Study of backgrounds in the CRESST dark matter search:
Gespeichert in:
1. Verfasser: | |
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Format: | Abschlussarbeit Buch |
Sprache: | English |
Veröffentlicht: |
2013
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Schlagworte: | |
Online-Zugang: | kostenfrei https://nbn-resolving.org/urn:nbn:de:bvb:91-diss-20130723-1165619-0-7 Inhaltsverzeichnis |
Beschreibung: | VII, 247 S. Ill., graph. Darst. |
Internformat
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Datensatz im Suchindex
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adam_text | CONTENTS
1. DARK
MATTER 1
1.1. EVIDENCE FOR DARK MATTER 1
1.1.1. GALACTIC AND CLUSTER SCALE 1
1.1.2. COSMIC SCALE 2
1.2. DARK MATTER CANDIDATES 3
1.3. DETECTION EXPERIMENTS FOR WIMPS 5
1.3.1. ACCELERATOR EXPERIMENTS 5
1.3.2. INDIRECT SEARCHES 5
1.3.3. DIRECT SEARCHES 7
1.4. DIRECT DETECTION OF WIMPS 11
1.4.1. DETECTION RATE 11
1.4.2. LOW ENERGY 12
1.4.3. RECOIL SPECTRUM 12
2. THE CRESST EXPERIMENT 17
2.1. BACKGROUND AND BACKGROUND REDUCTION 17
2.1.1. MUONS . 17
2.1.2. GAMMAS AND ELECTRONS 19
2.1.3. RADON 21
2.1.4. NEUTRONS 21
2.2. EXPERIMENTAL SET-UP 22
2.3. DETECTOR PRINCIPLE 23
2.3.1. OVERVIEW 25
2.3.2. CRYOGENIC CALORIMETERS 25
2.4. TWO-CHANNEL DETECTION 27
2.4.1. SCINTILLATING ABSORBERS 27
2.4.2. CRYOGENIC LIGHT DETECTOR 28
2.4.3. LIGHT/PHONON DISCRIMINATION 29
2.4.4. TARGET NUCLEI FOR DARK MATTER SEARCH 33
2.5. SCINTILLATING SURROUNDING 34
2.6. ADVANTAGES OF CRESST DETECTORS 38
2.6.1. REMARKS ON DETECTOR PERFORMANCE 38
2.6.2. ALTERNATIVE SCINTILLATING MATERIALS 43
2.7. SUMMARY AND CONCLUSIONS FROM RUN 32 43
III
HTTP://D-NB.INFO/1050048016
IV CONTENTS
3. DETECTION PRINCIPLE 47
3.1. HEAT CAPACITY 47
3.1.1. DIELECTRICS AND SEMICONDUCTORS 47
3.1.2. METALS 48
3.1.3. SUPERCONDUCTING METALS 48
3.2. TRANSITION EDGE SENSOR (TES) 49
3.3. RELAXATION PROCESSES 50
3.4. THERMAL COUPLING 51
3.4.1. KAPITZA COUPLING 51
3.4.2. ELECTRON-PHONON COUPLING 52
3.4.3. THERMAL COUPLING TO THE HEAT BATH 54
3.5. SIGNAL FORMATION MODEL FOR CRYOGENIC CALORIMETERS 54
4. DETECTOR OPERATION AND DATA ANALYSIS 59
4.1. SQUID-BASED READOUT 59
4.2. DATA ACQUISITION 60
4.2.1. BIAS SUPPLY CHAIN 62
4.2.2. SIGNAL READOUT CHAIN 62
4.2.3. HEATER CHAIN 62
4.3. DATA PREPARATION 63
4.3.1. PULSE PARAMETERS 63
4.3.2. PULSE HEIGHT EVALUATION 65
4.3.3. ENERGY CALIBRATION 68
4.4. CUTS 72
4.4.1. STABILITY CUT 72
4.4.2. PEAK POSITION 72
4.4.3. RIGHT-LEFT BASELINE 74
4.4.4. ONSET-DELAY IN EVENT 74
4.4.5. PULSE AMPLITUDE 74
4.4.6. RMS OF THE TEMPLATE FIT 76
5. DETAILED EXAMINATION OF BACKGROUND 77
5.1. MOTIVATION 77
5.2. OBSERVATIONS FROM RUN 31 78
5.2.1. FOIL COVERED CLAMPS 79
5.2.2. ARALDITE COVERED CLAMPS 83
5.2.3. PURE METAL CLAMPS 87
5.2.4. SUMMARY FROM RUN 31 DATA 92
5.3. OBSERVATIONS FROM RUN 32 92
5.3.1. CLAMP MANUFACTURING 93
5.3.2. RESULTS 94
CONTENTS V
5.4. ORIGIN OF THE LOW ENERGY ALPHA-BACKGROUND 96
5.4.1. CLAMP BULK MATERIAL 97
5.5. ORIGIN OF THE PB-RECOIL BACKGROUND IN RUN 32 100
5.5.1. SILVER COATING OF CLAMPS 100
5.5.2. IMPLANTATION OF DAUGHTERS OF RN-222 101
5.5.3. TIME DEPENDENCE OF PB-RECOIL EVENTS IN RUN 32 103
