LArTPC Testbeam: CAPTAIN and LArIAT Jason St. John, University of - - PowerPoint PPT Presentation

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LArTPC Testbeam: CAPTAIN and LArIAT Jason St. John, University of - - PowerPoint PPT Presentation

Sep 03, 2023 169 likes •679 views

LArTPC Testbeam: CAPTAIN and LArIAT Jason St. John, University of Cincinnati On behalf of the LArIAT Collaboration and for the CAPTAIN Collaboration NuFact 2015, Rio de Janeiro Outline miniCAPTAIN (neutrons) & LArIAT (charged species) -

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LArTPC Testbeam: CAPTAIN and LArIAT

Jason St. John, University of Cincinnati On behalf of the LArIAT Collaboration and for the CAPTAIN Collaboration NuFact 2015, Rio de Janeiro

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SLIDE 2

Outline

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miniCAPTAIN (neutrons) & LArIAT (charged species)

  • Liquid Argon TPC Test Beams for Neutrino Physics
  • Physics goals
  • R&D goals
  • Experimental Setups
  • Incident Beams
  • Inside the cryostat
  • Beautiful data
  • Future plans
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SLIDE 3

LArTPCs Test Beams for Neutrino Physics

Liquid argon time projection chambers (LArTPCs) capture neutrino interaction final products in unprecedented detail Dedicated calibration effort needed

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MicroBooNE DUNE SBND ICARUS

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SLIDE 4

MiniCAPTAIN

Cryogenic Apparatus for Precision Tests of Argon Interactions with Neutrinos

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SLIDE 5

1m Ø LArTPC in neutron beam at Weapons Neutron Research facility

Physics goals: Ar* nuclear de-excitations Neutron scatters at known En Neutron-induced π± production

MiniCAPTAIN

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The mini- CAPTAIN cryostat

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SLIDE 6

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Los Alamos National Lab Los Alamos Neutron Science Center

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SLIDE 7

Incident Beam

Known neutron energy from Time of Flight

  • Beam on target starts

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  • Cryogenic PMTs stop it

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Neutron beam energy spectrum will be closely matched to cosmic-induced neutron energy spectrum

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SLIDE 8

Inside the cryostat

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1 m 32 cm

Cathode wires Wire/anode planes Readout ASICs

The time projection chamber

  • MicroBooNE cold electronics
  • 3 planes @ 3 mm pitch
  • Drift field ~500 V/cm
  • 16 x 1” PMTS
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SLIDE 9

LArIAT

Liquid Argon In A Testbeam

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SLIDE 10

LArIAT

“Table-top” (170L) LArTPC in a test beam at Fermilab Test Beam Facility

  • Repurposed ArgoNeuT detector
  • Physics goals:
  • π-Ar interactions
  • e/γ shower ID
  • μ-Ar capture
  • non-magnetic charge determination
  • kaon studies
  • Geant4 validation
  • R&D goals:

Optimize PID algorithm, calorimetry with charge & light, and 2D/3D event reconstruction

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The ArgoNeuT/LArIAT TPC and cryostat

90 cm 47 cm 40 cm

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SLIDE 11

11 Linac Booster

Main Injector

Fermilab Test Beam Facility

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SLIDE 12

Beamline Plan View

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Tertiary Beamline & LArIAT TPC Tunable 8 - 64 GeV π± Primary 120 GeV p Secondary Target (Cu) Primary Target (Al)

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SLIDE 13

Beamline Plan View

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Primary Target (Al) Secondary Target (Cu) Tertiary Beamline & LArIAT TPC Tunable 8 - 80 GeV π± Primary 120 GeV p

next slide

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SLIDE 14

Tertiary Beamline

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Secondary beam 8-64 GeV π±

collimator Cu target Time of flight scintillators Multi-wire proportional chambers (MWPCs) Bending dipole magnets Aerogel counters Cryostat & TPC μ punch- through paddles μ range stack

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SLIDE 15

Tertiary Beamline

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SLIDE 16

Incident Particle Beam

MWPCs + bending magnet

  • Charge-selected beam

200 - 1200 MeV/c

  • Single-particle momentum

measurements

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Momentum windows in excellent agreement with simulation

Upstream MWPCs Downstream MWPCs

Δθ

  • J. St. John
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SLIDE 17

Incident Particle Beam

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Full and Half momentum settings/magnet currents cover MicroBooNE neutrino event secondary momentum range

I.Nutini

MWPCs + bending magnet

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SLIDE 18

Incident Particle Beam

Time of flight (TOF) for separation between π’s/μ’s and protons ~2:1 ratio of π/µ to p

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TOF vs reconstructed momentum

π/μ p p π/μ K

  • J. Ho
  • J. Ho
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SLIDE 19

Incident Particle Beam

Aerogel Cherenkov counters for further PID Possible π vs. μ discrimination using combination of thresholds and pulse height Effective for TPC-contained π/µ range: 230-400 MeV/c

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Fast particles Slow particles

  • E. Iwai
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SLIDE 20

Incident Particle Beam

Muon range stack for discrimination of through- going muons/pions Effective for high-p π/µ range: 400+ MeV/c Some commissioning still

  • ngoing

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π+/- μ+/-

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SLIDE 21

Inside the cryostat

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9 c m 47 cm 40 cm

Cathode plane Wire/anode planes Pulse Shaping & Amplifying ASICs

The time projection chamber

  • Repurposed from ArgoNeuT
  • New wire planes, 240 wires each
  • shield
  • induction
  • collection
  • Drift field ~500 V/cm
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SLIDE 22

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Light collection system

  • 2 PMTs + 3 SiPMs
  • VUV scintillation light wavelength-

shifted at TPB-coated reflector foils lining field cage

TPB reflector Field cage wall

Inside the cryostat

Photoelectron yield: ~40 p.e./MeV at zero E-field

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SLIDE 23

First data

▪ April 30, 2015 – TPC turned on, first cosmic-triggered track!

