High Brightness Electron Beam Diagnostics and their ... - CASA
High Brightness Electron Beam Diagnostics and their ... - CASA High Brightness Electron Beam Diagnostics and their ... - CASA
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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Actuator Inserts<br />
Foil <strong>and</strong> Mirror<br />
CID<br />
Camera<br />
10000<br />
9500<br />
Lens<br />
9000<br />
8500<br />
Lens<br />
8000<br />
4200 4400 4600 4800 5000 5200 5400 5600 5800 6000 6200<br />
x (µm)<br />
e- ~ 1 mm (full width)<br />
atypicalbeamdensitymeasuredwithsuchdevice(B). Figure4.9:OverviewofthecarbonfoilbasedOTRexperiment(CourtesyfromS.Spata)(A)<strong>and</strong> damaged,aspredictedbyourthermalstudies. Ongure4.9(B)weshowtypicalmeasuredbeamdensity.Thebeamsize(deneastherms<br />
Transition<br />
Radiation<br />
rmsbeamsizewiththeoneobtainedusingthewirescannerincloseproximity<strong>and</strong>obtainedthe<br />
Mirror<br />
samebeamwidthwithintheuncertaintytoleranceasshowninTable4.3.1.<br />
Horizontal axis<br />
Carbon Foil<br />
<strong>Beam</strong><br />
TothebestofourknowledgethisisthersttimeTRwasusedtomeasuredbeamsizeofhundredsof compatiblewiththeoneexpectedusingthemagneticopticscodeDIMAD.Wealsocomparethese value),obtainedperforminganonlineartofthetransverseproleswithaGaussi<strong>and</strong>istribution, are255m<strong>and</strong>130mforrespectivelythehorizontal<strong>and</strong>verticaldirections.Thesevaluesare<br />
(A) (B)<br />
FORWARD OTR MONITOR<br />
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 source<strong>and</strong>itsextentareboundedbytherelation0>=(4).InthecaseofTR,thecommon mistakeistowrite0'1=whichnallyyieldtotherelation0
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