leon mualem — nnn07 the no a experiment status leon mualem california institute of technology (for...

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


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)

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


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 — ICHEP06

Fermilab NuMI Beam


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)

Proton Plans and Possibilities


Project X

2300


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)

15.4m

15.4m

70m


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


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

Technical Progress

IPND extrusions at manufacturer

• Things are happening

• Prototype Extrusions have been made

• Prototype Photodetectors and readout electronics delivered


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


APD Advantage

Wavelength (nm)

85% QEMatches fiber Emission


Front End Board

• Low-Noise ASIC

• External ADC (AD41240)

• FPGA, control and DSP

ASIC ADC FPGA



e CC event

epe-p+

E=2.5GeV

Ee=1.9GeV

Ep=1.1GeV

E=0.2GeV


CC event

• 2GeV muon CC event


CC event

n-n+o

E=2.8 GeV

E=0.5GeV

En=1.0GeV

E+=0.4GeV

Eo =1.8GeV


NC event

Npo

E=10.6 GeV

Ep=1.04GeV

Eo =1.97GeV

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)


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


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


Performance optimization


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

3 Sensitivity to sin2(213) ≠ 0

Sensitivity vs for non-zero sin2(213) at 700kW, 1.2MW, and 2.3MW



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.

95% CL Sensitivity tothe Mass Ordering

Inverted

Normal



Measurement of sin2(223)

If sin2(223) = 1, then it can be measured to 0.004.

Otherwise, it can be measured to~0.02.

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


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 the no a experiment status leon mualem california institute of technology (for...

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