The n-3He Experiment at SNS : Meetings


Collaboration Meetings


Review Meetings

- Preliminary slides or pdf
- Preliminary slides of the chiral effective field theory study(pdf )

Weekly n3He Phone Conferences

Wednesdays at 16:00, SNS phone conference line: 877-930-6144, id: 8420216#




Weekly n3He DAQ Phone Conferences

Wednesdays at 15:00, SNS phone conference line: 877-930-6144, id: 8420216#

Weekly Meeting 10/29/14

Agenda 1(IRR) Agenda 2 (Worklist)

Weekly Meeting 11/05/14

Agenda 1(IRR) Agenda 2 (Worklist)

Weekly Meeting 11/12/14

Agenda 1(IRR) Agenda 2 (Worklist)

Weekly Meeting 11/26/14

Worklist(link) IRR List(link)

Weekly Meeting 12/10/14

Up Stream 1st Beam Scan Result(pdf)

Weekly meeting 12/17/14

Beam Profile (Kabir's analysis)
Chamber Beam data (pdf)

Weekly meeting 13/05/15

U/D Asymmetry Kabir's Analysis v0 (pdf)

Weekly meeting 20/05/15

U/D Asymmetry Kabir's Analysis v1 (pdf)

Weekly meeting 7/14/15

n3He Run Status for beam cycle 1 (pdf)

Weekly meeting 08/19/15

n3He Target Charge Collection Simulation ( pdf)

Weekly Meeting 9/29/15 : Nailing Down LR Asymmetry

Kabir's Analysis (pdf)

Weekly Meeting 10/05/15

Wire Map from Collimation Scan(pdf)

Weekly Meeting 11/02/15

UD Analysis of all runs till recently (pdf)

Weekly Meeting 11/16/15

Possible sources of anomaly in UD asymmetry (pdf)

Weekly Meeting 11/23/15

(Carlos) PC and PV Physics Asymmetries.(pdf)
MTSU Analysis(pdf)

Weekly Meeting 11/30/15

(Carlos) PC and PV Physics Asymmetries.(pdf)

Weekly Meeting 12/07/15

MTSU Analysis (pdf)
(M. McCrea) Chamber Stability Over Time(pdf)

Weekly Meeting 12/14/15
Wraparound spectra for different chopper settings(pdf)
Asymmetry for different configs(pdf)

Weekly Meeting 1/11/2016

End of run measurements(pdf)

Weekly Meeting 1/25/2016

(M. McCrea) Target Chamber Voltage Scan Results (pdf)
(Kabir) LR and UD raw asymmetry from pair analysis(pdf)

Weekly Meeting 2/15/2016

(M. McCrea) Target Chamber Voltage Scan Results (pdf) (full list of plots and fit results here)

Weekly Meeting 2/22/2016

Time bins and start spin dependence for LR asymmetry (pdf)
(M. McCrea) Quick Amplification Calculations (pdf)

Weekly Meeting 3/07/2016

(David Bowman) Sources of Horns (pdf)

Weekly Meeting 3/14/2016

(M. McCrea) Chamber Voltage Scan Results and Initial Intensity Scan (pdf)
(Kabir) Asymmetry as a function of distances from dropped pulses (pdf)

Weekly Meeting 3/28/2016

Post dropped pulse cut and DST with tbins(pdf)

Weekly Meeting 4/04/2016

False asymmetry from wrap around(pdf)

Weekly Meeting 4/25/2016

Weighted Asymmetry(pdf)

Weekly Meeting 5/2/2016

Beam variation following dropped pulse (pdf)
Weighted Asymmetry and Beam Variation (pdf)
Analyzing False Asymmetry (pdf)

Weekly Meeting 5/9/2016

Pedestals and "Negative Image" Results (pdf)
Perfect Pulse Analysis to Extract Pedestal (pdf)

Weekly Meeting 5/16/2016

Perfect Pulse Analysis with full UD dataset (pdf)
Fourier analysis of pulse Sequence (Chris Crawford and Chris Coppola) (ppt)

Weekly Meeting 5/31/2016

Pedestal Observations (Vince C.) (pdf)
Fit results from perfect pulse analysis (Kabir)(pdf)

