STAR Protected
TPC weekly
virtual , at 19:00 (GMT), duration : 00:00
- hardware status
- operations
- software
- cluster quantization
-update on test productions
TPC weekly
virtual , at 20:00 (GMT), duration : 00:00
No issue with TPC hardware
-Have adjusted methan content to make Vdrift more constatnt; there were several period in Feb with variations.
- powerdips and magnet trips during last weeks running.
The two runs in day 38 and 66 had outer sector 19 exhibit large excess of charge that extended for all pad and rows for about 150 timebins. See blog entries in https://drupal.star.bnl.gov/STAR/blog/videbaks/tpc-qa-2021 near top of page
Most likely a faulty GG driver board . Alexei suggested looking at signals from board during next maintanence day (unless it get really bad). Will talk to Tim on this.
Gene reported looking at laser un running 7.7 GeV for local clock vs. coll clock. Did not see any different between laser positions. Now looking at prompt hits for two conditions, (UPDATE: small shifts seen for the entire TPC by 14.1 ns, but not on the scale of 1 time bucket; documentation is here)
Yuri show plots
these are references for plots which we discussed today
1. Comparison RF and FF https://drupal.star.bnl.gov/STAR/system/files/TpcCSTransformations_0.pdf
-- the FF has only 34k events.Alignment same for two settings.
2. QA plots for RunXXI (express production) : https://www.star.bnl.gov/~fisyak/star/BES/
---
3. Lasers for different fields
-- no clear pattern. Sector 20 seems consistent for all fields. 20 has best lasers
4. Prompts for different VPD timing cuts
-- shows dependence on collisions timing (sum of VPD timing)
The last plots on meeting page only
TPC calibration reviews
virtual , at 14:30 (GMT), duration : 00:00
https://indico.bnl.gov/event/10740/
This page will be used for draft talks
| Time | Talk | Presenter |
|---|---|---|
| 09:00 | TPC Calibration Organization ( 00:20 ) 1 file | Gene Van Buren (BNL) |
| 09:30 | surveys ( 00:20 ) 1 file | F.Videbaek |
| 09:50 | Resources for HLT and Express Production ( 00:20 ) 1 file | Hongwei Ke |
| 11:00 | TPC Distortions ( 00:40 ) 1 file | Gene Van Buren (BNL) |
| 11:40 | FXT event-by-event correction ( 00:20 ) 1 file | Irakli |
| 12:00 | TPC calibration ( 01:10 ) 1 file | Yuri Fisyak |
TPC weekly
, at 20:00 (GMT), duration : 00:00
hardware
- the west laser had a LV power supply with a bad fuse. Alexie got an access fand fixed in < 1 hour
- Alexei monitor gas and will adjust methan concentration slightly.
- new hot channel in sector1. Have asked Tonko to mask out
FF request.
Gene summarized the FF request as it had emerged from the calibration review. It is important to run FF setting to seperate alignment, E*B distortins
but having data from both polarities. Yuri & Gene confirm that the 20M RF is a good sample from RFF and it was concluded we should request a change as soon as practical and on Wednesday access day at latest. Alexei brought up request to at at the time of switch that a high stat laser run ~20k is taken jest before magnet change and another one is taken with FF after the change, and magnet stabilized.
Yuri showed the dedx for his run 20 calibration for collider data and fixed target.There is some room for improvement in particular for the FXT target data.
Yuri showed that the readout of the magnets current fluctuate on a 15 sec time sacle between two distinct values. Current code only has one magnet value per run so it gives rise to distinct bands of say K0_as there is a scale factor between current read and Field suggest to use average value for future.
Gene discussed a Minor problem in sector alignment distortion correction as shown in attached slide on web page.
Looked at run 18 distortion maps and notice a missing featue that he expected namely spikes missing between inner and outer sector. This is due to an un intentional change of code in 2014. Demonstrated with differences that these effect are likely small. One measure of #primary tracks is sub-promille.
