ProtoDUNE-SP Beamline Reconstruction: Time of Flight and Cherenkov - - PowerPoint PPT Presentation

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ProtoDUNE-SP Beamline Reconstruction: Time of Flight and Cherenkov - - PowerPoint PPT Presentation

Jan 31, 2023 277 likes •422 views

ProtoDUNE-SP Beamline Reconstruction: Time of Flight and Cherenkov Detectors Justin Hugon Louisiana State University ProtoDUNE Sim/Reco Meeting 2018-11-07 Introduction Id like to look at beam pionsneed to understand beamline

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SLIDE 1

ProtoDUNE-SP Beamline Reconstruction: Time of Flight and Cherenkov Detectors

Justin Hugon Louisiana State University ProtoDUNE Sim/Reco Meeting 2018-11-07

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SLIDE 2

Justin Hugon

Louisiana State University

ProtoDUNE-SP Beamline Reco: TOF & Cherenkov 2

Justin Hugon

Louisiana State University

Introduction

  • I’d like to look at beam pions—need to understand

beamline detectors

  • Look at time of fmight (TOF) and Cherenkov detector

data from Jake’s reconstruction

  • Use np04_full-reconstructed_v07_08_00_03_physics

dataset of my own reco using v07_08_00_03 and protoDUNE_SP_keepup_decoder_reco.fcl

  • Using:
  • Run 5145 at 7 GeV/c
  • Run 5387 at 1 GeV/c
  • Run 5430 at 2 GeV/c
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SLIDE 3

Justin Hugon

Louisiana State University

ProtoDUNE-SP Beamline Reco: TOF & Cherenkov 3

Justin Hugon

Louisiana State University

Time of Flight

Low-mass particles take 155 ns--doesn’t mesh with d=14 m (47 ns); Assume dc = 155 ns for now

Zoomed version of left plot

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SLIDE 4

Justin Hugon

Louisiana State University

ProtoDUNE-SP Beamline Reco: TOF & Cherenkov 4

Justin Hugon

Louisiana State University

Time of Flight versus Momentum

  • Plotting TOF versus

momentum leads to bands based on mass

  • I put lines of what it should

be assuming d/c = 155 ns

  • There seems to be a band

between the proton and K+ for 1 and 2 GeV/c

  • Probably protons
  • Some bias in momentum

reco?

  • 7 GeV/c one blob

Deuteron Proton K+ π+ μ+ e+ Δt= d c √ m

2c 2

p2 +1

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SLIDE 5

Justin Hugon

Louisiana State University

ProtoDUNE-SP Beamline Reco: TOF & Cherenkov 5

Justin Hugon

Louisiana State University

Beamline Mass Squared

  • Now plotting the mass

squared from the beamline detectors

  • Random fmuctuations in

TOF (and maybe Momentum) can make this negative

  • Second peak clearly

doesn’t line up with kaon

  • r proton mass
  • 7 GeV/c smeared across

this range

Proton K+

π+/μ+/e+

m

2c 2=p 2( Δt 2c2

d 2 −1)

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SLIDE 6

Justin Hugon

Louisiana State University

ProtoDUNE-SP Beamline Reco: TOF & Cherenkov 6

Justin Hugon

Louisiana State University

Beamline Mass

  • Low masses are sculpted

by the square root and imprecision in d/c

  • Second peak clearly

doesn’t line up with kaon

  • r proton mass
  • 7 GeV/c smeared across

this range

Proton K+

π+/μ+/e+

m

2c 2=p 2( Δt 2c2

d 2 −1) Deuteron

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SLIDE 7

Justin Hugon

Louisiana State University

ProtoDUNE-SP Beamline Reco: TOF & Cherenkov 7

Justin Hugon

Louisiana State University

Scaling Momentum

I tried scaling the momentum to line up with the lines It seems that the momentum should be 40% larger! Magnetic fjeld or fjber tracker alignment issue? Something else?

Deuteron Proton K+ π+ μ+ e+ μ+ π+ Proton Deuteron

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SLIDE 8

Justin Hugon

Louisiana State University

ProtoDUNE-SP Beamline Reco: TOF & Cherenkov 8

Justin Hugon

Louisiana State University

Threshold Cherenkov Detectors

  • Particles only give ofg light if their velocity is
  • ver a threshold (set by the gas pressure)
  • My guess is that the thresholds are set so we

see light with the following particles in each Cherenkov detector:

No Light Light in Cherenkov 0 Light in Cherenkov 1 1 GeV/c μ+/- π+/- protons e+/- 2 GeV/c μ+/- π+/- protons e+/- 7 GeV/c protons K+/- e+/- μ+/- π+/-

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SLIDE 9

Justin Hugon

Louisiana State University

ProtoDUNE-SP Beamline Reco: TOF & Cherenkov 9

Justin Hugon

Louisiana State University

Charenkov Status

0 means no light, 1 means light No Cherenkovs were on for run 5387

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SLIDE 10

Justin Hugon

Louisiana State University

ProtoDUNE-SP Beamline Reco: TOF & Cherenkov 10

Justin Hugon

Louisiana State University

Conclusions & Next Steps

  • Time of fmight seems to be able to separate

electrons/muons/pions from protons at 1 and 2 GeV/c

  • Time of fmight versus momentum doesn’t line up

with the expectation

  • Scaling momentum by 1.4 makes things line up
  • Is there a magnetic fjeld or tracker position issue?
  • Next, want to look at Pandora track/shower ID for

difgerent Cherenkov categories

  • Plan to make an art fjlter using the TOF and

Cherenkov

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SLIDE 11

Justin Hugon

Louisiana State University

ProtoDUNE-SP Beamline Reco: TOF & Cherenkov 11

Justin Hugon

Louisiana State University

Backup Slides

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SLIDE 12

Justin Hugon

Louisiana State University

ProtoDUNE-SP Beamline Reco: TOF & Cherenkov 12

Justin Hugon

Louisiana State University

Time of Flight around 155 and Momentum

Low-mass particles take 155 ns--doesn’t mesh with d=14 m (dc = 47 ns);

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SLIDE 13

Justin Hugon

Louisiana State University

ProtoDUNE-SP Beamline Reco: TOF & Cherenkov 13

Justin Hugon

Louisiana State University

Beamline Mass Squared

  • Due to smearing of the

TOF , you get TOF < 0

  • In toy studies for LArIAT, I

found it’s good to have the e/pi/mu distribution ~centered on zero

  • You also want to cut on

mass squared to not lose the e/pi/mu with negative values

π+ μ+ e+

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SLIDE 14

Justin Hugon

Louisiana State University

ProtoDUNE-SP Beamline Reco: TOF & Cherenkov 14

Justin Hugon

Louisiana State University

Scaling Momentum by 1.4

If we really need to scale up the momentum by 1.4, then 1→1.4, 2→2.8, 7→9.8 GeV/c