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LArIAT

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SLIDE 24

First data

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…and first beam events soon after…

LArIAT

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SLIDE 25

Tired, Happy Scientists

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Primer on beam events

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Incident Beam Direction z y U z V y LArIAT d r i f t t i m e U wire V wire drift time drift time d r i f t t i m e

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SLIDE 27

π+/- p p γ γ γ γ π+/-

Some event topologies seen by LArIAT

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π+/- single charge exchange p p

LArIAT

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SLIDE 28

Some event topologies seen by LArIAT

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π- absorption on Ar Stopping/decaying π+/- π+/- π+/- μ+/- μ+/- π - π - p p p p e+/- e+/-

LArIAT LArIAT

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SLIDE 29

Some event topologies seen by LArIAT

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Photon-initiated shower e+/- -initiated shower

Distinguishable using dE/dx at start of shower

LArIAT LArIAT

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SLIDE 30

Some event topologies seen by LArIAT

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K+/- → π+/- π0 K- K- π - µ- e- γ γ γ γ π - µ- e-

LArIAT

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SLIDE 31

Some event topologies seen by LArIAT

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K+/- → π+/- π0 K- K- π - µ- e- γ γ γ γ π - µ- e-

Monte Carlo LArIAT

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SLIDE 32

Summary of Run I

Beam data taking ran about 2 months

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Beam-taking Low-E source running

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SLIDE 33

A few ongoing analyses…

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Eye scan of a small fraction of the data

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Topology breakdown among the unambiguous, single-track events A rich physics program will emerge from analyses!

  • N. Birrer
  • K. Nelson
  • S. O’Neil
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SLIDE 35

Reconstruction status

Rapid progress in reconstructing both beamline & TPC ionization tracks

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  • R. Acciarri
  • T. Yang
  • I. Nutini

Pion scatter Cosmic μ

Wire chamber tracks

  • M. Smylie

MWPC1

  • A. Olivier

MWPC2 MWPC3 MWPC4 TPC volume

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SLIDE 36

N2 levels with scintillation light

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N2 content in LAr suppresses scintillation light From fits to scintillation light extract “late” light time component and determine N2 concentration

Results agree with gas analyzers

  • P. Kryczynski
  • A. Szelc

Slow component decay time (/ns) Nitrogen concentration (/ppm) Nitrogen contamination

Comparison with model from WArP

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SLIDE 37

Electron lifetime / O2 levels with cosmic μ’s

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μ

Dedicated paddles for cosmic-μ triggers

  • R. Acciarri

Fit to charge vs. drift time for measurement of electron lifetime

Able to calculate O2 concentration below sensitivity of our gas analyzers

Current results show O2 < 1ppb, agreement with gas analyzers

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SLIDE 38

Pion interactions I – elastic scattering

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inelastic scatter absorption

  • n Ar

charge exchange pion production

  • I. Nutini

Pion-Argon elastic scattering Look for kinks in incoming pion-tagged tracks

LArIAT

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SLIDE 39

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Pion absorption

  • Incident tagged π, no π’s in final state
  • Often accompanied by protons/neutrons

Pion interactions II – absorption

LArIAT LArIAT

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SLIDE 40
  • R. Linehan

Reconstructed “clusters”

Pion single charge exchange

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Active effort to ID and reconstruct

  • π0 mass peak from mγγ
  • Cross section

MC studies to understand containment

  • f these events in TPC

π+ + n π0 + p γ γ

  • J. Ho
  • J. Ho
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SLIDE 41

Michel electrons

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LAr scintillation-based trigger to record stopping/decaying cosmic μ’ s Initial reconstruction focused on light signals only

  • Track/shower algorithms to follow

Eventual use as energy calibration source and measurement of μ- nuclear capture rate

Ideal e+/- spectrum for decaying free μ

Preliminary

Decay time of LArIAT Michel candidates (~10 hrs data) ns

LArIAT

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SLIDE 42

Summary

LArTPC test beams are getting underway! MiniCAPTAIN has just seen its calibration laser track

  • Neutron beam running will begin soon

LArIAT’s run 1 was a success – lots of new data to analyze

  • Offline event reconstruction actively evolving day-by-day
  • Several analyses underway with more to come
  • Actively preparing for Run II this Autumn

Detailed calibration, cross sections, etc. on the horizon!

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Thank you!

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Backup

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Beam commissioning

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Installation of beamline detectors and TPC-less running to test them (and characterize the beam) Completed summer 2014

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Cryogenic Ultra-Pure LAr

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Powerful, flexible trigger system

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Incident Beam

Time of Flight → En

  • Beam on target starts

clock

  • Cryogenic PMTs stop it

Time structure of n beam:

  • 625 µs macropulses of

sub-ns micropulses @ 1.8 µs

  • 40 Hz macropulse rate

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Neutron beam closely matched to cosmic-induced neutron spectrum

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SLIDE 49

4.2 seconds of beam per spill = 380k orbits * 18.8 ns * 7 * 84

1 spill every 60.8 seconds

Time Structure of the Beam

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1.8 ns buckets 18.8 ns peak-to- peak 84 buckets per bunch 7 bunches per orbit abort gap