Experiment Proposal - opera - Infn

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disassembled to read out tracks Repeat ∆x measurements along a track emulsion film Pb plate require precise alignment a position obtained as a mean of those on both surfaces of the emulsion film displacement ∆x unit cell L=1300micron Figure 115: The coordinate method to measure multiple scattering is schematically shown. For this purpose, 3 films have be precisely aligned over a small film surface. 152
Figure 116: The top histograms show the position resolution of the UTS as obtained in DONUT. It is evaluated as residuals from a straight line fitted to penetrating tracks. These tracks pass through 9 Fe plates (1 mm thick) and 9 emulsion films. Since most of the tracks are due to beam muons with a wide momentum spread, multiple scattering effects affect the distributions. A two-Gaussian fit shows the presence of a narrow component with a resolution of 0.06 µm. The bottom histogram shows the variation of these RMS among the different emulsion films. 153
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CERN/SPSC 2000-028 SPSC/P318 LNGS P
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N. Bruski, S. Buontempo, F. Carbona
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Contents 1 Introduction 5 1.1 Physi
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6.7.1 Multiple scattering analysis
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1 Introduction In this document we
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eactor experiments (KAMLAND [22], B
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difference being the nature of the
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The total energy of electrons and
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through the decay topology and its
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Figure 6: Simulated ν τ event wit
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particles above 10 MeV . One can se
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vertex position as predicted by the
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• stability and maintenance: no p
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Figure 11: Illustration of the vari
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Table 3: Expected numbers of τ and
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3 The CNGS neutrino beam 3.1 The be
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per year of operation because the S
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ν µ at GS (p.o.t. GeV m 2 ) -1 10
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Figure 19: Generated (continuous li
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Emulsion Film + 56 (Lead + Emulsion
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The mechanical properties of the fi
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Figure 24: Film thickness distribut
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contact at different temperature an
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Figure 27: Photograph of a minimum
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entry : 85 RMS: 0.060 15 10 5 0 0 d
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[micron] 2 1 0 -1 -2 [micron] 2 1 0
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een searching for old emulsion plat
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Figure 33: Thickness distribution f
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Figure 35: RMS distribution of 472
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Figure 37: Wall support structure.
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ensures a well defined brick positi
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Figure 41: Detail of the brick mani
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The strips are 6.7 m long, 2.6 cm w
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the effective maximal length (for p
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Table 7: Characteristics of the 64-
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photomultiplier to be tested diaphr
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modate from 512 up to 5180 fibres.
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The fast shaper has a high gain in
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The Ethernet capable device provide
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R&D already performed by the MINOS
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Figure 54: Isometric view of the di
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Figure 56: Magnetic field distribut
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RPC layout 8.00 m 8.75 m Figure 58:
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formance, it is presently foreseen
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Figure 61: Drift plane arrangement
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Figure 63: Schematic view of a XPC
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Figure 64: Acceleration spectrum fo
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Figure 65: The OPERA detector shown
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Table 9: Number of electronic chann
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Adjustable gain Channel 0 Sample &
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Trigger OUT IN Discri. Time Ref. PP
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Super Module 1 Super Module 2 Super
Page 105 and 106: 5 Analysis of the electronic detect
Page 107 and 108: Track segments on both the emulsion
Page 109 and 110: 5.5 Brick finding efficiency The se
Page 111 and 112: Wall finding efficiency 1 0.95 0.9
Page 113 and 114: The worst case leading to the lowes
Page 115 and 116: electromagnetic showering events an
Page 117 and 118: Studies on the strategies have star
Page 119 and 120: which may enter in such a compariso
Page 121 and 122: Figure 84: The total brick finding
Page 123 and 124: Figure 86: Charge determination of
Page 125 and 126: Figure 89: Muon momentum resolution
Page 127 and 128: Figure 91: Muon momentum resolution
Page 129 and 130: Reconstructed Pion Energy N Analog
Page 131 and 132: Figure 98: The difference between r
Page 133 and 134: By using the above running modes of
Page 135 and 136: µm EXP.: DONUT 3039/01910 MOD.:ECC
Page 137 and 138: emulsion film plastic foils and edg
Page 139 and 140: 200micron base 50micron emulsion la
Page 141 and 142: Figure 106: Tracking efficiency of
Page 143 and 144: a base track on film 2 a penetratin
Page 145 and 146: Long decays, defined as a decay top
Page 147 and 148: more than 60 views/s recognising al
Page 149 and 150: Table 12: Basic numbers used to des
Page 151 and 152: an area that one S-UTS can process
Page 153 and 154: unit cell L=1300micron Pb plate ( 1
Page 155: We recall that the intrinsic positi
Page 159 and 160: The error on θ S due to both the s
Page 161 and 162: Figure 120: Fraction of pions which
Page 163 and 164: #1 #2 #3 #4 #5 γ γ ∆θ 4= |θ 5
Page 165 and 166: Figure 124: Energy resolution for e
Page 167 and 168: Figure 126: Efficiency for γ’s t
Page 169 and 170: 7 Physics performance 7.1 Electron
Page 171 and 172: 7.2 Muon identification efficiency
Page 173 and 174: Table 13: Muon identification effic
Page 175 and 176: Table 14: Brick finding efficiency
Page 177 and 178: The second result is obtained from
Page 179 and 180: Figure 134: Brick-to-brick connecti
Page 181 and 182: Figure 136: Distribution of τ deca
Page 183 and 184: For long decays the overall efficie
Page 185 and 186: The φ angle is expected to peak at
Page 187 and 188: Table 19: Summary of the kinematica
Page 189 and 190: known. Because of these uncertainti
Page 191 and 192: Table 21: Expected charm background
Page 193 and 194: π− e+ γ e- e+ e- γ π− Figur
Page 195 and 196: Table 24: Estimates of the rate of
Page 197 and 198: Table 27: Expected numbers of τ an
Page 199 and 200: Table 28: Sensitivity at the 90% CL
Page 201 and 202: 7.6 Determination of the oscillatio
Page 203 and 204: measurement of the ratio between ν
Page 205 and 206: Table 30: Neural network recognitio
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(mrad) 0.04 0.02 0 -0.02 -0.04 10 2
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Table 31: Radioactivity measurement
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ick. There is approximately a facto
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Figure 152: A typical PMT response
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1m π, µ 15 GeV/c mini-walls 1.6 m
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Electrons 1GeV/c 20mm Pb Number of
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tube. An Image Intensifier (II) by
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1 0 0 l = 1 1 .8 m N, p.e. 1 0 1 0
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HPD’s pixels (Fig. 162). The cook
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A complete system has been designed
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The acquisition system (VA-DAQ) use
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The upstream tracker T 1-3 between
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Figure 168: Distributions of the ap
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Figure 169: Example of a large-angl
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multiple scattering, given the smal
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9.1.3 Wall support structures An al
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Nevertheless, the possibility to us
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Figure 174: (a) 3D view of the spec
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9 p.e. and 6.9 p.e. at a distance f
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Figure 176: Neutrino induced charm
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A test programme for emulsion brick
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The space requirements in the exper
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advance. The sets of scintillator s
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Task Name Start Finish Study of mai
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11 Experimental infrastructure 11.1
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After the exposure to cosmic rays,
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on the size of these stations. A co
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Table 38: Expected contributions to
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the developed emulsions and to stan
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As the sensitivity is not limited b
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[26] M. Apollonio et al., Phys. Let
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[89] http : //tosca.web.cern.ch/T O
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