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2019-03-18 amp-evolv » History » Version 7

Rogers, Chris, 19 March 2019 12:10

1 1 Rogers, Chris
h1. 2019-03-18 amp-evolv
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17:00 GMT Monday 18th March
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http://mice.iit.edu/phonebridge.html
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h2. Actions
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intro (KL)
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-0th paragraph add section headings
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-1st paragraph needs revision; check historical details
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-3rd paragraph need caveat on e+e-
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4th paragraph need frictional cooling
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observables (CR)
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-introduce cooling formula; but phrased ito amplitude (FD)- -_CR to integrate with paper (CR)_-
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-remove sentence regarding 9% centile just before eq 1-
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-Add a sentence regarding "human readable" what is kNN algorithm- -_FD to check CR's understanding (FD)_-
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-Joining sentence between "observables" and "MICE"-
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MICE
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(CR) -contact Jason Tarrant and photo repro regarding image- _for now keep working on it amongst ourselves_
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(FD) -upload schematic latex to overleaf-
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(FD) -Add labels to schematic; make lH2 not LiH absorber; general "look and feel" stuff-
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(CR) -remove phase space figure to MICE note; consider 2d amplitude plot instead a la Francois thesis figure 6.25-
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Results
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(CR) francois asked by email - why is mc_reco sample size not same as reco sample size (they are supposed to be same sample _it is impurity at high radius (tracks in MC fiducial but not data fiducial); is impurity properly handled by correction mechanism? Need to check; relies on migration matrix non-unitary_
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(CR) -investigate the 17.5 mm bin issue esp at 10-140- _could check rebinning but low priority for now_
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(CR) -investigate the scraping aperture _looks like it is MC offset_-; add a vertical line corresponding to the scraping aperture; comment in text
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(FD) -fractional emittance is better than most significant bin as a table-
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(FD) -need to do the efficiency correction on fractional emittance-
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(FD) -need to do the efficiency correction on density-
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(CR) -Check apertures in lH2 vs None absorber; KL claims window aperture should be mostly not there in "None"-
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(CR/FD) -Check systematic for density plot in TKU 10 mm; why is SSU CC giving such large uncertainty?-
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h2. Notes from CM53
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Try Nature before Nature physics
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Fig. 1 - schematic
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(CR) -Preferably plot B_{z}, or introduce an arbitrary factor of -1 after the absorber, or label as |B|-
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(CR) -Note that the sigma(x) plot comes from linear beam optics calculation-
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Fig. 2 - phase space 2d plots
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(CR) Interesting that there is a cliff in the x-py and y-px plots. Is this diffuser aperture (or some other aperture)
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(CR) If show Phase space plots, put one beam ellipse on
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Fig. 3 - amplitude pdf
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(CR) Add the amplitude pdf plot without corrections to the supplementary information
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(CR) -Plot amplitude pdf as a histogram or without horizontal errors-
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(CR) Afterwards, JHC pointed out that log(n) vs sqrt(A) is linear for Gaussian beam. It might just confuse people to plot it.
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(CR) Vertical axis label is wrong. Normalisation needs to be explained.
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Fig. 4 - pdf ratio
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(CR) -Make MC less visible in pdf ratio plot - it tends to dominate-
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(CR) Increase the MC stats (implies going to production MC, it is time)
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Fig. 5 - cdf ratio
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(CR) -The number of significant figures in the table is too great. Need to understand the difference between the errors for different data-
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(CR) -John and KL asked for raw pdf numbers-
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(CR) -Discussion of which bin to choose and how to quantify the level at which we observe cooling-
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* Soler suggested CLS method
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* -Others suggested looking at significance of first bin rather than most significant bin-
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(CR) -Move the points to the bin edge, not bin centre; look and feel issues-
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(CR) Check systematic error correlations are handled correctly
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(CR) -General - check the systematic error is reasonable; e.g. do we need to include big error for SSU and for SSD; check we only use -ve error in SSU-
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(CR) General - move to production
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h2. Other jobs
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(CR) -Check - why is the systematic error so much higher on density plot than e.g. amplitude pdf plot?-
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(CR) -Add labels to schematic-
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(CR) Fix or explain kink in 10-140 plot amplitdue pdf
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(CR) Write methods section
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(CR) Update MICE Note
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(FD) -Add comment noting the beam used for the Poincare plot-
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(FD) -Add date to the schematic-
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(ALL) Stats test for table
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(CR) Data to francois for poincare section