PSD-capable Plastic Scintillators with 6 Li Doping for neutron and - - PowerPoint PPT Presentation

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PSD-capable Plastic Scintillators with 6 Li Doping for neutron and - - PowerPoint PPT Presentation

Jan 05, 2023 154 likes •389 views

PSD-capable Plastic Scintillators with 6 Li Doping for neutron and reactor-antineutrino detection Viacheslav A. Li Lawrence Livermore National Laboratory Collaborators: Tomi Akindele, Nathaniel Bowden, Timothy M. Classen, Steven A. Dazeley,

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SLIDE 1

PSD-capable Plastic Scintillators with 6Li Doping for neutron and reactor-antineutrino detection

Viacheslav A. Li Lawrence Livermore National Laboratory Collaborators: Tomi Akindele, Nathaniel Bowden, Timothy M. Classen, Steven A. Dazeley, Mark J. Duvall, Igor Jovanovic, Andrew N. Mabe, Michael P. Mendenhall, Edward T. E. Reedy, Felicia Sutanto, Xianyi Zhang Coordinating Panel for Advanced Detectors (CPAD) Workshop Madison, WI December 8-10, 2019

This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. LLNL-PRES-798690

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SLIDE 2

Reactor antineutrino monitoring

CPAD2019 Viacheslav Li (LLNL) PSD capable Plastic Scintillators with Li-6 Doping for neutron and reactor antineutrino detection 2 /22

NEXT FRONTIER: Mobile Reactor Monitoring and Spectral Measurements

Credit: Yale U

PLASTICS:

  • Easier to engineer the segmented detector
  • Less problems with material compatibility
  • Not combustible

PROSPECT, the most precise near-field experiment, uses 4 tons

  • f 6Li-doped liquid scintillator and

is surface-based. 11x14 segments.

~ 2 x 1020 ν / s / GWth

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SLIDE 3

These have never been done before:

CPAD2019 Viacheslav Li (LLNL) PSD capable Plastic Scintillators with Li-6 Doping for neutron and reactor antineutrino detection 3 /22

  • Multi-reactor spectral measurements (mobile antineutrino detectors)
  • Antineutrino detectors based on 6Li PSD plastic scintillator
  • IBD directionality in mobile antineutrino detector

Potential applications: Non-proliferation of nuclear weapons SNM detection (neutron detection) Reactor fuel monitoring SANDD

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SLIDE 4

Segmented AntiNeutrino Directional Detector

CPAD2019 Viacheslav Li (LLNL) PSD capable Plastic Scintillators with Li-6 Doping for neutron and reactor antineutrino detection 4 /22

  • Total volume 10 liters of 6Li PSD plastic scintillator

○ 64 rods: 5mm x 5mm x 40cm ○ 12 rods: 2.5cm x 2.5cm x 40cm ○ 10 rods: 2.5cm x 5cm x 40cm

  • Photodetectors:

○ 2 64-pixel SensL J-series SiPM arrays ○ 44 1” Hamamatsu HQE PMTs

  • DAQ: 250MHz Struck 3316 digitizers

○ 172 + 12 (veto) channels

  • 2 IBD events per day at PROSPECT location (HFIR)

SANDD SANDD 40 cm

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SLIDE 5

Inverse β decay with 6Li

CPAD2019 Viacheslav Li (LLNL) PSD capable Plastic Scintillators with Li-6 Doping for neutron and reactor antineutrino detection 5 /22

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SLIDE 6

Inverse β decay with 6Li

CPAD2019 Viacheslav Li (LLNL) PSD capable Plastic Scintillators with Li-6 Doping for neutron and reactor antineutrino detection 6 /22

Segmentation allows better vertex reconstruction for prompt/delayed and better background suppression. Capture on 6Li result in triton and alpha --- depositing energy in close proximity to the capture. σ ~ 936 barns Q = 4.78 MeV

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SLIDE 7

Inverse β decay with 6Li

CPAD2019 Viacheslav Li (LLNL) PSD capable Plastic Scintillators with Li-6 Doping for neutron and reactor antineutrino detection 7 /22

Segmentation allows better vertex reconstruction for prompt/delayed and better background suppression. Capture on 6Li result in triton and alpha --- depositing energy in close proximity to the capture. IBD directionality: on average, vector between delayed and prompt vertices points towards the reactor. σ ~ 936 barns Q = 4.78 MeV

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SLIDE 8

R&D on PSD and 6Li-doping at LLNL

CPAD2019 Viacheslav Li (LLNL) PSD capable Plastic Scintillators with Li-6 Doping for neutron and reactor antineutrino detection 8 /22

  • A. Mabe et al. SPIE (2019)

First stable PSD plastics First 6Li-doped PSD plastics

  • N. Zaitseva et al. NIM A668 (2012)
  • N. Zaitseva et al. NIM A729 (2013)
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SLIDE 9

CPAD2019 Viacheslav Li (LLNL) PSD capable Plastic Scintillators with Li-6 Doping for neutron and reactor antineutrino detection 9 /22

  • A. Mabe et al. SPIE (2019)

— alpha (neutron capture 6Li) — p (neutron) — e (gamma) time voltage tail total Figure of Merit (FOM) Qtail/Qtotal Events n e

0.1% 6Li Aromatic Aliphatic Light Output 72% 83% FOM(PSD) 3.91 3.59 Fabrication Difficult Much easier Scalable Yes Yes

Different 6Li-doped compounds and PSD

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SLIDE 10

CPAD2019 Viacheslav Li (LLNL) PSD capable Plastic Scintillators with Li-6 Doping for neutron and reactor antineutrino detection 10 /22

  • A. Mabe et al. SPIE (2019)

— alpha (neutron capture 6Li) — p (neutron) — e (gamma) time voltage tail total Figure of Merit (FOM) Qtail/Qtotal Events n e

