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Igor LiubarskyInstituto de Fisica Corpuscular
IFIC - INSTITUTO DE FISICACORPUSCULAR
NEXTELECTROLUMINESCENCE
READOUT
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Why do itNeutrinoless Double Beta Decay
Neutrino Experiments with Xe TPCCollaboration
NEXT conceptNEXT technology
Signal Detection
Backgrounds
Prototypes
NEXT 1 ELField Cage
Readout Planes
Photomultiplier plane
SiPM plane
Gas System
NEXT 1 ELBL
NEXT 1 MM
APDs
Project PlaningQuo vadis?
CONTENTS
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Neutrinoless Double β decayin 136Xe Lifetime
Tββ2ν 1018 −1020 y
Tββ0ν 1026 −1027 y
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NEXT and the race toward the ultimate ββ0ν experiment 43
!eutrino "xperimentwith a #enon $PC
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CIEMAT (Madrid) U. Girona IFAE (Barcelona) IFIC (Valencia)
U. Santiago U.P. Valencia U. Zaragoza
UAN (Bogotá)
JINR (Dubna)
U. Coimbra U. Aveiro
CEA (Saclay)
LBNL Texas A&M
NEXT Collaboration
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Ionisation and Scintillation in Xenon can be recorded in NEXT
The NEXT concept
A high-pressure gaseous Xenon, electroluminescent TPC.
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8
0
0 1 2 3 4
Density, g/cm”
Bol
otni
kov
and
Ram
sey,
NIM
A 3
96 (1
997)
Intrinsic resolution (Fano factor) at Qββ (2458 keV): 3×10-3 FWHM.
Best experimental result: 4×10-3 FWHM.
NEXT target: <1% FWHM.
Energy resolution inHigh Pressure Xe
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X (mm)0 50 100 150 200
Y (
mm
)
-300
-250
-200
-150
Electrons travel on average ~15 cm each. Trajectories highly affected by multiple scattering. Electrons behave
as MIPs except near the endpoints (blobs).
Tracking in High Pressure Xe
T1/2−1 ∝ a ⋅ ε ⋅ M ⋅ t
ΔE ⋅ B
Simulation
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High pressure chamber (10-20 bar)
Achieve best possible energy resolution (~1% FWHM)
Topological signature
Mass: 100 kg of Xe-136 enriched at 90%
Electroluminescence TPC default technology
NEXT technology
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TPC filled with highly enriched (>90%) 136Xe gas at 10 bar
pressure.
Chamber walls lined with material highly reflective to UV light.
Baseline detector with ~100 kg fiducial mass (2 m3): NEXT-100.
Signal Detection
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A 136Xe isotope decays emitting the two electrons.
They propagate through the HPXe ionising and exciting its atoms.
Signal Detection
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Prompt primary scintillation light emission in VUV (~175 nm). About
100 eV needed to create a primary scintillation photon.
Detect faint signal via sensitive photo-detectors (PMTs) behind
transparent cathode.
Determine t0 and therefore event position along drift.
PH
OTO
DE
TEC
TOR
S
Signal Detection
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Create ionisation charge in Xe: ~25 eV to create one electron-ion pair.
Electrons drift toward anode with velocity ~1 mm/us in a ~1kV/cm
electric drift.
At 10 bar pressure, non-negligible diffusion: 9 mm/√m transverse, 4
mm/√m longitudinal).
AN
OD
E −→E
Signal Detection
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−→E
Additional grid in front of anode creates ~0.5 mm thick region of more intense field: E/p ~4 kV/cm/bar.
Secondary scintillation light (electroluminescence) created in between grids by atomic de-excitation, with very linear gain of order 103 and over a ~2us interval.
Finely segmented photo-detector plane just behind anode performs “tracking”
PH
OTO
DE
TEC
TOR
S
Signal Detection
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−→E
Electroluminescence, emitted isotropically, also reaches cathode.
Same array of photo-detectors used for t0 measurement is also used
for accurate calorimetry.
PH
OTO
DE
TEC
TOR
S
PH
OTO
DE
TEC
TOR
S
Signal Detection
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Two radioactive background sources in our
Region of interest: 208Tl and 214Bi
NEXT backgrounds
The event numbers are not to scaleSAME no of events for all 3 histo
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Only gamma-generated electron tracks in the detector fiducial volume can become a background.
Topological cuts and pattern recognition (single-electron track vs. two-electrons track) provide an overall 10-7 rejection factor.
Selection efficiency for the signal of ~30%.
