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[videbaek <videbaek AT bnl.gov>]

Thanks Christian , Tonko and Gene.

It is good we dod not have to open up. The study Gene , though, is good 
to have for future references
if issues in the future. e.g. connection issues, power supply. If you 
can put in in your blogs it will be great.

best Flemming


On 2023-03-14 05:07, Tonko Ljubicic via Star-tpc-l wrote:
> Hello,
>
> Christian found and fixed the problem. It was on the DAQ PC side.
>
>            -- Tonko
>
> On Tue, Mar 14, 2023 at 6:23 AM Van Buren, Gene via Star-tpc-l
> <star-tpc-l AT lists.bnl.gov> wrote:
> > Rough efficiency plots resulting from the loss of those two RDOs are 
> > attached as phi vs. eta for global tracks from ~1500 Run 19 AuAu200 
> > events. First for all global tracks, and then with a 25 hit 
> > requirement.
> >
> > For all globals, we can see that there isn't much impact for eta < 1 
> > (the loss of hits doesn't keep the tracks from being found), but 
> > there's up to ~50% loss for tracks going through that sector at high 
> > eta where the tracks are shorter to begin with.
> >
> > For the 25+ hit globals, we can see that the losses extend over a much 
> > larger range of eta because tracks drop below the cut on number of 
> > hits, with a larger efficiency drop than I expected. I'll investigate 
> > a little more and make a blog post.
> >
> > -Gene
> >
> > On Mar 13, 2023, at 4:38 PM, Van Buren, Gene via Star-tpc-l 
> > <star-tpc-l AT lists.bnl.gov> wrote:
> >
> > Hi, Flemming and all....
> >
> > On Mar 13, 2023, at 4:29 PM, videbaek via Star-tpc-l 
> > <Star-tpc-l AT lists.bnl.gov> wrote:
> > iii) Gene, what is an estimated loss of efficiency for tracks in 
> > sector 8 with these two RDOs out? We ned some estimate on the loss of 
> > physics f this is not resolved.
> >
> >
> > ....I seem to remember a similar study being done before, but I don't 
> > remember where it is nor whether it was pre- iTPC. What I can do 
> > relatively quickly is take some Run 19 AuAu200 data and process a few 
> > hundred events with and without those two RDOs and look at the 
> > distributions of lost tracks. Yuri may actually be more efficiently 
> > set up for a such a study than me, but I understand he's got plenty 
> > else on his plate.
> >
> > Carrying those inefficiencies through to impact on loss of physics 
> > would likely require PWG/analyzer involvement.
> >
> > -Gene
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--
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