BEPCⅡ电子枪系统测试与运行

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󰀁30󰀃󰀁5󰀁2006󰀁5󰀂󰀁󰀁󰀁󰀁󰀁󰀁󰀁󰀁HIGHENERGYPHYSICSANDNUCLEARPHYSICSVol.30,No.5May,2006

ExperimentandOperationofBEPC󰀁ElectronGunSystem*

LIUBoGUMeng-Ping1)WANGShu-HongCHIYun-LongYANGXing-Wang

TIANShuang-MinLIUWei-BinYEQiang

(InstituteofHighEnergyPhysics,CAS,Beijing100049,China)

AbstractThenewelectrongunsystemfortheBEPC󰀁wastestedonthetestbenchinJuly,2004,and

hasbeenputintooperationsinceNov.2004.Thisarticledescribestheexperimentresultsandoperation

statusofthisnewsystem.Thedesigncurrentofthegunis10Aforthepulselengthof1nssinglebunch

ortwobuncheswithrepetitionrateof50Hz.Thegunisoperatedwithapulsedhighvoltagepowersupply

whichcanprovideupto200kVhighvoltage.Someimportantcorrelationcurvesareobtainedduring

theexperiment.Two-bunchoperationisavailableandsomeelementarytestshavebeenperformed.The

measurementresultsincludingbeamcurrentandbeamemittanceshowthatthesimulationsperformed

duringdesignstageareroughlyconsistentwiththepractice.Thepracticaloperationshowsthatthedesign

andmanufacturearebasicallysuccessful.

Keywordselectrongun,operation,experiment,simulation

1Introduction

TheelectrongunusedfortheBEPCisacon-

ventionalthermionictriodegunequippedwiththe

EIMACY824cathode-gridassembly[1],beenworking

at80kVhighvoltagewith2.5nspulsewidth,and

thebeamcurrentisabout5A.Inordertoincrease

Table1.MainspecificationsoftheelectrongunfortheBEPC󰀁[3].

typethermionictriodegun

cathodeY796(EIMAC)dispenser

beamcurrent(max.)A>10

highvoltageofanodekV150∼200

biasvoltageofgridV0∼−400

operationmode11nssinglebunch

operationmode21nstwobunches

operationmode32.5µssinglebunch

repetitionrateHz12.5,25,50

Received11October2005,Revised22December2005*SupportedbytheBEPC󰀁Project1)E-mail:gump@mail.ihep.ac.cn466—469󰀁5󰀁󰀁󰀁󰀂󰀂BEPC󰀁󰀃󰀁󰀁󰀁󰀁󰀂󰀁󰀁󰀁󰀁467468󰀁󰀁󰀁󰀁󰀁󰀁󰀁󰀁(HEP&NP)󰀁30󰀁󰀁5󰀁󰀁󰀁󰀂󰀂BEPC󰀁󰀃󰀁󰀁󰀁󰀁󰀂󰀁󰀁󰀁󰀁469

References

1EimacTechnicalData8755,VarianEIMACDivision,301IndustrialWay,SanCarlos,California940702OhsawaSetal.Pre-InjectorofthePF2.5-GeVLinacfortheKEKBanditsPerformance.ProceedingoftheInter-nationalWorkshopone+e−SourcesandPre-AcceleratorsforLinearColliders.1994.465—4793PEIGuo-Xietal.OverviewofBEPC󰀁LinacUpgrade.PreliminaryDesignReportofBEPC󰀁-Linac:IHEP-BEPC󰀁-SB-03.20024WANGShu-Hongetal.HEP&NP,2002,26:1184(inChinese)(󰀂󰀁󰀁󰀂.󰀁󰀃󰀁󰀁󰀁󰀃󰀁󰀁,2002,26:1184)

BEPC󰀁󰀁󰀁󰀁󰀁󰀁󰀁󰀁󰀁󰀁󰀁*

󰀂󰀂󰀁󰀁󰀁1)󰀁󰀁󰀂󰀁󰀁󰀁󰀁󰀁󰀂󰀁󰀁󰀂󰀂󰀃󰀁󰀂󰀁

(󰀁󰀂󰀁󰀁󰀁󰀁󰀃󰀁󰀁󰀂󰀂󰀁󰀁󰀁100049)

󰀁󰀁2004󰀂7󰀁BEPC󰀁󰀄󰀃󰀁󰀁󰀁󰀁󰀃󰀂󰀅󰀃󰀃󰀁󰀃󰀂󰀅,󰀇󰀂11󰀁󰀂󰀂BEPC󰀁󰀁󰀂󰀄󰀂󰀃󰀂󰀁.󰀁󰀆

󰀃󰀄󰀃󰀁󰀁󰀁󰀁󰀁󰀂󰀅󰀁󰀂󰀁󰀂󰀄.󰀃󰀁󰀁󰀉󰀂󰀃󰀄10A,󰀂󰀁1ns,󰀃󰀁󰀁󰀁50Hz,󰀂󰀂󰀂󰀂200kV,󰀅󰀄󰀂󰀂

󰀂󰀃󰀁󰀂󰀂󰀂󰀁󰀃󰀃.󰀆󰀂󰀂󰀂󰀁󰀁󰀃󰀁󰀃󰀃󰀃󰀁󰀄󰀁󰀄󰀂,󰀇󰀁󰀃󰀁󰀃󰀃󰀁󰀁󰀁󰀂󰀂󰀂󰀅.󰀄󰀂󰀁󰀁󰀈󰀄󰀂󰀂

󰀂󰀂󰀅󰀂󰀁󰀄󰀂󰀉󰀂󰀁󰀅󰀁󰀂󰀃󰀃󰀃󰀁󰀇󰀄󰀁󰀂󰀃󰀃󰀂󰀂󰀃󰀃󰀂.󰀁󰀃󰀁󰀁󰀂󰀃󰀂󰀁󰀂󰀂󰀁󰀃,󰀂󰀉󰀂󰀁󰀂󰀄

󰀄󰀁󰀃󰀁.

󰀁󰀁󰀁󰀃󰀁󰀁󰀂󰀅󰀂󰀁󰀃󰀁