Development of a cryogenic silicon detector system and study of strange particle production in deep inelastic scattering [Elektronische Ressource] / by Rita De Masi

Description

DevelopmentofacryogenicsilicondetectorsystemandstudyofstrangeparticleproductionindeepinelasticscatteringDissertationbyRitaDeMasiPhysik DepartmentE18TechnischeUniversitat¨ Munchen¨July2004Fakultat¨ fur¨ PhysikderTechnischenUniversitat¨Munchen¨PhysikDepartmentE18DevelopmentofacryogenicsilicondetectorsystemandstudyofstrangeparticleproductionindeepinelasticscatteringRitaDeMasiVollstandiger¨ Abdruck der von der Fakultat¨ fur¨ Physik der Tech nischen Universitat¨ Munchen¨ zur Erlangung des akademischenGradeseinesDoktorsderNaturwissenschaften(Dr. rer. nat.)genehmigtenDissertation.Vorsitzender: Univ. Prof. Dr. A.J.BurasPrufer¨ derDissertation:1. Univ. Prof. Dr. St. Paul2. Univ. Prof. Dr. F.vonFeilitzschDie Dissertation wurde am 25/10/04 bei der Technischen Univer-sitat¨ Munchen¨ eingreicht und durch die Fakultat¨ fur¨ Physik am9/11/04angenommen.ContentsIntroduction 11 TheCOMPASSexperiment 51.1 Thephysicsaims . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51.1.1 Physicswiththemuonbeam . . . . . . . . . . . . . . . . . . 51.1.2withthehadronbeam . . . . . . . . . . . . . . . . . 101.2 TheCOMPASSdetector . . . . . . . . . . . . . . . . . . . . . . . . . 111.2.1 Thepolarisedbeams . . . . . . . . . . . . . . . . . . . . . . . 121.2.2 Thespectrometer . . . . . . . . . . . . . . . . . . . . . . . . . 131.2.3 ProcessingofCOMPASSdata . . . . . . . . . . . . . . . . . . 192 ThebasicprinciplesofsilicondetectorsandtheLazaruseffect 232.

Sujets

• Physik

Informations

• Publié par: technische_universitat_munchen
• Publié le: 01 janvier 2004
• Nombre de lectures: 37
• Langue: English
• Poids de l'ouvrage: 18 Mo

Extrait

Developmentsystemandofastudyofcryogenicstrangesiliconparticledetector
scatteringinelasticdeepinproduction

Dissertation

Rita

by

De

Masi

Physik-Department

echnischeT

at¨Universit

July

2004

E18

¨Munchen

Fakult¨atf¨urPhysikderTechnischenUniversit¨at
unchen¨ME18DepartmentPhysik

Developmentofacryogenicsilicondetectorsystem
andstudyinofdeepstrangeinelasticparticlescatteringproduction

MasiDeRita

Vollst¨andigerAbdruckdervonderFakult¨atf¨urPhysikderTech-
nischenUniversit¨atM¨unchenzurErlangungdesakademischen
einesGrades

DoktorsderNaturwissenschaften(Dr.rer.nat.)

Dissertation.genehmigten

Vorsitzender:Univ.-Prof.Dr.A.J.Buras
Dissertation:derufer¨Pr1.Univ.-Prof.Dr.St.Paul
2.Univ.-Prof.Dr.F.vonFeilitzsch

DieDissertationwurdeam25/10/04beiderTechnischenUniver-
sit¨atM¨uncheneingreichtunddurchdieFakult¨atf¨urPhysikam
angenommen.9/11/04

Contents

Introduction

experimentASSCOMPThe11.1Thephysicsaims.............................
1.1.1Physicswiththemuonbeam..................
1.1.2Physicswiththehadronbeam.................
1.2TheCOMPASSdetector.........................
1.2.1Thepolarisedbeams.......................
1.2.2Thespectrometer.........................
1.2.3ProcessingofCOMPASSdata..................

