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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Horizontal Dispersion (m)<br />
Arc 1 ‘‘back−leg’’<br />
extr. chic.<br />
Arc 2<br />
−1<br />
20<br />
Figure3.2:HorizontalDispersion(topgraph)<strong>and</strong>transversebetatronfunctions(bottomgraph)<br />
βx 15<br />
βy 10<br />
manyfactorsthatcancausetherealmachinetobedierentfromthenumericalmodel.Amongthe forthenominalsettingsofthemagneticoptics.<br />
5<br />
causesofthesediscrepancies,themostusualarealignmenterrors,magnetdisfunctions,etc...Hence itisofprimeimportance,intherstphaseofcommissioningoftheaccelerator,todiagnosethese defects<strong>and</strong>potentiallyxorunderst<strong>and</strong>themtomatchascloseaspossiblethenumericalmodel Thoughthedriver-acceleratordesignisessentiallyspeciedvianumericalsimulations,thereare 3.3MeasurementoftheTransverseResponse<br />
0<br />
0 20 40 60 80 100<br />
tothe\asbuilt"accelerator.Inthissectionwereportonmeasurementofthetransverselattice<br />
Distance From Cryomodule Exit (m)<br />
responseofthedriveracceleratoralongtherecirculator.Inthisreport,wehaveonlyconcentrated ontwotypesofmeasurements:(1)trytoverifythattherstordertransfermatrixusedinthe modelisclosetothemachine,(2)measurepreciselythedispersion(i.e.thetransverseposition dependenceonenergy)functionintheback-legtransferline.<br />
Betatron Functions (m)<br />
2<br />
1<br />
0<br />
Compressor<br />
Undulator<br />
Decompressor<br />
reinj chic.
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