Neutrino Detectors for future facilities - III
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1 Neutrino Detectors for future facilities - III Mark Messier Indiana University NUFACT Summer school Benasque, Spain June 16-18,
2 Neutrino detectors optimized for muons reconstruction νμ νμ and the Golden Channel νe νμ 2
3 Why magnetize? Containment: A magnetic field can keep muons from exiting the sides of your detector Momentum measurement: If the muon does exit your detector, the curvature of the track tells you the momentum even when you couldn t otherwise get it from the range of the particle Charge sign: There are physics measurements in knowing the charge sign of the muons in your detector. Crucial for the golden channel at a neutrino factory: µ + e + ν µ ν e ν µ ν µ ν e ν µ F µ +/F µ! BESS L3C MINOS p µ [GeV/c] Cosmic-ray μ+/μ- ratio ν µ + A µ + + X ν µ + A µ + X production oscillation detection wrong sign! 3
4 The MINOS Detectors MINOS uses two functionally equivalent detectors: 2.54 thick magnetized steel plates 4.1 x 1 cm co-extruded scintillator strips optical fiber readout to multi-anode PMT s 5.4 kton 8 x 8 x 30 m 484 steel/scintillator planes M16 PMT, x8 multiplexing VA electronics 1 kton 3.8 x 4.8 x 15 m 282 steel, 153 scintillator planes M64 PMT Fast QIE electronics 4
5 scintillator modules layered on steel plane strong back. Removed after plane is hung in place 5
6 steel plate MINOS Detector 6
7 MINOS scintillator system Single strip muon hit efficiency Single sided: ε=1-exp(-4) = 98% Double sided: ε=1-exp(-8) = 99.97% 7
8 Magnetic field in MINOS 15.2 ka-turn total current 80 A supply 10 gauge copper wire, water cooled 8
9 MINOS Event 9
10 Track momentum using curvature A particle with momentum p, traveling through a constant transverse magnetic field B will travel on a circle of radius ρ p[gev/c] = B[T]ρ[m] ρ = l2 8s + s 2 p 0.3 Bl2 8s Measurement of sagitta and chord gives you momentum. Detector resolution on sagitta is the same as the momentum resolution: δp p = δs s ρ l B k = 1 ρ s ρ μ More common to talk about the track curvature which has roughly Gaussian errors. 10
11 Curvature errors for multiple position samples The uncertainty in curvature for a track which travels a distance L in a magnetic field B whose position is sampled N times at uniform intervals with a position uncertainty ε has been worked out by Gluckstern [NIM 24 (1963) ]: σ 2 k,r = ɛ2 L N +5 Notice relative importance of L and ε K = = Gluckstern has also worked out the contribution to the uncertainty in the curvature from multiplescattering: σk,m.s. 2 = KC N L K is the RMS projected multiple scattering angle per unit thickness x θ 0 3x 13.6 MeV 1 z [ ln(x/x 0 )] βcp 3xX 0 CN is a constant from lookup table. CN=1.43 for large N. - x is the distance traveled in the medium - z is the charge of the particle 11
12 How well do we measure track curvature? - k determines how well the track curvature, and hence sign is known σ k k=0 k = 0.3B? k p k<0 B - + B k>0 + σ k σ 2 k = σ 2 k,r + σ 2 k,m.s. - + k σ k = ( 720ɛ 2 p 2 L 4 (N+5) C N 0.3B p 2 +m 2 xx 0 ( log x X 0 ) ) units: [T], [GeV], [m] k/σk (arbitrary units) Remember : L p, N p, and x p - High field - Small ε - Large L (low Z to keep de/dx low and range high) - Large X0 (low Z) - Just right momentum (see plot at left) p (arbitrary units) 12
13 MINOS Track curvature A. Weber, The MINOS Experience, Golden 07, Valencia, Spain June
