Overview of Far Detector Performance
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Overview of Far Detector Performance. IDS-NF ECFA Review, Daresbury Laboratory. Paul Soler, 5 May 2011. ~15 m. 3 m. n beam. 3 m. High granularity detector. High resolution detector. Mini-MIND. B~1 T. Overview of Detector Session. Detector session will cover three talks:

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Overview of far detector performance

Overview of Far Detector Performance

IDS-NF ECFA Review,

Daresbury Laboratory

Paul Soler, 5 May 2011


Overview of detector session

~15 m

3 m

n beam

3 m

High granularity

detector

High resolution detector

Mini-MIND

B~1 T

Overview of Detector Session

  • Detector session will cover three talks:

    • This talk (P. Soler): Description of far detector baseline (Magnetised Iron Neutrino Detector) and performance

    • A. Bross: MIND detector technology and engineering

    • R. Tsenov: Near Detector performance criteria and status

Near Detector

IDS-NF ECFA Review: 5th May 2011


Baseline for a neutrino factory mind

detector

50-100 m

50%

15 m

wrong

sign

muon

n beam

50%

50-100kT

15 m

B=1 T

iron (3 cm)

+ scintillators (2cm)

Baseline for a Neutrino Factory: MIND

  • Golden channel signature: appearance of “wrong-sign” muons in magnetised iron calorimeter

Magnetic Iron Neutrino Detector (MIND)

IDS-NF baseline for 25 GeV NuFact:

  • Two far detectors:

    • 2500-5000 km baseline: 100 kton

    • 7000-8000 km (magic) baseline: 50 kton

  • Appearance of “wrong-sign” muons

  • Segmentation:

    • 3 cm Fe + 2 cm scintillator

  • 1 T magnetic field

IDS-NF ECFA Review: 5th May 2011


History of wrong sign muon analysis

History of Wrong-Sign Muon Analysis

  • Latest GEANT3 analysis (2009): NIMA 624, (2010) 601 (arXiV:1004.0358)

    • New feature – full reconstruction for the first time

Charge mis-ID

International Scoping

Study (ISS)

NC background

Other important output: full response

(migration) matrices for signal and

background: sensitivity and

systematic studies

IDS-NF ECFA Review: 5th May 2011

Also: ne background ~ 4x10-5


Mind new geant4 analysis

MIND: new GEANT4 analysis

  • Improvements MIND analysis with full GEANT4 simulation

A. Laing, PhD thesis,

University of Glasgow

  • Add quasi-elastics and resonance production (NUANCE)

  • Non DIS processes dominant at low energies

  • Should improve low energy efficiency

Zeller: hep-ex/0312061

IDS-NF ECFA Review: 5th May 2011

Benchmark of NUANCE with data


Mind neutrino event generation

MIND: neutrino event generation

  • Energy smearing with hadronic energy resolution:

  • Digitisation and clustering with ~1cm spatial resolution

Bending plane

Non-bending plane

Front x-y view

IDS-NF ECFA Review: 5th May 2011


Expected neutrino event rates in mind

Expected neutrino event rates in MIND

Event rates 100 kton

MIND at 4000 km

(for 1021m decays)

Need 10-4 bkg

suppression

anti-numu CC

nue CC

anti-nu NC

nu NC

IDS-NF ECFA Review: 5th May 2011


Task 2 mind likelihood analysis

Task 2 MIND: likelihood analysis

  • Curvature error (CC rejection) and NC rejection

Num hits > 150

nm-CC

nm-CC

CC signal

nm-CC

nm-CC

  • Kinematic cuts: Neutrino energy (En=Em+Ehad) vs

IDS-NF ECFA Review: 5th May 2011


Mind cc and nc background

MIND: CC and NC background

  • New analysis with Nuance and GEANT4:

anti-numu as numu

numu as anti-numu

CC background

NC as numu

NC as anti-numu

NC background

IDS-NF ECFA Review: 5th May 2011


Mind n e background and signal

MIND: ne background and signal

  • New analysis with Nuance and GEANT4:

anti-nue as anti-numu

nue as numu

nue background

numu efficiency

anti-numu efficiency

Signal efficiencies

IDS-NF ECFA Review: 5th May 2011


Mind signal efficiency

nm-CC

nm-CC

MIND: signal efficiency

  • Difference in numu and anti-numu efficiencies: effectively only because of Bjorken y distribution (inelasticity) of neutrinos and antineutrinos

