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Kaon LT Meetings » History » Version 2

Richard Trotta, 07/16/2018 12:01 PM

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h1. *Kaon LT Meetings*
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h2. February 22, 2018
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*Links to talks->* "Andres":https://redmine.jlab.org/documents/19
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*  Discussion of Andres' slides on elastic W calculation in hcana - initial issue with negative W values seems to be due to outdated information in standard.kinematics file. Additional investigation ongoing.
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* Brief description of Samip's work - working on coincidence timing decoding with JLab staff and re-optimization of kinematics
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* Discussion of Richard's slides on run plan kinematics and preparations -
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** everyone agrees that in general want to have as many L/T cross section separations as possible in a robust run plan balancing statistics vs. systematics
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** before actual run may want to do a 3D optimization in all kinematic variables to get the best possible delta(epsilon) for the L/T separations
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** for each setting will need 1-2 shifts for calibrations - need to negotiate with other experiments in run group
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** kinematics plots W-Q2 show that still need to do some optimization
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** run sheets: include raster size, update coincidence count labeling, and carbon target labeling
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* Discussion of next meeting. Garth at JLab 8-16 March - might have meeting during that time.
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* *Action Items:*
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** Post slides/notes from this meeting and procedure to set up hcana in Redmine (Tanja)
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** Update run sheet and kinematic optimization for W/Q2 (Garth)
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** Circulate elastic calculations for kinematic settings (Samip)
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** Continue investigation of elastic data and run plan kinematics (Andres/Richard)
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** Test software installation instructions (Pete)
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** Draft email to JLab management about need for small angle beam pipe - need to have HMS minimum angle of less than 13 degrees for kaon L/T separations (Tanja) 
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h2. March 29, 2018
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*Links to talks->* "Richard, ":https://redmine.jlab.org/documents/16 "Samip":https://redmine.jlab.org/documents/27
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* Details of adding points to fall run plan - will be ready sooner, likely in week of 4/1 (Garth, Samip, Tanja)
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* Luminosity scans (Ryan, Andres, Richard, Pete)
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* Macros, SIDIS analysis (Hem, Anashe)
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* Elastic data (TBD)
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h2. April 26, 2018
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*Links to talks->* "Richard,":https://redmine.jlab.org/documents/18 "Ryan, ":https://redmine.jlab.org/documents/20 "Samip":https://redmine.jlab.org/documents/25
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* Discussion luminosity scan analysis (earlier scan) - Richard
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** Shown is a scaler-based analysis using scalers from report file and from ROOT tree - the values are different, why that is has to be checked
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** Notes on efficiencies in report file:
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*** DT (EDTM) is not electronic deadtime. Instead use for now 50ns* trigger rate for HMS and 100ns* trigger rate for SHMS
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*** Cherenkov efficiency seems low (check if that is due to PID, thresholds, pi/e, etc)
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*** Tracking efficiency needs to be checked
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*** 3/4 trigger efficiency seems ok
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* Discussion luminosity scan analysis (later scan) - Ryan
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** Fewer carbon runs than earlier scan
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** Shown is a tracking-based analysis using data from the ROOT trees
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** First results for carbon, LH2, and LD2, but efficiencies need to be checked
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* SIDIS analysis - Hem
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** Shown is a data/MC comparison for different kinematic settings. Agreement in shape is very good. Normalization has yet to be applied.
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** Discussion about agreement in z and apparent offset - relation of this offset with spectrometer offset
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* Analysis of exclusive events in SIDIS - Samip
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** Shown is a look at the first kaon events in exclusive limit of SIDIS data
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** Ongoing work on implementing coincidence time into tree
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* Discussion of run plan, and in particular possible low Q2/low energy
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** Assume that kaon low Q2=0.4 already included - have kinematics with specified beam energies, if needed
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** For pion form factor and LT, have two possible settings that can use the prescribed beam energies: Q2=1.45 and 0.35 GeV2 - prioritize towards the higher Q2 as not as sensitive to offsets
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** Garth will put this together in a draft email
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h2. May 10, 2018
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*Links to talks->* "Hem":https://redmine.jlab.org/documents/24, "Richard":https://redmine.jlab.org/documents/23, "Ryan, ":https://redmine.jlab.org/documents/20 "Samip":https://redmine.jlab.org/documents/26
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* Luminosity Scans January 2018 (Richard)
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** Tracking-based analysis for Runs 1415-1423, .. for now focus on HMS, typical HMS S1X rates are <
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** Cuts applied: PID for electrons (Cer, Cal), acceptance (delta)
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** Efficiency calculation was investigated in detail and applied using scalers from trees
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** Results for carbon (normalized to 30uA) show large variation - need to understand
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** *Next steps:*
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*** Double check calculation of computer lifetime, look for differences in TRIG and PRETRIG scalers
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*** Check stability of pre-scale (Ryan saw changes within runs)
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*** Check if detector calibrations for runs are implemented correctly
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*** Analyze with Ryan's cuts
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* Luminosity Scans April 2018 (Ryan)
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** Confirms Richard's earlier finding that scaler-based analysis is not reliable and that it's best to analyze event-by-event
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** Tracking-based analysis for runs 2073-2095
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** Cuts applied: PID for electrons (TOF, Cal, Chi2), acceptance (delta and angles), BCM4a
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** Included most recent detector calibrations in replay of these runs
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** Efficiencies from report file mainly, may need to update tracking efficiency implementation
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** Found that calculations of computer deadtime requires different set of scalers for runs from January to those from April 2018
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** Results show carbon yields consistent with unity within error (0.5% error bars), and boiling for hydrogen and deuterium
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** *Next steps:*
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*** Check tracking efficiency
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* *Global comments on Luminosity Scans (so far)*
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** April 2018 scans show hydrogen and deuterium target boiling on level of 3-4%, Carbon is consistent with no boiling, as expected - based on description, new targets are expected to have less boiling than those used previously, e.g. in FPI2. Double check this.
