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May 17/22 PionLT/KaonLT Analysis Meeting Notes
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----------------------------------------------
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(Notes by GH and SJDK)
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Please remember to post your slides at:
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https://redmine.jlab.org/projects/kltexp/wiki/Kaon_LT_Meetings
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Present:
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Regina - Stephen Kay, Garth Huber, Nathan Heinrich, Ali Usman, Muhammad Junaid,
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Vijay Kumar, Love Preet
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CUA - Richard Trotta, Tanja Horn
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Ohio - Jacob Murphy, Julie Roche
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JLab - Dave Gaskell
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Richard
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-------
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- Updates to efficiencies list script
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- purpose is to get a consistent database of information
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- grab information from report files and other calculation scripts
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- Updated based on discussions/comments with SK/AU
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- Script to get info will follow soon
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- Starting with report file info
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- DG - Cherenkov efficiencies should probably not be run by run
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- TH - Some info only makes sense for certain settings, construct with sets
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of "if" statements
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- SK - Should probably have a list of settings, specify run type and
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kinematics etc, script will grab info relevant to run type
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- AU - Will have different report files for each run type
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- HeeP singles/HeeP coin/Prod/Lumi
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- SK/GH - Some info can come from runlist.csv file
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- SK - Yes, list needs to differentiate between scripts a little,
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different versions for different run types, e.g. Heep-Singles,
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Heep-COIN, Lumi, Prod
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- RT - Yep, will follow up and specify this in next pass of the list
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- HeeP Coin studies
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- Sent updated SIMC scripts to Ali
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- Wanted to scale up data from last time
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- Large SIMC/Data normalization difference
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- Input file issue - typo in input file
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- Momentum value issue (5 and 3 switched around)
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- Improved a little, but some issues still
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Note: in slides Blue=SIMC, Red=Data
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- Data seems to have a very different shape, seems to have a slope
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- JM - You should check that the correct optics matrix is used in SIMC
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- AU - Did you fix bug I found?
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- RT - Yes I corrected that too
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- Some quantities seem to actually look ok?
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- Shape of xptar/yptar/delta for the SHMS vastly different
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- GH/TH - Are the cuts clean? Are we 100% sure? What are they?
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- Seems to be a script issue? Integral seems to be varying between quantities
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- GH - *Should show some info demonstrating purity of experimental data,
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Pmiss/Emiss plots*
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- They are there and look clean
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- Need to fix binning?
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- GH - *It is absolutely vital that the Data and SIMC have IDENTICAL
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binning, can't rely on ROOT to choose the values, must do them
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manually*
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- SK - Need to be careful in controlling bin width
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- HMS also looks very different
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- Shape and integral look very different
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- *Could be a SIMC weighting issue?*
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- Had various issues due to python version difference between ifarm and
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laptop
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- TH - *Need to focus a little on just using one common system, reduce time
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replicating behaviour between different installations*
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- GH - Absolutely, vital for progress as a group
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- 2 week plan
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- fix Heep-COIN Data/MC issues
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- Binning issues
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- SIMC script updates for Ali
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- Efficiencies script first version
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- Use Ali's new report files in efficiencies script
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Ali
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---
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- Updated report file template, gets ~90% of the info RT showed on his list
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earlier
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- *EDTM numbers still temporary, JM will send update when it's available*
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- Naming scheme uses unique naming convention for each variable
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- Makes scripts that grab the info here much more useful
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- VK - Calorimeter efficiency info?
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- DG - Cal eff from hcana isn't great, need a separate script/study of this
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- It is useful to have as an online value to keep track if it's
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changing or not, guides you to a hardware problem potentially
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- *The issue is that it's hard to get a clean electron sample inside
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hcana. Need to do a dedicated study to select electrons
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- sometimes have to determine Cal eff from elastics data,
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parameterize and extrapolate to prod data conditions*
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- SK - Online version is there and working for this purpose?
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- DG - Yes but really only restrict use to a stability/hardware check
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- Hodoscope efficiencies are calculated, plane by plane
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- DG and Mark Jones pointed out where to look for this and check it's ok
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- Current number is more trustworthy
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- Added in geometrical cut on the aerogel, tray dependent
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- Got numbers for one tray, RT will send the others
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- 2 week plan
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- Will look at 8.2 and 6.2 GeV hodoscope calibrations
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- TH - is your work coordination efficient? Don't want you to be waiting on
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other people to make progress
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- AU - not waiting too much on other people right now
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Vijay
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-----
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- Initial offsets study to improve HeeP coin studies for 3.9 GeV data
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- Improved fits and distributions slightly
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- DG - What is different between the new/old?
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- VK - Updated spectrometer offsets in the SIMC input file, x/y for e/p in
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SIMC
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- DG - At the FP?
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- GH - No, at spectrometer entrance, not the FP
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- DG - change in x gives an effective momentum shift
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- VK - Still need to determine momentum offsets
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- GH - Q for TH/DG, should offsets only be done after running HeePCoin
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program?
