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1、CalibrationofthefocalplanedetectsfacompactMPRneutronspectrometerwithprotonbeamfromHI13temacceleratGuoguangZhangabXiaLibJiBaobJianfuZhangaLongHoubZuyingZhoubaNthwestInstituteofNuclearTechnologyXi’anShaanxi710024P.R.CbChin

2、aInstituteofAtomicEnergyBeijing102413P.R.CABSTRACTAnewcompactmagicprotonrecoil(MPR)typespectrometerhasbeendevelopedfdiagnosingfusionneutrons.Thedesignsofbeamopticsfocalplanedetects(FPD)oftheMPRspectrometerarepresented.Th

3、ecalibrationexperimentoftheFPDwhichisconsistedofsiliconmicrostripshasbeenperfmedontheHI13temacceleratatChinaInstituteofAtomicEnergy(CIAE).Theuncertaintyofthemeasurementdataisdiscussed.Keywds:focalplanedetectenergycalibra

4、tionmagicprotonrecoilspectrometerbeamoptics1.INTRODUCTIONThemagicprotonrecoil(MPR)spectrometerhasbeenutilizedinthemeasurementofthethermonuclearneutronsfromafusionreact[12].Theinstrumentisbasedontheprinciplethatneutronsca

5、nbeconvertedtoprotonsthroughelasticscatteringinaprotonrichconversionfoilthefactthatprotons’travelinginamagicfieldcanbeseparatedinspaceduetotheirmomentumdifference.Whenprotonsenterthemagicspectrometermomentumiontakesplace

6、theirenergiescanbededucedbytheirpositionsonafocalplanedetectarrayattheexitofthespectrometer.Theprotonsareonlyrecoiledfromtheelasticscatteringprocessthereispracticallynootherextraneousproductionofprotons.Furthermeonlyfwar

7、drecoiledprotonsareusedsotheenergydownshiftissmall.Thishelpsobtaininggoodenergyresolutionlowbackgroundinterference.Thisspatialdistributioncanberelatedbacktoneutronenergyatthefoil.TheMPRspectrometerwasinstalledattheJointE

8、uropeanTus(JET)in1996hasprovideddiagnosticsofmainlyfhighneutronyieldratesfrombothdeuteriumdeuteriumdeuteriumtritiumplasmassinceFebruary1997.TheMPRweightsabout90tonsincludingthesurroundingconcreteshieldingthatisneededfred

9、ucingbackgroundinterferenceinthehostileenvironmentoftheTushall.AnovelspectrometerfthemeasurementofneutronshasbeendesignedfOMEGAtheNIF[34].Inthiswkfsolvingtheproblemsoffusionneutronenergymeasurementinaverylimitedspaceacom

10、pactMPRtypespectrometerhasbeendevelopedatNthwestInstituteofNuclearTechnology(NINT).ThewholeMPRweightsonlyabout1.5tons.ThesizeoftheMPRspectrometerisabout1.3?0.9?0.5m3.AsiliconPINdetectarraywhichconsistsof40microstripsisus

11、edasthefocalplanedetects(FPD).Eachstripsizeis2?20?0.5mm3.Thedimensionoftheprotoncollimat’sslitis2mm?20mm.TheelectricconductivityofsiliconmaterialmanufacturedbyWakeCompanyinGermanyisabout6000??cm.Thedarkcurrentofeachstrip

12、isbelow1nAat100Vbias.Aquadrupoledipole(QD)systemhasbeendevelopedtofocusadjusttheprotonbeam.TheQDsystemhasatargettoimagedemagnificationinbothtransversedirectionstherefeproducesaspectruminasmallareaonthedispersiveplanewhic

13、hcanberecdedbytheFPD.ThebeamopticsofthespectrometerwasWhenaprotonhitsonthesiliconstripofthedetectarraytheoutputgesignalrelatedtotheenergydepositedinthedetectarefedintoM32gesensitivitypreamplifiers.Theoutputsignalfromprea

14、mplifieristhensplitintotwosignalsfedintotwoCAEN568BlinearamplifierswhichconstitutestwoseparatebranchesoftheDAQsystemoneanalogueonedigitalbranch.Thedigitalbranchwhichpossesseshighthroughputrecdsthecountsofsignals(timereso

15、lved)byusingstardCAENV785NVMEsystemwhichistriggeredbythesignalfromthePSCF8000fedbyCAEN568Bfastoutputsignal.Intheanaloguebranchpulseheighthistogramsarerecdedbyusinganaloguetodigitalconversion(ADC)VMEmodules.Thepulseheight

16、histogramsareusedfofflinebackgroundcrectionsofthedata.Howeveronlysiliconsignalsaboveagivenabsolutevoltage(threshold)arerecdedsothatlowenergyeventsarerejectedautomaticallyintheDAQ.Whenthepulseheighthistogramatthecentralch

17、annelappearsmedistinctthanthatatotherchannelsbyadjustingthemagiccurrentthecurrentvalueofthepowersupplyfthemagicisfixed.Afterthepositionof14MeVprotononthefocalplanewasobtainedtheenergyofprotonbeamwaschangedstepbystepfrom1

18、2MeVto16MeVbychangingthehighvoltageoftheHI13temaccelerat.Thenthepositionspectrumthepulseheighthistogramsaremeasuredfallsiliconstripdetects.AnAm241alphastardsourceTEC448pulsegeneratwereusedfenergycalibration.Theyieldofpro

19、tonismonitedbyusinganTEC439digitalcurrentintegrat.ThespectrumofprotonsateachdetectpositioncanbededucedfromtheparametersofVMEdataacquisitionsystem.3.RESULTSDISCUSSIONFig.3showsthepositiondistributionof14MeVprotonsonfocalp

20、lanedetect.Itisclearthatonlythreechannelscanrecdtheprotonbeamfromthemagicanalysisvacuumchamber.Thepeakisatthe15thchannel.Thepulsedheightdistributionof15thchannelisshowninFig.4.Fig.3.Thepositiondistributiononfocalplanedet

21、ectFig.4.Thepulseheightdistributionof15thchannelAfterobtainingthepositionof14MeVprotononthefocalplanetheenergyofprotonischangedfrom12MeVto16MeVbychangingthehighvoltageofHI13temaccelerat.Thepositiondistributionsofdifferen

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