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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6.10Comparisonofthermstransversehorizontalbeamsizemeasuredinthehighdisper- 6.11\R55"transfermapgeneratedwithparmelafor(1)dierentcavitymodel(3Dmaa 6.12\R55"transfermapfordierentexperimentaloperatingpointsofthebunchergrasionOTRmonitorwiththeoneexpectedfromparmela................149 numericalsimulations.(Firstseriesofmeasurement)..................151 dient.Themeasurementsarealsocomparedwiththe\ideal"injectordevisedfrom thecasewherethepickupcavityislocateddownstreamthecryounitafteradriftin adispersion-freeregion...................................150 <strong>and</strong>2Dsupersh)atthepickupcavitylocatedintheinjectionchicane<strong>and</strong>(2)for<br />
6.13ComparisonofthemeasuredR55patternaftertheFELwasoptimizedwiththe 6.14rmsbunchlengthevolutionalongtheIRFELfromthephotocathodeuptotheexit 6.15Variationofthebunchlengthversusthelinacacceleratingphaseperparmelasim- \ideal"R55patterngeneratedwithparmela(usingthesecondsetup).........152 ofthesecondchicane....................................153<br />
6.16Phasespacedistortionduetochromaticaberrationatthedecompressorchicaneexit (topplots)<strong>and</strong>thearc1exit(bottomplots).......................156 coveredfromtheCTRautocorrelationusingthetechniquementionedinChapter5]. Comparisonbetweentheexperimental<strong>and</strong>simulatedbunchlongitudinaldistribution (C).TotalCTRpowersignalmeasuredduringplot(B)experiment(D).......154 ulation(A)<strong>and</strong>measured(B)["measured"meansthebunchdistributionwasre<br />
6.17Emittancegrowthduetochromaticaberrationversusthemomentumspread<strong>and</strong> 6.19SchematicsofCSRselfinteractionofabunch.......................160 6.18Evolutionofbeamparameters(bunchlengthz,rmsenergyspreadE,transverse emittances~"x;y,<strong>and</strong>rmsbeamsizesx;y)versustheoperatingacceleratingphaseof thelinac...........................................158 energyosetofthebeam..................................157<br />
6.20AnalyticalcomputationforCSR-inducedenergylossalongagaussianbunch<strong>and</strong> 6.21TransverseHorizontalemittance<strong>and</strong>totalpowerCTRsignalmeasuredasafunction 6.22Energydistributionmeasuredalongthebeamline,atthechicanemidpoint(A)<strong>and</strong> chicane(macroparticlewith>0areinthebunchtail)................161 predictionusingasimplenumericalmodelinamodiedversionofthescparmela codefor200m(A)<strong>and</strong>100m(B).Thesystemconsideredisasimpleachromatic ofthelinacgangphase...................................162 (B)<strong>and</strong>entranceofthearcs(C)<strong>and</strong>(D)[thehorizontalaxisoftheseplotrepresent therelativeenergyspread(nounits)].Thebottomplotpresentsthermsrelative energyspreadcomputedfromthedistributions......................163
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