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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concentrateonthebeamparametersintheundulatorvicinity,whichareofimportancetostartup oftheFELprocess<strong>and</strong>quantifyfewofitsproperties. Thebeamdynamicsintherecirculationwillbedescribedlater.Inthepresentchapterweonly 9.Thebeamisthenrecirculated.<br />
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(D) (E) (F)<br />
longitudinalphasespaceisplottedattheexitofthegun(A),thebuncher(B),theSRF-cavity#1 (C),theSRF-cavity#2(D),theachromaticchicane(E),theSRF-linac(F),thebunchcompressor chicane(G),thebunchdecompressorchicane(H),thearc#1(I).Notethatelectronswithpositive Figure5.1:SequencesofparmelarunsdemonstratingthebunchingprocessintheIRFEL.The<br />
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WepresentedinChapter2theformalismassociatedtotheemissionofelectromagneticwaves 5.3TheoryofBunchLengthMeasurementusingFrequencyDomain belongtothebunchtailwhiletheonewithnegativeareinthebunchhead.<br />
(RF-deg.)<br />
possiblefromthelattertoextractinformationonthelongitudinalbunchdistribution.<br />
namedthespatial<strong>and</strong>angularBFF.InthenextsectionwestudybothBFFs<strong>and</strong>showhowitis (d2P=(d!d))bysuchsystemhasacontributionthatisproportionaltoN2,whereNisthe byamulti-particledistribution.Wehaveseenthatthetotalspectralangularpoweremitted calledbunchformfactor(BFF)f(!;bn)thatinturncanbewrittenastheproductoftwofactors numberofelectronsinthemulti-particlesystem.Thiscontributionisalsoproportionaltotheso<br />
E (keV)<br />
E (keV)<br />
(A) (B) (C)