the no n a experiment status
DESCRIPTION
The NO n A Experiment Status. Leon Mualem California Institute of Technology (for the NO n A collaboration) Workshop on Next Generation Neutrino and Nucleon Detectors 2007 Hamamatsu, Japan. The NO n A Experiment. Uses a 15kT detector, NO n A Positioned off axis of the Fermilab NuMI beam - PowerPoint PPT PresentationTRANSCRIPT
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Leon Mualem — NNN07
The NOA Experiment Status
Leon MualemCalifornia Institute of Technology
(for the NOA collaboration)
Workshop on Next Generation Neutrino and Nucleon Detectors 2007
Hamamatsu, Japan
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Leon Mualem — NNN07
The NOA Experiment
• Uses a 15kT detector, NOA
• Positioned off axis of the Fermilab NuMI beam
• Run for 6 years
• Goals:– Observation of the transition e
– Measurement of 13 to factor of ~2
– Measurement of sin2(223)
– Determination of mass hierarchy (sign of m223)
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The NOvA Collaboration
25 Institutions, 129 Physicists and EngineersArgonne, Athens, Caltech, College de France, Fermilab, Harvard, Indiana, ITEP-
Moscow, Michigan State, Minnesota, Minnesota-Duluth, Munich, Northern Illinois, Ohio State, Rio de Janeiro, South Carolina, Southern Methodist University, Stanford,
Stonybrook, Texas, Texas A&M, Tufts, UCLA, Virginia, William and Mary
Leon Mualem — NNN07
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Approximate Schedule• Apr 2006: US DOE CD-1 review. Recommends approval• Sep 2007: Cooperative Agreement signed• Oct 2007: US DOE CD-2/3A review
– Baseline, advanced procurement• Nov 2008: Prototype Near detector ready• Mar 2010: Beneficial Occupancy of the FD building
– Outfitting and installation begins• Oct 2010: 9 month shutdown for accelerator upgrades• Jun 2011: First Superblock Ready (~2.5kT)• Aug 2011: 400kW beam commissioning• April 2012-Jul 2012: Shutdown for upgrades to 700kW
beam commissioning• Dec 2012: Far Detector completed
Leon Mualem — NNN07
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Leon Mualem — ICHEP06
Fermilab NuMI Beam
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Leon Mualem — NNN07
Off-Axis beam features
• Narrow energy distribution
• Tuned Energy by selecting off-axis angle– Maximize νe
appearance– Minimize νμ
• Higher Intensity at a given energy
• Suppressed high energy tail– Reduces NC
contamination
—NUMI-On-axis beam—14mrad off-axis beam
(no oscillation)
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Proton Plans and Possibilities
Leon Mualem — NNN07
Project X
2300
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Leon Mualem — NNN07
Site for Far Detector: Ash River, MN
• This site is at 810 km from Fermilab, 11.77 km off-axis• Farthest available site in the U.S. along the NuMI beam
– US 53, St. Louis County Road 129 - all weather access
Ash River
Minneapolis
Duluth
International Falls
Fermilab
Ash River
Minneapolis
Duluth
International Falls
Fermilab
Ash River
VoyageursNational Park(shaded brown)
Ash River
VoyageursNational Park(shaded brown)
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15.4m
15.4m
70m
Leon Mualem — NNN07
NOA Far Detector
15 ktons
15.4m x 15.4m x 70m
1003 liquid scintillator planes, (~80% active)
Scintillator cells 3.8 x 6.0 x 1540 cms
Read out from one side per plane with APDs
Expected average signal at far end of 30pe
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Leon Mualem — NNN07
The Basic Detector element• Liquid Scintillator
• 5.5% pseudocumene as scintillant• Mineral oil and waveshifters (PPO, bis-MSB)
• PVC cell for primary containment• Horizontals:3.87 cm x 6.0 cm x 15.4 m long• Verticals: 3.76 cm x 5.7 cm x 15.4 m long• Highly reflective, 15% titanium dioxide
• Looped wavelength shifting fiber to collect light• 0.7 mm diameter, double clad, K27 waveshifter• Almost perfect mirror, 3.6*light in 1 fiber
• Avalanche Photodiode • 85% quantum efficiency• Gain of 100, operate at -15oC
• Low noise amplifier
To 1 APD pixel
W D
typicalchargedparticle
path
L
To 1 APD pixel
W D
typicalchargedparticle
path
L
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Technical Progress
IPND extrusions at manufacturer
