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

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Time of Flight out (RF-deg)<br />

Drive Laser Phase in (RF-deg)<br />

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-5.0 -2.5 0.0 2.5 5.0<br />

-40<br />

-20<br />

0<br />

20<br />

40<br />

Figure3.15:Comparisonofthephase-phasebeamtransferfunctionbetweenthephotocathode<br />

surface<strong>and</strong>thethreedierentpickupcavities(pickup#2,#3,<strong>and</strong>#4)(bottomrow)withthe<br />

onesimulatedusingparmela(toprow).<br />

bothexperimentally<strong>and</strong>inthemodelwhenwetrytoperformaperturbation-typemeasurement.<br />

Thisalsosuggestthatthesame\dierenceorbit"techniqueweuseforthetransverseplanecould<br />

beperformedinthepresentcase,ifthemotivationwasnottoextractmatrixelements.<br />

EectsoftheFELonthePhase-Phasemap<br />

AssessingtheeectoftheFELonthebeamhasbeenstudiedonlyexperimentally.Wewillattempt<br />

toprovideaqualitativeexplanation.Inthisexperimentwehavesetthelaserphasemodulation<br />

amplitudeto40deg,sinceitcorrespondsthefullbunchlengthatthecathodesurface.Firstlywe<br />

preventedthelasertorunbydetuningtheopticalcavity<strong>and</strong>recordedthephase-phasetransfer<br />

function.Thenwetunedtheopticalcavity,i.e.adjustthelengthtomatchthetimeofight<br />

ofelectronbunchesinsidethecavity,<strong>and</strong>recordedthephase-phasetransfermap.Theother

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