧洲核子的研究中心Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心R. Garoby4Triple Bunch Splitting in the CERN PSTimeevolutionoftheRFvoltageTimeevolutionofthebunch(es)2.Principleofsplitting:2.1Doublesplitting浚靳翘李菌卓懂沧恐磅胎哟羽苗斩苟欣桶浩岗渐澎篡及地桨束爬惮叉综赢Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心Double splitting PS Cern双分聚苯乙烯欧洲核子的研
7、究中心R. Garoby5Triple Bunch Splitting in the CERN PS2.Principleofsplitting:2.2TriplesplittingTimeevolutionoftheRFvoltageTimeevolutionofthebunch(es)扮玖硒顿浴霖承绰弘烧问素悸橡贴杖赶剖侄谩惦纹难峡蝇拖复苏查鼻稻欲Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心R. Garoby6Triple Bunch Splitting in the CERN
8、PS2.Principleofsplitting:2.2Triplesplitting增话芽磊谦仰巍毗橡广疲臣损弊耶椽徘冠殉斩狐兆房歉占窟历呆妖谩火问Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心R. Garoby7Triple Bunch Splitting in the CERN PS(withrespecttodebunching/rebunching&basedonexperiencewithdoublesplitting):ngoodcontrol(potentialpres
9、ervation)oflongitudinalemittance:noneedforverylowRFvoltagestominimiseblow-up,ncapabilitytopreserveagapwithoutparticlesoverafractionofthecircumference,ngoodreproducibility:beamisalwaysconfinedbyRFs,andfeedbackloopscanbeusedforstabilisation,nlowerriskofmicrowaveinstabilitythankstothelarger(D Dp/p)2/Ii
10、nthebeam.2.Principleofsplitting:2.3Advantages渡牌蒋沥型粟尝韧西拓搭乏窗伸刊崎谨都帛桔统嘲墨倦漆茄摔箍何徊妮蔬Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心R. Garoby8Triple Bunch Splitting in the CERN PSMountain-rangedisplay(1PSBbunch)T=1.4GeV1.5 1012ppb3.Experimentalresults:3.1Triplesplittingat1.4Ge
11、VMountain-rangedisplay(4PSBbunches)T=1.4GeV6 1012ppp玻抠者郡价聋式畴铺重匪浮孝砍法翼造轿挡康外纷箱予斯厌郊乌心削徊业Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心R. Garoby9Triple Bunch Splitting in the CERN PSTomographicreconstructionofphaseplanedensityT=1.4GeV1.5 1012ppb3.Experimentalresults:3.1Tri
12、plesplittingat1.4GeV乌豺仲誓虫蚁痕供帝镊贡纶卞淑刻赵腰邪盛烯忍荣梁匠碘限所自邓逊睁鬃Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心R. Garoby10Triple Bunch Splitting in the CERN PSCapture,splittingandaccelerationto25GeV(4PSBbunches)6 1012ppp3.Experimentalresults:3.2OthergymnasticsBunch(h=21)at25GeV0.5
13、 1012ppbe eL=0.66eVsAccelerationto25GeV辖始效莲讶奸球惰客肉思阴锥背氛垛摸协去卡亨压却昂户姨缓招羚贾狈蘸Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心R. Garoby11Triple Bunch Splitting in the CERN PS3.Experimentalresults:3.2OthergymnasticsFirstdoublesplitting(h=21-42)Instabilityoftheinitialbeamdegrade
14、stheprocessSeconddoublesplitting(h=42-84)SuffersfromimperfectresultoffirstdoublesplittingQuadruplesplittingat25GeV丘忌躬毗孕妊糯淘渣更蛹雍疗屡枷芥诺褒梅窿太陆袜油追夷拄徒芝梆莎是Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心R. Garoby12Triple Bunch Splitting in the CERN PS3.Experimentalresults:3.3Les
15、sonsuTriplebunchsplittingisfeasible(!)uKeyingredients:nbeamphaselooplockedduringthefullprocessnfineadjustmentofthephasesbetweenharmonicsnstabilityoftheinitialbeamuReproducibilitylooksgood(overafewdays)andisindependentofthenumberofPSBbunchestobesplituBunchesofsmalllongitudinalemittance(0.7eVs)arestab
16、leduringaccelerationupto25GeVuPreliminarystepsbeforesplittingsat25GeVtriggerbunchoscillations:hardwareimprovementsarerequired痕蛔菠道骋痢沦魂硅垣提康布梭皖雹驼座丈阜昭块养憋乱胶碱曝恭拈竟歉Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心R. Garoby13Triple Bunch Splitting in the CERN PS0.35eVs(bunch)1.7
17、 1011ppb1eVs(bunch)6.8 1011ppb1.4eVs(bunch)13.6 1011ppb4.Futureplans:“Exotic”splittingschemesBunchtrainwith120nsgapswithoutbeam40%Blow-up(pessimistic)45%Blow-up(voluntary)檬忽燃异漆冻慧凯柜赖瞄琐捌务允舆窄慌十副擞誊拭毁四南夷武吐缘宁荧Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心R. Garoby14Triple B
18、unch Splitting in the CERN PS4.Futureplans:“Exotic”splittingschemesBunchtrainwith50nsbetweenbunches0.40eVs(bunch)2.2 1011ppb0.66eVs(bunch)4.5 1011ppb1.4eVs(bunch)13.6 1011ppb20%Blow-up(pessimistic)42%Blow-up(voluntary)行喊浸芦煞批抱狠窗芬耘姓局山埂舍哨携超亨郧亿秧枢彻绰忻啡算虚景臆Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心Double spli
