Setup of a Drift Tube Muon Tracker and Calibration of Muon ...

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zyxModule b.0Module a.0Module b.1Module a.1Figure 3.4: Reference system of the prototype. Solid lines denote the front (electronics)end of each module. Modules with the same letter (a or b) are connected to thesame TDC. The exact coordinates of the modules are presented in Tab. 3.2.3.2.4 ElectronicsThe electronics for data readout and slow control are mounted at one end of amodule. High voltage is distributed to the anode wires via a high voltage (HV)board. One board per layer is used. The end of each anode wire is lead throughthe end cap of the tube and directly soldered to the HV board. The board alsohas connectors for the read out electronics, where the so-called preamp boards areplugged in. As the name suggests, the preamp boards contain the electronics forthe amplification of the drift tube signals. The amplification is done by the L3chip set [59], a preamp board contains three of these chips, each connected to fourchannels. Besides pre-amplification, the board also contains a discriminator for eachchannel which is used to set the signal threshold. Through the preamp board it isalso possible to send test pulses on each channel. Both the discriminators and thetest pulse function are controlled via a special slow control support board describedin the next section. Each preamp board is connected to the read out and controlboards by a ribbon cable. The orientation of the HV board and the order in whichthe ribbon cables are connected to the TDC (top to bottom or vice versa) determinethe channel mapping. The CMT has been cabled from top to bottom. The HVboard was mounted in a way, that smaller numbered channels start on the right sideof the module. This leads to the channel map depicted in Fig. 3.5.Time measurement, trigger and slow control electronics are all located in onecrate. Two modules at a time are connected to both a support board and and aTDC board. A trigger board provides the trigger for all modules.26
y TDC 011 10 9 8 7 6 5 4 3 2 1 023 22 21 20 19 18 17 16 15 14 13 12xTDC 135 34 33 32 31 30 29 28 27 26 25 2447 46 45 44 43 42 41 40 39 38 37 3611 10 9 8 7 6 5 4 3 2 1 023 22 21 20 19 18 17 16 15 14 13 1235 34 33 32 31 30 29 28 27 26 25 2447 46 45 44 43 42 41 40 39 38 37 3659 58 57 56 55 54 53 52 51 50 49 4871 70 69 68 67 66 65 64 63 62 61 6083 82 81 80 79 78 77 76 75 74 73 7295 94 93 92 91 90 89 88 87 86 85 8459 58 57 56 55 54 53 52 51 50 49 4871 70 69 68 67 66 65 64 63 62 61 6083 82 81 80 79 78 77 76 75 74 73 7295 94 93 92 91 90 89 88 87 86 85 84Figure 3.5: Left: Online display of test pulse events. The event shows test pulsesfor all odd channels on TDC 1. Right: Channel assignment of the Compact MuonTracker. Different colors indicate the different TDCs and hence different planes. Theorigin of the coordinate system lies in the tube mapped with channel 42 of TDC 0.The picture shows an overlay of the x − z and y − z plane.3.2.5 Slow ControlThe slow control of the preamp boards is mainly done through the OPERA SupportBoard (OSUB). It is used to set all relevant parameters on the preamp boards. TheOSUB can be addressed via CAN 1 bus. For the operation of the muon tracker, a newcontrol software has been developed within this thesis. Unlike the OPERA OSUBsoftware it is based on Linux and has a simple console output in form of dialogs.This has the advantage that only one computer is needed for the whole operationof the detector including the DAQ. Also, remote control is easier without the needof a graphical display. The same software is used to control the trigger board. Theuser interface of the slow control software is depicted in Fig. 3.6. A list of variableswhich can be set by the program can be found in Tab. A.1. Most important is thesetting of the discriminator threshold. It can be set for either a single channel orfor all channels at a time. Furthermore, test pulses can be generated to test thefunctionality of the preamps and data acquisition. For a complete overview of theOSUB see [60].The slow control software is also capable of communicating with the OPERATrigger Board (OTB). It is used to distribute the external trigger signal to all TDCs.The OTB has five input channels of which only two are used in this setup, oneeach for the scintillators above and below the detector. With the slow control, thecoincidence requirement can be set (both scintillator layers have to have a coincident1 CAN Controller Area Network27
Page 1 and 2: Setup of a Drift Tube Muon Trackera
Page 3: AbstractIn this work the setup and
Page 6 and 7: 3.5.5 Pattern Recognition . . . . .
