Star-fst-l mailing list

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

Hi Daniel, 

I have a related request. You reported on Monday’s FST meeting that you 
updated the StgMaker to use FST Fast Simulator, and you were going to update 
the README and config file for the forward tracking package. Please correct 
me if I am wrong, but I don’t think the latter has been done yet as far as I 
can tell by looking at your GitHub area 
https://github.com/jdbrice/star-fwd-dev

Please kindly make these updates at your earliest convenience, so that Gavin 
and Shenghui can start running the updated tracking code with the Fast 
Simulator. 

Thanks and Best,
Zhenyu

> On Jul 14, 2020, at 12:39 PM, Ye, Zhenyu <yezhenyu AT uic.edu> wrote:
> 
> Hi Daniel, 
> 
> In your GitHub area for Forward Simulation and Tracking, 
> https://github.com/jdbrice/star-fwd-dev  
> I see the FST+sTGC combined fast simulator (StFtsFastSimulatorMaker) is 
> being used. 
> 
> When I look into Te-Chuan’s work area on RCF 
> /star/u/tchuang/FST_simulations/README
> 
> ************************
>    - There are two versions of fast simulator:
>        - StFtsFastSimulatorMaker: Old fast simulator which has been updated 
> for silicon part but STGC part was obsoleted.
>            - Use runFtsSim.C to run the fast simulator.
>            - I added some QA histograms about secondary particles in g2t 
> tables. You can see the variable "isShower" declared at line 539 and 
> histograms called "hTrutHitRShower[i]" which are the variable
> isShower vs. the mc truth hit position in r direction on different FST 
> disks.
>        - StSiSimulatorMaker and StStgcSimulatorMaker: Separated fast 
> simulator for FST and STGC done by Daniel (dbrandenburg.ufl AT gmail.com)
>            - I copied these codes from Daniel's directory. I have checked 
> StSiSimulatorMaker that is updated and I believe StStgcSimulatorMaker is 
> also updated.
>            - Use sim.C to run the fast simulator.
>            - Daniel didn't consider FST inefficiency in sim.C but you can 
> see how to implement this in runFtsSim.C.
> ************************
> 
> So I am wondering which version is the latest version. I tend to believe 
> the separated ones are, because we have discussed about this in some 
> meetings a while back (last year), and I believe we have agreed to split 
> the two. But then I don’t understand why the combined version is in GitHub.
> 
> Also, can you tell me if there is any difference between the combined and 
> separated fast simulator for how the FST hits are handled (how the hits are 
> smeared, what hit error matrix is put in etc)?
> 
> Thanks,
> Zhenyu