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

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4 2 thepickupcavityislocateddownstreamthecryounitafteradriftinadispersion-freeregion. and2Dsupersh)atthepickupcavitylocatedintheinjectionchicaneand(2)forthecasewhere Figure6.11:\R55"transfermapgeneratedwithparmelafor(1)dierentcavitymodel(3Dmaa 0 3D−MAFIA model −2 2D−Superfish model MAFIA + Dispersion Free Table6.1:Nominalinjectorsettingsbeforetherstseriesmeasurement. Buncherzero-crossing0.28MV/m ElementsPhase Laser Cavity#4on-crest Cavity#3-20dego-crest9.10MV/m referencephaseN/A Gradient 11.8MV/m −4 −40 −20 0 20 40 Drive Laser Phase (RF−Deg) tooperatethebuncherat0.32MV/msinceitprovidesapatternveryclosetothesimulatedone. AsecondseriesofmeasurementwasperformedaftertheFELphotonbeamwasoptimizedfor imentalphase-phasecorrelationpatternwiththesimulatedoneoccursforabunchergradientof approximately0.32MV/m;suchagradientdoesnotcorrespondtotheminimumenergyspreadon thedispersiveviewer. Secondseriesofmeasurementsperformed Itisseenfromthegure6.10thatthe\best"bunchergradientdevisedbymatchingtheexper- 60pC/bunch6.Thevalueforthephasesandgradientsrecordedbeforethemeasurement,after theFELwasoptimized,aregatheredintable6.2.Thephase-phasepatternmeasurediscompared ingure6.13withthe\ideal"oneobtainedbynumericalsimulations.Theagreementbetweenthe measurementandsimulationisexcellent.Thisagreementvalidatesthemethodforsettingup thelongitudinaldynamicsmanipulationintheIRFELinjector.Basicallythetechniqueconsistsof 6thisoptimizationconsistedofmaximizingtheoutputFELpowerbyvaryingthebunchergradient T−O−F. at Pickup cavity (RF−Deg)
6 4 2 Figure6.12:\R55"transfermapfordierentexperimentaloperatingpointsofthebunchergradient. Themeasurementsarealsocomparedwiththe\ideal"injectordevisedfromnumericalsimulations. (Firstseriesofmeasurement) 0 −2 gradient=0.28 −4 gradient=0.30 gradient=0.32 Simulation Table6.2:Nominalinjectorsettingsbeforethesecondseriesofmeasurement. Buncherzero-crossing0.32Mv/m ElementsPhase Laser Cavity#4on-crest Cavity#3-20dego-crest9.10MV/m referencephaseN/A Gradient 11.8MV/m −6 −40 −20 0 20 40 Drive Laser Phase φIN (RF−Deg) reproducingthe\optimum"correlationpatternbyonlyplayingwiththebunchergradient. 6.2BunchCompressionStudiesintheLinac Uptonowwehaveonlymentionedthecompressorchicane,withoutmuchdiscussion.Thischicane consistsoffourrectangular-edgedipole-magnetsarrangedsymmetrically.Thoughitspurposeis tobypasstheopticalcavityoftheFEL,italsoservesasabunchcompressorusingthestandard longitudinaltransfermatrixofthechicaneandletseehowhz2ipropagatefromthechicaneentrance magneticcompressionscheme.Again,asimplewayofdemonstratingtheprincipleistopropagate thegeneralizedmomentsofthelongitudinaldistributionacrossthechicane.LetRbethe22 T−O−F. at Pickup Cavity φ OUT (RF−Deg)
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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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Pickup Experiment #2 #3 #4 Simulati
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Fromthesebothmeasurementitispossibl
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. . . . . . . . . . . . . . . . . .
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10 5 Sext. ON Figure3.20:Eectofthes
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spaceabeamthatconsistsofNparticles,
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Asforthegeometricemittanceonecanden
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(a) ceramic radiator beam x-wire be
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and validundertheassumptionofaunifo
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1000 900 800 700 Figure4.4:Steadyst
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Fraction of Beam enclosed within (%
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5 2 2 3 4 5 6 7 8 9 10 0 10 5 2 Foi
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Actuator Inserts Foil and Mirror CI
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shortterm,touseasbeamdensitymonitor
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Alongwiththeseimplementedoperations
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whereiistheerrorontheithbeamsizemea
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Let'sassumethethinlensapproximation
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obtainedviathestatisticalanalysis.T
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20 18 16 . 14 . 12 . Figure4.14:Rel
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100 10 −3 10 −2 10 −1 10 that
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multislits mask (copper) Aluminum F
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TheReductionoftheSpaceChargeconditi
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. . . . . . . . . . . . . . . . . .
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Table4.7:Typicalsystematicerroronem
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180 8 160 6 Figure4.22:Anexampleof2
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4.0 3.5 3.0 2.5 Figure4.24:Emittanc
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Characterization LongitudinalPhaseS
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concentrateonthebeamparametersinthe
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1.1 1 mrad 0.9 5 mrad mainlyduetoth
Page 121 and 122: Population Population 100000 90000
Page 123 and 124: Theequation5.8yields: f()=jZ+1 11Xn
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Page 127 and 128: contrastintheCEBAFmachine,varyingas
Page 129 and 130: 1.5 1 correspondtothevarianceofveco
Page 131 and 132: Ε’ 2 B Mirror M 2 Ε2 Polarizer
Page 133 and 134: FinallyitisinterestingtonotethatFou
Page 135 and 136: Itsautocorrelationis:S(z)=8>:(1=w2)
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Page 141 and 142: Asarstapproximation,wecanestimatetr
Page 143 and 144: errorpropagation8theoryappliedonEqn
Page 145 and 146: inducedbyspacechargeisnotaconcernin
Page 147 and 148: Golay Cell Signal (V) Golay Cell Si
Page 149 and 150: Golay Cell Ouput (V) Golay Cell Oup
Page 151 and 152: 150 100 5 4 Figure5.19:Energyspectr
Page 153 and 154: Figure5.23:picturaleectoflongitudin
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Page 157 and 158: σ x (m) x 10−3 5 4 3 2 1 0 0 5 1
Page 159 and 160: BeamDynamicsStudies Chapter6 undula
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Page 163 and 164: Space Charge over Emittance Ratio (
Page 165 and 166: numericalsolution[56].Thisapproxima
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Page 169 and 170: ε x (mm−mrad) Nominal 6 4 2 cryo
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Page 177 and 178: EnergySpread(%) BunchLength(mm) Par
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Page 187 and 188: Conclusion Chapter7 Therecirculator
Page 189 and 190: [2]Y.Shibata,T.Takahashi,T.Kanai,K.
Page 191 and 192: [29]J.-C.Denard,C.Bochetta,G.Traomb
Page 193 and 194: [65]B.C.Yunn,\ImpedancesintheIRFEL"
Page 195 and 196: TEM:transverseelectricmagnetic. TOF
Page 197 and 198: B.2Anoteonspacecharge Wedenetheslop
Page 199 and 200: B.3.3PARMELA FeaturesofJeersonLabVe
Page 201 and 202: Initialization MAIN Stop INPUT DECK
Page 203 and 204: C.0.6TheDispersionRelationsfor^S(!)
Page 205 and 206: have: Howeveritshouldbenotedthatweh
Page 207: FigureD.1:OverviewoftheRF-controlsy
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