| Time | Talk | Presenter |
|---|---|---|
| 15:00 | Run XX dE/dx calibration ( 00:05 ) 0 files | Yuri Fisyak |
| 15:05 | Run XXI Ks0 mass and STAR main magnet current ( 00:05 ) 0 files | Yuri Fisyak |
| 15:10 | Minor problem in sector alignment distortion correction ( 00:20 ) 0 files | G. Van Buren (BNL) |
TPC weeklu
, at 20:00 (GMT), duration : 00:00
TPC weekly
, at 20:00 (GMT), duration : 00:00
agenda
- hardware status
- software updates
- calibration review
TPC weeklu
, at 20:00 (GMT), duration : 00:00
TPC weekly
, at 20:00 (GMT), duration : 00:00
- hardware status
- run progress
- software
- TPC Review Planning
Charge to committee
We just formed the STAR TPC calibration review committee. It is timely and critical to look at the offline calibration tasks and issues. The committee is charged to evaluate the readiness of the TPC calibration for the BES-II data production and provide answers to the following questions by the end of March 2021:
1. What is the status of the tracking and production calibration?
2. Where is the bottleneck of the TPC calibration procedure?
3. Are there enough collaboration manpower and resources for the tasks?
4. How are the online/operation/fast-offline/PWGs efforts coordinated to accomplish the goals?
5. Is there a clear document of procedures in calibration and what are the unexpected and expected issues in BES-II datasets? What are the steps in calibration, and how are the current responsibilities assigned?
6. What is the timeline and path toward completion of whole BES-II calibration for production?
7. Any lesson learned toward future runs?
The members are:
Zhangbu Xu (Chair)
Bill Christie
Carl Gagliardi
Frank Geurts
Marian Ivanov
Ivan Kisel
Tonko Ljubicic
Maria Stefaniak
Jim Thomas
Qinghua Xu
Xin Dong (ex officio)
Rongrong Ma (ex officio)
Talks and subject area.
Geometry & alignment (Yuri)
• Drift velocities
• dE/dx
• Specifics for Run 19
• Cosmic data
• Beam data
• Laser data
• What is the procedure for alignment; How is it documented
• Bottleneck in timely calibrations
• Validation procedures and QA
• Lessons and procedures learned from iTPC prototype commissioning
• Present/summarize clearly the open/unknown issues and potential concerns (all talks)
Surveys done (Flemming)
• Alexei, Jim and Yuri (operation survey)
• Other detectors as calibration tools (GMT, TOF, BEMC)
• How they are included in the calibration procedure
Correction Distortions (Gene)
• Dynamic distortions: SpaceCharge & GridLeak
• Static distortions
Resources for Online and express stream (Hongwei)
• Recap of resources
• Activities
• Relation to FastOffline
Calibration (Irakli)
• T0
• Long bunch timing, FXT and collider BES-II
• How is express and fast offline used in calibration
• Resource/tools/datasets use
QA,QC (BES-II) (Dan)
• Recap of resources
• How are working groups involved in this
• Feedback, requirements to calibrations
TPC weekly
, at 20:00 (GMT), duration : 00:00
-- hardware status
-- startup plans
electronics update (Tonko)
a brief update regarding both TPX (aka outer sectors)
and iTPC (inner sectors) electronics and gating grid.
1) We have the new (Tim's) gating grid connected.
I calibrated it and it looks OK to me. But we should be
a bit weary because we had problems before.
One outcome is that it is relatively noisier at the
opening time than the old GG so one should pay attention.
2) The pulser runs have been taken and the gains
have been established as well as the bad-channel
list. Pretty much the same as last year because
we had no time (COVID and all) to mess with swapping
FEEs to check the problem and see where the
noise comes from: FEE or padplane.
The gains have been loaded into the database.
3) We _did_ swap the broken FEEs and RDOs.
As luck would have it, a single FEE in the ITPC worked
all Fall/Winter but failed as we closed the poletip.
It is masked.
Let's take it from here and see how we stand during
Charge for calibration review
Dear All,
We just formed the STAR TPC calibration review committee. It is timely and critical to look at the offline calibration tasks and issues. The committee is charged to evaluate the readiness of the TPC calibration for the BES-II data production and provide answers to the following questions by the end of March 2021:
- What is the status of the tracking and production calibration?
- Where is the bottleneck of the TPC calibration procedure?
- Are there enough collaboration manpower and resources for the tasks?
- How are the online/operation/fast-offline/PWGs efforts coordinated to accomplish the goals?
- Is there a clear document of procedures in calibration and what are the unexpected and expected issues in BES-II datasets? What are the steps in calibration, and how are the current responsibilities assigned?
- What is the timeline and path toward completion of whole BES-II calibration for production?
- Any lesson learned toward future runs?
