Robert Cooper L. Garrison, L. Rebenitsch, R. Tayloe, R. Thornton.
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Transcript of Robert Cooper L. Garrison, L. Rebenitsch, R. Tayloe, R. Thornton.
- Slide 1
- Robert Cooper L. Garrison, L. Rebenitsch, R. Tayloe, R. Thornton
- Slide 2
- INTRODUCTION
- Slide 3
- MI-12 Neutron Background Run Neutrons ~18 m from target 40 days on target (60 days total) In-line behind beam target (ground) 1 kg EJ-301 detector motivated SciBath placement
- Slide 4
- MI-12 Neutron Background Run Neutrons ~18 m from target 40 days on target (60 days total) In-line behind beam target (ground) 1 kg EJ-301 detector motivated SciBath placement
- Slide 5
- THE SCIBATH DETECTOR
- Slide 6
- Design Concept Bath of liquid scintillator ~40 cm length cubic volume 3D array, crossed wave- length shifting fiber readout 768-channel with 64-anode PMT system (x12) IU custom-built DAQ ($70 per channel with PMT)
- Slide 7
- The SciBath Detector 80 L liquid scintillator (LS) 88% mineral oil 11% pseudocumene 1% PPO 768 (3-16x16) array wavelength-shifting fibers (x,y,z axes) 1.5 mm diameter 2.5 cm spacing UV blue
- Slide 8
- The SciBath Detector Pulsed LED calibration
- Slide 9
- The SciBath Detector N 2 and LS plumbing
- Slide 10
- The SciBath Detector Electronics readout & PMTs
- Slide 11
- The SciBath Detector Electronics readout & PMTs
- Slide 12
- Sample Event
- Slide 13
- Anticipated Sensitivity (n events)
- Slide 14
- n / Particle Discrimination
- Slide 15
- muons
- Slide 16
- n / Particle Discrimination neutrons
- Slide 17
- PRELIMINARY NEUTRON ENERGY SPECTRUM
- Slide 18
- Beam Spill Time / PE Structure Bin 6 Bin 10 Bin 11 Bin 12Bin 13Bin 16 Bin 20
- Slide 19
- Beam Spill Time / PE Structure Softening of PE spectrum in time
- Slide 20
- Preliminary Analysis Roadmap 1.Measure proton PE response 2.Convert proton PEs to energy scale 3.Unfold spectrum of neutrons from protons 4.Divide detector efficiency 5.Normalize to X units (X = time, POT, triggers, etc.) Future spectra will combine 3. and 4. in MC
- Slide 21
- Preliminary Analysis Roadmap 1.Measure proton PE response 2.Convert proton PEs to energy scale 3.Unfold spectrum of neutrons from protons 4.Divide detector efficiency 5.Normalize to X units (X = time, POT, triggers, etc.) Future spectra will combine 3. and 4. in MC
- Slide 22
- SciBath In-Beam PE Spectrum PEs
- Slide 23
- Preliminary Analysis Roadmap 1.Measure proton PE response 2.Convert proton PEs to energy scale 3.Unfold spectrum of neutrons from protons 4.Divide detector efficiency 5.Normalize to X units (X = time, POT, triggers, etc.) Future spectra will combine 3. and 4. in MC
- Slide 24
- Proton Response and Quenching Birks Law used to convert to energy deposit Handles quenching for large dE / dx
- Slide 25
- Proton Response and Quenching Birks Law used to convert to energy deposit Handles quenching for large dE / dx
- Slide 26
- Energy Deposit Spectrum Assume everything is a proton recoil and apply quenching formula 300 MeV protons can range-out in SciBath.
- Slide 27
- Preliminary Analysis Roadmap 1.Measure proton PE response 2.Convert proton PEs to energy scale 3.Unfold spectrum of neutrons from protons 4.Divide detector efficiency 5.Normalize to X units (X = time, POT, triggers, etc.) Future spectra will combine 3. and 4. in MC
- Slide 28
- A Quick Unfolding Algorithm Assume isotropic CM scattering Assume uniform energy deposit Assume monotonic with endpoint Integrate uniform cake layers n p EpEp EnEn
- Slide 29
- A Quick Unfolding Algorithm Assume isotropic CM scattering Assume uniform energy deposit Assume monotonic with endpoint Integrate uniform cake layers
- Slide 30
- A Quick Unfolding Algorithm Assume isotropic CM scattering Assume uniform energy deposit Assume monotonic with endpoint Integrate uniform cake layers
- Slide 31
- A Quick Unfolding Algorithm Assume isotropic CM scattering Assume uniform energy deposit Assume monotonic with endpoint Integrate uniform cake layers
- Slide 32
- Unfolded Neutron Spectrum
- Slide 33
- Preliminary Analysis Roadmap 1.Measure proton PE response 2.Convert proton PEs to energy scale 3.Unfold spectrum of neutrons from protons 4.Divide detector efficiency 5.Normalize to X units (X = time, POT, triggers, etc.) Future spectra will combine 3. and 4. in MC
- Slide 34
- Detection Efficiency (MC)
- Slide 35
- Predicted Neutron Spectrum
- Slide 36
- Preliminary Analysis Roadmap 1.Measure proton PE response 2.Convert proton PEs to energy scale 3.Unfold spectrum of neutrons from protons 4.Divide detector efficiency 5.Normalize to X units (X = time, POT, triggers, etc.) Future spectra will combine 3. and 4. in MC
- Slide 37
- Neutron Spectrum per Beam Spill 3 neutrons per spill (1 neutron > 40 MeV)
- Slide 38
- NEXT STEPS
- Slide 39
- Underway Implement MC unfolding Least squares fit or maximum likelihood? POT analysis Explore effect of n- capture tagging, fiducial cuts, and PID Directional analysis Double scatter analysis More Aggressive n / discrimination Validate with cosmic ns