IDS-NF ECFA Review: 5th May 2011


Mind signal efficiency1

MIND: signal efficiency

  • New analysis with Nuance and GEANT4: better efficiencies at low energies, due to addition of QES and RES events

IDS-NF ECFA Review: 5th May 2011


Task 2 mind systematic errors

Task 2 MIND: systematic errors

  • Systematic errors: hadronic energy & angular resolution

  • Systematic errors: ratio of QES/DIS, 1p/DIS, “Other”/DIS

IDS-NF ECFA Review: 5th May 2011


Mind future directions

MIND: Future directions

  • Analysis and simulations:

    • Add ntsignal to wrong-sign muon signal – important for sensitivities

    • Move to GENIE for neutrino interactions

    • Improve digitisation, optimise geometry and add toroidal field

    • Hadronic reconstruction: energy and angular resolution

    • New multivariate analysis: sensitivity plots

    • Cosmic backgrounds

IDS-NF ECFA Review: 5th May 2011


Mind realistic geometry

MIND: realistic geometry

  • Dipole field not realistic due to cost of implementation

  • Toroidal field and octagonally shaped detector (as in MINOS) more realistic

    • Fermilab engineers working towards valid engineering solution and magnetic field map

Two detectors

M~50-100 KTon

See A. Bross next talk

IDS-NF ECFA Review: 5th May 2011


Mind since idr

MIND: since IDR

  • Tau neutrino simulations using GENIE already implemented

  • New plots:nt signal right-sign

nutau as numu

anti-nutau as anti-numu

  • New plots:nt signal wrong-sign

anti-nutau as numu

nutau as anti-numu

IDS-NF ECFA Review: 5th May 2011


Mind since idr1

MIND: since IDR

  • Progressing to new simulations using full GENIE simulation

    • Analysis redone using GENIE

    • Importance of Parton Distribution Functions and event generator implementation – source of systematic error

  • Working towards octagonal geometry in simulation:

    • Implemented geometry

    • Need to implement toroidal B-field

Sneak preview

IDS-NF ECFA Review: 5th May 2011


Totally active scintillating detectors tasd

100 m

15 m

15 m

1.5 cm

15 m

3 cm

Totally Active Scintillating Detectors (TASD)

Suitable for Low Energy Neutrino Factory: 5-10 GeV muons

Ellis, Bross

  • 35 kton

  • 10,000 modules

  • 1000 cells per plane

  • Total: 10M channels

Reduction threshold: access second oscillation maximum and electron identification

  • Momenta between 100 MeV/c to 15 GeV/c

  • Magnetic field considered: 0.5 T

  • Reconstructed position resolution ~ 4.5 mm

IDS-NF ECFA Review: 5th May 2011


Totally active scintillating detectors tasd1

Totally Active Scintillating Detectors (TASD)

Neutrino CC reconstructed efficiency

Muon charge mis-ID rate

  • Also: preliminary results suggest ~80% electron detection efficiency but still need to work on electron charge identification

IDS-NF ECFA Review: 5th May 2011


Totally active scintillating detectors tasd2

Totally Active Scintillating Detectors (TASD)

  • Main challenge: magnetisation of huge volume

  • However, possible magnetisation can be achieved using magnetic cavern concept (10 modules with 15m x 15 m diameter)

Use Superconducting Transmission Line (STL)

50 m

Bross

0.58 T at 50 kA

  • R&D needed to develop concept!!

IDS-NF ECFA Review: 5th May 2011


Conclusions

Conclusions

  • Two Magnetised Iron Neutrino Detectors (MIND) at standard Neutrino Factory (25 GeV) is baseline:

    • 2500-5000 km with100 kton mass

    • 7000-8000 km (magic baseline) with 50 kton

  • New analysis with Nuance, Geant4, full pattern recognition and reconstruction achieved, with full migration matrices for GLoBES supplied.

  • Efficiencies higher in the plateau and lower threshold than previous analyses (mainly due to addition of QEL+RES events)

  • Engineering realistic concept well under way (next talk)

  • Totally Active Scintillating Detector (TASD) offers alternative with lower muon threshold and electron identification

    • Main difficulty: magnetisation

IDS-NF ECFA Review: 5th May 2011


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