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Neutron Benchmarking WG Status Update. Ray Bunker September 26, 2013. Working Group Activities. Broad-interest discussions among all WG members Ongoing analysis for first NMM measurement Coordinated DAQ for NMM & veto shield. Broad-interest WG discussions.

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neutron benchmarking wg status update

Neutron Benchmarking WGStatus Update

Ray Bunker

September 26, 2013

slide2

Working Group Activities

Broad-interest discussions among all WG members

Ongoing analysis for first NMM measurement

Coordinated DAQ for NMM & veto shield

AARM Neutron Benchmarking WG Update

slide3

Broad-interest WG discussions

  • Started by mixing non-NMM topics into NMM Fri meetings
    • Nov 2, 2012  Chao updates USD liquid scintillator detector data analysis
    • Jan 4, 2013  Anthony leads discussion of Watchman Project (LLNL)
    • Feb 8,2013  Julien & Adam introduce their He-3 NCDs at MIT work
  • Found new members at LRT 2013
    • Tom Langford  NIST Gaithersberg; the FaNS detector
    • Lea Reichhart  UCL; using ZEPLIN III to measure neutrons
  • Began ~monthly “Summary” meetings
    • Specifically dedicated to broad-interest discussions (high-level presentations):
      • May 10th FaNS& USD Liquid Scintillator
      • May 31st  ZEPLIN III & MIT NCDs
      • Next meeting  MIT NCD simulations, NMM status
    • Extended summer hiatus …

AARM Neutron Benchmarking WG Update

slide4

Ongoing NMM Analysis

  • First NMM fast-neutron measurement
    • Use ~2 years of already acquired data
    • Measure flux of high-energy neutrons (>50 MeV)
      • Publish first NMM paper by summer 2014!
    • Primarily a Syracuse activity
      • Coordinated by Richard & Ray
      • Geant4 simulation work by Yu Chen (grad)
        • Builds on previous work by Melinda Sweany (Sandia)
      • Data analysis by Chris Nedlik (undergrad)
        • Builds on previous work by UCSB students (Ray, Joel, and others)

AARM Neutron Benchmarking WG Update

slide5

NMM Analysis—Highlights!

Geant4 MC simulation

of neutron capture positions

for neutrons generated

across surface of Pb target

Courtesy Y. Chen

North Tank

Number Captured per cm2

South Tank

slide6

NMM Analysis—Highlights!

First estimate of absolute

neutron capture efficiency

Courtesy Y. Chen

North Tank

Fraction Detected per cm2

South Tank

slide7

NMM Analysis—Highlights!

Detailed data-driven understanding of 20” PMT afterpulsing

Afterpulsing rate

vs.

Initial-pulse amplitude

Courtesy C. Nedlik

~17.5 μs afterpulsing peak

slide8

NMM Analysis—Highlights!

Using background gamma rate to understand detector stability

South Tank—All Gamma-like Pulses

South Tank—Large Gamma-like Pulses

Courtesy C. Nedlik

AARM Neutron Benchmarking WG Update

slide9

Coordinated NMM & Veto-shield DAQ

  • Reinstrument NMM & veto shield
    • To correlate fast neutrons in NMM to veto-shield showers
    • Added hardware to NMM to allow GPS time stamps
      • Modified NMM software to incorporate time stamps (Anthony)
    • Recommissioned/upgraded entire LBCF veto shield
      • UMN and Soudan crews
    • Upgraded veto-shield DAQ to better manage data flow (UMN)
    • Worked out & tested correlated time stamps between systems
      • UMN crew led by Anthony
    • Recorded several weeks of “muon-mode” NMM data:
      • For further tests & to help develop analysis tools
    • Began NMM fast-neutron search w/ fully instrumented veto shield!
      • To be continued through the next ~1 year

AARM Neutron Benchmarking WG Update

slide10

NMM/Veto-shield DAQ—Highlights!

Demonstration of time-stamp correlation timing resolution

Courtesy A. Villano

slide11

NMM/Veto-shield DAQ—Highlights!

Demonstration of time-stamp correlation timing resolution

Courtesy A. Villano