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Detector Basically the NOvA detector. Planes of plastic tubes filled with liquid scintillator. Fully active: Good for electron identification Total mass: 30 kilotons. 150m long, 15.7m x 15.7 m. Surrounded by coils providing a magnetic field. Use the ATLAS toroid coils as examples. The advantage over a magnetic iron detector is that it also gives us a handle on the momentum and charge of the hadrons as well as those of the muons. NOMAD was a successful magnetic detector that used this principle.
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Detector concept: End view Detector Coil Return yoke
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Detector concept: Side view 10 coils per side
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More details ATLAS has 8 rectangular coils each 25m x 5m. Superconducting. 120 turns per coil 20.5 kA Field at centre 0.41 T Cost is 75 MCHF NOvA is 15m high, so lets’s modify the coil to 15m x 15m same circumference NOvA is ~ 150m long, so we would need 10 coils on either side 20 coils We don’t need such a big field for the charge: drop it to 0.15T. Reduce the number of turns/coil. Does the decrease in number of turns compensate the increase in number of coils? Do we need a superconducting setup? With such a small field and with iron saturating at about 1.8T, the cross section of the return yoke need only be 25m x (15m x 0.15/1.8) ~ 25m x 0.75m per coil pair
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Performance Each tube: 15.7m long, 3.8cm transverse to the beam, 6cm along the beam. Precision per coordinate 3.8 / (12) 1/2 = 1.2 cm. Track length given by muon range, but taken to be maximum of 50m. Momentum(GeV/c)Range(m)Curvature(1/R) m -1 # Stand. dev 2 10.4 0.06 5.6 6 29.7 0.02 10.0 10 48.2 0.012 13.0 20 92.6 0.006 13.0 30 135.7 0.004 13.0 50 219.2 0.0024 13.0
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