cdms-ii - CDMS Experiment - University of California, Berkeley

More documents

Recommendations

Info

6.8 Effects of threshold cuts, timing cuts, and nuclear recoil band on neutrons for Z1 (top left), Z2 (top right), Z3 (middle left), Z4 (middle right), Z5 (bottom left), and Z6 (bottom right). Blue dots correspond to single scatter inner electrode events after pile up rejection. Red diamonds are events passing phonon timing cuts. Solid lines indicate the analysis thresholds and the nuclear recoil acceptance band. Compare with Fig. 7.1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84 6.9 Hardware trigger (solid) and ionization analysis threshold (dashed) efficiencies versus recoil. The hardware trigger efficiency is unity above our phonon analysis thresholds. . . . . . . . . . . . . . . . . . . . . . 87 6.10 Efficiencies versus recoil for the Pile Up Cut (solid green), Nuclear Recoil Cut (dashed green), Qinner Cut (solid black), and Phonon Timing Cut (dashed black). Note that the Phonon Timing cut reduces the overall efficiency at lower energies while the Qinner cut dominates the efficiency at high energy. The Qinner efficiency drops at high energies due to low statistics and non-uniformity in the illumination of the detector. The efficiency for WIMPs is expected to remain constant making this estimate conservative. The impact of this drop should be marginal since there is very little expected WIMP signal above 50 keV. 91 6.11 Ionization spectra of three 2µCi 133 Ba calibrations: 12/05-12/16 (green), 12/16-12/18 (red), and 1/6 (blue) for the Ge ZIPs. . . . . . . . . . . 92 6.12 Mean and width of events in the Electron Recoil band for four sets of WIMP search data: 10/11-11/1 (green), 11/1-11/20 (red), 11/20-12/15 (blue), and 12/15-1/11 (black). . . . . . . . . . . . . . . . . . . . . . 93 6.13 Same as Fig. 6.12 only showing the difference of the means from yield = 1. 10/11-11/1 (green line), 11/1-11/20 (red diamonds), 11/20-12/15 (blue circles), and 12/15-1/11 (black dots). All of the Ge ZIPs deviated from yield = 1 by less than 5%. . . . . . . . . . . . . . . . . . . . . . 94 6.14 Comparison of Electron Recoil band pass fraction between the WIMP search data (black) and the neutron calibrations (red). . . . . . . . . 96 xxii
6.15 Comparison of Qinner cut pass fraction between the WIMP search data (black) and the neutron calibrations (red). . . . . . . . . . . . . . . . 97 6.16 Comparison of Phonon Timing cut pass fraction between the WIMP search data (black) and the neutron calibrations (red). . . . . . . . . 98 6.17 Electron Recoil band pass fraction difference between WIMP search data (black) and the neutron calibrations (red). . . . . . . . . . . . . 99 6.18 Qinner cut pass fraction difference between WIMP search data (black) and the neutron calibrations (red). . . . . . . . . . . . . . . . . . . . 100 6.19 Phonon Timing cut pass fraction difference between WIMP search data (black) and the neutron calibrations (red). . . . . . . . . . . . . . . . 101 6.20 Combined efficiencies for the 6 ZIPs. We fit the efficiencies to a cubic. Note that Z1 has an efficiency of zero below its 20 keV analysis threshold while all the other detectors have efficiencies of zero below 5 keV. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 6.21 Energy dependent exposure in kg days for the summed Ge ZIPs (Z1, Z2, Z3, Z5). The exposure is zero below our analysis threshold of 5 keV. The discontinuity at 20 keV corresponds to the 20 keV analysis threshold for Z1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104 6.22 Expected sensitivity. 