5.6. RELAXATION EVENTS 106
5.7. SECONDARY BACKGROUNDS 108
5.7.1. SPUTTERING ON THE CLAMPS 108
5.7.2. SPUTTERING ON THE SCINTILLATING AND REFLECTIVE FOIL 108
5.7.3. CONCLUSION 109
6. DEVELOPMENT OF NEW CLAMPING CONCEPTS 111
6.1. OVERVIEW ILL
6.2. BULK MATERIAL 112
6.2.1. REQUIREMENTS 112
6.2.2. NOSV COPPER 112
6.2.3. TIN 114
6.2.4. PRODUCTION OF CUSN6 118
6.3. REFLECTIVE COVERAGE OF CLAMPS 119
6.3.1. ETCHING . . . 120
6.3.2. PASSIVATING 120
6.3.3. SPUTTERING . 120
6.4. SCINTILLATING COATING OF CLAMPS 121
6.4.1. MOTIVATION 121
6.4.2. SET-UP TO STUDY SCINTILLATION EFFICIENCIES 123
6.4.3. ZNO LAYER 124
6.4.4. PLASTIC SCINTILLATOR 125
6.4.5. SUMMARY 126
6.5. CRYSTAL-CLAMP INTERFACE 127
6.5.1. CALCIUM TUNGSTATE BALLS 127
6.5.2. CALCIUM TUNGSTATE HALF-CYLINDERS 128
6.5.3. NOSV HALF-CYLINDERS 128
6.5.4. PURE METAL CONCEPT 130
7. RESULTS FOR DIFFERENT CLAMP CONCEPTS 133
7.1. TEST-FACILITY AT GRAN SASSO 133
7.2. DETECTOR MODULE 134
7.2.1. CRYSTAL AND LIGHT DETECTOR 134
7.2.2. HOLDER DESIGN 135
7.3. RESULTS OF TESTED CONCEPTS 135
7.3.1. CALCIUM TUNGSTATE BALLS 137
VI CONTENTS
7.3.2. CALCIUM TUNGSTATE HALF-CYLINDERS 141
7.3.3. NOSV COPPER HALF-CYLINDERS 148
7.3.4. PURE METAL CLAMPS 151
7.4. RESUME 152
8. LOW ENERGY ALPHA ANALYSIS 155
8.1. MOTIVATION 155
8.2. INTERACTION OF IONIZING PARTICLES IN MATTER 156
8.2.1. STOPPING OF CHARGED PARTICLES 156
8.2.2. SCINTILLATION RESPONSE TO HIGHLY IONIZING PARTICLES 158
8.3. EXPERIMENTAL ARRANGEMENT 161
8.3.1. DETECTOR MODULE 161
8.3.2. DEGRADED ALPHA SOURCE 162
8.4. DATA DESCRIPTION MODEL 164
8.4.1. FITTING THE ELECTRON/GAMMA-EVENT DISTRIBUTION 164
8.4.2. FITTING THE ALPHA-PARTICLE DISTRIBUTION 166
8.4.3. MAXIMUM LIKELIHOOD FIT 167
8.5. RESULTS FROM CALCIUM TUNGSTATE 169
8.5.1. FITTING THE GAMMA-AND ALPHA-PARTICLE DISTRIBUTION 169
8.5.2. QUALITATIVE AGREEMENT OF DATA AND FIT 173
8.5.3. COMPARISON TO RUN 32 173
8.5.4. STATISTICAL ERROR OF THE QF 175
8.6. RESULTS FROM CADMIUM TUNGSTATE 175
8.6.1. FITTING THE GAMMA- AND ALPHA-PARTICLE DISTRIBUTION 175
8.6.2. QUALITATIVE AGREEMENT OF DATA AND FIT 177
8.6.3. STATISTICAL ERROR OF THE FIT 179
8.7. SUMMARY 179
9. SEMI-EMPIRICAL DESCRIPTION OF QUENCHING FACTORS 181
9.1. SEMI-EMPIRICAL METHOD 182
9.2. STOPPING POWERS FOR IONS IN CALCIUM TUNGSTATE 183
9.3. FITTING THE DATA 185
9.3.1., MEAN OF THE DISTRIBUTION OF ELECTRON/GAMMA-EVENTS 185
9.3.2. MEAN OF THE DISTRIBUTION OF ALPHAS AND NUCLEAR RECOILS .... 185
9.4. RESULTS FOR ALPHA-PARTICLES 186
9.4.1. QUALITATIVE AGREEMENT OF DATA AND FIT 186
9.4.2. DISCUSSION AND INTERPRETATION 188
9.5. RESULTS FOR 0-, CA- AND W-RECOILS 189
9.5.1. NEUTRON SOURCE 190
9.5.2. DISCUSSION ON RESULTS 190
9.5.3. QUALITATIVE AGREEMENT OF DATA AND FIT 194
9.5.4. STATISTICAL ERROR OF THE QF 194
CONTENTS VII
9.6. SUMMARY AND OUTLOOK 197
LO.CONCLUSION AND PERSPECTIVE 199
APPENDICES 203
A. TEST CRYOSTAT AT GRAN SASSO 203
A.L. UNDERGROUND SITE 203
A.2. DILUTION REFRIGERATOR 203
A.3. ELECTRONICS AND DAQ 206
A.4. PERFORMANCE 206
A.4.1. CONDITIONS FOR DETECTOR OPERATION 206
A.4.2. LONG TERM STABILITY 207
A.4.3. GAMMA-BACKGROUND 207
B. ALTERNATIVE SCINTILLATORS 211
