Star-fst-l mailing list

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

Hi Daniel,

 I am resending my email in case you missed it.

Best,
Zhenyu

> On Jul 22, 2020, at 12:04 PM, Ye, Zhenyu <yezhenyu AT uic.edu> wrote:
> 
> Hi Daniel,
> 
> Thanks for the update. I was able to install and run fst_study.C, which 
> uses the Fast Simulator in my computer. Shenghui and Gavin will check if 
> the results are consistent with the previous version of the code using the 
> function SiRasterizer, and also develop and test the slow simulator.
> 
> Let me try again to explain my confusion about the FST and sTGC Fast 
> simulators:
> 
> 1. In your current GitHub area, you use StFtsFastSimulatorMaker, which 
> includes both FST and sTGC in one cxx file.
> 
> 2. In Te-Chuan’s latest work area (April 14, 2020) on RCF, 
> /star/u/tchuang/FST_simulations/README, he noted:
> 
> ******************************************************
>    - There are two versions of fast simulator:
>        - StFtsFastSimulatorMaker: Old fast simulator which has been updated 
> for silicon part but STGC part was obsoleted.
>        - 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.
> ******************************************************
> 
> So there are separated makers for FST and sTGC, StSiSimulatorMaker and 
> StStgcSimulatorMaker, taken from YOUR directory. 
> 
> We talked about separating FST and sTGC fast simulators a few times, and 
> you agreed to get them separated. I was glad to see they were indeed 
> separated, and thus I was under the impression that we are moving away from 
> StFtsFastSimulatorMaker (the Old fast simulator as noted by Te-chuan), and 
> use the separated fast simulators. But now I am totally confused by what 
> you wrote below and what you use in GitHub for forward tracking study. 
> 
> I hope this helps to explain my confusion, and you can answer my questions:
> 
> 1. Which Fast Simulator (StFtsFastSimulatorMaker, StSiSimulatorMaker and 
> StStgcSimulatorMaker) is the latest version?
> 2. Why do you use the StFtsFastSimulatorMaker for tracking studies
> 
> I hope we should settle down on this both for now (which I thought we did 
> already but … ) and for the future. 
> 
> Thanks,
> Zhenyu
> 
>> On Jul 17, 2020, at 3:10 PM, Daniel Brandenburg 
>> <dbrandenburg.ufl AT gmail.com> wrote:
>> 
>> Hi Zhenyu,
>> I pushed the updated README to the github main branch. It includes a 
>> section about running 'fst_study.C'
>> 
>> I used the Fast simulator that Te-Chuan told me was up-to-date. I checked 
>> with him twice to be sure I got the correct one- once before the 
>> discussion in FST meeting and then again once after. If something needs to 
>> be changed just have them send me a pull request with the changes. 
>> 
>>> 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)?
>> I am not sure what you mean by "combined and separated fast simulator"
>> 
>> If you are referring to the Si Fast simulator that I wrote then you can 
>> find it here:
>> https://github.com/jdbrice/star-sw/blob/9e7d22967c643c0c3ea0e7174414537c81900730/StRoot/StgMaker/StgMaker.cxx#L67
>> My version is much simpler than the FstFast simulator and simply places 
>> the hit at the center of the r-phi area for a given sensor. Maybe it is 
>> missing something that the full fast simulator does but it is easier to 
>> change the parameters.
>> 
>> And the code to compute the covariance matrix by inverting the jacobian 
>> transform matrix is here:
>> https://github.com/jdbrice/star-sw/blob/9e7d22967c643c0c3ea0e7174414537c81900730/StRoot/StgMaker/StgMaker.cxx#L325
>> 
>> Please have them let me know if there are any problems. I ran a few tests 
>> but I have not yet run a large statistics run since making the swap to the 
>> FST Fast Simulator. 
>> 
>> Best,
>> Daniel
>> 
>> 
>> On Wed, Jul 15, 2020 at 7:38 PM Ye, Zhenyu <yezhenyu AT uic.edu> wrote:
>> Hi Daniel,
>> 
>> I resend you these emails in case you missed them. I appreciate timely 
>> reply from you.
>> 
>> Thanks,
>> Zhenyu
>> 
>>> On Jul 15, 2020, at 12:26 AM, Ye, Zhenyu <yezhenyu AT uic.edu> wrote:
>>> 
>>> 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
>>> 
>> 
> 
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