High Brightness Electron Beam Diagnostics and their ... - CASA

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Actuator Inserts Foil and Mirror CID Camera 10000 9500 Lens 9000 8500 Lens 8000 4200 4400 4600 4800 5000 5200 5400 5600 5800 6000 6200 x (µm) e- ~ 1 mm (full width) atypicalbeamdensitymeasuredwithsuchdevice(B). Figure4.9:OverviewofthecarbonfoilbasedOTRexperiment(CourtesyfromS.Spata)(A)and damaged,aspredictedbyourthermalstudies. Ongure4.9(B)weshowtypicalmeasuredbeamdensity.Thebeamsize(deneastherms Transition Radiation rmsbeamsizewiththeoneobtainedusingthewirescannerincloseproximityandobtainedthe Mirror samebeamwidthwithintheuncertaintytoleranceasshowninTable4.3.1. Horizontal axis Carbon Foil Beam TothebestofourknowledgethisisthersttimeTRwasusedtomeasuredbeamsizeofhundredsof compatiblewiththeoneexpectedusingthemagneticopticscodeDIMAD.Wealsocomparethese value),obtainedperforminganonlineartofthetransverseproleswithaGaussiandistribution, are255mand130mforrespectivelythehorizontalandverticaldirections.Thesevaluesare (A) (B) FORWARD OTR MONITOR resolutionthathadbeenclaimedwasthatforagivenreducedenergytheminimumrmsbeamsize thatcouldberesolvedbydetectingTRatthewavelengthisoftheorderoftheproduct=(4). beusetomeasuremicron-sizedbeamprolesforrelativisticbeams.Thehypotheticallimitin ofacommonargumentinthebeaminstrumentationcommunityaccordingtowhichTRcannot micronsforanultrarelativisticbeam('6300).Thismeasurementistheproofofthenonvalidity Inourcasesuchcriterionwouldset,atawavelengthofobservationof500m,thesmallestrms thesmallestbeamsizewemeasured.ResolutionissuesconcerningOTRhavebeendiscussedin beamsizewecouldobservedtoapproximately250mrms,i.e.approximately2timeslargerthan toSR,isnotcollimatedwithina1=-cone:forinstancetheTRemissionassociatedwitha1GeV numerouspaper[33].Inbrief,theaforementionedcriterionconcerningtheminimumrmsbeamsize sourceanditsextentareboundedbytherelation0>=(4).InthecaseofTR,thecommon mistakeistowrite0'1=whichnallyyieldtotherelation0
ofP.Gueye,HamptonUniversity,VAUSA). spectrometerwith(A)andwithout(B)thebeambeinginterceptedbythecarbonfoil(Courtesy Figure4.10:ComparisonoftheMissingmassspectraobtainedusingoneoftheexperimentalhall Table4.3:ComparisonoftheprolemeasurementswiththewirescannerandOTR-monitor. Simulation0:250mm OTR-monitor0:2550:060mm0:1300:060mm wirescanner0:2040:050mm0:0820:050mm horizontaldirectionverticaldirection 0:114mm (A) (B) incomingelectronbeamthathitsthetarget,thispeaksasanonzerowidth.Onestraightforward experimentwiththecarbonfoilistodetermineifthefactofinsertingthecarbonfoilinthe lookatthemissingmassspectrum.Inthismissingmassspectrum,wehaveapeakcenteredon theprotonmass(945MeV=c).Duetotheniteresolutionofthedetector,theemittanceofthe todeterminewhetherthefoilhassignicantimpactonthenuclearphysicsmeasurementwasto Namelywewereobservingthereactione+p!e0+p0intheelasticscattering.Acriterion observetherecoilelectronissuedfromthescatteringoftheelectronbeamonahydrogentarget. accelerator.Theexperimentconsistedofsettingtheangleandthedipolesofthespectrometerto 800MeV,theprototypewebuiltconstitutesanoninvasivebeamprolemonitor. theelasticpeakwassimilarwellwithinexperimentalnoise.Thismeasurementwereperformedat 3GeV.LatterincollaborationwithanotherexperimentalHall,thesimilarexperimentwasiterated atlowerenergy800MeVyieldingasimilarconclusion.Therefore,atleastatenergyhigherthan foil.Figure4.10showsthemissingmassspectrainthetwocases.Inbothcases,thermswidthof datawiththespectrometerwhileinasecondsetdatawereacquiredwithoutinsertingthecarbon measurementswereperformed:InarstoneweinsertedthecarbonTRradiatorandacquired beampathdownstreamthetargetyieldanenlargementofthepeakwidth.Hencetwosetsof
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HighBrightnessElectronBeamDiagnosti
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eratedupto48MeVpriortothelasingsyst
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IthanktheCEBAFmachineoperators,with
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3.4MeasurementoftheLongitudinalResp
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5.6ZerophasingTechniqueforBunchLeng
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ListofTables 3.2Comparisonofcoecien
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ListofFigures 1.1Comparisonoftheexp
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3.11Momentumcompactionandnonlinearm
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4.18Overviewofthephasespacesampling
