High Brightness Electron Beam Diagnostics and their ... - CASA
High Brightness Electron Beam Diagnostics and their ... - CASA
High Brightness Electron Beam Diagnostics and their ... - CASA
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3.11Momentumcompaction<strong>and</strong>nonlinearmomentumcompactionforonearcversusthe 3.10Energycompressionscheme:Therstrow(fromlefttoright)presentsthelongitu- Theresultforthethreecasesafterdecelerationareshowninthethirdrow......35 dinalphasespaceatthelinacexit,afterthecompressionchicane,<strong>and</strong>justafterthe wigglerinteractionhastakenplace;thesecondrowshowlongitudinalphasespaceat theentranceofthelinacjustpriortodecelerationforthreedierentchoiceofR56 secondfamilyoftrimquadrupolesexcitationstrength(kq).nonlinearmomentum <strong>and</strong>T556(for(A)-0.2<strong>and</strong>0.m,for(B)0.2<strong>and</strong>0m<strong>and</strong>for(C)0.2<strong>and</strong>3.0m).<br />
3.12LocationofthepickupcavitiesalongthetransportlineintheFELdriveraccelerator.38 3.13BlockdiagramofthecompressioneciencyR55<strong>and</strong>momentumcompactionR56 compactionversusthesecondfamilysextupolesstrengthks(forthiscalculation,the<br />
3.14phase-phasebeamtransferfunctionbetweenthephotocathodesurface<strong>and</strong>thethree trimquadrupolesareunexcited)..............................36 measurement.........................................39<br />
3.16Demonstrationoflongitudinaldierence-orbit:phase-phasetransfermapmeasured 3.15Comparisonofthephase-phasebeamtransferfunctionbetweenthephotocathode (A)<strong>and</strong>simulated(B)forthreedierentsettingsofthetrimquadrupole.Plot(C) row)withtheonesimulatedusingparmela(toprow)................41 surface<strong>and</strong>thethreedierentpickupcavities(pickup#2,#3,<strong>and</strong>#4)(bottom dierentpickupcavities:pickup#2,#3,<strong>and</strong>#4.....................40<br />
3.17Phase-phasetransferfunctionsfordierentsettingsoftheopticalcavitylength.In respectivelytheexperiment<strong>and</strong>thesimulation......................43 (A)theopticalcavityiscompletelydetunedsothatthelaserdoesnotoperate.In <strong>and</strong>(D)correspondtodierenceofthemeasuredmappresentedinthetoprawfor<br />
3.18EvolutionoftheR56alongthebeamtransportintherecirculationtransport,from thelinacexittoarc3Fexit.MeasuredR56arealsopresentedaslledsquares....47 thephase-phasetransfermapismeasuredfordierentdetuningoftheopticalcavity case(B)<strong>and</strong>(E)......................................46 cavityistunedsothatthelaseroperateatthelimitofitsturno.In(C)<strong>and</strong>(D), (B)thecavityispreciselytunedtomaximizetheFELoutputpower.In(E)the<br />
3.19Comparisonofthelineartermextractedbyttingthemeasuredenergy-phasetrans-<br />
4.1Schematicsofprincipleforthedierenttypeofbeamproledensitymeasurement 3.20EectofthesextupolesintheArc3Fontheenergy-phasecorrelation.(Simulations <strong>and</strong>experimentaldataareosetforclarity)........................48 fermapwiththeexpectedmomentumcompactionR56fromthedimadcode,for<br />
devices............................................54<br />
dierenttrimquadrupolessettings.............................47
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