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TPC weekly

2021-06-02 15:00
America/New York
Wednesday, 2 June 2021
virtual , at 19:00 (GMT), duration : 00:00

TPC weekly

2021-04-14 15:00
America/New York
Wednesday, 14 April 2021
virtual , at 19:00 (GMT), duration : 00:00
Agenda
- hardware update
- operations
- calibration updates


       Apr 14, 2021 03:00 PM
        Apr 21, 2021 03:00 PM
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TPC weekly

2021-04-21 15:00
America/New York
Wednesday, 21 April 2021
virtual , at 19:00 (GMT), duration : 00:00

TPC meeting April21 minutes

 

Present:

Alexei,Babu, Flemming,Gene,Hongwei,Yuri

 

TPC running well. The pizo driver for the laser failed , no power,was adjusted during quick ccess, and then rebooted today during access. Lost about one laser run during. Will investigate how remote reboot can be done. Such failure has happened 1-2 per run.

 

Flemming present a few more observation on the single bad pad hot due to values this seem to have pedestal subtracted incorrectly. This is intermittent and usually, but not always clears on next run. Also it only 5-10% of events with this failure. See  https://drupal.star.bnl.gov/STAR/blog/videbaks/tpc-qa-2021
for more details

 

The 19.6 GeV calibration sample is complete. Includes dynamic space charge, and event by event t0 correction. EPD had time offsets calibrated/changed at some point in time during the 19.6 GeV data sets. This change is now in DB.  The 14.5 GeV  should be done by the weekend. Babu will start looking at the run 20 soon.

 

The sample(s) can now be checked for BTOF calibrations, and dE/dx.

If the mass square difference seen in east persists with the DbTpcMaker that was updated, there will be additional work to identify this issue. The TOF group will not sign off with a mass split of approx. 1%.

 

 

TPC weekly

2021-04-28 15:00
America/New York
Wednesday, 28 April 2021
virtual , at 19:00 (GMT), duration : 00:00
agenda
- hardware status
- operations
- calibration status

Flemming Videbaek is inviting you to a scheduled ZoomGov meeting.
 
Topic: TPC weekly
Time: Apr 28, 2021 03:00 PM Eastern Time (US and Canada)
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TimeTalkPresenter
15:00Averaged STAR magnet current table ( 00:10 ) 0 files
15:00Averaged STAR magnet current table ( 00:10 ) 0 files
15:102nd round with Run XIX calibration production for 19GeV and 14p5GeV samples ( 00:20 ) 0 filesYuri Fisyak

TPC weekly

2021-05-05 15:00
America/New York
Wednesday, 5 May 2021
virtual , at 19:00 (GMT), duration : 00:00

TPC minutes April 5, 2021

Present: Alexei, Hongwei, Gene, Turi and Flemming

 

Hardware:

-       TPC running well.

-       Used access to put pizo driver on remote PS

-       Adjusted methane content.

 

Operation:

Sector 20 RDO 3 had to be masked out. Unfortunately, the crew did not reboot iTPC on run control, so there are ‘fake’ cluster in the data. The manual for masking out has been updated to remind people to get this done. 

There is currently no code to perform masking in the offline code. i.e. skipping hits in masked sectors.

 

Calibrations:

 

Gene summarized impressions from S&C calibration discussion. There are small deviations in M**2 plot with newest calibration. The deviation seen corresponds to order 0.2% in momentum. Indicates imperfect calibrations in TPC and/or BTOF. What are requirements to physics analysis to be performed? PWG should define?

 

It is important to have clarifications if current alignment and calibrations is sufficient to do physics for at least some physics analysis, since redoing / improving alignment will take several months

 

Yuri iterated the deviation is ~40% (at what momentum?) of mass**2 width. Have requested plots from BTOF group to get additional finer divided information. Is not convinced its TPC; Needs additional info to separate. Example: plotting tray numbers rather than phi.

 

Babu has done first pass on run-20 9.2 GeV dynamic distortions. Run 19 is done.

 

Yuri is revisiting dE/dx for both 19 and 14.5 GeV. Not satisfied with aging effect treatment.

If I recall, there was an early fast drop after installation of iTPC reported by Yuri long time ago.

TPC weekly

2021-05-12 15:00
America/New York
Wednesday, 12 May 2021
virtual , at 19:00 (GMT), duration : 00:00

TPC meeting May 12, 2021

 

Present: Alexei, Gene, Yuri, Hongwei and Flemming

 

Hardware:

Basically in good shape. Struggled with HV GUI’s likely due to ITD scanning during the access day. Sector 20 outer was repaired by Tonko and Mike, bad RORC card.

Has observed the part short of west filed cage.

 

Alexei has the calibrated NMR in house.

 

Operations:

The O+O running  very clean. The 1.5mrad crossing angle and levelling at ~3-4kHz Mbias results in very little if any dynamic space charge.

This  bodes well for the FF setting to be run in about a week.

For the central collisions to be run right after the RFF 400 M Mbias the Mbias rate will be possibly ~20kHz.

 

Calibrations:

 

Gene looked at h+/hi ratios vs. pt for the 19.6 Gev au+au and reports seeing sector to sector variations;

https://drupal.star.bnl.gov/STAR/blog/genevb/h-h-run-19-196-gev

These variations are at similar level as after run 12 alignment calibrations i.e little overall effect but sector to sector variations.

