Star-tpc-l mailing list

["Van Buren, Gene" <gene AT bnl.gov>]

Hi, Yuri

Is it better to introduce a new row-by-row "occupancy" or "deconvolution 
fraction" dependence into the dE/dx calculation than a trigger dependence?

Thanks,
-Gene

> On Nov 21, 2025, at 10:44 AM, Fisyak, Yuri V <fisyak AT bnl.gov> wrote:
> 
> Hello,  it looks like that I found the reason for dE/dx degradation in mtd 
> stream.
> See  
> https://drupal.star.bnl.gov/STAR/system/files/Run%20XXII%20dEdx%20comparison%20st_physics%20and%20st_mtd%20%20stream_0.pdf
> The conclusion is that we need trigger dependent dE/dx correction.
> 
> 
>                                             Yuri Fisyak
> 
> STAR                             Phone: +1 631 344 3913
> Brookhaven National Laboratory  Fax:    +1 631 344 4206
> 510A/1-161
> http://www.star.bnl.gov/~fisyak       E-mail: fisyak AT bnl.gov
> From: star-tpc-l-request AT lists.bnl.gov <star-tpc-l-request AT lists.bnl.gov> 
> on behalf of Richard Witt <Star-tpc-l AT lists.bnl.gov>
> Date: Thursday, November 20, 2025 at 12:29 PM
> To: Star-tpc L <Star-tpc-l AT lists.bnl.gov>
> Subject: [[Star-tpc-l] ] TPC Meeting Minutes
> 
> This Message Is From an External Sender
> This message came from outside your organization.
>   
> Present: Alexei, Flemming, Jim, Yuri, Gene, Rongrong, and myself
> 
> 
> == Hardware
> — all is going well for the most part
> — was small hiccup with laser (prior repair work appears to be holding)
> — current concentration seems to provide as stable 5.52 cm/us drift velocity
> — cathode interlock is now behaving
> 
> 
> == Electronics
> — still the usual losses and repairs of RDOs and FEEs (usual 15% dead on 
> average)
> — lost 5 or 6 RDOs in last five days, most were fixed yesterday
> — Gene reminded us that due to SL farm outage coming on Monday and Tuesday 
> there will be a delay in fast offline processing
> 
> 
> == Software
> — hit error work for AuAu23 DAQ 5000 (2023) with different fields (RF, RHF, 
> and ZF)
> — see https://drupal.star.bnl.gov/STAR/event/2025/11/20/Weekly-TPC-Meeting
> — Run23 dE/dx in physics and MTD streams
> — see https://drupal.star.bnl.gov/STAR/event/2025/11/20/Weekly-TPC-Meeting
> — MTD stream data presents ~1% difference in dE/dx MIP position
> — seems to be attributable to the inner sectors, but not yet fully 
> understood
> — Rongrong suggest looking at shift vs. RefMult due to central bias of MTD 
> trigger
> 
> 
> == AOB
> — Nothing new for this week.
> 
> 
> Best Regards,
>   Richard
> 
> Sent from my iPad
> -- 
> "Education is the most powerful weapon which you can use to change
> the world."
> 
> --Nelson Mandela
> 
> ~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~
>  Richard Witt, Professor of Physics     Phone (USNA): 410-293-6675
>     United States Naval Academy         Email: witt AT usna.edu
> ~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~~~***~