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["Zhang, Shenghui" <shenghui AT uic.edu>]

Hi Daniel, Flemming and Elke,

For Daniel and Flemming, there is an angle offset for the first module which is 15 in current geometry set up,  i.e. the center of the first module is at 15 with step by (2pi)/12 for the center of the next.

For Elke,  the Si sensors are not at the same position. Due to inner and outer are displaced relative to the center of the disk, there are 2 z locations for Si sensors. one is for inner.  Another is for outer. While there are another 2 z locations due to the adjacent module is alternate. So, there are 4 z locations for one disk relative to the center of the disk.

Thanks,

Shenghui

---

From: Star-fst-l <star-fst-l-bounces AT lists.bnl.gov> on behalf of videbaek <videbaek AT bnl.gov>
Sent: Monday, January 11, 2021 9:05 AM
To: Aschenauer Elke-Caroline <elke AT bnl.gov>
Cc: Star-fst L <star-fst-l AT lists.bnl.gov>
Subject: Re: [Star-fst-l] Weekly FST meeting, Jan 11 8:30am (BNL time)

 

Hi I will take at look at this later, I am not completely sure what you
mean by
i.e. is the center
>> of the first module at 0 with the center of the next at (2pi)/12?

Maybe we can chat later  after 11 .30 when I am done with some other
work.

Flemming


Elke, The Si sensors are not at the same position. Inner and outer are
displaced and alternate wedges are displaced relative to the center of
the disk.


On 2021-01-11 09:59, Aschenauer Elke-Caroline wrote:
> Daniel,
>
> maybe I misunderstand, but the 12 wedges in one disk, all sit at one
> z, the design I have seen does not allow anything else.
>
> cheers elke
>
>> On Jan 11, 2021, at 09:50, Daniel Brandenburg
>> <dbrandenburg.ufl AT gmail.com> wrote:
>>
>> 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://nam04.safelinks.protection.outlook.com/?url="https%3A%2F%2Fdrupal.star.bnl.gov%2FSTAR%2Fevent%2F2021%2F01%2F11%2Fstar-forward-silicon-tracker-meeting&amp;data=04%7C01%7Cshenghui%40uic.edu%7C99519e005aee467ed1a708d8b6425535%7Ce202cd477a564baa99e3e3b71a7c77dd%7C0%7C0%7C637459743382890832%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=jLq8bWnFKC5eLCTHZm1fmzYe5JvLwokLCm%2BZkWj%2BKio%3D&amp;reserved=0
>>>
>>> 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://nam04.safelinks.protection.outlook.com/?url="https%3A%2F%2Fdrupal.star.bnl.gov%2FSTAR%2Fevent%2F2021%2F01%2F11%2Fstar-forward-silicon-tracker-meeting%2Ffollow-action-items&amp;data=04%7C01%7Cshenghui%40uic.edu%7C99519e005aee467ed1a708d8b6425535%7Ce202cd477a564baa99e3e3b71a7c77dd%7C0%7C0%7C637459743382900789%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=wXwEd9fefVGfUe%2BvZ5Mwdv5WEPnyIhxkSlT6c9x1Pxc%3D&amp;reserved=0
>>>
>>> Zhenyu
>>>
>>> ********** ZOOM Meeting ********** **********
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--
Flemming Videbaek
senior scientist
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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