Numi off axis experiment
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NuMI Off-Axis Experiment. Alfons Weber University of Oxford & Rutherford Appleton Laboratory EPS2003, Aachen July 19, 2003. Content. What is the physics? Why off-axis? The beam The site What experiment to build? Scintillator Resistive plate chambers (Liquid Argon) Sensitivity.

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NuMI Off-Axis Experiment

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Numi off axis experiment

NuMI Off-Axis Experiment

Alfons Weber

University of Oxford &

Rutherford Appleton Laboratory

EPS2003, AachenJuly 19, 2003


Content

Content

  • What is the physics?

  • Why off-axis?

    • The beam

    • The site

  • What experiment to build?

    • Scintillator

    • Resistive plate chambers

    • (Liquid Argon)

  • Sensitivity


What is the physics

What is the Physics?

  • Precision Experiment to determine

    • m23

    • sin2223

  • Look for sub-dominant oscillation mode

    • sin213

    • Needed: low background

      • Low e beam contamination

      • Few wrong energy neutrinos


Why off axis

Why Off-Axis

NC (visible energy), no rejection

nm spectrum

NuMI beam can produce 1-3 GeV intense beams with well defined energyin a cone around the nominal beam direction

ne background

ne (|Ue32| = 0.01)


Possible sites

Canada

U.S.

Soudan

L. Superior

Possible Sites

  • NuMI beam

    • 120 GeV protons from FNAL main injector

    • 3-15 GeV neutrinos

    • 3.8x1020 PoT / year

    • 0.5 MW beam power

  • Baselines

    • 700-950 km

  • Several sites with infrastructure

    • Road

    • Electricity

    • Network


Experimental challenge

Experimental Challenge

  • Small signal

    • huge # NC

  • Surface detector

    • No or light over-burden

    • cosmic 

    •  induced n

    • But:Duty factor 10-5


Detector challenge

Detector Challenge

  • NC versus Electron CC separation

    • Fine grain

    • Low Z

  • Build affordable & massive detector

    • 50+ kton fiducial mass

    • >400k readout channels

  • Technologies:

    • Solid scintillator (MegaMINOS, but not Mton)

    • Liquid scintillator

    • Glass RPCs

    • (Liquid Argon TPC)


Solid liquid sintillator

Solid/Liquid Sintillator

  • Alternating horizontal and vertical scintillator planes

  • Passive material: woodOriented Strand Board (density .6 - .7 g/cm3)

  • Sampling: 1/3 rad. length

Fiducial fraction (1 m cut at all edges) 80%

readout

15 m

180 m

readout

readout

9.4 tons

6 = 1 plane

5300 = detector

48 ft

15 m

15 m

885 planes = detector

8 in

Scintillator

modules

4 ft

8 ft

8 ft


Scintillator and wls fibre

MINOS WLS Fiber

Relative Light Yield

Length in cm

Scintillator and WLS Fibre

  • Scintillator Length 15 m

    • Looped fibre readout

  • Scintillator Material

    • Solid

      • MINOS like co-extruded (3.8x1 cm2)

    • Liquid

      • Bicron 517 L (3.8x2.9 cm2)

  • WLS Fiber

    • Kuraray (0.7 mm ø)

  • Photodetector

    • APD

    • PMT: M64

400,000 m2

( 16 x MINOS)

( 2 x MINOS)

680,000 channels

( 30 x MINOS)


Glass rpcs lsts

Glass RPCs / LSTs

  • Used successfully

    • Belle: 4 years operation

    • Virginia Tech: 5 years testing

Wood/plastic absorber


Signal bg events

Signal & BG Events

typical signal event

BG event

Fuzzy track = e-

Clean track = muon

2 tracks = π0


Physics reach i

Phase I (2008-2014)

4x1020 PoT / year

50 kton detector (fiducial)

1.5 years neutrinos

5 years anti-neutrinos

Phase II (2014-2020)

A factor of 25 more:PoT x detector mass

1.5 years neutrinos

5 years anti-neutrinos

Physics Reach (I)


Physics reach ii

Physics Reach (II)

  • Some Math:

  • need more than one experiment to determine oscillation parameters

P (nm ne) = P1 + P2 + P3 + P4

A. Cervera et al., Nuclear Physics B 579 (2000) 17 – 55, expansion to second order in


Physics reach iii

Physics Reach (III)

  • Measurement is oscillation probability

  • Depends simultaneously on:

    • Mass hierarchy

    • CP phase

    • Mixing angles

Typical Errors


Summary

Summary

  • The NuMI OA group is seriously trying to bring froward a credible & affordable proposal

  • Combination of

    • JPARC/SuperK and NuMI OA

    • neutrino and anti-neutrino running

  • might reveal neutrino mixing parameters

    • Masses & hierarchy

    • Angles

    • CP phase

  • For more information:

http://www-off-axis.fnal.gov


Liquid argon tpc

Liquid Argon TPC

  • Excellent pattern recognition capabilities

  • High efficiency for electron identification

  • Excellent e/p0 rejection


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