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[Te-Chuan Huang <tchuang.phys AT gmail.com>]

Hi Yi,

Thanks for the question. Please find my reply in lines.

>  - p.8: Do we know the reason for the shifting mean of the resolution? 20 - 
> 30% shifting is quite a lot. 
We saw these before also for the global tracks and I think this is due to the 
track finder.
To me, It seems that without the constraints from vertex, the track finder 
prefer to reconstruct as lower pT (my resolution is defined as (truth - 
reco.)/truth).
But I’m not sure what exactly cause this.

>   - p.15: it surprises me that the 0 FST configuration has better charge 
> mis-identification rate than that of 1 disk. Do you know the reason? 
I’m also surprised by this. I will look into this.

>  - p.16: the fake hits rate is not only for FST (also considered the fake 
> hits in sTGC), right? Can we decouple the results from these two 
> sub-detectors?
Sure, I can do this.

> - p.18: the pT resolutions for 1 FST and 3 FST are almost the same which I 
> don't quite understand. 
As Zhenyu answered and from the nHitsFit cut study, having more silicon 
layers doesn’t mean more hits in track. So, the resolution may be similar.

Cheers,
Te-Chuan




> On Feb 21, 2019, at 7:27 PM, Yi Yang <yiyang AT ncku.edu.tw> wrote:
> 
> Hi Te-Chuan,
> 
> Thanks for the slides, very good.
> I have some questions on your study: 
>  
>   - p.8: Do we know the reason for the shifting mean of the resolution? 20 
> - 30% shifting is quite a lot. 
>   - p.15: it surprises me that the 0 FST configuration has better charge 
> mis-identification rate than that of 1 disk. Do you know the reason? 
>   - p.16: the fake hits rate is not only for FST (also considered the fake 
> hits in sTGC), right? Can we decouple the results from these two 
> sub-detectors?

>   - p.18: the pT resolutions for 1 FST and 3 FST are almost the same which 
> I don't quite understand. 

