STAR QA Board

["Ray, Robert L" <ray@physics.utexas.edu>]

Hi ShinIchi:

Yes, when the step is about as large as the rest of

the distribution it means that tracks from pileup events

are dominant.  This is what we have seen in previous 

years with proton-proton beams.

The shift reports are saying the drift speed is about

5.5 cm/micro-sec, so the drift time is about 36 mu-sec.

Thanks for asking,

Lanny

---

From: STAR-QAboard-l <star-qaboard-l-bounces@lists.bnl.gov> on behalf of EsumiShinIchi via STAR-QAboard-l <star-qaboard-l@lists.bnl.gov>
Sent: Friday, May 10, 2024 12:01 PM
To: star-qaboard-l <star-qaboard-l@lists.bnl.gov>
Subject: Re: [STAR-QAboard] Weekly QA Board Meeting - 10/May/2024 at noon 12 EDT

 

Dear Gene

Thanks for the explanation of the big step at the middle of z distribution of tpc hit. 

The reason why I asked was the step is just about factor of two compared to the 

outer z region, which sounded like they are all actual good hits, but just plotted 

overlapped at the middle caused by the long drift time converted to the z position. 

But you say they are mostly caused by pile-up, does this mean the most of the 

recorded hits are pile-up hits compared to the real hits from the triggered collision, 

even in this low luminosity of ~40kHz leveled rate? Could you please remind me 

the full drift timeof 2m (close to 50 us)? A few pile up (within this time window) in 

each event might be real collisions though… Thanks again. 

Best regards, ShinIchi 

On May 11, 2024, at 0:59, Ray, Robert L via STAR-QAboard-l <star-qaboard-l@lists.bnl.gov> wrote:

Dear QA team,

Sorry for today's confusion about the QA meeting. I did not

communicate with Ashik about what fast-offline intended

to present.

Richard's presentation from last week and today may be

found at my QA blog:

https://drupal.star.bnl.gov/STAR/system/files/QA_Status_Update_RWitt_May_3rd_2024.pdf
https://drupal.star.bnl.gov/STAR/system/files/QA_Status_Update_RWitt_May_10th_2024.pdf

Lanny

---

From: STAR-QAboard-l <star-qaboard-l-bounces@lists.bnl.gov> on behalf of ASHIK IKBAL via STAR-QAboard-l <star-qaboard-l@lists.bnl.gov>
Sent: Thursday, May 9, 2024 4:19 PM
To: star-qaboard-l <star-qaboard-l@lists.bnl.gov>
Subject: [STAR-QAboard] Weekly QA Board Meeting - 10/May/2024 at noon 12 EDT

 

Dear All,

We will have our weekly QA board meeting this Friday
(10/May/2024) at noon 12 EDT.  Please let me know if you would like to present. 

The agenda can be found here: https://drupal.star.bnl.gov/STAR/blog/ashik/QA-Board

Zoom connection details:

Join ZoomGov Meeting

https://bnl.zoomgov.com/j/1618907709?pwd=YitQYzFUdWFYU1ppTjYxTjRYbDdsZz09

Meeting ID: 161 890 7709
Passcode: 775538

Thanks,

Ashik

-- 

Ashik Ikbal

Research Scientist

Kent State University

(stationed at Brookhaven National Laboratory)

Department Of Physics

Kent, OH 44242, USA

Contact no.s: +1 631-504-7647 (USA)

                      +91 8250216234 (India)

Alternate e-mails: asheikh2@kent.edu

                             ashik@rcf.rhic.bnl.gov

                             ashik.ikbal.sheikh@cern.ch

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