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- TH - Where did spectrometer offsets come from?
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- VK - Just by eye, adjusting them
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- TH - *Want to minimise #offsets used*, not clear what offests at
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the minute mean
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- DG - *Should in principle start with survey values for the
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spectrometer x,y,zoffsets*
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- shift VJ observed in xfp came from an x-spectrometer offset
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can do instead from a momentum offset, which is more universally
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applied to all settings
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- Should not be much x offset for either spectrometer, should use
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HeePCheck program following a run with survey values
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- TH - Could just start with 0 x,y,z offsets?
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- DG - Offsets are correlated
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- Probably should not start by adjusting these numbers
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- TH - Can't really just make up spectrometer offsets, should start
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from the survey
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- DG - *Start with HeeP program, constraining energy/momentum in both
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spectrometers at the same time*
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- Got derivatives, these show how much things would change by *if*
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you moved them
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- TH - *Be careful with the sign in the output of the HeeP check code*
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e.g. in what direction do you need to change things if you
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observe a dW offset of +2 or -2 MeV?
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- Code outputs what happens if you shift E/Theta_e/Theta_p/p_e/p_p
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by 1 unit (0.1%)
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- Offsets were previously implemented into SIMC
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- SIMC input file has no momentum offset, so what do you do if there's
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a momentum offset?
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- Set central momentum in SIMC file by corresponding amount
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- GH - Change in the data too by changing standard.kinematics?
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- DG - *Used to have a kinematics offset file in hcana*
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That makes it easy to track that the correct offsets are
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applied to all of the data
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- SK - If this *doesn't* still exist, should be easy to modify hcana
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to find and use this
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- DG - *also need to be careful that SIMC automatically corrects for
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any applied offset to get the correct physics values*
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- TH - Need to be careful and avoid double correcting offsets between
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data and SIMC
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- momentum offset was difficult to implement in SIMC. In Fpi-2
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analysis, TH/DG had to make changes to the SIMC code to do this
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- *students should consult DG/TH if there is a need to do this*
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- 2 week plan
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- redo offsets, start to include effs in Heep-singles, Heep-coin analysis
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Jacob
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-----
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- RT, *need to be careful when looking at 6.59 GeV/C HMS data (10.6 GeV, 09/18,
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NMR value drifting, hence central momentum drifting)*
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- Run numbers 4805 - 4825, Sept 29/18
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- SHMS defocused hodoscope calibrations
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- September 2021 defocused run, 11799
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- Defocused has slightly larger wiggle in the xfp/yfp vs beta plots
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- quantitative measure of calib effectiveness is sigma_beta
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- DM says ~0.028 is good
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- NH - MJ says can keep time walk corr fixed & adjust velocity param
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- Defocused run seems to perform very well over ~4 months of data
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- Should be done on run plan soon
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- 2 week plan
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- Improvement on switching velocity parameters only to see if further
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improvement
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- Hodoscope fitting method for velocity - deep dive
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- Finish up run plan
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- AU - Batch script for hodoscope calibrations
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- JM - Yes it's ready, will push it, should work for KaonLT fine
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- *May need to make PID cut changes for time walk and velocity scripts*
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Junaid
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------
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- Working on the run plan, 6 lumi scans, 2 for each beam energy
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- Updated HeeP, expected charge and #pions
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- Almost done with latex file for shift worker document
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- Working on calorimeter calibrations
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- using Bill Henry's code
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- c-library issue, unclear where this is or how to get it
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- Grab from cdaq? Assuming it works fine on cdaq
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- 2 week plan
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- Finish run plan
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- 4 HeepCoin settings for some energies, one has a very high max SHMS angle
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- Max angle is 37.95 now, just fits within max remote operation range
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- DG - Any crazy large angles needed on the HMS side?
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- NH - Goes to ~42 degrees max
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- GH - CaFe goes to ~67 degrees max so we're nowhere near
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- DC and calorimeter calibration offline updates
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Nathan
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------
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- Working on run plan too, finished a draft of the SW instructions for 6.4 GeV,
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distributed
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- Not looked at calibrations much yet
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- Comprehensive exam prep
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- Did replay some physics settings, so could check Cherenkov calibrations
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quite quickly
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- 2 week plan
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- Run plan should be done
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- Cherenkov calibrations - First pass
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- NGC script not working?
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- JM - Script is very simlar to HGC code, should be roughly working, need
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to get geometry of mirrors and NGC position in there and correct
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- Does it have a 5cm vertical offset like the HGC? GH doesn't think so
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GH comment on pdf for shift workers (SW)
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- In spreadsheet, diamond cut applied, NOT on SW document
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- *SW needs nominal online cuts w/o diamond so that SW/RC know when to move to
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next setting*
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- For settings where spreadsheet lists two model values, Use the more
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pessimistic model for timings on the run plan document
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Next Meeting - 22-May-31 at 15:00 EDT
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