High Brightness Electron Beam Diagnostics and their ... - CASA

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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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HighBrightnessElectronBeamDiagnosti
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eratedupto48MeVpriortothelasingsyst
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IthanktheCEBAFmachineoperators,with
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3.4MeasurementoftheLongitudinalResp
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5.6ZerophasingTechniqueforBunchLeng
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ListofTables 3.2Comparisonofcoecien
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ListofFigures 1.1Comparisonoftheexp
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3.11Momentumcompactionandnonlinearm
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4.18Overviewofthephasespacesampling
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5.16Interferogrammeasuredfordierent
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6.10Comparisonofthermstransversehor
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Chapter1 UVdomainandareplannedtogen
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space-chargeinthelowenergyregime,an
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!Vjitsthevelocity,and!Xjisthepositi
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equation boundarybetweenvacuumandam
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10 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.
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1.0 0.8 0.6 0.4 0.2 E=10 MeV E=42 M
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00000000000000000000000000000000000
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harmonicwithproperchoiceoftheKvalue
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Bu(rms)0.28T ParameterValueUnit Nu
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2.7TheJeersonLabIRproject usedasexp
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Study TheFELdriveraccelerator:Latti
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ParameterValue x -0.178 x(m) 8.331
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Thepurposeofmeasuringthetransverser
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computedusingthelatticeset-upuseddu
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etatronexcitationaspicturedingure3.
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∆ x (mm), Corrector 0F00H ∆ x (
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1 0.5 0 spreadoftheparticlewassetto
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2 1 −5 −3 −1 1 3 5 k (m q −
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Experimentallythecalibrationcoecien
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tioned.FromthetransferfunctioninFig
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numericalsolution[56].Thisapproxima
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0.03 . .... . .. ... . .. ..... . .
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ε x (mm−mrad) Nominal 6 4 2 cryo
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2.2 2 1.8 Figure6.10:Comparisonofth
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6 4 2 Figure6.12:\R55"transfermapfo
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10 1 5 10 0 500 1000 1500 2000 2500
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EnergySpread(%) BunchLength(mm) Par
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15 Effect of RMS energy Spread 10 F
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6.4.4BunchSelfInteractionviaCoheren
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100 -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0
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Inthesecondseriesofrun,wewereableto
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Conclusion Chapter7 Therecirculator
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[2]Y.Shibata,T.Takahashi,T.Kanai,K.
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[29]J.-C.Denard,C.Bochetta,G.Traomb
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[65]B.C.Yunn,\ImpedancesintheIRFEL"
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TEM:transverseelectricmagnetic. TOF
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B.2Anoteonspacecharge Wedenetheslop
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B.3.3PARMELA FeaturesofJeersonLabVe
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Initialization MAIN Stop INPUT DECK
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C.0.6TheDispersionRelationsfor^S(!)
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have: Howeveritshouldbenotedthatweh
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FigureD.1:OverviewoftheRF-controlsy
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High Brightness Electron Beam Diagnostics and their ... - CASA

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