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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50<br />
Figure6.6:SteeringeectduetoFP<strong>and</strong>HOMcouplerinthecryounitversus,thephase<br />
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surementswithnumericalsimulations<strong>and</strong>attempttoexplainpotentialdiscrepancies<strong>and</strong>trytoelectromagneticbeampositionmonitor.Therefore,wecantrytocomparetheexperimentalmea- dierencew.r.t.themaximumenergyphase(so-called\crestphase"). renethemodeltoincorporatetheeectsthatmayaccountforthesediscrepancies.<br />
-50<br />
hor.<br />
ver.<br />
Transverse<strong>Beam</strong>Properties<br />
-100<br />
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(RF-deg)<br />
themultislitsmaskrevealedemittance70%largerthansimulated.Manyparametricstudieswhere conductedtodetermineifthisemittancegrowthcouldbeminimizedbyuseofavailableparameters: themagneticeldintherst<strong>and</strong>secondsolenoids,<strong>and</strong>thebunchergradient.Mostofoureort Asarstqualitativeobservation,wemeasuredbeamdensityproleontheOTRdensitymonitor beamdensityisshowningure6.7.Thebeamshapearequitesimilar,<strong>and</strong>rmsvalueareinagreementatthe30%level:simu locatedjustdownstreamtheacceleratingstructure.Acomparisonofthemeasured<strong>and</strong>expected<br />
adjustbecauseitalsoaectthebunchingscheme<strong>and</strong>someotheradjustment(acceleratingcavities <strong>and</strong>phasesalongthelinac)arethenneededtopreserveanultrashortbunchlengthinthemain concentratedonthesolenoidlenses<strong>and</strong>thebunchergradient,alsothislatterknobisdicultto rstmeasurementsoftransverseemittancebasedonthephasespacesamplingmethodutilizing x'simu y=1:47mm,<strong>and</strong>exp x=1:77,<strong>and</strong>exp y=1:60mm.However<br />
linacattheundulatorlocation.Anexampleofparametricstudyofthetransverseemittanceversus the\emittance"solenoidmagneticeldispresentedingure6.8.Thisgureclearlyrevealsthe injectoremittancesaredegradedcomparedtotheonepredictedvianumericalmodeling.Onehypotheticexplanationofsuchadisagreementisathemisalignmentofthecryounitwithrespecttothe Angular kick (rad)<br />
Cav #4<br />
Cav #3<br />
100<br />
Equivalent Dipole Strength (G.cm)
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