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** Efficiencies in report files need to be updated, e.g. CPU deadtime (Richard)
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** Check if BCM4a is the one closest to the target - get a map of the hall (Richard, Ryan)
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** Uncertainties on current
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** Detector calibrations
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** HMS vs. SHMS
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* eK+ coincidence time from SIDIS Spring 2018 run (Samip)
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** Worked with Mark Jones on coincidence time calculation - now available in hcana (see Samip's 10 May 2018 email for more details)
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** runs used in this analysis: 3423 with Q2=3.1 GeV2 and W=2.78 GeV
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** Coincidence time spectrum shows peak separations >2 ns corresponding to different accelerator frequency
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** Missing mass spectra: Kaon peak clearly visible, also see pions even after cuts
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** Found that pions appear localized in phase space - seems to be due to end point in kinematic phase space
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** *Next steps:*
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*** Look for a run with kaon momentum closer to 3 GeV/c (aerogel threshold is ~3 GeV/c for kaons for n=1.015)
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* Yield normalized ratios from SIDIS (Hem)
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** Yield ratios of data to MC match well in shape, but normalization seems not quite right
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** *Next steps:*
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*** Check if efficiencies, currents, run time etc. are taken into account correctly
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h2. May 17, 2018 
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*Links to talks->* "Richard":https://redmine.jlab.org/documents/29, "Ryan":https://hallcweb.jlab.org/DocDB/0009/000968/001/Presentation.pdf, "Samip":https://redmine.jlab.org/documents/30
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* Luminosity scans (Richard, Ryan)
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** Carbon scan from April seems consistent with no boiling, LH2 and LD2 show deviation from unity, should check effect of EDTM events on efficiencies
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** Carbon scans from January (low rates) have large deviations from unity, in particular behavior at higher currents (>40uA), e.g. cpu dead time, that is not yet understood
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** discussion about pre-scale factors
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* Discussion about Richard's script extracting and printing information from report files and trees including histograms
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** Add option for looking at yields with cuts on cointime, target window, and missing mass
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** Add option to look at real peak vs. background level
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* H(e,e'p) kinematics investigation for fall run (Samip)
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** Optimal range is between electron angles of 17-20 degrees, time required ranges from ~1 hour at 17 degrees to ~3 hour at 20 degrees, other angles may be of interest for disentangling charge and current dependent effects
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* *Action Items*
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** Luminosity scans at low rates from January (Richard)
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** Luminosity scans from April with corrected efficiencies, e.d. DT (Ryan)
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** H(e,e'p) and H(e,e') kinematics for upcoming Kaon LT run (Samip)
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** Kaon LT detailed run plan (Garth, Pete, Tanja)
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** Preparations, e.g. report files, diagnostic histograms and real time monitoring, shift worker instructions, optimization of trees (all)
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h2. May 31, 2018
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*Links to talks->* "Samip":https://redmine.jlab.org/documents/30
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h2. June 28, 2018
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*Links to talks->* "Richard":https://redmine.jlab.org/documents/34
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* Ryan 
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** resolving differences between his analysis and Richard's
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* Richard
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** Discussed with Mark Jones and is cross checking his January luminosity scan analysis against Mark's. Realized that BCM calibrations (gains, offsets etc) are different - currently working on fixing that, presents current results - low curent point is ~10% below unity, discussion that this seems to indicate that BCM offsets are the issue as low current points would be most sensitive, is planning to also double-check the BCM calibration procedure - had discussion with Dave Mack at JLab
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** Presents a script developed for luminosity scans that determines yields for a run number input on command line. Discussion this could be good to adapt for kaon counting during experiment.
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h2. July 11, 2018
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*Ongoing Tasks->* #381 #382 #383 #384
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