Introduction to aircraft aeroelsticity and loads jan robert wright, jonathan edward cooper
Robert Cooper .
-
Upload
allan-hines -
Category
Documents
-
view
213 -
download
0
Transcript of Robert Cooper .
The SciBath Detector
Robert Cooper http://neutrino.indiana.edu/rlcooper
2
SciBath Detector• 80 L open volume of mineral
oil based liquid scintillator
• Neutrons recoil off protons, create scintillation
• 768 wavelength shifting fibers readout
• IU built custom digitizer: 12 bit, 20 MS / s
SciBath Detector for ANNIE -- R.L. Cooper
3
SciBath Detector• 80 L open volume of mineral
oil based liquid scintillator
• Neutrons recoil off protons, create scintillation
• 768 wavelength shifting fibers readout
• IU built custom digitizer: 12 bit, 20 MS / s
SciBath Detector for ANNIE -- R.L. Cooper
4SciBath Detector for ANNIE -- R.L. Cooper
5SciBath Detector for ANNIE -- R.L. Cooper
Sample Neutron Candidate Event
6SciBath Detector for ANNIE -- R.L. Cooper
Sample Muon Candidate Event
7SciBath Detector for ANNIE -- R.L. Cooper
n / m Particle Discrimination
8
• Low-light LED pulser (YZ)
• Use cosmic rays with known energy deposit (XY) requires previous calibration to count photons
• Detect 6 PEs / MeV want to improve
SciBath Detector for ANNIE -- R.L. Cooper
Calibrating the SciBath Detector
X EnergyDeposit (MeV)
Y ScintillationPhotons Collected
Z SignalVoltage (ADCs)
9
• Low-light LED pulser (YZ)
• Use cosmic rays with known energy deposit (XY) requires previous calibration to count photons
• Detect 6 PEs / MeV want to improve
SciBath Detector for ANNIE -- R.L. Cooper
Single-PE LED Calibration
Calibrating the SciBath Detector
X EnergyDeposit (MeV)
Y ScintillationPhotons Collected
Z SignalVoltage (ADCs)
10
• Low-light LED pulser (YZ)
• Use cosmic rays with known energy deposit (XY) requires previous calibration to count photons
• Detect 6 PEs / MeV want to improve
SciBath Detector for ANNIE -- R.L. Cooper
MIP Cosmic Ray Calibration Peak
Calibrating the SciBath Detector
X EnergyDeposit (MeV)
Y ScintillationPhotons Collected
Z SignalVoltage (ADCs)
11SciBath Detector for ANNIE -- R.L. Cooper
Fermilab Measurement Sites
MINOS Near
NuMI TargetBNB Target
10/11 – 2/122/12– 5/12
12SciBath Detector for ANNIE -- R.L. Cooper
MI-12 Neutron Background Run• Neutron flux ~20 m from
target
• In-line behind beam target (ground)
• 29 Feb. – 23 Apr., 2012
• 4.9x1019 total protons on target (POT)(4.5x1012 per pulse)
13SciBath Detector for ANNIE -- R.L. Cooper
MI-12 Neutron Background Run• Neutron flux ~20 m from
target
• In-line behind beam target (ground)
• 29 Feb. – 23 Apr., 2012
• 4.9x1019 total protons on target (POT)(4.5x1012 per pulse)
14SciBath Detector for ANNIE -- R.L. Cooper
MI-12 Beam Time Per PE “Group”• HIGH PE group shows
beam time structure
• MEDIUM PE group has few-ms excess – slower neutrons arriving later
• LOWEST PE group has significant excess – 200 ms lifetime from n(p, d)g neutron capture reaction
15SciBath Detector for ANNIE -- R.L. Cooper
BNB Neutron Energy Spectrum• En unfolded from PEs
spectrum simulation of detector response
• 2.44 ± 0.34 pulse-1 m-2 (En > 40 MeV)
• Lose sensitivity > 200 MeV;
• Neutron spectrum20 m from BNB
Raw PE Spectrum In-Beam
16SciBath Detector for ANNIE -- R.L. Cooper
BNB Neutron Energy Spectrum• En unfolded from PEs
spectrum simulation of detector response
• 2.44 ± 0.34 pulse-1 m-2 (En > 40 MeV)
• Lose sensitivity > 200 MeV;
• Neutron spectrum20 m from BNB
NOTE: variable PE bin width
Raw PE Spectrum In-Beam
17SciBath Detector for ANNIE -- R.L. Cooper
BNB Neutron Energy Spectrum• En unfolded from PEs
spectrum simulation of detector response
• 2.44 ± 0.34 pulse-1 m-2 (En > 40 MeV)
• Lose sensitivity > 200 MeV;
• Neutron spectrum20 m from BNB
Unfolded Neutron Energy Spectrum
Stat and Syst errors
18SciBath Detector for ANNIE -- R.L. Cooper
Direction Spectrum• High PE protons will be track-
like; can be imaged
• Principle component analysis yields eigenvector
• Back-projecting direction spectrum tends to point upstream of target ?!
• Tracking validated with cosmic rays and NuMI beam
High-PE, Proton Direction Spectrum
19SciBath Detector for ANNIE -- R.L. Cooper
Direction Spectrum• High PE protons will be track-
like; can be imaged
• Principle component analysis yields eigenvector
• Back-projecting direction spectrum tends to point upstream of target ?!
• Tracking validated with cosmic rays and NuMI beam
20SciBath Detector for ANNIE -- R.L. Cooper
Direction Spectrum• Sensitive to n(p,d)g reaction and see copious beam-correlated rate
• Accidental rates too high for capture-gating statistical sensitivity
21SciBath Detector for ANNIE -- R.L. Cooper
Current Studies• 2012 measurements at one
position with no shielding
• We are improving SciBath, building concrete shielding
• Locate a viable location for CENNS & CAPTAIN
• Survey the area withportable detector
22SciBath Detector for ANNIE -- R.L. Cooper
Current Studies• 2012 measurements at one
position with no shielding
• We are improving SciBath, building concrete shielding
• Locate a viable location for CENNS & CAPTAIN
• Survey the area withportable detector
beam
23SciBath Detector for ANNIE -- R.L. Cooper
Beam Off-Target Rates (> 0.5 MeV)
Stairwell• 9 m from Be
beam target• 1384 n / 1016 POT
Collimator• 8 m from Be
beam target• 5608 n / 1016 POT
50 m Absorber• 6 m from Fe
beam stop• 310 n / 1016 POT
2012 SciBath Loc• 20 m from Be
beam target• 211 n / 1016 POT
Target 90° FOX• 20 m from Be
beam target• 390 n / 1016 POT
Neutron spectrum unfolding underway
≈ 2.7×1016 / hr
24SciBath Detector for ANNIE -- R.L. Cooper
Summer 2015 Plans• Plan to measure near BNB target building for CENNS,
CAPTAIN, and general SBN program (May or June for 1 month)
• Measure in SciBooNE hall higher energy neutrino-induced neutrons: relevant for ANNIE, microBooNE, and SBN (May or June for 1 month)
• We want to help the neutron measurement efforts and are eager for additional support: siting, shifts, analysis, etc.