> 
> Cheers,
> Yi
> 
> +++++++++++++++++++++++++++++++++++++++++++++++++++
> Yi Yang, Assistant 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: http://phys.ncku.edu.tw/~yiyang 
> +++++++++++++++++++++++++++++++++++++++++++++++++++
> 
> 
> On Fri, Feb 22, 2019 at 7:08 AM Te-Chuan Huang <tchuang.phys AT gmail.com> 
> wrote:
> Dear All,
> 
> Please find my slides at: 
> https://drupal.star.bnl.gov/STAR/system/files/TeChuan_FTS_20190221.pdf
> Sorry for sending this out a bit late.
> 
> Dear Elke,
> 
> Followings are my answer but they may not be 100% correct.
> 
> There are two things:
> First, about two weeks ago, I found some inconsistencies of the efficiency 
> between my results and Guannan’s.
> Now we know the discrepancy is come from the nHitsFit>=5 cut that I used to 
> make sure the track quality.
> However, as you can find in my slides, this cut affect the efficiency a lot 
> and make strange eta dependency.
> We want to check that with the price we paid (decrease the efficiency), how 
> much we can gain from this cut.
> 
> Second, We found a bug in Guannan’s silicon fast simulator at about the 
> same time.
> He fixed the bug and additionally he updated the silicon to 8 constant R 
> segmentations within R from 5cm to 28 cm.
> 
> There are basically two reason I redo the study: 
> 1) we want to make sure the bug and the changes will not affect Guannan's 
> previous results. 
> 2) More realistic simulation is needed to make the conclusion on how many 
> silicon disks we need. This can further divide into two part: the particles 
> distributions from collisions (pythia and hijing) and the tracking 
> algorithm in non-uniform magnetic fields. First one is more easy and that 
> is what I’m doing but the later one is not. I’m just do the thing that I am 
> able to do now.
> 
> Cheers,
> Te-Chuan
> 
> 
> 
> > On Feb 21, 2019, at 3:27 PM, Aschenauer Elke-Caroline <elke AT bnl.gov> 
> > wrote:
> > 
> > Dear All,
> > 
> > sorry, I could not dial in today.
> > I’m still confused what the exact goal of these simulations is. Can 
> > somebody please explain to me why we study this again?
> > 
> > Thanks elke
> > 
> > 
> > 
> > 
> >> On Feb 21, 2019, at 16:01, Yi Yang <yiyang AT ncku.edu.tw> wrote:
> >> 
> >> Dear all,
> >> 
> >> Please find the meeting minutes in the following and please let me know 
> >> if I missed anything. 
> >> 
> >> News
> >> - No news. 
> >> 
> >> Sensor
> >>   - NDL: Li finished the preliminary test on the first batch of the 
> >> sensor. The results are expected. 
> >>              Yi will check the status of the second batch with NDL.
> >>   - Hamamatsu: The updated purchase order just submitted yesterday 
> >> (change the testing requirement from 40 mum to 60 mum). 
> >> 
> >> Mechanical structure 
> >>   - 3D printing prototype will be finished next Monday. 
> >>   - The design of the first "real" prototype will be finalized in these 
> >> two days and the company will provide the quotation tomorrow (2/22). The 
> >> production will be started soon. 
> >>   - The SolidWorks files were successfully transformed into the GDML 
> >> format. Te-Chuan will contact Jason for the next step. 
> >>   - Need to arrange a meeting with Rahul for the limitation on the STAR 
> >> structure.  
> >>   
> >> T-board, Hybrid
> >>   - Jianing presented the connector selection, Nicomatic is preferred. 
> >> Yi and Han-Sheng will check whether this can be fitted into the current 
> >> mechanical structure and we need to get the comments/confirmation from 
> >> Gerard. The decision should be made soon (next week). 
> >>   - Jianing has modified the design of T-board with both connectors on 
> >> the same side (old connector), and the size remains the same (no extra 
> >> layer). 
> >>   - Once the connector is decided, Jianing will update all the designs.  
> >> 
> >> Simulation
> >>   - Te-Chuan just finished the analysis, and he will send out the 
> >> detailed report later. Quick summary: the results with tighter cut on 
> >> the hits requirement have better charge misidentification rate 1% vs 2% 
> >> (with out hits requirement). But the momentum resolution and efficiency 
> >> are about the same. 
> >>   - Te-Chuan also finished the comparison between different 
> >> configurations (only sTGC, 1 FST + sTGC, 2 FST + sTGC and 3 FST + sTGC). 
> >> The efficiencies are similar, but the momentum resolution is much better 
> >> in the 3 FST + sTGC. Detailed results will be presented in his report, 
> >> too. 
> >>   - Te-Chuan will also perform the Hijing simulations. 
> >> 
> >> 
> >> Cheers,
> >> Yi
> >> 
> >> 
> >> +++++++++++++++++++++++++++++++++++++++++++++++++++
> >> Yi Yang, Assistant 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: http://phys.ncku.edu.tw/~yiyang 
> >> +++++++++++++++++++++++++++++++++++++++++++++++++++
> >> 
> >> 
> >> On Thu, Feb 21, 2019 at 9:26 PM 董家宁 <jndong AT sdu.edu.cn> wrote:
> >> Dear All,
> >> 
> >> 
> >> 
> >> I'd like to show some updates about the connector selection, you can 
> >> find the slides below:
> >> 
> >> https://drupal.star.bnl.gov/STAR/system/files/Connector_selection_update_190221.pdf
> >> 
> >> See you in the talk.
> >> 
> >> 
> >> 
> >> Best regards,
> >> 
> >> Jianing & Li
> >> 
> >> 
> >> 
> >> -----原始邮件-----
> >> 发件人:"Yi Yang" <yiyang AT ncku.edu.tw>
> >> 发送时间:2019-02-21 20:48:05 (星期四)
> >> 收件人: star-fst-l AT lists.bnl.gov
> >> 抄送: 
> >> 主题: [Star-fst-l] Weekly FST meeting - 2/21/2019
> >> 
> >> Dear all,
> >> 
> >> Sorry for the last minute reminder. We will have our regular meeting at 
> >> 9 am BNL time (today!). 
> >> Since I can't create the meeting page, so please send the report/link to 
> >> the list. 
> >> Bluejeans meeting information:
> >> Meeting URL https://bluejeans.com/101020434 
> >> Meeting ID 101 020 434
> >> Dial one of the following numbers:+1.888.240.2560 (US Toll Free)
> >> 
> >> Talk to you soon.
> >> 
> >> Cheers,
> >> Yi
> >> 
> >> +++++++++++++++++++++++++++++++++++++++++++++++++++
> >> Yi Yang, Assistant 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: http://phys.ncku.edu.tw/~yiyang 
> >> +++++++++++++++++++++++++++++++++++++++++++++++++++
> >> 
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