High Brightness Electron Beam Diagnostics and their ... - CASA
High Brightness Electron Beam Diagnostics and their ... - CASA High Brightness Electron Beam Diagnostics and their ... - CASA
2.0 1.8 10 -1 2 5 10 0 2 5 10 1 1.6 SOLENOID FIELD 275 G Figure4.25:Emittanceasafunctionofthechargeperbunchfortwodierentmacropulsewidth 1.4 (10secand50sec). 1.2 1.0 0.8 0.6 2 Charge (pC) (mm-mr) pulse 10 sec pulse 50 sec
Characterization LongitudinalPhaseSpace Chapter5 5.1Introduction Asmentionedearlier,inChapter2,theFELgainstronglydependsonthebunchlengthand Thebunchingprocess,alongthebeamtransport,iscontrolledbyseveralelements:awarmbuncher energyspreadachievedinthevicinityoftheundulatormagnet.Henceitisofprimeimportanceto properlyinstrumentthedriver-acceleratorinordertomeasurethesequantitiesatcriticalpointof thebunchingstage. whichconsistsinestimatingthebunchpropertiesbydetectingcoherentradiationemittedfromthe bunch,andtime-basedmethods. thereforecanallowtoisolateaproblemormonitordriftsinthesystem.Forsuchapurpose severaldiagnosticshavebeendeveloped.Thesediagnosticsincludefrequencydomainmethods, chicanes.Inordertomakesurethebunchingprocessisperformingadequately,itisworthwhileto havemanylongitudinaldiagnosticsthatcanprovideinformationonhowthebunchingisperforming. Alsotheycanbeusefultoidentifyatwhichstagethebunchdynamicsisnotasexpectedand cavity,SRF-cavitieslocatedintheinjectorandinthemainlinac,andtheinjectionandby-pass Alongwithbunchlengthmeasurement,thelongitudinalphasespaceemittancecanbeestimated, 5.2TheLongitudinalPhaseSpaceManipulationintheIRFEL manipulationinthedriveraccelerator. undercertainconditions,providedonecanmeasuretheintrinsicenergyspread. IntheIRFEL,bunchformationstartsattheelectrons'emissionfromthephotocathodewhichis Bothmeasurementsaredescribedinthischapter,afterdiscussingthelongitudinalphasespace illuminatedbyadriver-laserwhoseopticalpulseisapproximately47psec(FWHM),asmeasuredby autocorrelationtechnique1.Thereforeatthecathodesurface,theelectronsaregatheredinbunch ofapproximately47psec(FWHM),ifweignorethebunchlengtheningduetotheGaAswafertime 1M.D.Shinn,privatecommunication 93
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Characterization LongitudinalPhaseSpace Chapter5<br />
5.1Introduction Asmentionedearlier,inChapter2,theFELgainstronglydependsonthebunchlength<strong>and</strong> Thebunchingprocess,alongthebeamtransport,iscontrolledbyseveralelements:awarmbuncher energyspreadachievedinthevicinityoftheundulatormagnet.Henceitisofprimeimportanceto properlyinstrumentthedriver-acceleratorinordertomeasurethesequantitiesatcriticalpointof thebunchingstage.<br />
whichconsistsinestimatingthebunchpropertiesbydetectingcoherentradiationemittedfromthe bunch,<strong>and</strong>time-basedmethods. thereforecanallowtoisolateaproblemormonitordriftsinthesystem.Forsuchapurpose severaldiagnosticshavebeendeveloped.Thesediagnosticsincludefrequencydomainmethods, chicanes.Inordertomakesurethebunchingprocessisperformingadequately,itisworthwhileto havemanylongitudinaldiagnosticsthatcanprovideinformationonhowthebunchingisperforming. Alsotheycanbeusefultoidentifyatwhichstagethebunchdynamicsisnotasexpected<strong>and</strong> cavity,SRF-cavitieslocatedintheinjector<strong>and</strong>inthemainlinac,<strong>and</strong>theinjection<strong>and</strong>by-pass<br />
Alongwithbunchlengthmeasurement,thelongitudinalphasespaceemittancecanbeestimated, 5.2TheLongitudinalPhaseSpaceManipulationintheIRFEL manipulationinthedriveraccelerator. undercertainconditions,providedonecanmeasuretheintrinsicenergyspread.<br />
IntheIRFEL,bunchformationstartsattheelectrons'emissionfromthephotocathodewhichis Bothmeasurementsaredescribedinthischapter,afterdiscussingthelongitudinalphasespace<br />
illuminatedbyadriver-laserwhoseopticalpulseisapproximately47psec(FWHM),asmeasuredby autocorrelationtechnique1.Thereforeatthecathodesurface,theelectronsaregatheredinbunch ofapproximately47psec(FWHM),ifweignorethebunchlengtheningduetotheGaAswafertime 1M.D.Shinn,privatecommunication 93
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