lartpc detector basics, protodune, dune goals...lartpc: liquid argon time projection chamber...
TRANSCRIPT
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LArTPC detector basics,
ProtoDUNE, DUNE goals
Dorota Stefan (CERN/NCBJ)
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LArTPC: Liquid Argon Time Projection
Chamber
• Liquid argon is denser than water or oil
more neutrino collisions per unit volume.
• It acts as both a target and detector for
neutrinos.
• Both tracking and calorimeter at the same
time.
• Argon is transparent to own light.
• Ability to record charge particles, neutrino
vertex.
• Relatively small radiation length for
shower containment.
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Slides from Erica
Snider, https://indico.fnal.gov
/getFile.py/access?cont
ribId=3&resId=0&mat
erialId=slides&confId=
12889
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From Erica Snider
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From Erica Snider
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From Erica Snider
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From Erica Snider
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From Erica Snider
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From Erica Snider
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From Erica Snider
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From Erica Snider
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From Erica Snider
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track track
wires wires
Signal shape/amplitude depends on track
inclination
electron drift [ms]
Am
pli
tud
e
dri
ft
dri
ft
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From Erica Snider
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From Erica Snider
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From Erica Snider
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Stopping/decaying particle identification
Bethe-Bloch equation momentum [MeV/c]
dE
/dx
[M
eV
/cm
]
- < dE/dx(b) > = 2pNAr2emec
2 𝑍
𝐴 𝑧2
β2 r [ln(2𝑚
𝑒𝑐2β22𝑊
𝑚𝑎𝑥
𝐼2 ) – 2b2 – d – 2𝐷
𝑍]
Wire number
Ele
ctr
on
drif
t
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Stopping particle identification
Kinetic energy [MeV]
dE
/dx [
MeV
/cm
]
Kin
eti
c en
erg
y [
MeV
]
Range [cm]
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Particle identification of incoming particle…
D.Stefan, R.Sulej
p0
…is much more
complicated when it
interacts…
Simulated event in ProtoDUNE
using LArSoft
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Attenuation: electron lifetime
• Infinitive electron lifetime is only possible
in perfectly purified liquid argon.
• Electronegative impurities capture
electrons, decreasing electron lifetime.
Ete = e(t-t0)/te DE
Energy from
signal on wires
Energy
corrected for
electron lifetime
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Attenuation: recombination effect
Part of electrons will
recombined with the
positively charged
molecules of argon.
dErecomb = 𝑑𝐸
τ𝑒
𝐴−𝑘
ερ 𝑑𝐸τ𝑒/𝑑𝑥
A, k – parameters
r – argon density
e – electric field
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Recombination effect
No recombination effect With recombination effect
+the angular dependence of electron recombination,
maybe possible to be studied in ProtoDUNEs
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Diffusion
From arXiv: 1508.07059
• Diffusion limits the spatial
resolution of tracks with long
distances.
• For 3.6 meter drift: 1.8 mm
longitudinal and 2.5 mm
transverse to the electric field
at 500 V/cm.
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Space charge effect
• Space charge effect is present in the
detector on the surface (MicroBooNE,
ProtoDUNE).
• Mainly generated by ionization from
cosmic rays and it happens due to build-up
of slow-moving positive ions in a detector.
• Leads to distortion of the electric field
within the detector.
https://arxiv.org/pdf/1511.01563v1.pdf
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https://arxiv.org/pdf/1511.01563v1.pdf
Space charge effect
Studies perfromed in MicroBooNE
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Single ionizing particle
dE/dx [MeV/cm]
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DUNE/ProtoDUNE Goals
• DUNE: One of the main topic is CP
violation in leptonic sector: - event classification: needed reconstructed
details of the neutrino vertex,
- neutrino energy reconstruction.
more in https://dunescience.org
• In ProtoDUNEs: validation of the
reconstruction tools. Hadronic shower
reconstruction/analysis. Detector
performance study for DUNE physics.
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From PhD Thesis, D. Stefan:
http://www.ire.pw.edu.pl/~rsulej/doktorat_ds/WersjaOstateczna/rozprawa_ds.pdf
ICARUS data
Reconstruction/analysis
Reconstruction of primiary vertex is crucial for event classification:
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Reconstruction/analysis
From PhD Thesis, D. Stefan:
http://www.ire.pw.edu.pl/~rsulej/doktorat_ds/WersjaOstateczna/rozprawa_ds.pdf
ICARUS data
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• Reconstruction is a key element to
perform detector calibration and physcis.
• Let’s start to look at the simulation and
reconstruction output and extract some
basic information using LArSoft
framework.