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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5<br />
2<br />
2 3 4 5 6 7 8 9 10 0<br />
10<br />
5<br />
2<br />
Foil Thickness ( m)<br />
-1<br />
10<br />
5<br />
2<br />
0<br />
Keil 70%<br />
Geant 70%<br />
Figure4.7:ComparativeresultsofexperimentwithKeil'ssemi-empiricaltheory<strong>and</strong>geantcom-<br />
Meas 95%<br />
putationforthinaluminumfoils.<br />
Meas 70%<br />
distributionforcarbon.Ingure4.8wepresenttheprojectedscatteringangle(normalizedtothe energy)containing70%,95%<strong>and</strong>99.5%ofthebeamversusthemeannumberofcollisionforin thecaseofrelativisticelectrontraversingverythinfoils.Usingthisplots<strong>and</strong>knowingthemachine dynamicsacceptance,wecancomputethefractionofthebeamwecanloseasthefoilisinserted intothebeampath.<br />
transferlinestooneofthenuclearphysicsexperimentalendstation. beamprole.TheexperimentwasperformedintheCEBAFaccelerator<strong>and</strong>locatedinoneofthe Inanattempttocheckourpreviousestimationswehavedevelopedaprototypeformeasuring 4.3.1Anon-interceptiveTRbeamprolemonitor<br />
Experimentalsetup ThebackwardTRdependsonthereectioncharacteristicsofthesurface.Thereareseveralproblemsthatarisewithverythinfoils:surfaceinhomogeneitymakes<strong>their</strong>coecientofreection nonuniform,<strong>and</strong>itisalsodiculttostretchthemenoughtoobtainaveryatsurface.These<br />
(mrad)<br />
Keil 95%<br />
Geant 95%
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