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5.16Interferogrammeasuredfordierent
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6.10Comparisonofthermstransversehor
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Chapter1 UVdomainandareplannedtogen
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space-chargeinthelowenergyregime,an
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!Vjitsthevelocity,and!Xjisthepositi
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equation boundarybetweenvacuumandam
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10 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.
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1.0 0.8 0.6 0.4 0.2 E=10 MeV E=42 M
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Page 39 and 40: Bu(rms)0.28T ParameterValueUnit Nu
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Page 46 and 47: ParameterValue x -0.178 x(m) 8.331
Page 48 and 49: Thepurposeofmeasuringthetransverser
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drivelaserwhereasin(A),suchoperatio
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expansionoftheBFFderivedinthischapt
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Asarstapproximation,wecanestimatetr
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errorpropagation8theoryappliedonEqn
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inducedbyspacechargeisnotaconcernin
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Golay Cell Signal (V) Golay Cell Si
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Golay Cell Ouput (V) Golay Cell Oup
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150 100 5 4 Figure5.19:Energyspectr
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Figure5.23:picturaleectoflongitudin
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. .. .. . .. . . .. . .. . . .. . .
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σ x (m) x 10−3 5 4 3 2 1 0 0 5 1
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BeamDynamicsStudies Chapter6 undula
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x,y (mm) 6.0 4.8 3.6 2.4 1.2 x y 0.
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Space Charge over Emittance Ratio (
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numericalsolution[56].Thisapproxima
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0.03 . .... . .. ... . .. ..... . .
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ε x (mm−mrad) Nominal 6 4 2 cryo
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2.2 2 1.8 Figure6.10:Comparisonofth
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6 4 2 Figure6.12:\R55"transfermapfo
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10 1 5 10 0 500 1000 1500 2000 2500
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EnergySpread(%) BunchLength(mm) Par
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15 Effect of RMS energy Spread 10 F
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6.4.4BunchSelfInteractionviaCoheren
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100 -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0
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Inthesecondseriesofrun,wewereableto
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Conclusion Chapter7 Therecirculator
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[2]Y.Shibata,T.Takahashi,T.Kanai,K.
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[29]J.-C.Denard,C.Bochetta,G.Traomb
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[65]B.C.Yunn,\ImpedancesintheIRFEL"
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TEM:transverseelectricmagnetic. TOF
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B.2Anoteonspacecharge Wedenetheslop
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B.3.3PARMELA FeaturesofJeersonLabVe
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Initialization MAIN Stop INPUT DECK
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C.0.6TheDispersionRelationsfor^S(!)
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have: Howeveritshouldbenotedthatweh
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FigureD.1:OverviewoftheRF-controlsy
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High Brightness Electron Beam Diagnostics and their ... - CASA

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