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

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tioned.FromthetransferfunctioninFig.3.15wecandeducedbyperformingnon-lineart,an 40 Photcathode Drive Laser Phase (RF−deg) 20 Figure3.14:phase-phasebeamtransferfunctionbetweenthephotocathodesurfaceandthethree pickup #2 dierentpickupcavities:pickup#2,#3,and#4. 0 pickup #3 pickup #4 estimateofthetransfermatrixelementtheresultsofthenon-lineartaregatheredinTable3.4.5. Themeasurementofthelinearpartareinverygoodagreementwiththesimulationexceptfor −20 −40 −2 0 2 4 Wehaveexperimentallyinvestigatedtheeectsofthesecondfamilytrimquadrupolesonthe thecavity#4,webelievethediscrepancycomesfromabadcenteringoftheelectronbeamonthe magneticaxisofthetrimquadrupolesandsextupolesinthearc2. EectsoftheQuadrupoles Time of Flight (RF−deg) totheirnominalvalues.Thenweiteratethemeasurementforboththetrimquadrupolesturnedo andwiththeirvalueoppositetonominal.Themeasurementsaregathered3.16(A).Sincenotime wasspenttore-measurethetransfermapalongthelinacanditeratethesameprocedureasbefore, i.e.setthemodelsuchthatthesametransfermapisachievedatthelinacexit,andthenusethe measurementwehavemeasuredthebeamphase-phasecorrelationwiththetrimquadrupolesset fordierentcases.Thestudyhasonlybeencarriedoutusingthepickupcavity#3.Forsuch modeltopredictthechangeatcavities#3and#4,thedisagreementisquiteimportant.However, phase-phasetransfermap.Ingure3.16wepresentmeasurementofthephase-phasecorrelation ifwelookatwhatistherelativechange,i.e.bycalculatingthedierencehoutjiniQuadSettings houtjiniNominalSettingsforboththeexperiment(seeg.3.16(C))andthenumericalmodel(see toextractquantitativenumberforR55andT555,itshowsthatthismapdoesevolvethesameway g.3.16(D))theagreementissatisfactory.Thoughinthepresentcasethemethoddoesnotallow
Time of Flight out (RF-deg) Drive Laser Phase in (RF-deg) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . .. . . . ... . . . . . .. . .. . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . .. . . . .. . . . . . . . . . . . -5.0 -2.5 0.0 2.5 5.0 -40 -20 0 20 40 Pickup #2 . . . . ... . . . . . . . . . ... . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . .. . . . . .. . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . .. . . . .. . . . .. . . . . . . . . .. . .. . .. . .. . . . -5.0 -2.5 0.0 2.5 5.0 -40 -20 0 20 40 Pickup #3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . .. . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -5.0 -2.5 0.0 2.5 5.0 -40 -20 0 20 40 Pickup #4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . -5.0 -2.5 0.0 2.5 5.0 -40 -20 0 20 40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . -5.0 -2.5 0.0 2.5 5.0 -40 -20 0 20 40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . -5.0 -2.5 0.0 2.5 5.0 -40 -20 0 20 40 Figure3.15:Comparisonofthephase-phasebeamtransferfunctionbetweenthephotocathode surfaceandthethreedierentpickupcavities(pickup#2,#3,and#4)(bottomrow)withthe onesimulatedusingparmela(toprow). bothexperimentallyandinthemodelwhenwetrytoperformaperturbation-typemeasurement. Thisalsosuggestthatthesame\dierenceorbit"techniqueweuseforthetransverseplanecould beperformedinthepresentcase,ifthemotivationwasnottoextractmatrixelements. EectsoftheFELonthePhase-Phasemap AssessingtheeectoftheFELonthebeamhasbeenstudiedonlyexperimentally.Wewillattempt toprovideaqualitativeexplanation.Inthisexperimentwehavesetthelaserphasemodulation amplitudeto40deg,sinceitcorrespondsthefullbunchlengthatthecathodesurface.Firstlywe preventedthelasertorunbydetuningtheopticalcavityandrecordedthephase-phasetransfer function.Thenwetunedtheopticalcavity,i.e.adjustthelengthtomatchthetimeofight ofelectronbunchesinsidethecavity,andrecordedthephase-phasetransfermap.Theother
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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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Page 13 and 14: ListofFigures 1.1Comparisonoftheexp
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Page 17 and 18: 4.18Overviewofthephasespacesampling
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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
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Population Population 100000 90000
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Theequation5.8yields: f()=jZ+1 11Xn
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presentanoutlineofthisproofbelow,an
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contrastintheCEBAFmachine,varyingas
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1.5 1 correspondtothevarianceofveco
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Ε’ 2 B Mirror M 2 Ε2 Polarizer
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FinallyitisinterestingtonotethatFou
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Itsautocorrelationis:S(z)=8>:(1=w2)
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drivelaserwhereasin(A),suchoperatio
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expansionoftheBFFderivedinthischapt
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Asarstapproximation,wecanestimatetr
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errorpropagation8theoryappliedonEqn
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inducedbyspacechargeisnotaconcernin
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Golay Cell Signal (V) Golay Cell Si
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Golay Cell Ouput (V) Golay Cell Oup
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150 100 5 4 Figure5.19:Energyspectr
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Figure5.23:picturaleectoflongitudin
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. .. .. . .. . . .. . .. . . .. . .
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σ x (m) x 10−3 5 4 3 2 1 0 0 5 1
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BeamDynamicsStudies Chapter6 undula
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x,y (mm) 6.0 4.8 3.6 2.4 1.2 x y 0.
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Space Charge over Emittance Ratio (
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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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