Background Rejection
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veto of charged backgrounds
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Gaseous Xe long attenuation length (>3 m at 10 bar) to
high energy gammas.
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photoelectric effect
(gammas around Q)
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photoelectric and bremsstrahlung
(gammas above Q)
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double Comptonor
Compton+photoelectric
(gammas around and above Q)
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NEXT-1-EL
Presently :The Largest Gaseous Xe
Electroluminescence TPC
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19 HAMAMATSU R7378A
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Mock-‐up PMT x19
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SiPM Plane
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People Working
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Selec>on of Si-‐PMs to have the minimum spread in gain.18 Daughter Boards
12 Boards with 16 Si-‐PMs
2 Boards with 12 Si-‐PMs
4 Boards with 8 Si-‐PMs
SiPM Plane
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- Daughter board for temperature tests :
- 5 temperatures sensors (DB18B20)
- 5 thermocouples
Daughterboard for temperature tests
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Single Photon Spectrum of
each single Si-‐PMs
Spread in gain of each
Daughter Board
Spread =RMS
Mean
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DBo Nº 2Vop= 71,14 VGain = 2,439Spread=1,90%
DBo Nº 3Vop=71,18 VGain = 2,418Spread=2,97%
DBo Nº 1Vop= 71,15 VGain = 2,457 Spread=1,83%
DBo Nº 4Vop= 71,16VGain = 2,367 Spread=3,58%
DBo Nº 5Vop= 71,17VGain = 2,371 Spread=2,87%
DBo Nº 6Vop= 71,19VGain = 2,354 Spread=1,70%
DBo Nº 7Vop= 71,2VGain = 2,433 Spread=2,65%
DBo Nº 8Vop= 71,21VGain = 2,379 Spread=2,35%
DBo Nº 9Vop= 71,23VGain = 2,406 Spread=2,12%
DBo Nº 10Vop= 71,24VGain = 2,474 Spread=0,99%
DBo Nº 11Vop= 71,26VGain = 2,507 Spread=2,38%
DBo Nº 12Vop= 71,28VGain = 2,409 Spread=2,66%
DBo Nº 13Vop= 71,1VGain = 2,268 Spread=2,00%
DBo Nº 15Vop= 71,34VGain = 2,383 Spread=2,36%
DBo Nº 14Vop= 71,13VGain = 2,409 Spread=2,50%
DBo Nº 16Vop= 71,37VGain = 2,346 Spread=2,05%
DBo Nº 18Vop= 71,32VGain = 2,344 Spread=1,59%
DBo Nº 17Vop= 71,3VGain = 2,382 Spread=2,08%
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Coating SiPMs
SiPMs are coated with
TPB at ICMOL
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SiPM Tetraphenyl-Butadiene (TPB)Coating
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GAS SYSTEM SCHEMATIC
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GAS SYSTEM IN THE LAB
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Other R&D Efforts
NEXT 1 ELBL
NEXT 1 MM
APDs
In other talks
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NEXT-1-ELBL
Commissioning now
Data taking before the end of the year
TAMU 7 PMT CHAMBER
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NEXT-1-MM1152 pixels Bulk Micromegas, D ~30 cm
Soon to operate with MM micro-bulk
“Teflon and
copper only” HV
penetrators...
very promising
candidate for
NEXT-100
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APDs
IFAE setup
APDs show excellent
energy resolution
(~1% at Qbb )
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Project SchedulingNEXT
Gas System 1.09 years D; D
Shielding 7.05 months R.S.; N.H.H.; G.L.; S.C.; J.L.P.A.
DAQ 1.33 years C.; R.E.; C.W.L.; A.T.; I.L.; C.T.; J.M.; F.M.; F.M.; A.G.; …
Vessel 6.5 months H.G.M.; J.; I.L.; P.D.; J.C.; S.C.
Software 3.93 years L.S.; F.M.; U.R.; J.M.; C.L.; L.S.; J.M.; P.N.; M.S.; J.H.
PMT Shield 1.2m D.N.; A.G.
VX (Xe Vessel) 2.5m D.S.; J.W.
TDR 1 year
PMT Characterization and calibration 1.12 years R.S.; N.Y.
NEXT 100 Construction 1.08 years
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q22009 2010 2011 2012 2013 2014
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43
100 1000 1000010
100
1.0% FWHM0.5% FWHM
m!!
(m
eV)
exposure (kg year)
Shell model matrix element
Quo vadis?Sensitivity of NEXT 100
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THE END