2ThebasicprinciplesofsilicondetectorsandtheLazaruseffect
2.1Siliconmicrostripdetectors.......................
2.1.1Basicfeatures...........................
2.1.2Particledetection.........................
2.2Radiationdamage.............................
2.2.1Defectsinsilicon.........................
2.2.2Effectsoftheradiationonthepropertiesofthedetector...
2.2.3Annealing.............................
2.3Lazaruseffect...............................
2.3.1Experimentalevidences.....................
2.3.2TheLazaruseffectmodel....................

3TheimplementationofsilicondetectorinCOMPASS
3.1ThesilicondetectorinCOMPASS....................
3.2Thedetectordesign............................
3.2.1Processingcharacteristics....................

I

1

5551011121319

2324242729293133343435

39394040

4

5

3.2.2Geometry.............................41
3.2.3Radiationhardness........................41
3.3Theelectronics...............................43
3.3.1TheAPV25............................44
3.3.2TheL-board............................46
3.3.3Therepeatercard.........................47
3.3.4TheADCcard...........................47
3.3.5TheGeSiCA............................48
3.4Thecryostat................................48
3.5Thegroundingscheme..........................51
3.6Anoverallview..............................52

Preparationandinstallationofthefirstcryogenicsiliconstationin
55ASSCOMP4.1Laboratorysetup.............................56
4.2CharacterisationoftheAPV25chipatcryogenictemperatures...57
4.2.1Coldmeasurementsetup....................57
4.2.2APV25-S0characterisation....................58
4.3Testofthecomponents..........................66
4.3.1Testoftheglue..........................68
4.3.2Testoftheconnector.......................69
4.4Temperaturedistribution.........................69
4.4.1TemperaturedistributionontheL-board:measurements..70
4.4.2Temperaturedistributiononthewafer:simulation......73
4.5AcoldstationinCOMPASSexperiment................74
4.5.1Installationintheexperiment..................74
4.5.2The2003datataking.......................75
4.5.3Detectorperformances......................76
4.6Thecoolingcontrolsystem........................76
4.6.1Themechanicaldesign......................77
4.6.2Thecontroloftheux......................80
4.6.3Theprincipleofoperation....................81

−−ThesearchfortheΞpentaquarkinCOMPASS83
5.1Introduction................................83
5.1.1Theoreticalmodels........................84

II

5.1.2Experimentalresults.......................86
5.2TheanalysisoftheCOMPASSdata...................89
5.2.1DataSampleandluminosity..................89
5.2.2Eventtopology..........................90
5.2.3Preliminaryselectionofevents.................92
005.2.4ΛandΛreconstruction....................93
5.2.5ΞandΞreconstruction....................98
−−0∗0∗−−−−
5.2.6Ξ,Ξ,ΞandΞselection................100
5.2.7MonteCarlosimulations.....................109
05.2.8Ξreconstructionefficiencyandproductioncrosssection.112
∗5.2.9AnupperlimitfortheΞproductioncrosssection.....116
−−05.2.10Ξπselection...........................118
∗5.2.11Discussionoftheresults.....................120

OutlookandConclusions

Bibliography

Acknowledgements

OwnContributions

III

125

127

133

135

FiguresofList

1.1ThePhoton-GluonFusion........................
01.2TheDforopencharmanalysis.....................
1.3TheCOMPASSsetup...........................
1.4TheM2beamline.............................
1.5TheCOMPASSspectrometerin2003..................
1.6TheDAQarchitecture..........................
1.7Thedataprocessing............................

2.1TheBethe-Blochformula.........................
2.2Defectclustersinthesiliconlattice...................
2.3Displacementdamagecrosssection...................
2.4CCEvs.temperature...........................

