The NOvA Test Beam Program ANDREW SUTTON ON BEHA LF OF THE NO V A - - PowerPoint PPT Presentation

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The NOvA Test Beam Program ANDREW SUTTON ON BEHA LF OF THE NO V A - - PowerPoint PPT Presentation

Dec 29, 2022 314 likes •532 views

The NOvA Test Beam Program ANDREW SUTTON ON BEHA LF OF THE NO V A C OLL ABORATION The NOvA Experiment N uMI O fg-Axis e A ppearance Uses the most powerful muon neutrino beam (> 700 kW) Two functionally equivalent tracking

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SLIDE 1

The NOvA Test Beam Program

ANDREW SUTTON

ON BEHA LF OF THE NO VA C OLL ABORATION

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SLIDE 2

ANDREW SUTTON 2 810 km

The NOvA Experiment

  • NuMI Ofg-Axis νe

Appearance

  • Uses the most powerful muon neutrino beam (> 700 kW)
  • Two functionally equivalent tracking calorimeters

‒ Near Detector: 300 ton underground ‒ Far Detector: 14 kiloton on the surface

  • Measure ν

µ (ν µ

) disappearance and ν

e (ν e

) appearance

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SLIDE 3

ANDREW SUTTON 3

NOvA Physics Goals

  • Mass ordering (is ν

3 the heaviest mass state?)

‒ ordering efgects oscillations in matter

  • Is the θ23 mixing angle 45°? (underlying ν

µ

/ν

τ symmetry)

  • Probe CP violation in the lepton sector

‒ compare neutrino and anti-neutrino beams

  • Sterile neutrinos, exotic searches, neutrino cross-sections

Normal Hierarchy Inverted Hierarchy

M.A. Acero et al. (NOvA) arXiv:1906.04907 (2019)

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SLIDE 4

ANDREW SUTTON 4

Detector Technology

  • PVC tubes fjlled with liquid scintillator
  • Alternating horizontal and vertical planes for 3D tracking
  • Cells contain a loop of wavelength shifting fjber to collect light
  • Fibers are viewed by an avalanche photodiode (APD)

3.9 cm 6.0 cm

Far Detector Near Detector Test Beam

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SLIDE 5

ANDREW SUTTON 5

NOνA Analysis Method

  • Use through going and stopping muons to calibrate and set the

relative and absolute energy scales

  • Convolutional Visual Network event classifjer to identify

interaction type (νe, νμ, NC)

‒ Tuned using simulation

  • Apply a containment cut
  • Cosmic rejection

‒ Far detector is on the surface. ~O(1010) cosmic rays per day

  • Energy reconstruction by particle type

‒ Muon energy determined from track length and dE/dx ‒ Electromagnetic and hadronic energy is measured calorimetrically

νμ candidate

hadron muon

νe candidate

EM hadron

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SLIDE 6

ANDREW SUTTON 6

Why a Test Beam?

  • Test beams provide tagged single particles to study

detector response

  • As we take more data the statistical limitations decrease

making systematics more important

  • The largest uncertainties can be directly investigated
  • Test new calibration methods

‒ Currently use cosmic muons to set the relative and absolute energy scales ‒ Calibrate hadrons directly?

  • Improve simulation
  • Build a single particle library to develop reconstruction

algorithms

Numu selected FD spectrum

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SLIDE 7

ANDREW SUTTON 7

https://www.fnal.gov/pub/science/particle-accelerators/images/accel-complex-animation.gif

Fermilab Test Beam Facility

  • Utilize the FTBF MCenter Beamline (LArIAT used this

beamline prevously)

  • 120 GeV protons from main injector produce a 8-80 GeV

secondary beam of primarily protons and pions

  • Secondary beam then produces a tertiary beam of pions,

protons, electrons, muons, and kaons

‒ Use a bending magnet to select particles from 0.2-2 GeV/c

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SLIDE 8

ANDREW SUTTON 8

Beamline

  • Tunable beam of protons and pions incident on Cu

target generates tertiary beam

Secondary Beam

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SLIDE 9

ANDREW SUTTON 9

Beamline

  • Tunable beam of protons and pions incident on Cu

target generates tertiary beam

  • Time of fmight (TOF) system to tag heavy particles (p,K)