Weekly Meeting 6/6/2016

n3He Analysis Protocol (David) (pdf)
Pedestal Subtracted LR Asymmetry (Kabir) (pdf)
Comparisons between A/B run sets and even/odd sums (Vince) (pdf)

Weekly Meeting 6/13/2016

Pedestal Subtracted LR and UD Asymmetry (pdf)

Weekly Meeting 6/20/2016

Discussion of Analysis Procedure (David) (pdf)
Correlation Calculation Part 1(pdf)

Weekly Meeting 6/27/2016

Updated Analysis Procedure (David) (pdf)
Correlation Calculation Part 2 (pdf)

Weekly Meeting 7/11/2016

Analysis Procedure (David) (pdf)
Correlation Calculation (Kabir) (pdf)
polarization of neutrons outside the primary pulse (Vince) (pptx)

Weekly Meeting 7/18/2016

polarization of neutrons outside the primary pulse - II (Vince) (pptx)
Correlation Calculation (Kabir) (pdf)
n3He Open Issues (David) (pdf)

Weekly Meeting 7/25/2016

M1 Signal and Chopper Phases Cut (pdf)
Comparison of old and new ionization curves (png)

Weekly Meeting 8/1/2016

M1 Signal and Chopper Phases Cut (pdf)

Weekly Meeting 8/8/2016

Simulation of collimator scans (pdf)
M1 Signal and Chopper Phases Cut (pdf)
Comparison of old and new ionization curves [David's new table] (png)

Weekly Meeting 9/26/2016

Geant4 Simulation (Michael Gericke) (pdf)

Weekly Meeting 10/10/2016

Comparing Collimation Data with Chris Crawford's Simulation (pdf)
Geant4 Simulation (Michael Gericke) (pdf)

Weekly Meeting 10/24/2016

The n-3He Simulation Using Geant4 (Kabir) (pptx)

Weekly Meeting 11/14/2016

Discussion on Measurements for DAQ + Pre-amp paper (pdf)

Weekly Meeting 11/21/2016

Outline for DAQ + Pre-amp paper (David) (pdf)

Weekly Meeting 11/28/2016

n-3He Simulation Using Geant4 (Kabir) (pptx)

Weekly Meeting 12/05/2016

Update on n-3He Simulation Using Geant4 (Kabir) (pdf)

Weekly Meeting 12/12/2016

Thermal Averaged n-3He Cross Section (David) (pdf)
Outcome and Validation of n-3He Simulation using Geant4 (Kabir) (pdf)

Weekly Meeting 1/13/2017

Final Report on n-3He Simulation (Kabir) (pdf)

Weekly Meeting 1/20/2017

LR and UD Asymmetry Extraction for n-3He Part-1 (pdf)

Weekly Meeting 2/10/2017

Analysis Outcome for n-3He Data Part-2 (pdf)
First analysis of TOF dependence of the Raw asymmetry on wire 1 (png: A_LR_wire1 vs TOF bin)

Weekly Meeting 2/17/2017

Analysis Outcome for n-3He Data Part-3 (pdf)

Weekly Meeting 3/3/2017

Analysis of TOF dependence of LR PC asymmetry: (pdf) Chris and Kabir
We fit the data to A = a/(t+b) where b was the T0 delay, which should be about 42 bins.
We get a = -7.3+/3 x 10-6, b=15+/-12.
Analysis in terms of sqrt(E) instead of TOF: (pdf)
A single parameter fit to A = a sqrt(E), gives A=-33+/-4 x 10-7.

Weekly Meeting 3/10/2017

Ionization derivation (Chris) (pdf)
n-3He PA paper outline (David) (pdf)

Weekly Meeting 4/21/2017

Systematics for the experiment (pdf)

Weekly Meeting 4/28/2017

Systematics for the experiment (pdf)

Weekly Meeting 5/5/2017

Systematics for the experiment (pdf)

Weekly Meeting 5/19/2017

Systematics for the experiment (pdf)

Weekly Meeting 6/23/2017

Beam Off Asymmetry Initial Analysis (McCrea) (pdf)

Weekly Meeting 6/30/2017


Progress on Beam Off Asymmetry Initial Analysis (McCrea) (pdf)

Weekly Meeting 7/7/2017

Double-peaking in beam-off asymmetries: a fishing expedition (Mahurin) 2017-06-30.pdf
Source for talk, including Python code to generate plots: do
"git clone basestar:~mahurin/n3he_py.git", then examine talks/2017-06-30.org