0.1% 6Li Aromatic Aliphatic Light Output 72% 83% FOM(PSD) 3.91 3.59 Fabrication Difficult Much easier Scalable Yes Yes

Different 6Li-doped compounds and PSD

electronic recoil n u c l e a r r e c

  • i

l

6Li(n,t)α

n u c l e a r r e c

  • i

l

6Li(n,t)α

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SLIDE 11

1st prototype

CPAD2019 Viacheslav Li (LLNL) PSD capable Plastic Scintillators with Li-6 Doping for neutron and reactor antineutrino detection 11 /22

128 channels in total Sensl SiPM arrays and custom Ultralytics interconnect boards

  • V. Li et al. NIM A942 (2019)
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SLIDE 12

1st prototype: undoped PSD rods

CPAD2019 Viacheslav Li (LLNL) PSD capable Plastic Scintillators with Li-6 Doping for neutron and reactor antineutrino detection 12 /22

Total Internal Reflection inside the rods (0.9-mm air gap) 128 channels in total Rod: 11.2 cm x 0.54 cm x 0.54 cm SiPM pixel: 6.13 mm x 6.13 mm (77.8%) 64-pixel SiPM arrays

  • V. Li et al. NIM A942 (2019)
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SLIDE 13

1st prototype: double Pulse-Shape Discrimination

CPAD2019 Viacheslav Li (LLNL) PSD capable Plastic Scintillators with Li-6 Doping for neutron and reactor antineutrino detection 13 /22

First PSD in a fully-segmented scintillator instrumented with SiPM arrays.

  • V. Li et al. NIM A942 (2019)

252Cf 137Cs

Energy resolution 16% at Compton edge

gammas fast neutrons

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SLIDE 14

1st prototype: Calibration

CPAD2019 Viacheslav Li (LLNL) PSD capable Plastic Scintillators with Li-6 Doping for neutron and reactor antineutrino detection 14 /22

  • V. Li et al. NIM A942 (2019)

~12 cm effective attenuation length

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SLIDE 15

1st prototype: position resolution

CPAD2019 Viacheslav Li (LLNL) PSD capable Plastic Scintillators with Li-6 Doping for neutron and reactor antineutrino detection 15 /22

  • V. Li et al. NIM A942 (2019)

z-

Muon track

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SLIDE 16

2nd prototype:

6Li-doped PSD rods with SiPM-array readout!

CPAD2019 Viacheslav Li (LLNL) PSD capable Plastic Scintillators with Li-6 Doping for neutron and reactor antineutrino detection 16 /22

  • F. Sutanto et al. NIM A (in progress)

64 6Li-doped PSD-scintillator rods (40-cm long)

64-pixel SiPM arrays

SANDD central module

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SLIDE 17

Triple Pulse-Shape Discrimination

CPAD2019 Viacheslav Li (LLNL) PSD capable Plastic Scintillators with Li-6 Doping for neutron and reactor antineutrino detection 17 /22

  • F. Sutanto et al. NIM A (in progress)

252Cf

P R E L I M I N A R Y

FOM = 0.74, E > 1 MeVee

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SLIDE 18

Triple Pulse-Shape Discrimination

CPAD2019 Viacheslav Li (LLNL) PSD capable Plastic Scintillators with Li-6 Doping for neutron and reactor antineutrino detection 18 /22

  • F. Sutanto et al. NIM A (in progress)

Additional particle ID based on rod multiplicity: Gamma: 1..10+ rods Fast Neutron: 1..3 rods Thermal Neutron: 1 rod

252Cf

gammas fast neutrons

6Li(n,t)α

P R E L I M I N A R Y

FOM = 0.74, E > 1 MeVee

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SLIDE 19

Attenuation Length

CPAD2019 Viacheslav Li (LLNL) PSD capable Plastic Scintillators with Li-6 Doping for neutron and reactor antineutrino detection 19 /22

  • F. Sutanto et al. NIM A (in progress)

PRELIMINARY

Effective Attenuation length

~20 cm effective attenuation length

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SLIDE 20

Outer-layer 6Li-doped PSD scintillator bars

CPAD2019 Viacheslav Li (LLNL) PSD capable Plastic Scintillators with Li-6 Doping for neutron and reactor antineutrino detection 20 /22

  • F. Sutanto et al. NIM A (in progress)

Hamamatsu 1” R1924A-100

5 cm 2.5 cm 40 cm 2.5 cm 2 . 5 c m 4 c m

PRELIMINARY

FOM = 1.05 (E >1MeV, HV = -1.1kV)

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SLIDE 21

Attenuation length in 1”x1”x16” bar

CPAD2019 Viacheslav Li (LLNL) PSD capable Plastic Scintillators with Li-6 Doping for neutron and reactor antineutrino detection 21 /22

Pb Pb PMT Attenuation setup Absorber

~25-27 cm effective attenuation length GEANT4 simulation gives 50-cm intrinsic attenuation length

  • F. Sutanto et al. NIM A (in progress)
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SLIDE 22

Summary

CPAD2019 Viacheslav Li (LLNL) PSD capable Plastic Scintillators with Li-6 Doping for neutron and reactor antineutrino detection 22 /22

  • V. Li et al. NIM A942 (2019)
  • Triple PSD is achieved in fully-segmented

scintillator with SiPM arrays and PMTs.

  • Scalable and stable 6Li-doped plastic

scintillator is developed.

STAY TUNED AS WE BUILD THE FULL SANDD

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SLIDE 23

1st prototype: rod multiplicity

CPAD2019 Viacheslav Li (LLNL) PSD capable Plastic Scintillators with Li-6 Doping for neutron and reactor antineutrino detection 23 /22

  • V. Li et al. NIM A942 (2019)