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Nov 2/22 PionLT/KaonLT Analysis Meeting Notes
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(Notes by GH and SJDK)
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Today: KaonLT will be discussed first
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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 - Garth Huber, Stephen Kay, Ali Usman, Alicia Postuma, Vijay Kumar,
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Nathan Heinrich, Muhammad Junaid, Love Preet
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CSULA - Konrad Aniol, Erika Gwin
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Ohio - Jacob Murphy, Julie Roche
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CUA - Richard Trotta
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JLab - Dave Gaskell
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FIU - Pete Markowitz
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- Garth notes he'll have to leave in ~1 hour
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- Vijay has some internet issues so will be slightly late
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Richard Updates
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LT separation code
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- Debugged issues with Bill's code
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- Inputs our root files, gets his root files out
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- Need to update framework, some variable naming, etc. but otherwise the
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modifications are complete
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- Bill will be giving a talk to us next week
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- GH suggests sending questions to Bill via email in advance
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Luminosity scans
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- looked at new runs taken during SIDIS that Peter Bosted suggested in the
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analysis meeting
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- these are at 10.6 GeV with SHMS negative polarity, so very useful
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- Runs 7948-7952 Carbon (neg polarity) shown
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- rate dependence looks generally pretty good
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IMPROVEMENTS MADE:
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- Looked at ELCLEAN vs ELREAL in scaler analysis
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- some rate dependences were improved, but others were worse, details not
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given
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- Switched back to ELREAL for now
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- found an error in SHMS code, should have EventType=1&3 for everything,
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some were missing #1 by mistake
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- opened up current threshold for some runs
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- GH: Was the 0.1 uA offset discussed previously added? RT: No.
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- carbon runs 7948-52 fairly flat ~5% variation, but a low current offset
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of a few percent would make this even flatter
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- 5uA run ~2% high?
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- would match with suggested ~0.1uA offset
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- runs 7954-60 show small evidence of LH2 boiling, consistent between both
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spectrometers
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- 10.6 GeV runs 5154-5299 still have some weird effect on the SHMS carbon
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runs
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- HMS runs look very good
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- runs 5175-5301 improved a lot after EventType fix
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- 10.6 GeV runs Peter mentioned look very good overall (5351 - 5358)
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- Highest current point looks odd (current cut issue?)
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- Carbon basically done, LH2 needs a little fixing (plots)
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- Cryotarget boiling correction should be the same at all beam energies
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- Qualitatively, looks like this may be the case
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- Dummy target Lumi scan up to 40uA available too
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- Will post plots on Redmine
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Ali Updates
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-----------
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HeeP Coin offset study update
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- Peter looked at 6.2, 8.2 and 10.6 GeV pion/kaon data from KaonLT
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Got a correction factor of 0.998 on HMS central momentum
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- Calculated from Holly's formula
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- Momentum correction was applied already in Holly's magnet setting
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program in PionLT?
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- *Jacob* will follow up with Holly and figure out when this was
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actually applied
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- DG - At low momentum, this correction had some weird behavior
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- Peter has a vertical angle offset in HMS (~2.7 mrad)
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- No SHMS central momentum or angle correction
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- His study showed pion/kaon MM peaks at roughly the correct place (~2-3 MeV
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off)
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- Ali shows his before/after plots (of W) for each beam energy using Peter's
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offsets
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- 6.2 GeV, correction overcorrects the data. No offset actually gives
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best result
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- 8.2 GeV, correction improves things a lot
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- 10.6 GeV, correction improves things, but now the peak shift is in the
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opposite direction than with no offset
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- See slides for P_HMS/P_SHMS values
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- Still need to add vertical angle offset, but this won't really shift W
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- JM - 6.59 GeV/c central momentum offset for the HMS for the runs Ali was
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showing changed a lot
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- digs up some old tables from his earlier analysis to demonstrate this,
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runs 4806-4825 (KaonLT 10.6GeV delta scan)
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- DG points out that the angle was changing here too in some cases
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- Even still, there are some run to run shifts in this scan
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- NMR readback was shifting a lot in these runs, was the dipole actually
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locked here?
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- Is there an EPICS variable for the NMR lock?
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- If not, there probably should be
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- The MyaPlot archive will show whether the NMR was locked or not for
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these runs
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- Run sheets indicate there was some adjustment of the HMS between 4806
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and 4808
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- most likely the shift crew had the NMR locked, but hadn't waited
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long enough for the HMS to settle and got an alarm after run 4806
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(such as at beginning of junk 4807) and made an adjustment before
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4808 to bring things to spec
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- JM, AU, RT, VK will continue to *discuss* this offline
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- Ali shows before/after emiss plots (with Peter's offsets)
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- None of them look great
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- 8.2 GeV looks "best", data looks broader
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- 6.2 GeV looks worse than with no offset
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- pmy looks quite different between data/SIMC
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- No vertical offset applied here though
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*IMPORTANT*
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- RT - Peter has some different tweaks for SIMC, for example he
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re-calculates all variables on his own to be sure things are done the same
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way for both MC and data
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- the fact that Peter sees good agreement between Data & MC but Ali doesn't
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with same offsets should be a real concern
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- the different variable definitions v.likely a contributing factor
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- DG: Resolving this should be a priority!
