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["Ye, Zhenyu" <yezhenyu AT uic.edu>]

There are some plots we can consider adding 
https://drupal.star.bnl.gov/STAR/system/files/yezhenyu_FST_20211228.pdf

Please note that the plots (page 3, right column) are obtained from the 
following procedure

1. Separate R into 2 regions (inner and outer), and phi into 128 regions 
(each with 12 strips)
2. Require a hit on disk 1 and a hit in the same R-phi region on disk 3 (the 
number goes to the denominator)
3. Look for a hit on disk 2 in the above R-phi region (numerator)
4. Divide 3 by 2

This study was to check the relative efficiency of FST during HV scan, not 
the absolute efficiency. The latter is expected to be above 95% based on 
prototype cosmic testing results using IST. The difference between the 
expected vs what we see can be explained by 
1. Finite phi bin width (I think the effect is ~1/12)
2. Ideal positions assumed 
To get the true absolute efficiency, we will need proper alignment and 
tracking including sTGC and PV.

Zhenyu

> On Jan 28, 2022, at 9:27 AM, Yi Yang <yiyang AT ncku.edu.tw> wrote:
> 
> Dear Xu,
> 
> Thanks a lot for the slides. They look good, but I would think that it will 
> be good to have some performance plot, like efficiency? 
> 
> Cheers,
> Yi
> 
> +++++++++++++++++++++++++++++++++++++++++++++++++++
> Yi Yang, Associate Professor 
> Department of Physics 
> National Cheng Kung University 
> Tainan, 701 Taiwan 
> E-Mail: yiyang AT ncku.edu.tw 
> Tel: +886-6-2757575 ext.65237 
> Fax: +886-6-2747995
> Group Web: 
> https://urldefense.com/v3/__http://phys.ncku.edu.tw/*yiyang__;fg!!P4SdNyxKAPE!QkRy9WfPRCJOuabO8VdW4_fLgDReA_zWDUXmPq6Y5lvzH1f4Xem5wVTb2mppdq03kQlhWHo$
>   
> +++++++++++++++++++++++++++++++++++++++++++++++++++
> 
> 
> On Fri, Jan 28, 2022 at 10:56 PM Xu Sun <sunxuhit AT gmail.com> wrote:
> Hi All,
> 
> As requested by Elke, I have prepared two slides for FST.
> Please find it attached.
> 
> Comments and suggestions are welcome.
> 
> Best,
> 
> Xu
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