sPHENIX MAPS tracker discussion

[Martin Purschke <purschke AT bnl.gov>]

Hi Jakub

interesting slides.

Some comments  -

Slide 4:

sPHENIX is definitely higher than 3m...

RHIC has an ~60MHz clock, 56.299 to be exact, and 1/6 of that is the 
bunch crossing rate. (and yes for the MVTX we provide a 40MHz clock so 
it feels like at the LHC)

I would leave out the "due to calorimeter limit", 15KHz was the design

The "MVTX and INTT" with the sub-point "Tracking Detectors capable of 
streamed readout" makes it sound like only those 2 can do it. Not true.
BTW, I always see it called streaming readout - small point.


The annotations you added that label the groups with oHCal/iHCal etc on 
Slide 9 make it look like overall there are just 6 such PCs. You have to 
get across that this is only a schematic overview.

Again, I know you are using MVTX and INTT, but the TPC is also SRO-capable.

Slide 10 - the thing with the local mode is kinda irrelevant in this 
context.

Not sure what to make of the sentence about the busy - it's misleading. 
The GL1 maintains a global busy that the GTMs feed into.

You mangled and re-drew the right lower diagram from my slides but made 
it wrong. There are 4 LL1 fibers coming in, you draw 6 and say "56". 
(And it's 4 Lemos, not 8.) I find what I have in several of my 
presentations (I showed you the shift training slides) that explains 
what constitutes a "Granule" better and clearer.

Slide 11 -

"stretch the latency down" seems like an odd choice of words.

point 2) JH can correct me, I believe we have 158m trunks + whatever the 
patches add, and they are fibers, not cables.

On Sl 14, with "extract the Wupper module", do you mean remove? How will 
you configure the unit then w/o PCIe access? (Just curious).

Ok, have fun in Italy!

        Martin


On 9/25/23 19:10, Jakub Kvapil wrote:
> Dear all,
>
> some of you get know during the QM that we have a small R&D project for 
> developing FPGA based ML triggering system which demonstrator we plan to > deploy for the pp run at sPHENIX.
> When I was preparing slides, it become obvious that without introducing 
> the sPHENIX DAQ and triggering system in more detailed manner, the 
> overall talk will not make much sense.
> Thus, we have decided to circulate the slides also within sPHENIX.
>
> Any comments and questions are highly appreciated. I will update the 
> coloring to be more uniform later.
> They are for the TWEPP conference - Topical Workshop on electronics for 
> particle physics (https://indico.cern.ch/event/1255624/ 
> <https://indico.cern.ch/event/1255624/>), thus heavily specialized. The 
> time is 16+4.
> Please provide any comments by this Wednesday, as I am flying on Friday 
> (sorry for later notice)
>
> Thanks a lot
> Best regards
> Jakub


--
Martin L. Purschke, Ph.D.        ;   purschke AT bnl.gov
                                 ;   http://www.phenix.bnl.gov/~purschke
                                 ;
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