The members are:
Zhangbu Xu (Chair)
Bill Christie
Carl Gagliardi
Frank Geurts
Marian Ivanov
Ivan Kisel
Tonko Ljubicic
Maria Stefaniak
Jim Thomas
Qinghua Xu
Xin Dong (ex officio)
Rongrong Ma (ex officio)
| Time | Talk | Presenter |
|---|---|---|
| 15:00 | Residuals re-tested ( 00:20 ) 0 files | Irakli |
| 15:20 | Comparison express production TFG19e and calibration production P20ic_calib for 19GeV AuAu2019 data ( 00:20 ) 0 files |
TPC weekly
virtual , at 13:24 (GMT), duration : 00:00
-- hardware
-- run preparation
-- software
+ Gene: Residuals with the iTPC
TPC meeting Jan 20, 2021
Hardware:
Inspection walk tru done. Checked HV. Leak rate is good < 2l/min after rep of valve.
Prepare for low Ar flow Friday, high flow Sunday. Blue sheet Monday
Laser Need to replace 3 windows- ordered. East side very good West some rafters missing due to windows.
Run Prep:
DB for TPC should be initialized. Yuri
Discussed HLT running for cosmics. HLT will be commissioned during cosmics, files should be kept as they are useful.
Discussed the proposal for running FF. With the current schedule for beam injection Friday evening in Blue, and Gas flow starting Tuesday morning at best one can get about ~ 1 day worth maybe 10M. As it will also be the first day of running it will probably be used for commissioning (e.g GMT triggers) the sample can be less. The EPD and BBC installation will also take place Thursday/Friday when magnet has to be off. Yuri said it could be useful for checking but not enough for full calibration.
Gene presented his ongoing study of inner-outer matching looking at very low-luminosity run from 19.6 , and under different conditions. See blog https://drupal.star.bnl.gov/STAR/blog/genevb/residuals-itpc
The 2020 calibration gives large track residual at the lowest pads (1-6 or so), while the ‘old’ does not show this but slightly larger values. Irakli pull up some plot and see similar effects in some of his results (from maybe a year ago).
Yuri is working on alignment. No results yet.
TPC weekly
virtual , at 20:00 (GMT), duration : 00:00
- agenda
Hardware status
Readiness and startup for Run2021
Software update
MinutesTPC meeting January 13, 2021
Hardware status:
HV systems ok. GG drivers fixed/swapped modules and the noisy channels reported earlier is gone. Laser ok. Will work on gas systems, ongoing plan to have Ar flowing by next mid-week, getting blue sheet by Mon 25.
Methan gas flow starting with shifts on Tuesday 26 at 8 am.
Alexei mentioned Jeff had asked for some positions of laser – will forward e-mail to Yuri.
Gene has requested sets of run with GMT trigger that was created for run20, but where commissioning was not complete. A software (trigger code had a flaw, but is now fixed).
The MTD will be available for the startup phase, and for possible other physics runs like O+O should they happen.
Yuri brought up that it will be very useful to have about 3 days of FF cosmics. He was requested to come with a specific goal for tracks/triggers that we can forward to ops group.
Q: When did we last have FF cosmic data?
Gene reminded us that DB should be initialized for this run. Will ask Irakli if he had scripts from last year to do this and get hold of them.
Flemming mentioned that Star ops mgt and star mgt will like to have a review for TPC focused on calibrations and tracking. As Gene pointed out this has not been done in about a decade. It will be an internal STAR committee chaired by Zhangbu.
Yuri informed us that there was an error in his calculations (code, not formulae) and that the
Results presented last week on asymmetric corrections are wrong. They are symmetric in East/West, Thus the issues on the alignments and calibrations still stands as un-resolved.
Gene has started a study of looking at residuals in low-luminosity 19.6 Gev runs and see a split between inner and outer. Seems related to padrow40 correction i.e static distortion due to the gridleak wall. Gene will present results at a later stage of the study.
zoom info
TPC weekly
virtual , at 20:00 (GMT), duration : 00:00
-- hardware
-- software
| Time | Talk | Presenter |
|---|---|---|
| 15:00 | TPC Distortions (progress report) ( 00:20 ) 1 file | Yuri Fisyak |
| 15:20 | Alignment Update ( 00:20 ) 1 file | Irakli |
FST QC meeting
virtual , at 14:00 (GMT), duration : 00:00
Internal review of QC process and current status
Recommendation from review
An internal review of the procedures and implementation of the QC plans and documentation should be performed after the first 10% of the production is complete before further expensive and sparse parts (sensors and asics!) are committed.
