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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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 />
Pickup #2<br />
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-5.0 -2.5 0.0 2.5 5.0<br />
-40<br />
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20<br />
40<br />
Pickup #3<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 />
Pickup #4<br />
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-5.0 -2.5 0.0 2.5 5.0<br />
-40<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