Secondary Beam

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SLIDE 10

ANDREW SUTTON 10

Beamline

  • Tunable beam of protons and pions incident on Cu

target generates tertiary beam

  • Time of fmight (TOF) system to tag heavy particles (p,K)
  • Multi-wire proportional chambers (MWPCs) to measure

defmection angle through Magnet

Secondary Beam

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SLIDE 11

ANDREW SUTTON 11

  • Cherenkov counter (1 atm CO2) to distinguish electrons

from muons and pions

Beamline

  • Tunable beam of protons and pions incident on Cu

target generates tertiary beam

  • Time of fmight (TOF) system to tag heavy particles (p,K)
  • Multi-wire proportional chambers (MWPCs) to measure

defmection angle through Magnet

Secondary Beam

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SLIDE 12

ANDREW SUTTON 12

  • Tunable beam of protons and pions incident on Cu

target generates tertiary beam

  • Time of fmight (TOF) system to tag heavy particles (p,K)
  • Multi-wire proportional chambers (MWPCs) to measure

defmection angle through Magnet

Beamline

  • Cherenkov counter (1 atm CO2) to distinguish electrons

from muons and pions

  • Measure response of the NOvA Detector

Secondary Beam

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SLIDE 13

ANDREW SUTTON 13 Secondary Beam

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SLIDE 14

ANDREW SUTTON 14

Test Beam Detector

  • Functionally identical to the Near and Far detectors
  • Outfjtted with FD and ND electronics to compare readouts

‒ The two main detectors have difgerent versions of the readout boards

  • The fjrst half of the detector has been fjlled with scintillator, second half

will be fjlled over summer shutdown Cosmic event top view side view

FD: 344,064 channels ND: 20,192 channels TB: 4,032 channels

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SLIDE 15

ANDREW SUTTON 15

Commissioning

* Very preliminary PID plot

  • Detector and beamline fully installed by May 26th
  • Fermilab summer shutdown started July 6th

‒ May and June Fermilab AD operated on a bi-weekly basis

  • Used the time to tune the secondary beam and commission

beamline and main detector

/c

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SLIDE 16

ANDREW SUTTON 16

Commissioning

top view side view

Beam direction

  • Matching beamline and detector events

‒ Proton candidate ‒ Entered ~ 0, 0, 0 ‒ Stopped in the detector ‒ Measured ToF: 58.5 ns ‒ Reconstructed momentum: 1.10 GeV/c

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SLIDE 17

ANDREW SUTTON 17

Commissioning

top view side view

Beam direction

  • Matching beamline and detector events

‒ Proton candidate ‒ Entered ~ 0, 0, 0 ‒ Stopped in the detector ‒ Measured ToF: 58.5 ns ‒ Reconstructed momentum: 1.10 GeV/c

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SLIDE 18

ANDREW SUTTON 18

Current Status and Future Plans

  • Continue to commission the beamline detectors with radiation sources and cosmics
  • The main detector will take cosmics for calibration
  • Fill the second half of the detector
  • Resume data collection when beam returns
  • Analyze and apply results
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SLIDE 19

ANDREW SUTTON 19

Thanks!

  • 7 postdocs, 11 grad students, and 11 undergrads (and a few professors)

This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Workforce Development for Teachers and Scientists, Office of Science Graduate Student Research (SCGSR) program. The SCGSR program is administered by the Oak Ridge Institute for Science and Education (ORISE) for the DOE. ORISE is managed by ORAU under contract number DE‐SC0014664.

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SLIDE 20

ANDREW SUTTON 20

Back-Ups

ANDREW SUTTON 20