The brief review should present
1) Demonstrate implementation of e-log
Take 2 cases
a) One of the prototype that was populated and tested (03,/04) Try to grade it with the current requirements as we know they were successfully populated and running
b) Take of the currently produced modules that were send to UIC (9-12) and show the grading
2) Present a summary of grading for the 09- now modules for each of the sub-grading quantities (outer, inner, different fastnesses, DR). Explain how the weighted grading is done.
3) Present what went wrong with the rejected ones (overflow glue,..) and what that implies for further production
Charge to review:
Is the QC documentation sufficient?
Does the QC documentation in the assembly document (V3) reflect what is done now?
Should the summary contain some of the sub grading?
Is there a need for any change in procedures, or QC measures?
.
tpc weekly
virtual , at 20:00 (GMT), duration : 00:00
-- hardware
-- software
Minutes
TPC weekly meeting
Hardware; Alexei excused. Is working on laser and gas system
The GG driver modules have been installed (Christian, as Tim is out) One module does not provide HV. There are two spare modules.
David is communicating with Tonko how best to provide the SC for the Gating Grid.
Software
Irakli had at LBNL meeting; provided an update to me after meeting
“I talked to Yuri last week about progress and the calculation of the distortions.
I also pointed out to him a little problem in the reading of the inner sector position parameters from the database. We reached out to Dimitry and he changed the readout for that table. It hopefully was not affecting anything, but now I have a good way to compare apples to apples as far as the inner sector position parameters are concerned.
While doing so I noticed that that is where a huge shift in z direction originates, so now I want to see if that is the right result or an artifact from what I've been saying – one can end up in a local minima for the alignment procedure. I will keep you guys updated I the days to come. I am running these jobs as fast as possible (Dmitry's fix has been applied only Monday).”
Yuri presented some intermedial results on his investigations of showing effect of his modified equations as discussed in the previous meeting 12/9/2020 that also have the documents
https://www.star.bnl.gov/~fisyak/star/Tpc/Distortions/
Unless there are updates we need to discuss in person this was the last TPC meeting for 2020. Please send updates to the mailing list until then 1/5/2021
zoom info
TPC weekly
zoom meeting, at 20:00 (GMT), duration : 00:00
Agenda:
-hardware status
- software
--- alignment progress
--- https://drupal.star.bnl.gov/STAR/system/files/he34embedding4th.pdf
--- AOB
TPC meeting minutes December 9, 2020
Hardware:
Alexei is done with laser maintenance on West side; waiting for etof re-install to be complete on East (done)).
Bob and Tonko finishing the work on Westside, which will close first. One more slicing to be done Wed. Still 5 splicing to be done on East side
Irakli have reported to Yuri he is revisiting the alignment (inner-outer) from the cosmics.
Yue-Hang gave update on 3He eff . Guannan had looked at effect on RMS ped in Sl10k in embedding and see no effect. In never libraries the RMSX cut look ok excepts for eta~0 .
At eta ~0 there may be other issues- as seen for other particles. Yuri points out there may be influence of prompt there |z| > 135, though issues are seen at up to ~20cm (??) from readout chambers.
Yuri reported on work on space charge correction and reports there could be a difference between East and West corrections. It is work in progress. Initial report is posted on meeting page, as well as some note by Jim Thomas from ALICE work on this subject.
| Time | Talk | Presenter |
|---|---|---|
| 15:20 | TPC Distortions (progress report) ( 00:20 ) 2 files | Yuri Fisyak |
Cold QCD/ Spin PWG Meeting
https://drupal.star.bnl.gov/STAR/pwg/spin/weekly-pwg-meetings, at 00:00 (GMT), duration : 00:00
Cold QCD/ Spin PWG Meeting
https://drupal.star.bnl.gov/STAR/pwg/spin/weekly-pwg-meetings, at 00:00 (GMT), duration : 00:00
Cold QCD/ Spin PWG Meeting
https://drupal.star.bnl.gov/STAR/pwg/spin/weekly-pwg-meetings, at 00:00 (GMT), duration : 00:00
Cold QCD/ Spin PWG Meeting
https://drupal.star.bnl.gov/STAR/pwg/spin/weekly-pwg-meetings, at 00:00 (GMT), duration : 00:00