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

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To determine the Borexino tracking resolution, the tracker has been installed ontop of the experiment’s steel dome at the LNGS underground laboratory. Due toits small size the CMT can merely sample a small fraction of the muons crossingBorexino. Comparing these events with the tracks reconstructed in Borexino yieldsan angular resolution of approximately 4 ◦ and a spatial resolution of approximately50 cm of the Borexino tracking. A similar analysis was done using reference tracksof CNGS rock muons reconstructed by the OPERA experiment yielding comparableresults.Data taking with the CMT is still ongoing and will improve significantly aftera trigger upgrade foreseen for spring 2011. With higher statistics, an improvedcalibration will be possible. The events common to Borexino and the CMT havebeen matched manually so far. Once the new trigger is installed and the calibrationimproved, it is planned to include the CMT data directly into to Borexino dataprocessing. In this way, a comparison of CMT and Borexino tracks becomes mucheasier and allows for an identification of possible systematic errors in the Borexinotracking.100
Appendix ASlow Control SoftwareThe slow control software developed in this thesis is based on a simple shell scriptthat can be controlled through dialogs. The kernel module for controlling the PEAKUSB CAN adapter creates a device /dev/pcan32 which can be addresses throughtext messages. The slow control software converts the user input into CAN textmessages and sends them to the device. For testing, the device address can bechanged to a temporary file; the CAN messages are then stored in the file insteadof being sent to the device. CAN responses can also be accessed through the device/dev/pcan32. Once the control software is started, a background process watchesthe device and saves all messages in a temporary file. That way, the slow controlsoftware has access to all response messages.The different slow control settings are managed in environment variables. Thedifferent variables used and their default values are presented in Tab. A.1. Thevalues can be modified through the dialogs. To apply the settings to the detector,values have to be sent. The CAN messages are only generated and sent when thesend option is chosen.101
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Setup of a Drift Tube Muon Trackera
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AbstractIn this work the setup and
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3.5.5 Pattern Recognition . . . . .
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viii
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essential for vetoing these events.
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Chapter 2NeutrinosThe standard mode
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However, it did not yet deliver an
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Table 2.1: Neutrino oscillation par
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this assumption, the Standard Solar
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Figure 2.1: Neutrino flux at Earth
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asymmetry between neutrino and anti
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Figure 2.3: Expected ¯ν e energy
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Nb neutrino/fission-11010-2Neutrino
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108−dE/dx (MeV g −1 cm 2 )65432
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Figure 3.3: Setup of the muon track
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zyxModule b.0Module a.0Module b.1Mo
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Figure 3.6: Display of the slow con
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plastic scintillators. To avoid all
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N hitsHitmap Plane 06000h_hitmap0En
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Table 3.4: Data structure for calib
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TDC SpectrumN/[2 Channels]1000800H_
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Table 3.5: List of variables calcul
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with ∆⃗q = ⃗q n − ⃗q n−
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N [a.u.]∆ α (x)2200020000da0Entr
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d[mm]Reco Drift Distances201816H_RE
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N [a.u.]Real DataReal data0.06MCh1E
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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
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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
Page 88 and 89: N/dayAll Triggers vs Time12000h_tim
Page 90 and 91: Reco Hits in Scintillatory [mm]1000
Page 92 and 93: PMTPMTScintillatorPMTPMTFigure 5.16
Page 94 and 95: the CMT data file and the Borexino
Page 96 and 97: Zenith Angle CMT and BX-GL Tracks h
Page 98 and 99: Lateral x Resolution CMT - IDhlatx_
Page 100 and 101: Distance d between CMT and BX-GL Tr
Page 102 and 103: Angular difference αN [arbitrary u
Page 104 and 105: [m]z bxTrack Position in BX x=0 Pla
Page 106 and 107: N [arbitrary units]∆y all data200
Page 110 and 111: Table A.1: Variables that can be se
Page 112 and 113: espectively. The channel numbers ar
Page 114 and 115: xyϕϕ ′βx ′µFigure C.2: Rela
Page 116 and 117: the z-coordinate z op,0 of the firs
Page 118 and 119: xyEvent: 470, Entry: 470, Time Tue
Page 120 and 121: [14] Ch. Kraus et al. Final Results
Page 122 and 123: [49] T. Araki et al. Experimental i
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Page 126: Jan Lenkeit und Björn Wonsak sowie
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