14 MINOS anti-neutrino spectrum A. Weber, The MINOS Experience, Golden 07, Valencia, Spain June
15 MINOS charge sign selection efficiency A. Weber, The MINOS Experience, Golden 07, Valencia, Spain June Not optimized for a neutrino factory analysis 15
16 MIND detector concept for a neutrino factory (Magnetized Iron Neutrino Detector) Anselmo Cervera Villanueva, Golden kton MINOS-like detector 1 40 kton module: MINOS 16
17 Backgrounds to the golden channel Anselmo Cervera Villanueva, Golden 07 17
18 Backgrounds in MIND detector arxiv: v1 Q t = p μ sinθ μh measures separation between muon and hadron shower 18
19 How well do we measure track curvature? - k determines how well the track curvature, and hence sign is known σ k k=0 k = 0.3B? k p k<0 B - + B k>0 + σ k σ 2 k = σ 2 k,r + σ 2 k,m.s. - + k σ k = ( 720ɛ 2 p 2 L 4 (N+5) C N 0.3B p 2 +m 2 xx 0 ( log x X 0 ) ) units: [T], [GeV], [m] k/σk (arbitrary units) Remember : L p, N p, and x p - High field - Small ε - Large L (low Z to keep de/dx low and range high) - Large X0 (low Z) - Just right momentum (see plot at left) p (arbitrary units) 19
20 Magnetized TASD? 25 kton NOVA-like detector 15m x 15m x 100m constructed entirely from MINERvA -like solid scintillator 0.5 T magnetic field arxiv: v1 Charge identification efficiency Charge mis-id rate 20
21 How to magnetize a large volume? Creation of large magnetic fields in a large volume are conceivable if one can sustain a large DC current in transmission lines lining the cavern walls Assuming solenoid: n = B µ 0 I = 1T (4π 10 7 T m A )(100 ka) = 8 turns m U = 1 2 = 1 2 B 2 µ 0 V ( 1 2 [T])2 4π 10 7 T m A = 1 GJ = 300 kw hr (20 m 20 m 20 m) Compare to CMS: 2.7 GJ Cost: Scaling from previous magnets ranges from $20M to $60M 21
22 How to magnetize a large volume? Creation of large magnetic fields in a large volume are conceivable if one can sustain a large DC current in transmission lines lining the cavern walls Assuming solenoid: n = B µ 0 I = 1T (4π 10 7 T m A )(100 ka) = 8 turns m U = 1 2 = 1 2 B 2 µ 0 V ( 1 2 [T])2 4π 10 7 T m A = 1 GJ = 300 kw hr (20 m 20 m 20 m) Compare to CMS: 2.7 GJ Cost: Scaling from previous magnets ranges from $20M to $60M FERMILAB-CONF TD Superconducting transmission line developed for VHLC magnets at FNAL. Held 100 ka DC operating at Lq HE temperatures. 21
23 Concepts for large, magnetized, LqAr detectors Coil Andre Rubbia, Golden 07 Iron yoke 22
24 23
25 Challenges to magnetized LqAr (my opinion) Need to minimize E B drifts become extremely complicated or electron Many LqAr detector concepts use photomultiplier tubes to detect scintillation light to form trigger and T0. To function, the PMT s must be well shielded from magnetic field. Long wires, high voltage, strong magnetic fields: need to control oscillations very well 5 cm distortion over ~1 m drift in a gas Ar TPC (MIPP) due to ExB effects 24
26 Summary Basics of neutrino event topology Muons: Long, penetrating tracks EM showers: Short, compact Hadron showers: Short, diffuse Detectors optimized for electron neutrinos Water Cherenkov: Excellent performance for 1-ring events NOvA ( TASD ): Segmented solution for higher neutrino energies LqAr: Active R&D program. Great promise for the future Detectors optimized for muon neutrinos MINOS: Optimized for muon neutrino detection in few GeV range MIND: Pushing MINOS technology to high mass TASD w/ B field: The possibilities with magnetized caverns LqAr w/ B field: Pushing the envelope! 25
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