3.1Detectorsarrangementupstreamofthetarget.............
3.2Crosssectionofthedetector.......................
3.3Readoutstripsonthedetectors.....................
3.4Layoutofthen-sideofthesilicondetector...............
3.5LayoutoftheAPV25readoutchip...................
3.6APV25outputframe...........................
3.7L-boardslayout..............................
3.8Schematicdrawingofthecryostatforthetargetregion.......
3.9Asiliconmoduleinthecryostat.....................
3.10Thegroundingschemeforthesilicon..................
3.11Viewofthetargetregion.........................
3.12Siliconreadoutchain...........................

671212141821

25303235

404142434445465050515252

4.1SchematicviewofLNux.......................56
24.2PCBforthecoldmeasurements.....................57

V

4.3Set-upforcoldmeasurements......................59
4.4APV25-S0outputdataframe......................59
4.5APV25-S0pulseshapedependenceat130K..............60
4.6APV25-S0pulseshapedependenceat130K..............61
4.7APV25-S0noisedependence.......................62
4.8APV25-S0pulseshape..........................63
4.9Dependenceofsignalamplitudefromthetemperature........63
4.10APV25-S0gainatdifferenttemperatures................64
4.11Noisevs.capacitanceatdifferenttemperatures............64
4.12APV25-S0pipelinepedestal.......................65
4.13r.m.s.pipelinepedestal..........................65
4.14Pipelinegainuniformityat130K.....................66
4.15APV25-S0pulseshapeafter50thermalcycles.............67
4.16APV25-S0noiseafter50thermalcycles.................67
4.17ArrangementofthewaferontheL-board...............68
4.18Epoxyconnector..............................70
4.19PCBforthermaldistributionstests...................71
4.20Temperaturevs.powerdissipatedfordifferentLNuxes.....72
24.21Temperaturevs.positiononthewaferfordifferentLNuxes...72
24.22Temperaturedistributiononthesiliconwafer.............73
4.23Thecoldsetupintheexperimentalhall................75
4.24Temperaturebehaviourduring2003run................76
4.25Flowscheme................................77
4.26Distributionbox..............................78
4.27Coolingsetup...............................81

5.1Thebaryonicantidecuplet10......................85
5.2TheNA49pentaquarksignal......................88
5.3Theeventtopology............................91
5.4Theprimaryvertexdistribution.....................93
5.5Thecosαdistribution...........................95
05.6TheKpeak................................96
−5.7ThepπinvariantmassspectraforthreedifferentintervalsofZ097
Λ005.8TheΛandΛ...............................98
05.9TheKpeak................................99

VI

+005.10TheΛπandΛπinvariantmassspectra.............100
−5.11Ξπinvariantmassdistributions...................102
−−005.12ΞandΞpeaks.............................102
∗∗5.13ThexdistributionforΞπinthepγCMS..............103
∗−F5.14Ξπinvariantmassdistributionindifferentintervalsofx....104
−−F+5.15Ξπinvariantmassdistributionindifferentintervalsofx....105
−F+5.16Ξπ/Ξπdistributionindifferentintervalsofx.........106
−−−F5.17Ξπinvariantmassdistributionindifferentintervalsofx.....107
−F05.18Ξindifferentintervalsofxbackgroundsubtracted........108
∗F05.19ΞVs.x..................................109
∗F05.20TheΛπinvariantmassspectrumfromdataandMonteCarlo..111
−+5.21TheΞπinvariantmassspectrumfromdataandMonteCarlo..111
−+5.22TheΞπinvariantmassspectrumfromdataandMonteCarlo
−backgroundsubtracted..........................112
+5.23TheΞπinvariantmassspectraindifferentxintervals......113
−F+5.24ThebackgroundsubtractedΞπinvariantmassspectraindiffer-
−entintervalsofx.............................114
F05.25TheΞefficiencyasfunctionofxintervals..............115
∗F05.26TheproducedΞasfunctionofx...................116
∗F5.27TheΞπInvariantmassspectraindifferentxintervals......117
−−F05.28Ξπinvariantmassdistribution....................119
∗5.29TheNA49pen