High Brightness Electron Beam Diagnostics and their ... - CASA
High Brightness Electron Beam Diagnostics and their ... - CASA
High Brightness Electron Beam Diagnostics and their ... - CASA
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<strong>Beam</strong>DynamicsStudies Chapter6<br />
undulatorinthebacklegtransportasitispresentlyenvisionedfortheIRFELUpgrade. ues.Recentlywestartedtostudytransverseemittancegrowthtoassessifwecouldrelocatedthe<strong>and</strong>verifythatthebeamparametersclosetotheundulatorinsertionarewithinthespeciedval- optimize<strong>and</strong>underst<strong>and</strong>thephotoinjector.Theyhavebeenusedtooptimizethebunchingscheme, InthepresentChapterwewouldliketopresentfewapplicationsofthediagnosticswehaveprevi-<br />
6.1StudyofthePhotoinjector ouslydescribed.Essentially,tothepresentdate,theseinstrumentshavebeenhelpfulintryingto<br />
driver-accelerator;everycaremustbetakentopreventanybeamdegradation<strong>and</strong>insurethebeam parametersremainwithinthespeciedvalues.Sincetheinjectortransportslowenergy,highcharge bunches,eectssuchasspacechargehavetobetakenintoaccount. AfewfeaturesoftheDCphotoemission-basedinjector,especiallythebeamgenerationusingthe GaAsphotocathode,havebeendescribedinChapter1.Hereweshallonlyconcentrateonthebeam transportfromthegunexituptothefrontend. Theinjectorbeamlineproispictureding.6.1;itcanbedividedintothreemainregions: Thebeamgeneration<strong>and</strong>lowenergytransportisprobablyoneofthemostcrucialissueforthe<br />
2.Thehighgradientacceleratingstructure,composedoftwoCEBAF-typesuperconducting 1.The350keVtransportlinethatconsistsoftwosolenoidlenses<strong>and</strong>awarmbunchercavity,<br />
Inthissectionwewillstudyeachregion,trytoprovideasimplemodelofbeamevolution,wewill comparewithsimulations,<strong>and</strong>whenpossible,benchmarkwithexperimentalresults<strong>and</strong>provide 3.The10MeVregionthatcanbesubdividedintotwoparts:aquadrupoletelescopethatis chicanethatconsistsofthreebendsarrangedina\staircase"conguration. usedtomatchthetransversephasespaceintothemainlinac<strong>and</strong>anachromaticinjection cavitiescapableofacceleratingthebeamuptoatotalenergyofapproximately10MeV,<br />
tentativeexplanationofdiscrepancies.However,wewillnotdescribethephotoemissionprocess <strong>and</strong>accelerationinthegunchambersinceithasbeentreatedinReference[14]. 137