Star-tpc-l mailing list

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

Following up here because this reminded me about the gating grid transparency 
test runs....

I need ~400x as many events from pp200 to get a similar metric as in AuAu200. 
This is due to a few factors:

- fewer tracks per triggered collision
- reduced vertex position accuracy for signed DCA calculations
- increased pile-up contamination/backgrounds to weed out

That might sound detrimental to taking the runs I requested, but really, in 
AuAu200, I only needed a few seconds worth of running to get enough 
statistics. In pp200, I should be good with ~5 minute runs at low 
luminosities and ~10 minute runs at high luminosities (more pile-up).

Also, these test runs should be fine for using for physics, so the primary 
drawback to normal running is that I want to reduce the rates during some of 
these runs, and of course the overheads of stopping and starting runs.

Thanks,
-Gene

> On Mar 27, 2024, at 9:54 AM, Fisyak, Yuri V via Star-tpc-l 
> <Star-tpc-l AT lists.bnl.gov> wrote:
> 
> Hi Flemming, I do like idea to have both FF and RF cosmics runs before 
> collider will be started. Just keep in mind that the drift velocity will be 
> stabilized in 2-3 days after start of adding methane.
>  
> 
>                                                               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 <star-tpc-l-bounces AT lists.bnl.gov> on behalf of videbaek 
> via Star-tpc-l <star-tpc-l AT lists.bnl.gov>
> Date: Wednesday, March 27, 2024 at 9:41 AM
> To: Star-tpc L <Star-tpc-l AT lists.bnl.gov>
> Subject: [Star-tpc-l] slides for retreat
> 
> Hi Attached are the combined slides from Tonko and me for tomorrow
> Let me know if you  have more material to show, or any corrections.
> 
> best Flemming
> 
> PS Plan to upload them late afternoon.
> 
> -- 
> Flemming Videbaek
> senior scientist, emeritus
> videbaek @ bnl.gov
> Brookhaven National Lab
> Physics Department
> Bldg 510D
> Upton, NY 11973
> 
> phone: 631-344-4106
> cell     :  631-681-1596
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