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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180<br />
8<br />
160<br />
6<br />
Figure4.22:Anexampleof2Dbeamdistributionontheanalyzerscreendownstreamthemultislit<br />
4<br />
140<br />
mask.Theprojectionontothex-axisisalsodisplayed.<br />
2<br />
120<br />
0<br />
100<br />
−2<br />
80<br />
−4<br />
60<br />
−6<br />
40<br />
Table4.8:Comparisonofthermstransverseemittancemeasurementperformedwiththemultislits ~"x(mm-mrad)~"x(mm-mrad) Dierence(%)<br />
−8<br />
<strong>and</strong>theone-slit<strong>and</strong>one-harptechniques. 0.4669 0.5607 0.5594 multislitmethodone-slit-oneharpmethod 0.5071 0.5070 0.4859 811<br />
15<br />
−10<br />
20<br />
−5 −4 −3 −2 −1 0 1 2 3 4 5<br />
x (mm)<br />
MeasurementofEmittanceintheInjectorTestSt<strong>and</strong> Wethenvariedthesolenoidstrengthfrom237:5Gupto307:5Gtoseehowwasevolvingthe around280G(seeFig.4.24)asobservedinnumericalsimulation.The-functionpresentsas emittancevaluefordierentsettingsoftherstsolenoid.Theemittancepresentsagapatvalues<br />
Chapter1).Thenumberofproducedelectronsdependsontheselectedwidthforthemacropulse.<br />
thenumberofphotonwasstillhighenoughtoproducedunwantedelectrons(seeourcommentin theoutputoftheswitchwhenitiscloseoropen)wasnotoptimized<strong>and</strong>thenevenwhenclosed, factthiswasduetoproblemwiththeopticalswitchofthephotocathodelaseryieldingalightleak creatinglowemittance\ghostpulses":extinctionratio(ratiobetweentheintensityofthelightat expectedaminimumcorrespondingtothebeamwaist.Chargewasvariedusingthelaserattenuator <strong>and</strong>thebunchchargewasmeasuredusingabeamdumpedequippedwithaFaradaycup.Asitcan beseeningure4.25below,theemittancewasfoundtobedependentonthemacropulsewidth.In<br />
y (mm)<br />
10
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