Weekly Meeting 7/21/2017

Instrumental Asymmetry Changes Over Runs (McCrea) (pdf-r1)

Weekly Meeting 08/18/2017

Instrumental Asymmetry Changes Over Runs 2 (McCrea) (pdf)
Instrumental Asymmetry Preliminary Time Bin Averages (McCrea) (pdf)
Path Length Report (Coppola) (pdf)

Weekly Meeting 08/25/2017

Instrumental Asymmetry - Wire Yield Changes (McCrea) (pdf-r1 )

Weekly Meeting 09/08/2017

Investigations of different frequency components in the M1 signals (Crawford/McCrea) (tgz, large timescale, short timescale).
The ROOT session log is included in the tgz file, so you can try similar investigations.

Weekly Meeting 09/15/2017

Instrumental Asymmetry - Peak Detection Method (McCrea) (pdf)

Weekly Meeting 09/22/2017

Instrumental Asymmetry - Run Checking (McCrea) (pdf)

Weekly Meeting 09/29/2017

Instrumental Asymmetry - Full Run Range 1 (McCrea) (pdf-r1)
Note: The slide 19 average instrumental asymmetries are not correct, see the 10/06/2017 presentation for corrected values.

Weekly Meeting 10/06/2017

Instrumental Asymmetry - Single Wire Instrumental Asymmetry Results (McCrea) (pdf-r3)

Weekly Meeting 10/20/2017
Instrumental Asymmetry - Method Update (pdf-r1)
Histograms of the instrumental asymmetry calculated for each wire over the summer running period:pdf
No averaging was performed before filling, so each histogram has all 676*12498*40 calculated asymmetries.

Weekly Meeting 11/03/2017

Instrumental Asymmetry - Final Results Instrumental Asymmetry Results (McCrea) (pdf)

Weekly Meeting 11/10/2017

Instrumental Asymmetry - Covariance Weighting of Time Bin Asymmtries (McCrea) (pdf)

Weekly Meeting 11/17/2017

Instrumental Asymmetry - Tuesday Instrumental Asymmetry Final Result (McCrea) (pdf)

Weekly Meeting 11/24/2017
Signal Frequency Analysis - FFT Wire Yield Method (McCrea) (pdf)

Weekly Meeting 12/08/2017
Autocorrelations of run 38100 (Crawford) (pdf)

Weekly Meeting 12/22/2017
Signal Frequency Analysis - FFT Wire Yield Method 2 (McCrea) (pdf)

Weekly Meeting 01/05/2018
Signal Frequency Analysis - FFT Wire Yield Method 2 (McCrea) (pdf-r1)

Weekly Meeting 01/12/2018
Signal Frequency Analysis - Effect of Sample Time on FFT Results (McCrea) (pdf)
Signal Frequency Analysis - Initial FFT Results (McCrea) (pdf)

Dave Bowman - Damped Harmonic Oscillator Driven by White Noise
- DHO Values, histograms, and Phase in a Sine + Cosine Fit (docx , pdf)
- Spectral Density Plots (yellow lines) Integration Window Response Function (blue lines) (pdf)

Weekly Meeting 01/19/2018
Signal Frequency Analysis - Initial Comparison of FFT to Wire Signals and Future goals (McCrea) (pdf)

Weekly Meeting 02/02/2018
Topics for Discussion (Bowman) (docx , pdf)

Weekly Meeting 02/09/2018
Files for Low Frequency FFT(zip)

Weekly Meeting 02/23/2018
Signal Frequency Analysis - FFT Summary (McCrea) (pdf)

Weekly Meeting 04/06/2018
Instrumental Asymmetry Analysis - Re-Calculation of Results Tracking Spin Sequence (McCrea) (pdf)
Beam-off Noise Asymmetry Analysis (Gericke) (pdf)

Weekly Meeting 04/13/2018
Beam on Physics Asymmetry (Gericke) (pdf)
Preliminary April APS Talk (McCrea) (pdf)

Weekly Meeting 04/27/2018
Beam on Physics Asymmetry (Gericke) (pdf)

Meeting minutes for DAQ, Integration and Alignment meetings can be found under corresponding sections.