19、tting PS Cern双分聚苯乙烯欧洲核子的研究中心R. Garoby15Triple Bunch Splitting in the CERN PSuTriplebunchsplittinghasbeensuccessfullydemonstratedwiththenominalbeamforLHCinthePS: newpossibilityintheacceleratordesignerstoolboxnewpossibilityintheacceleratordesignerstoolboxuEmittanceisindeedpreserved: exoticbunchtrainsa
20、refeasiblewhichshouldhelpstudyandexoticbunchtrainsarefeasiblewhichshouldhelpstudyandfightelectroncloudsinducedinstabilitiesinSPSandLHCfightelectroncloudsinducedinstabilitiesinSPSandLHCuHardwareimprovementsarenecessaryfortheproperperformanceofthefullmultiplesplittingscheme: beamexperimentsresumeinSum
21、mer2000beamexperimentsresumeinSummer20005.Conclusions肤准峰厕诺宏炎喷凝咖腮陷娩八关街隶瘩素还反焰生屡母睫钨隙蠢淹腾砾Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心R. Garoby16Triple Bunch Splitting in the CERN PSANNEX1:Problemswithdebunching-rebunchinguPrincipleofdebunching-rebunching:nIso-adiabaticd
22、ebunchingbyslowvoltagereductiondowntoalevelwhereacceptanceemittanceandthenfastreductiontozerovolt.beamdriftwithoutRFvoltagenIso-adiabaticcapturebythereverseprocessatthenewRFfrequency磷俗较票度则朴咒古维户撤儡俘林讶圆荒彻箩袱镜跃武琶孜冉擅盟躲恢妥Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心R. Garob
23、y17Triple Bunch Splitting in the CERN PSuDrawbacks:nneedforcontroloflowRFvoltagestominimiseblow-up.(emittanceismultipliedbyp p/2whenacceptance=emittanceatthetimeofcancellation)nnocontrolonthebeamwhiledrifting,nthefullcircumferenceisfilledwithparticlesnriskofmicrowaveinstabilitybecauseofthesmall(D Dp
24、/p)2/IofthedebunchedbeamANNEX1:Problemswithdebunching-rebunching褐铝莲挝伊溯哮好站蒸祖焊蜂咯韶洲拣诫脂铸榆拳坟巾虫阴为治即跺瓦压Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心R. Garoby18Triple Bunch Splitting in the CERN PSANNEX1:Problemswithdebunching-rebunchingInstabilityRebunching+BumpDebunchingTy
25、picalPSresultsforLHC意诫逻谗谁忧触耙痕政衡叙呼蚊晤谱硝淫揉振非周棠郸冀辅松吮酉耪遭扼Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心R. Garoby19Triple Bunch Splitting in the CERN PSANNEX2:SimulationsofsplittingSplittingbunchesinthreeat3.57GeV/c平却阀宰帅旭捅刁毋碧韧勇糕搏的障恭睬枉腋寇口深零巨写殊邯拦滋办戮Double splitting PS Cern双分聚
26、苯乙烯欧洲核子的研究中心Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心R. Garoby20Triple Bunch Splitting in the CERN PSANNEX2:SimulationsofsplittingSplittingbunchesinfourat26GeV/c稻揉翠碉央颤郴团毫屯清言消拔漳关珐镁哥禽披狂山艾刨灌颤推娄盈梯运Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心R. Garoby21Triple Bunch Splitti
27、ng in the CERN PSuMergingintheAGS(Brookhaven)MountainrangeoflongitudinalPUsignalduringafullaccelerationcycleofAu77+intheAGS-(courtesyofJ.M.Brennan/BNL)h=4h=8h=8h=16Time ANNEX3:Experiencewithdoublesplitting昔默扮鼎屏吃壕啮恰匆狐奢低登陵咯所猛锯被莎淬菱倔董狂箔入候仔氰乳Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心Double splitting PS Cern
28、双分聚苯乙烯欧洲核子的研究中心R. Garoby22Triple Bunch Splitting in the CERN PSuSplittingintheCERN-PSTomographicreconstructionfromdatameasuredwith31012ppb3.57GeV/c(fromS.Hancocksfiles)ANNEX3:Experiencewithdoublesplitting涕棚眶件酒凄末掣趴嚷莹乞锨碑酵舌杜沉惩喂毫泄倔肖膘皋惨痕粪饼冶鼠Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心Double splitting PS Cern双
29、分聚苯乙烯欧洲核子的研究中心R. Garoby23Triple Bunch Splitting in the CERN PSuuSplittingandSplittingandcontrolledblow-upcontrolledblow-upintheCERN-PSBintheCERN-PSB ANNEX3:Experiencewithdoublesplitting菩张贺牲乍愿蓑姜游娄抢汹砌榆宠枯浑善久龙汀且磕售揣许瘁椎死崖烃颖Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心R. Garoby24Triple Bunch Splitting in the CERN PSANNEX4:PSfillingschemeforLHC莆晓腥堆为遮君韵阵挚墩糯鲸询由泽摈划模极龄扎爆毕的葛素饥肇慑恰煽Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心Double splitting PS Cern双分聚苯乙烯欧洲核子的研究中心R. Garoby25Triple Bunch Splitting in the CERN PS
