a design study for a cobra upgrade to - Institut für Kern- und ...

More documents

Recommendations

Info

100 B SECOND APPENDIX Cube, scint64ScintillatorHolder and scint64Shield. In the centre of the detector is the scint64Nest, which contains 64 array64paintedcrystal volumes. They are placed on delrin holders in a delrin box with one open side and a wall thickness of 2 mm. The Nest parameters can be changed as in the Array64 package with a /scint64/nest/ command. The scint64Scintillator and scint64ScintillatorCube are classes, defining a 5x5x20 and 5x5x5 cm 3 volume of CsI. The classes scint64PaintedScintillator and scint64Painted- ScintillatorCube contain the scint64Scintillator or scint64ScintillatorCube volumes, reflector and PMT volumes. The scint64PaintedScintillator volumes contain beside the scint64Scintillator volume, four reflector volumes of MgO (20x5x0.05 cm 3 ) and two borosilicate glass volumes (5x5x0.2 cm 3 ) representing PMT windows. The scint64PaintedScintillator- Cube contains five reflector volumes and only one PMT window volume. The class scint64ScintillatorHolder contains the subcomponents scint64PaintedScintillator and scint64Painted- ScintillatorCube. All scintillator volumes are placed with the PMT window volumes facing the front and back side of the assembly. The scint64ScintillatorHolder and scint64Nest volumes are finally contained in the scint64Shield class. The scint64Nest is placed in the middle standing upon two scint64Painted- Scintillator volumes. The scint64ScintillatorHolder sourrounds the scint64Nest. Then one 5 cm thick copper and one 10 cm thick lead layer are constructed and placed around the scint64- ScintillatorHolder. The final dimensions of this assembly are 51.4 x 51.4 x 50.6 cm 3 . The material and thickness of the Cu and Pb shielding can be changed with the commands /scint64/Cuwidth and /scint64/Pbwidth. Scint64 uses the default data structure for the CZT crystals and a slightly shorter output for the scintillators. The classes scint64Scintillator and scint64ScintillatorCube have own sensitive detector classes and data classes. The final Root output file holds three trees, containing the array64crystal data, the scint64Scintillator data and the scint64ScintillatorCube data. The latter two Root trees have each three branches, storing the deposited energy, the the scintillator ID (ranging from 1 to 20) and the type of the ionizing particle. Each event is stored in one vector and the information of different detectors are stored as vector components of the corresponding event.
B.2 Geant4 101 The vectors of one event have the same length in all three branches, connecting the vector components bijective with the other branches. The scint64Scintillator houses the data of scintillators with the scintillator ID 1-5, 10, 11 and 16-20. The scint64ScintillatorCube data contains the scintillator IDs 6-9 and 12-15. The kind of ionizing particle is important for the particle dependent scintillator response. It determines the signal height and form of the scintillation detector response. 99 % of all alpha particles in the CsI scintillator can be identified with a pulse shape discrimination [32]. The particle type information can therefore be used to veto the majority of all alpha decays in the scintillator volume. In this package, the quenching of the scintillation light output for alpha particles is also considered and used a Birks factor of kB = 2.3 · 10 −3 gMeV −1 cm −2 as reported by Tretyak [31]. At run time a for alpha particles, according to their stopping power, reduced energy is added after each step to the Hitscollection.
Page 1 and 2:
A DESIGN STUDY FOR A COBRA UPGRADE
Page 3:
I hereby declare that I have create
Page 6 and 7:
vi Abstract
Page 8 and 9:
viii Überblick
Page 10 and 11:
x Contents 4.1.2 Scintillation proc
Page 12 and 13:
xii Contents
Page 14 and 15:
2 1 Introduction The CdZnTe detecto
Page 16 and 17:
4 2 Neutrino physics mass scales no
Page 18 and 19:
6 2 Neutrino physics Ground states
Page 20 and 21:
8 2 Neutrino physics mi: 〈mνe〉
Page 22 and 23:
10 2 Neutrino physics
Page 24 and 25:
12 3 The COBRA experiment CdZnTe (C
Page 26 and 27:
14 3 The COBRA experiment 1420:480:
Page 28 and 29:
16 3 The COBRA experiment Figure 3.
Page 30 and 31:
18 3 The COBRA experiment They are
Page 32 and 33:
20 3 The COBRA experiment Therefore
Page 34 and 35:
22 4 Scintillation detectors search
Page 36 and 37:
24 4 Scintillation detectors Figure
Page 38 and 39:
26 4 Scintillation detectors spectr
Page 40 and 41:
28 4 Scintillation detectors SCINTI
Page 42 and 43:
30 4 Scintillation detectors emissi
Page 44 and 45:
32 4 Scintillation detectors activa
Page 46 and 47:
34 4 Scintillation detectors descri
Page 48 and 49:
Page 50 and 51:
38 4 Scintillation detectors group
Page 52 and 53:
Page 54 and 55:
Page 56 and 57:
44 4 Scintillation detectors AVALAN
Page 58 and 59:
Page 60 and 61:
48 4 Scintillation detectors gap. T
Page 62 and 63: 50 4 Scintillation detectors photoc
Page 64 and 65: 52 5 Scintillator upgrade ergy phys
Page 66 and 67: 54 5 Scintillator upgrade event ID
Page 68 and 69: 56 5 Scintillator upgrade Ephoton (
Page 70 and 71: 58 5 Scintillator upgrade back side
Page 72 and 73: 60 5 Scintillator upgrade three dif
Page 74 and 75: 62 5 Scintillator upgrade vice. The
Page 76 and 77: 64 5 Scintillator upgrade lecting e
Page 78 and 79: 66 5 Scintillator upgrade Figure 5.
Page 84 and 85: 72 5 Scintillator upgrade In 3.1 %
Page 86 and 87: 74 5 Scintillator upgrade were repo
Page 90 and 91: 78 5 Scintillator upgrade crystal p
Page 92 and 93: 80 5 Scintillator upgrade and gamma
Page 94 and 95: 82 5 Scintillator upgrade Backgroun
Page 96 and 97: 84 5 Scintillator upgrade source of
Page 98 and 99: 86 6 Summary and future work dimens
Page 100 and 101: 88 A FIRST APPENDIX Scintillator De
Page 102 and 103: 90 A FIRST APPENDIX A.2 Reports abo
Page 104 and 105: 92 A FIRST APPENDIX trons than a st
Page 106 and 107: 94 B SECOND APPENDIX Figure B.1: Am
Page 108 and 109: 96 B SECOND APPENDIX Figure B.5: Am
Page 110 and 111: 98 B SECOND APPENDIX B.2 Geant4 Gea
Page 114 and 115: 102 B SECOND APPENDIX
Page 116 and 117: 104 Bibliography [13] H. V. Klapdor
Page 118 and 119: 106 Bibliography [43] T. Y. Kim et
Page 120: Typeset September 29, 2010
show all

a design study for a cobra upgrade to - Institut für Kern- und ...

Create successful ePaper yourself

Delete template?

Save as template?