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[Daniel Brandenburg <dbrandenburg.ufl AT gmail.com>]

Hi All,

I could not join this morning due to another meeting. I have been working on updating the tracking code to use the correct module-by-module z location instead of using a single z location for each disk. I expect that this is an important aspect in resolving the performance regression issue.  However, I am having a hard time getting the algorithm for the z location correct.

My algorithm splits each disk into 12 equal angle wedges. Even wedges are assigned one z location and odd wedges are assigned a different location (and also separated for inner and outer) My question is:

Is there an angle offset for the first module -> i.e. is the center of the first module at 0 with the center of the next at (2pi)/12?

I am having an issue where some hits from GEANT within one of these (2pi)/12 wedges appear to be in the next z-position, so I thought I may be off by a fixed angle. I have also histogrammed the positions but I'd like some confirmation that my understanding is correct.

Thanks,

Daniel

On Sun, Jan 10, 2021 at 11:12 AM Ye, Zhenyu <yezhenyu AT uic.edu> wrote:

Dear all,

We will have the first weekly FST meeting in 2021 tomorrow starting at 8:30am EST (BNL local time).

https://drupal.star.bnl.gov/STAR/event/2021/01/11/star-forward-silicon-tracker-meeting

0. follow-ups on review and action items *
1. Integration                                                                by Rahul Sharma, Felix Archampong
2. Hybrid and T-board                                                 by Maowu Nie, Mike Capotosto
3. Mechanical Structure                                                by Yi Yang
4. Production module assembly                                    by Xu Sun

* https://drupal.star.bnl.gov/STAR/event/2021/01/11/star-forward-silicon-tracker-meeting/follow-action-items

Zhenyu

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