B.L. CADMIUM TUNGSTATE 212
B.L.L. PROPERTIES 212
B.1.2. EXPERIMENTAL SET-UP 214
B.1.3. LIGHT OUTPUT AT LOW TEMPERATURES 214
B.L.4. EVENT DISCRIMINATION 216
B. 1.5. RADIOACTIVITY IN CADMIUM TUNGSTATE 217
B.1.6. NEUTRINO PHYSICS AND PERSPECTIVES 219
B.2. CESIUM IODIDE 221
B.2.1. EXPERIMENTAL SET-UP 221
B.2.2. LIGHT OUTPUT AT LOW TEMPERATURES 221
B.2.3. PERFORMANCE OF THE PHONON CHANNEL 222
C. SPUTTERING 225
C. 1. ENERGY SPECTRUM OF SPUTTERED SET OF IONS 225
C.2. ENERGY SPECTRUM OF SPUTTERED 0-, C- AND H-IONS 227
C.3. CONCLUSION AND OUTLOOK 227
D. CALCULATION OF QUENCHED BANDS 229
E. DESCRIPTION OF THE ELECTRON/GAMMA-DISTRIBUTION 231
BIBLIOGRAPHY 234
ACKNOWLEDGMENTS 245
|
any_adam_object | 1 |
author | Schäffner, Karoline Julia |
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dewey-search | 530 |
dewey-sort | 3530 |
dewey-tens | 530 - Physics |
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spelling | Schäffner, Karoline Julia Verfasser aut Study of backgrounds in the CRESST dark matter search Karoline Julia Schäffner 2013 VII, 247 S. Ill., graph. Darst. txt rdacontent n rdamedia nc rdacarrier München, Techn. Univ., Diss., 2013 Signaluntergrund (DE-588)4492282-6 gnd rswk-swf CRESST Teilchendetektor (DE-588)4838359-4 gnd rswk-swf (DE-588)4113937-9 Hochschulschrift gnd-content CRESST Teilchendetektor (DE-588)4838359-4 s Signaluntergrund (DE-588)4492282-6 s DE-604 Erscheint auch als Online-Ausgabe urn:nbn:de:bvb:91-diss-20130723-1165619-0-7 http://mediatum.ub.tum.de/node?id=1165619 Verlag kostenfrei Volltext https://nbn-resolving.org/urn:nbn:de:bvb:91-diss-20130723-1165619-0-7 Resolving-System DNB Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=027141666&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
spellingShingle | Schäffner, Karoline Julia Study of backgrounds in the CRESST dark matter search Signaluntergrund (DE-588)4492282-6 gnd CRESST Teilchendetektor (DE-588)4838359-4 gnd |
subject_GND | (DE-588)4492282-6 (DE-588)4838359-4 (DE-588)4113937-9 |
title | Study of backgrounds in the CRESST dark matter search |
title_auth | Study of backgrounds in the CRESST dark matter search |
title_exact_search | Study of backgrounds in the CRESST dark matter search |
title_full | Study of backgrounds in the CRESST dark matter search Karoline Julia Schäffner |
title_fullStr | Study of backgrounds in the CRESST dark matter search Karoline Julia Schäffner |
title_full_unstemmed | Study of backgrounds in the CRESST dark matter search Karoline Julia Schäffner |
title_short | Study of backgrounds in the CRESST dark matter search |
title_sort | study of backgrounds in the cresst dark matter search |
topic | Signaluntergrund (DE-588)4492282-6 gnd CRESST Teilchendetektor (DE-588)4838359-4 gnd |
topic_facet | Signaluntergrund CRESST Teilchendetektor Hochschulschrift |
url | http://mediatum.ub.tum.de/node?id=1165619 https://nbn-resolving.org/urn:nbn:de:bvb:91-diss-20130723-1165619-0-7 http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=027141666&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
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