CRT Requirements For ProtoDUNE Michael Mooney BNL ProtoDUNE CRT - - PowerPoint PPT Presentation

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CRT Requirements For ProtoDUNE Michael Mooney BNL ProtoDUNE CRT - - PowerPoint PPT Presentation

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CRT Requirements For ProtoDUNE Michael Mooney BNL ProtoDUNE CRT Meeting March 20 th , 2017 Introduction Introduction We will not have a UV laser system at the single- phase ProtoDUNE (unlike MicroBooNE, SBND) Instead, plan is to

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SLIDE 1

CRT Requirements For ProtoDUNE

Michael Mooney

BNL ProtoDUNE CRT Meeting March 20th, 2017

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SLIDE 2

Introduction Introduction

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♦ We will not have a UV laser system at the single- phase ProtoDUNE (unlike MicroBooNE, SBND)

  • Instead, plan is to have a cosmic ray tagging (CRT)

system installed on the upstream/downstream ends of the detector w.r.t. beam direction

  • Possibly more CRT panels installed elsewhere (e.g. top
  • f cryostat)?

♦ What should dictate CRT panel placement?

  • Ultimately, capability to obtain sufgicient rate and

coverage of cosmics that can be utilized for calibrations

♦ If a science program is important to ProtoDUNE, essential to have these calibrations done

  • Useful for technical program as well – what is spatial

variation of electron lifetime throughout detector?

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SLIDE 3

Calibrations Calibrations

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♦ Electronics response (e.g. gain, shaping-time)

  • Can be done with pulser data

♦ Wire response

  • Can be done in-situ or with test stand

♦ Space charge efgects

  • Must be done in-situ with cosmic/laser tracks

♦ Electron lifetime

  • Must be done in-situ with cosmic/laser tracks

♦ Recombination

  • Can be done in-situ, with test stand, previous exp.

♦ Difgusion

  • Can be done in-situ, with test stand, previous exp.
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SLIDE 4

Calibrations Calibrations

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♦ Electronics response (e.g. gain, shaping-time)

  • Can be done with pulser data

♦ Wire response

  • Can be done in-situ or with test stand

♦ Space charge efgects

  • Must be done in-situ with cosmic/laser tracks

♦ Electron lifetime

  • Must be done in-situ with cosmic/laser tracks

♦ Recombination

  • Can be done in-situ, with test stand, previous exp.

♦ Difgusion

  • Can be done in-situ, with test stand, previous exp.
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SLIDE 5

Calibrations Calibrations

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♦ Electronics response (e.g. gain, shaping-time)

  • Can be done with pulser data

♦ Wire response

  • Can be done in-situ or with test stand

♦ Space charge efgects

  • Must be done in-situ with cosmic/laser tracks

♦ Electron lifetime

  • Must be done in-situ with cosmic/laser tracks

♦ Recombination

  • Can be done in-situ, with test stand, previous exp.

♦ Difgusion

  • Can be done in-situ, with test stand, previous exp.

In order to reveal electron lifetime efgects, must fjrst calibrate out SCE. Removing SCE can be done with strictly spatial information from hits (natural fjrst calibration). How bad is SCE expected to be at ProtoDUNE?

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SLIDE 6

ProtoDUNE Geometry ProtoDUNE Geometry

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♦ Nominal ProtoDUNE geometry:

  • Drift (X): 3.6 m
  • Height (Y): 5.9 m
  • Length (Z): 7.0 m

♦ Dimensions used for simulations slightly difgerent (to simplify calculations):

  • Drift (X): 3.6 m
  • Height (Y): 6.0 m
  • Length (Z): 7.2 m
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SLIDE 7

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Modifjed E Field (Central Z) Modifjed E Field (Central Z)

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SLIDE 8

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Modifjed E Field (TPC End) Modifjed E Field (TPC End)

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SLIDE 9

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Spatial Distortions (Central Z) Spatial Distortions (Central Z)

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SLIDE 10

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Spatial Distortions (TPC End) Spatial Distortions (TPC End)

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SLIDE 11

SCE Calibration SCE Calibration

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SLIDE 12

CRT Panel Arrangement CRT Panel Arrangement

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♦ One possible arrangement of CRT panels: 8+8

  • n front, 8+8 on

back (H+V) ♦ Will be useful for tagging both muon halo and cosmic muon tracks ♦ Totals 32 panels, but possibly install more elsewhere (e.g. on top)?

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SLIDE 13

CRT Panel Arrangement CRT Panel Arrangement

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♦ One possible arrangement of CRT panels: 8+8

  • n front, 8+8 on

back (H+V) ♦ Will be useful for tagging both muon halo and cosmic muon tracks ♦ Totals 32 panels, but possibly install more elsewhere (e.g. on top)?