50% of the simulated experiments lie in the yellow shaded region. The thick black curve corresponds to the median of the ensemble. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105 7.1 Plots for Z1 (top left), Z2 (top right), Z3 (middle left), Z4 (middle right), Z5 (bottom left), and Z6 (bottom right) showing the application of the analysis cuts to the WIMP search data. Blue dots correspond to single scatter inner electrode events after pile up rejection. The red diamonds are events passing the phonon timing cuts. Solid lines indicate the analysis thresholds and the nuclear recoil acceptance bands. Compare with Fig. 6.8. Only one candidate event in Z5 at ∼60 keV passes all of the cuts. . . . . . . . . . . . . . . . . . . . . . . . . . . . 108 xxiii
Page 1 and 2: THE CRYOGENIC DARK MATTER SEARCH (C
Page 3: I certify that I have read this dis
Page 7 and 8: In loving memory of Helena Hsu. vii
Page 9: Acknowledgements It goes without sa
Page 12 and 13: 2.2 The Ionization Measurement . .
Page 14 and 15: A.4 Code for Some Useful Table Util
Page 16 and 17: List of Figures 1.1 Fermion loop co
Page 18 and 19: 2.1 Diagram of a ZIP detector. Bott
Page 20 and 21: 3.6 Left: Risetime distributions fo
Page 24 and 25: 7.2 Exclusion limit from this analy
Page 26 and 27: 2 CHAPTER 1. INTRODUCTION Though th
Page 28 and 29: 4 CHAPTER 1. INTRODUCTION Figure 1.
Page 34 and 35: 10 CHAPTER 1. INTRODUCTION Figure 1
Page 36 and 37: 12 CHAPTER 1. INTRODUCTION ϕ ç ç
Page 38 and 39: 14 CHAPTER 1. INTRODUCTION Other Da
Page 42 and 43: 18 CHAPTER 1. INTRODUCTION c q c q
Page 46 and 47: 22 CHAPTER 1. INTRODUCTION mass. ZE
Page 48 and 49: 24 CHAPTER 1. INTRODUCTION 10 −40
Page 50 and 51: 26 CHAPTER 2. DETECTORS Figure 2.1:
Page 56 and 57: 32 CHAPTER 2. DETECTORS 4000 3000 2
Page 60 and 61: 36 CHAPTER 2. DETECTORS can diffuse
Page 66 and 67: 42 CHAPTER 2. DETECTORS 2.3.3 Surfa
Page 69 and 70: Chapter 3 Event Reconstruction 3.1
Page 71 and 72: 040531_1424_G31yplot.pdf 3.1. RECON
Page 73 and 74:
3.2. POSITION DEPENDENCE OF THE DET
Page 75 and 76:
Page 77 and 78:
Page 79 and 80:
Chapter 4 The Phonon Lookup Table A
Page 81 and 82:
4.1. THE ALGORITHM 57 Figure 4.1: l
Page 83 and 84:
4.2. THE LOOKUP TABLE IN REAL LIFE
Page 85 and 86:
4.3. THE LOOKUP TABLE AND SOUDAN R1
Page 87:
4.3. THE LOOKUP TABLE AND SOUDAN R1
Page 90 and 91:
66 CHAPTER 5. THE CDMS II SOUDAN IN
Page 92 and 93:
Page 94 and 95:
Page 96 and 97:
Page 98 and 99:
Page 100 and 101:
76 CHAPTER 6. THE DEEP SITE MEASURE
Page 102 and 103:
Page 104 and 105:
040531_2238_Ge10keVee.pdf 040531_22
Page 106 and 107:
Page 108 and 109:
Page 110 and 111:
Page 112 and 113:
Page 114 and 115:
Page 116 and 117:
Page 118 and 119:
Page 120 and 121:
Page 122 and 123:
Page 124 and 125:
100 CHAPTER 6. THE DEEP SITE MEASUR
Page 126 and 127:
Page 128 and 129:
Page 130 and 131:
106
Page 132 and 133:
108 CHAPTER 7. CONCLUSION AND DISCU
Page 134 and 135:
Page 136 and 137:
Page 138 and 139:
Page 140 and 141:
116APPENDIX A. INSTRUCTIONS AND COD
Page 142 and 143:
Page 144 and 145:
Page 146 and 147:
Page 148 and 149:
Page 150 and 151:
Page 152 and 153:
Page 154 and 155:
Page 156 and 157:
132 BIBLIOGRAPHY [10] M. Tegmark et
Page 158 and 159:
134 BIBLIOGRAPHY [33] M. W. Goodman
Page 160 and 161:
136 BIBLIOGRAPHY [56] R. P. Welty a
show all

cdms-ii - CDMS Experiment - University of California, Berkeley

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?