sPHENIX MAPS tracker discussion

[Ming Liu <ming AT bnl.gov>]

Hi Jo,

Thanks for the slides. We definitely need to follow up with ITS progress on 
this matter. 

1) It is interesting to see that ITS/IB L0-2 have much lower fraction of 
large clusters (0.2%) than that of L4-6 (3%), I understand the readout modes 
are different for IB and MB/OB. 
2) I assume they used the long data format with clustering enabled, is that 
right?
s
3) I looked at our test beam data from 2019, 
https://www.phenix.bnl.gov/WWW/publish/mxliu/sPHENIX/GenMeetings/2019/MVTX-Test-Beam-Reprot-052019.pdf
Slides #16-18, and didn't see such anomaly shown in ITS reports (P3,  and the 
P2 in the detailed slides )
 
4) we also took some beam data with a range of ALPIDE threthold values, test 
beam run informaiotn can be found on the sPHENIX wiki, 
https://wiki.bnl.gov/sPHENIX/index.php/LongRunList

I am not sure what data format was used for the MVTX test beam, likley "short 
data format", but we can check the configuration files.

Cheers,
Ming 

-----

 
Dr. Ming Xiong Liu
P-3, MS H846
Physics Division
 
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On 1/18/22, 6:13 AM, "sPHENIX-MAPS-l on behalf of Schambach, Jo via 
sPHENIX-MAPS-l" <sphenix-maps-l-bounces AT lists.bnl.gov on behalf of 
sphenix-maps-l AT lists.bnl.gov> wrote:

    At yesterday's ITS Technical Coordination meeting  there was an 
interesting presentation on a first look of ITS cluster sizes from the pilot 
beam last year that I wanted to share here. One of the interesting aspects in 
this presentation was the fact that there are quite a few very large clusters 
that are not yet understood. Also it seemed to me that the average cluster 
size was larger than what we had assumed in the past for our studies for the 
readout rates in ITS (and thus probably also in MVTX?).
    Cheers,
    Jo


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