Again, CRT panel placement dictated by cosmic/halo rate/coverage requirement: – Complete coverage of TPC volume

– High enough rate to do calibration

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SLIDE 14

CRT-tagged Sample CRT-tagged Sample

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Matt Worcester

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SLIDE 15

Additional Sample Additional Sample

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♦ Can also use anode-piercing and cathode-piercing tracks to do calibration (uses TPC, light information)

  • Uses track topology to tag t0
  • Noticeable gap in coverage in center of TPC

MicroBooNE MC MicroBooNE Data

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SLIDE 16

Summary Summary

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♦ SCE spatial distortions at ProtoDUNE are quite severe!

  • 500 V/cm drift fjeld: ~4 cm longitudinal, ~20 cm transverse
  • 250 V/cm drift fjeld: ~20 cm longitudinal, ~60 cm transverse

♦ This, along with associated E fjeld distortions, can signifjcantly impact calorimetry and make downstream calibration difgicult (e.g. electron lifetime) ♦ Upstream/downstream CRT panels will help tag muons for calibration, both muon halo and cosmics

  • Helps fjll in gap in TPC centers seen in other tagged track

samples

  • Additional panels on top would provide even more

coverage in gaps

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SLIDE 17

17 17

BACKUP SLIDES

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SLIDE 18

Space Charge Efgect Space Charge Efgect

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♦ Space charge: excess electric charge (slow- moving ions) distributed over region of space due to cosmic muons passing through the liquid argon

  • Modifjes E fjeld in TPC, thus track/shower reconstruction
  • Efgect scales with L3, E-1.7

Ion Charge Density

  • B. Yu
  • K. McDonald

Approximation!

No Drift!

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SLIDE 19

Impact on Track Reco. Impact on Track Reco.

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♦ Two separate efgects on reconstructed tracks:

  • Reconstructed track shortens laterally (looks rotated)
  • Reconstructed track bows toward cathode (greater efgect

near center of detector)

♦ Can obtain straight track (or multiple-scattering track) by applying corrections derived from data- driven calibration

A B A B Cathode Anode

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SLIDE 20

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Sample “Cosmic Event” Sample “Cosmic Event”

Nominal Drift Field

500 V/cm

Half Drift Field

250 V/cm MicroBooNE

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SLIDE 21

Complications Complications

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♦ Not accounting for non-uniform charge deposition rate in detector → signifjcant modifjcation? ♦ Flow of liquid argon → likely signifjcant efgect!

  • Previous fmow studies in 2D... difgerences in 3D?
  • Time dependencies?

No Flow Flow w/o Turbulence Flow w/ Turbulence

  • B. Yu
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SLIDE 22

Liquid Argon Flow Liquid Argon Flow

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  • B. Yu
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SLIDE 23

Smoking-gun for SCE Smoking-gun for SCE

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♦ Can use cosmic muon tracks for calibration

  • Possibly sample smaller time scales more relevant for a

particular neutrino-crossing time slice

  • Minimally: data-driven cross-check against laser system

calibration

♦ Smoking-gun test: see lateral charge displacement at track ends of non-contained cosmic muons → space charge efgect!

  • No timing ofgset at transverse detector faces
  • Most obvious feature of space charge efgect

Drift Δyedge Δyedge

Anode

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SLIDE 24

35-ton 35-ton with LAr Flow with LAr Flow

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Δx

Without LAr Flow

Δx

With LAr Flow central z slice Q map from

  • E. Voirin
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SLIDE 25

35-ton with LAr Flow 35-ton with LAr Flow (cont.) (cont.)

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Δy

Without LAr Flow

Δz

Without LAr Flow

Δy

With LAr Flow

Δz

With LAr Flow

~0

central z slice Q map from

  • E. Voirin
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SLIDE 26

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Simulation of SC Efgect Simulation of SC Efgect

♦ Can use SpaCE to produce displacement maps

  • Forward transportation: {x, y, z}true → {x, y, z}sim

– Use to simulate efgect in MC – Uncertainties describe accuracy of simulation

  • Backward transportation: {x, y, z}reco → {x, y, z}true

– Derive from calibration and use in data or MC to correct reconstruction bias – Uncertainties describe remainder systematic after bias- correction

♦ Two principal methods to encode displacement maps:

  • Matrix representation – more generic/fmexible
  • Parametric representation (for now, 5th/7th order

polynomials) – fewer parameters

– Uses matrix representation as input → use for LArSoft implementation