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- hcana variable definitions are more straightforward than in SIMC, so
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suggestion is to modify SIMC to use identical formulas as hcana
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- *Richard* will take a look at adding in new SIMC variables where they're
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calculated to match hcana
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Vijay Updates
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Low energy lumi scan plots (runs 8456-70 carbon scaler analysis)
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- generally things look promising, with ~5% variation
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- Scaler yield shows increasing trend for HMS and SHMS carbon
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- Will need to play around with beam current offset
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- HMS and SHMS look different which is slightly odd
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- For low current run, may just need to apply an offset
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- Error bars for track yield lumi scans are very large
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- Scaler yield - applying CPULT
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- Should not be applying CPULT
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- Only need to apply electronic LT correction
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- Determine from comparison between CPU/EDTM LTs
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- Should also be using ELCLEAN or ELREAL, not total triggers, which is too
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loose at high rate
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- ELREAL is probably best
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- will discuss further offline
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*******************************************************************************
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GH leaves to go catch the bus to the airport
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Rest of notes by SJDK
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*******************************************************************************
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Jacob Updates
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Optics
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- Met with Holly yesterday
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- Target length and optical matrix
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- Discussed using A1N/D2N matrix elements: shouldn't really affect us too
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much
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- Jacob will check and compare with what we have to confirm this though
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Scanning through kinematics for PionLT
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- Making a master standard.kinematics file
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- Updating angles/energy in same way as KaonLT
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Vijay Discussion - Scaler Tree
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- Scaler current plot
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- Clarification of scaler reads
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- Richard shows in his code how this is done - scaler.py
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- A little less intuitive in how these are counted and the sum is determined
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- Can't just integrate over the tree
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- Need to explicitly go through the tree one event at a time
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Stephen Updates
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---------------
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- Added in RF-time corrected for flight time according to particle mass
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- e/pi/K/p
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- In hcana, runs ok
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- Need to test and check it looks OK
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- Flat vs beta for each particle type (with PID cuts for particle)
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- Will try to make some plots and show in an upcoming meeting
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- Implementation differs slightly from Shuo, will discuss
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Next meeting:
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- Note the new meeting time after shift to USA standard time
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8:15 Eastern/7:15 Regina/5:15 Pacific (very sorry!)
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- new Zoom link too
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---------------------
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Garth Huber is inviting you to a scheduled Zoom meeting.
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Topic: PionLT/KaonLT Analysis Meeting
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Time: Nov 9, 2022 07:15 Saskatchewan
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Every week on Wed, until Dec 21, 2022, 7 occurrence(s)
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Nov 9, 2022 07:15
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Nov 16, 2022 07:15
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Nov 23, 2022 07:15
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Nov 30, 2022 07:15
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Dec 7, 2022 07:15
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Dec 14, 2022 07:15
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Dec 21, 2022 07:15
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Please download and import the following iCalendar (.ics) files to your calendar system.
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Weekly: https://uregina-ca.zoom.us/meeting/tJYoc-uupzwsGNfohZ9_pV3n0uuq0LF7JMge/ics?icsToken=98tyKuCqqz8oHN2SthuERowQGY-ga-7xmGZdjY1bkxffWh9DVFD4ZvdXI-JTNo_6
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Join Zoom Meeting
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https://uregina-ca.zoom.us/j/92542697623?pwd=MjcrZEcxbXkwRldiL1VYL1dCVkdVQT09
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Meeting ID: 925 4269 7623
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Passcode: 878842
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Dial by your location
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+1 312 626 6799 US (Chicago)
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+1 646 876 9923 US (New York)
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+1 646 931 3860 US
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+1 301 715 8592 US (Washington DC)
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+1 309 205 3325 US
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+1 669 900 6833 US (San Jose)
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+1 689 278 1000 US
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+1 719 359 4580 US
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+1 253 215 8782 US (Tacoma)
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+1 346 248 7799 US (Houston)
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+1 360 209 5623 US
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+1 386 347 5053 US
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+1 507 473 4847 US
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+1 564 217 2000 US
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+1 669 444 9171 US
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Meeting ID: 925 4269 7623
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Find your local number: https://uregina-ca.zoom.us/u/aB6tAjOMV
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---------------------
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