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

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Vertical axis (arbitrary units) 100 150 200 250 300 350 100 200 300 400 100 150 (D) 100 (A) (B) (C) 150 200 250 300 350 100 200 300 400 100 150 100 150 200 250 300 350 100 200 300 400 200 200 200 250 250 250 Figure6.9:BeamdensitymeasuredonthehighdispersionOTRmonitorforninedierentbunch 300 300 300 350 350 350 100 200 300 400 100 200 300 400 100 200 300 400 100 100 100 (G) (H) (I) 150 150 150 200 200 200 250 250 250 thereisnotsignicantdierencebetweenthegeneratedtransfermapsexceptsomebroadeningin fromthelowgradientvalues) theCEBAFcavity:a3Dmafiamodel(whichincludesthecoupler-inducedeects)anda2Dcylindricalsymmetricsuperfishmodel.Theresultsarepresentedingure6.11,whichshowsthat gradientsettings(theimages(A)to(I)correspondstothepointspresenteding.6.10starting 300 300 300 350 350 350 100 200 300 400 100 200 300 400 100 200 300 400 thecavitywaslocateddownstreamthecryounitafteradriftofsimilarlengthtoitspresentlocation intheinjectorchicane;sincethecalculationcorrespondstoadispersion-freedrift,thistransfermap givesinsightsontheeectsoftheRFintheaboveequation.Wecanclearlyobservethatthis tocouplers).Inthesamegurewealsocomparethephase-phasecorrelationpatterngeneratedif thecasetheofthemapgeneratedfromthe3Dmafiamodel(whichincorporatestheRF-kickdue Horizontal axis (arbitrary units) eectdoesnotwashouttheTOFvariationduetoenergychanges;smalleectsareobservable Anapplicationofthistypeofmeasurementwastondtheproperoperatingpointofthebuncher accelerator[22]thatconsistsofcomparingthephase-phasepatternexperimentallymeasuredwith onenumericallygeneratedforanidealsetup. inChapter3).Infact,wecanuseasimilartechniquetotheonealreadyinuseintheCEBAF onlyforlargephotocathodedrivelaserphase.Despitethefactthattheeectissmall,itprevents usfromextractingquantitativeinformationfromthemap(i.e.byperformingnonlineartsas 100 (E) (F) 150
2.2 2 1.8 Figure6.10:Comparisonofthermstransversehorizontalbeamsizemeasuredinthehighdispersion 1.6 OTRmonitorwiththeoneexpectedfromparmela. 1.4 1.2 PARMELA 1 0.8 theinjectorfrontendmatchedtheexperimentallyestimatedkineticenergyof9.56MeV(inferred cavityelectriceld:devisinga\good"bunchingschemeintheinjectorisathreeparametersprob- 0.1 0.2 0.3 0.4 0.5 fromthestrengthoftheinjectionchicanedipoles);duringthesimulationsthecavity#4wasset werenotpreciselycalibrated).Sincethecavity'scontrolelectronicsandsoftwareareidentical,and becausecavity#4isoperatedatagradient30%higherthancavity#3,weestimatedthegradient withthehelpofparmela:usingthiscodewehavevariedthegradientofthetwocryounitcavities (keepingcavity#4atagradient1.3timeshigherthancavity#3)untilthesimulatedenergyat thebuncher,cavity#4,andcavity#3gradients(atthetimeofthemeasurementtheirgradients lemwithonepossiblemeasurement:thephase-phasecorrelationpattern.Thethreeunknownsare Buncher Gradient (MV/m) modelishenceforthtermedas\ideal"injector. Firstseriesofmeasurementsperformed pointsatthattime).Thebuncherwasoperatedatagradientof0.32MV/m.Theso-generated tooperateoncrestwhilethecavity#3was-20dego-cresttoreecttheexperimentaloperating gunchamberwhichinturnwillremovethecesiumfromthephotocathodewafer. Wehaveinvestigatedthebunchereectonthe320kVgunsetup5aftertheinjectorRF-phases alongwiththepatterngeneratedwithparmelafortheidealinjector.Fromthisgurewedecided wereproperlyreset.TheoptimizedphasearegatheredinTable6.1.4.Thebunchergradientwas initiallysetto0.28MV/m,andweinvestigatedtheeectonthe\R55"transfermappatternby systematicallyvaryingthebunchergradient.Therecordedpatternsarepresentedingure6.12 5Atthetimeofthepresentexperimentwewerelimitedtothisvoltage;highervoltagewouldinducearcinginthe σ x (mm) MEASUREMENT
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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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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
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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)
Page 137 and 138: drivelaserwhereasin(A),suchoperatio
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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
Page 155 and 156: . .. .. . .. . . .. . .. . . .. . .
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
Page 161 and 162: x,y (mm) 6.0 4.8 3.6 2.4 1.2 x y 0.
Page 163 and 164: Space Charge over Emittance Ratio (
Page 165 and 166: numericalsolution[56].Thisapproxima
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Page 169: ε x (mm−mrad) Nominal 6 4 2 cryo
Page 173 and 174: 6 4 2 Figure6.12:\R55"transfermapfo
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Page 177 and 178: EnergySpread(%) BunchLength(mm) Par
Page 179 and 180: 15 Effect of RMS energy Spread 10 F
Page 181 and 182: 6.4.4BunchSelfInteractionviaCoheren
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Page 185 and 186: Inthesecondseriesofrun,wewereableto
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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High Brightness Electron Beam Diagnostics and their ... - CASA

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