• Things are happening
• Prototype Extrusions have been made
• Prototype Photodetectors and readout electronics delivered
Leon Mualem — NNN07
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APD Photodetector
• Hamamatsu Si Avalanche Photodiode (APD)– Variant of commercial
S8550 SiAPD– Custom design to
match to fiber aspect ratio
– Bare die mounted to PCB via gold bump thermo-compression
Leon Mualem — NNN07
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APD Advantage
Wavelength (nm)
85% QEMatches fiber Emission
Leon Mualem — NNN07
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Front End Board
• Low-Noise ASIC
• External ADC (AD41240)
• FPGA, control and DSP
ASIC ADC FPGA
Leon Mualem — NNN07
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Leon Mualem — NNN07
e CC event
epe-p+
E=2.5GeV
Ee=1.9GeV
Ep=1.1GeV
E=0.2GeV
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Leon Mualem — NNN07
CC event
• 2GeV muon CC event
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Leon Mualem — NNN07
CC event
n-n+o
E=2.8 GeV
E=0.5GeV
En=1.0GeV
E+=0.4GeV
Eo =1.8GeV
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Leon Mualem — NNN07
NC event
Npo
E=10.6 GeV
Ep=1.04GeV
Eo =1.97GeV
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Current Analysis Results• Completely new analysis written in new framework
(transition from Fortran to C++)• New reconstruction algorithms • New event selection algorithms• New analysis at least as powerful as previous.
• Increases e selection efficiency
• New simulation codes – Upgrades to neutrino interaction code– Upgrades to flux model– increases background (may overestimate)
Leon Mualem — NNN07
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Electron Identification for NOvA
~20 variables in Neural Net
Example distributions
Overall efficiency ~30% (optimizable)
ANN Output
signal
signal
signal
bkg.
NC
NC
CC
CC
CC
beam e
Leon Mualem — NNN07
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Detector Performance
• Optimize Figure of Merit (FOM=sig/√bkd) performance separately for and anti-
• Use 18E20 POT, sin2(213) =0.1, m2=2.4E-3, no matter effects
• Upgrades to neutrino event generator
• Updates to predicted neutrino flux
• Updated detector mass and configuration– 15kT, slightly shorter modules, photodetector readout
Leon Mualem — NNN07
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Performance optimization
Leon Mualem — NNN07
Neutrino Figure of merit (sig/√bkd)Maximized at 15.3, and26% selection efficiency
Anti-Neutrino Figure of merit (sig/√bkd)Maximized at 9.5, and20% selection efficiency
Combined Figure of merit 18.0
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3 Sensitivity to sin2(213) ≠ 0
Sensitivity vs for non-zero sin2(213) at 700kW, 1.2MW, and 2.3MW
Leon Mualem — NNN07
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Leon Mualem — NNN07
Mass Hierarchy Resolution
If you assume a measurement of P(νe)=0.02, what does that imply about θ13 and the mass hierarchy, and how can you distinguish them.
Determine P using anti-neutrinos and/or measure θ13 in reactor experiment.
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95% CL Sensitivity tothe Mass Ordering
Inverted
Normal
Leon Mualem — NNN07
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Leon Mualem — NNN07
Measurement of sin2(223)
If sin2(223) = 1, then it can be measured to 0.004.
Otherwise, it can be measured to~0.02.
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Summary
• Progress in many areas– Reviews and administrative milestones and
achievements– Technical – production of prototype detectors– Analysis
• Development of new reconstruction
• Development of new event selection
• More improvements possible; this area is under active development
Leon Mualem — NNN07
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Conclusions
• The NOA experiment exhibits significant sensitivity to the current and future issues of neutrino oscillations– Electron neutrino appearance -- sin2(213)
– Muon neutrino disappearance -- sin2(223)
– mass hierarchy resolution– CP violation measurement
• Upgraded beam intensity needed to reach all of these goals
• Final thanks to NOA Collaborators for their contributions
Leon Mualem — NNN07