The sectors showing largest effect correlates with Zaochen's findings in mass2 splitting in BTOF

Thus the variation is most likely due to TPC calibrations.

Yuri commented that until we have the FF data  its unlikely that underlying reason, and improved calibration can be made. It is also likely to be a large effort, not a few weeks.

 

Yuri reported that dE/dx calibration for 14.5 and 19.6 is completed

It was also reported to S&C management

https://drupal.star.bnl.gov/STAR/system/files/19%20and%2014p5%20GeV%20dEdx%20Calibration.pdf

TPC weekly

2021-05-19 15:00
America/New York
Wednesday, 19 May 2021
virtual , at 19:00 (GMT), duration : 00:00

TPC weekly

2021-05-26 15:00
America/New York
Wednesday, 26 May 2021
virtual , at 19:00 (GMT), duration : 00:00

TPC weekly

2021-03-24 15:00
America/New York
Wednesday, 24 March 2021
virtual , at 19:00 (GMT), duration : 00:00
agenda
- hardware status
- operations
- software
 - big events
 - update on test productions

Minutes:
hardware: There was a failure of LV for TPX. broken fan; replaced with spare available in IR.
Have ordered 3 more fans, special. 3 mo. delivery

After a massive trip, one HV section 20-4 itpc seem not to have been brought up and not noticed. Asked David
to check the readouts during this event.

We see very large events in run 19 reconstruction, and in current data taking
a) current activity is related to the beat-squeeze; discussed also at ops meeting. Under discussion what to happen
b) run-19 reco is related to some store with BMM running throughout some runs.

Discussion on TPC calibration. Good progress is being made. Additional discussions later this day.

       
        Mar 24, 2021 03:00 PM
        Mar 31, 2021 03:00 PM
        Apr 7, 2021 03:00 PM
        Apr 14, 2021 03:00 PM
        Apr 21, 2021 03:00 PM
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TPC weekly

2021-03-31 15:00
America/New York
Wednesday, 31 March 2021
virtual , at 19:00 (GMT), duration : 00:00
Agenda

-hardware
-operation
- test production progress
- AOB


      Mar 31, 2021 03:00 PM
        Apr 7, 2021 03:00 PM
        Apr 14, 2021 03:00 PM
        Apr 21, 2021 03:00 PM
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TimeTalkPresenter
14:00new schema for Inner Sector alignment ( 00:20 ) 1 fileHongwei Ke

TPC weekly

2021-04-07 15:00
America/New York
Wednesday, 7 April 2021
virtual , at 19:00 (GMT), duration : 00:00

TPC weekly

2021-03-17 15:00
America/New York
Wednesday, 17 March 2021
virtual , at 19:00 (GMT), duration : 00:00
agenda
- hardware status
- operations
- software
  - cluster quantization
  -update on test productions



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TPC weekly

2021-03-10 15:00
America/New York
Wednesday, 10 March 2021
virtual , at 20:00 (GMT), duration : 00:00
Minutes

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








Flemming Videbaek is inviting you to a scheduled ZoomGov meeting.
 
Topic: My Meeting
Time: Mar 10, 2021 03:00 PM Eastern Time (US and Canada)
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        Mar 17, 2021 03:00 PM
        Mar 24, 2021 03:00 PM
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TPC calibration reviews

2021-02-16 09:30
America/New York
Tuesday, 16 February 2021
virtual , at 14:30 (GMT), duration : 00:00
 The talk will be posted on BNL indico
https://indico.bnl.gov/event/10740/

T
his page will be used for draft talks
TimeTalkPresenter
09:00TPC Calibration Organization ( 00:20 ) 1 fileGene Van Buren (BNL)
09:30surveys ( 00:20 ) 1 fileF.Videbaek
09:50Resources for HLT and Express Production ( 00:20 ) 1 fileHongwei Ke
11:00TPC Distortions ( 00:40 ) 1 fileGene Van Buren (BNL)
11:40FXT event-by-event correction ( 00:20 ) 1 fileIrakli
12:00TPC calibration ( 01:10 ) 1 fileYuri Fisyak

2021

STAR SOFTWARE NEWS APR 9, 2021
---------------------
The present release assignment:  
             SL09g_embed (SL09g_2Embed_v10)  ROOT_LEVEL 5.22.00
             SL10c_embed (SL10c_embed_   

TPC weekly

2021-02-24 15:00
America/New York
Wednesday, 24 February 2021
, at 20:00 (GMT), duration : 00:00
 minutes:

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.



TimeTalkPresenter
15:00Run XX dE/dx calibration ( 00:05 ) 0 filesYuri Fisyak
15:05Run XXI Ks0 mass and STAR main magnet current ( 00:05 ) 0 filesYuri Fisyak
15:10Minor problem in sector alignment distortion correction ( 00:20 ) 0 filesG. Van Buren (BNL)

TPC weeklu

2021-03-03 15:00
America/New York
Wednesday, 3 March 2021
, at 20:00 (GMT), duration : 00:00

TPC weekly

2021-02-10 15:00
America/New York
Wednesday, 10 February 2021
, at 20:00 (GMT), duration : 00:00


agenda
- hardware status
- software updates
- calibration review

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TPC weeklu

2021-02-17 15:00
America/New York
Wednesday, 17 February 2021
, at 20:00 (GMT), duration : 00:00

TPC weekly

2021-02-03 15:00
America/New York
Wednesday, 3 February 2021
, at 20:00 (GMT), duration : 00:00
aAgenda
- 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


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