High Brightness Electron Beam Diagnostics and their ... - CASA
High Brightness Electron Beam Diagnostics and their ... - CASA High Brightness Electron Beam Diagnostics and their ... - CASA
wetriedtoperformedthemeasurements.Howeverapreliminaryconclusionwouldindicatethat CSRisnotasignicanteectintheIRFEL,inthesensethatnotremendousgrowthofthe 6.5.3Conclusion thefuture,oncethebeamdynamicsinthemachineisfullyoptimized,oneshouldtrytotransport transverseemittanceortheenergyspreadwasobservedevenat60pC.Onlyonemeasurementhas beenperformedandtheremightbeopticallatticesetupsthatmayprovidealargerenergyspread andemittancegrowth.AtminimumwecanconcludethatwiththenominalsetupoftheIRFEL OurexperimentonCSRwasnotverysuccessfulbecauseofbadbeamqualityduringtheperiod highercharge(e.g.thefull135pCrequiredfortheUpgradeIRFEL),andattempttogenerateand measurebeamdegradationduetobends. acceleratorneithersignicantemittancedilutionnorenergyspreadgenerationweremeasured.In
Conclusion Chapter7 Therecirculatortransverseresponsefunctions,thelatticedispersion,andthelongitudinaltransfer Theworkpresentedinthepresentreportdescribesindetailtheimplementationofdierenttypesof functionsR56andR55(alongwithnonlinearities)havebeenmeasuredandcomparedwithamag- commissioning,understandingandoperatingthersthighaveragepower(kW-level)infra-redfree electronlaseroscillatorthathasbeenbuiltatThomasJeersonNationalAcceleratorFacility. diagnosticsforarelativelyhighbrightnesselectronbeamandtheapplicationsofthesediagnostics tostudysomebeamdynamicsproblems.Thisworkhadasignicantcontributioninthesuccessof neticopticscodesuchasdimadandparticlepushingcodesuchasparmela. Wehaveimplementedtwotransversephasespacecharacterizationtechniquestostudythephase theemittancedominatedregime.Theformertechniquebasedontransversephasespacesampling usingamultislitmaskhasallowedsomepreliminaryparametricstudiesofthephasespaceof60pC chargeperbunchbeamproducedatthefrontendofa10MeVphotoinjectorandhasbeencapable toresolveemittanceaslowas1mm-mradinatestinjectorstand. Alongwiththetransversephasespace,afullsix-dimensionalcharacterizationofthephasespacehas spacedensityoftheelectronbeamasitisstillinthespace-chargedominatedregime,butalsoin coherenttransitionradiationproducedbythebunchedelectronbeam.Thisinterferometerhasalso beenusedtoperformparametricstudyofthebunchlengthevolutionversussomeradio-frequency elementthatplayakeyroleinthebunchingscheme. FinallyafullmodelbasedonmultiparticlesimulationoftheIRFELhasbeenelaboratedandcom- beenattemptedbymeasuringbothbunchlengthandenergyspreadoftheelectronbeam.Because paredwhenpossiblewithexperiments.Atentativeexperimenttomeasureenergyspreadgeneration oftheultra-shortbeamrequiredtodriveafree-electronlaser(typically
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wetriedtoperformedthemeasurements.Howeverapreliminaryconclusionwouldindicatethat CSRisnotasignicanteectintheIRFEL,inthesensethatnotremendousgrowthofthe 6.5.3Conclusion<br />
thefuture,oncethebeamdynamicsinthemachineisfullyoptimized,oneshouldtrytotransport transverseemittanceortheenergyspreadwasobservedevenat60pC.Onlyonemeasurementhas beenperformed<strong>and</strong>theremightbeopticallatticesetupsthatmayprovidealargerenergyspread <strong>and</strong>emittancegrowth.AtminimumwecanconcludethatwiththenominalsetupoftheIRFEL OurexperimentonCSRwasnotverysuccessfulbecauseofbadbeamqualityduringtheperiod<br />
highercharge(e.g.thefull135pCrequiredfortheUpgradeIRFEL),<strong>and</strong>attempttogenerate<strong>and</strong> measurebeamdegradationduetobends.<br />
acceleratorneithersignicantemittancedilutionnorenergyspreadgenerationweremeasured.In
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