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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Maximum Average <strong>Beam</strong> Current ( A)<br />
10 4<br />
5<br />
2<br />
C foil<br />
Al foil<br />
Au foil<br />
10 -1<br />
2 5 10 0<br />
2 5 10 1<br />
2<br />
Equivalent <strong>Beam</strong> Size (rx ry) 1/2 10<br />
5<br />
2<br />
(mm)<br />
2<br />
10<br />
5<br />
2<br />
3<br />
Figure4.3:Maximumaveragecurrentthatcanwithst<strong>and</strong>aTRradiatorasafunctionofthe equivalentbeamradius.ThreetypesofTRradiatorhavebeenconsidered:Aluminum,Gold<strong>and</strong> Carbon.Thethreeradiatorare0:8mthick. Experiment WehaveperformedanexperimentintheCEBAFinjectorat45MeVtostudyscatteringeect asthebeampassthroughaluminumfoilofdierentthickness.Theexperimentalsetupisas scannerhasthreewires(seeg.4.1b)thatrespectively(fromrighttoleftinthegure)givesthe beamprolealongthehorizontal,vertical<strong>and</strong>45degaxes.Thefactthatthebeamsizeinthe prolemeasurementstation:awire-scanner.Allthequadrupole<strong>and</strong>correctormagnetsbetween thefoils<strong>and</strong>thewirescannerareturnedo.Ingure4.5wecomparetwotypicalwirescanner tracesobtainedwith<strong>and</strong>withouta0:8maluminumfoilinsertedinthebeampath.Thewire follow:dierentaluminumfoilaremountedonasupport,<strong>and</strong>canbeinsertedintothebeampath remotely.Thescatteredbeamthendriftsthroughalengthof7:43muptoatransversebeam horizontaldirectionismuchsmallerthantheverticaldirectiononeissimplyduetotheopticstune upstream.Asonecanexpectthebeamproleislargerasthe0:8mfoilisinserted.Moregenerally itgetswiderasthefoilthicknessincreases.Forquantitativeanalysisofthescattering,weonly theconvolutionofthebeamproleBwiththefoil\scatteringtransferfunction"T(orscattering<br />
considerthetailofthebeamprolelocatedontherightsideofthehorizontalprole(rightpeak) becausetheotherpeaksoverlap<strong>and</strong>wouldyieldatediousdeconvolution.Wealsoassumethatwe havescanned100%ofthebeam.LetS()bethefunctionassociatedtothetail.S()isindeed
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