Page 8 and 9: viii
Page 10 and 11: essential for vetoing these events.
Page 13 and 14: Chapter 2NeutrinosThe standard mode
Page 15 and 16: However, it did not yet deliver an
Page 17 and 18: Table 2.1: Neutrino oscillation par
Page 19 and 20: this assumption, the Standard Solar
Page 21 and 22: Figure 2.1: Neutrino flux at Earth
Page 23 and 24: asymmetry between neutrino and anti
Page 25 and 26: Figure 2.3: Expected ¯ν e energy
Page 27: Nb neutrino/fission-11010-2Neutrino
Page 30 and 31: 108−dE/dx (MeV g −1 cm 2 )65432
Page 32 and 33: Figure 3.3: Setup of the muon track
Page 36 and 37: Figure 3.6: Display of the slow con
Page 38 and 39: plastic scintillators. To avoid all
Page 40 and 41: N hitsHitmap Plane 06000h_hitmap0En
Page 42 and 43: Table 3.4: Data structure for calib
Page 44 and 45: TDC SpectrumN/[2 Channels]1000800H_
Page 46 and 47: Table 3.5: List of variables calcul
Page 48 and 49: with ∆⃗q = ⃗q n − ⃗q n−
Page 50 and 51: N [a.u.]∆ α (x)2200020000da0Entr
Page 52 and 53: d[mm]Reco Drift Distances201816H_RE
Page 54 and 55: N [a.u.]Real DataReal data0.06MCh1E
Page 56 and 57: χ 2N [a.u.]Probability103×10hc2p0
Page 58 and 59: N [a.u]Residuals20001800h0Entries 3
Page 60 and 61: Counts/(10 keV × day × 100 tons)1
Page 62 and 63: 4.1.3 Čerenkov LightČerenkov dete
Page 64 and 65: 4.2 The Borexino DetectorThe Borexi
Page 66 and 67: muons, is reduced by going deep und
Page 68 and 69: (typically below 50 cm), the locati
Page 70 and 71: 510Counts/(10 keV x day x 100 tons)
Page 72 and 73: counts/days*4 hitsDay (Red) and Nig
Page 74 and 75: eeSurvival probability for ν e, P0
Page 76 and 77: the CMT to the Borexino tracking, t
Page 78 and 79: P C P DSCINT C SCINT DySCINT BSCINT
Page 80 and 81: Figure 5.2: The CMT setup on top of
Page 82 and 83: Angular AcceptanceAngular Acceptanc
Page 84 and 85:
Comparison nhits=3 vs nhits=4N [a.u
Page 86 and 87:
Table 5.3: Overview of all muon run
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N/dayAll Triggers vs Time12000h_tim
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Reco Hits in Scintillatory [mm]1000
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PMTPMTScintillatorPMTPMTFigure 5.16
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the CMT data file and the Borexino
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Zenith Angle CMT and BX-GL Tracks h
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Lateral x Resolution CMT - IDhlatx_
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Distance d between CMT and BX-GL Tr
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Angular difference αN [arbitrary u
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[m]z bxTrack Position in BX x=0 Pla
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N [arbitrary units]∆y all data200
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To determine the Borexino tracking
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Table A.1: Variables that can be se
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espectively. The channel numbers ar
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xyϕϕ ′βx ′µFigure C.2: Rela
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the z-coordinate z op,0 of the firs
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xyEvent: 470, Entry: 470, Time Tue
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[14] Ch. Kraus et al. Final Results
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[49] T. Araki et al. Experimental i
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116
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Jan Lenkeit und Björn Wonsak sowie
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