Star-fst-l mailing list

[Zhenyu Ye <yezhenyu2003 AT gmail.com>]

Not until now!

> On May 20, 2019, at 3:20 PM, Aschenauer Elke-Caroline <elke AT bnl.gov> wrote:
> 
> Dear Guannan and Te-Chuan,
> 
> is Jason subscribed to this email list?
> 
> Cheers elke
> 
> 
>> On May 20, 2019, at 15:28, Guannan Xie <xieguannanpp AT gmail.com> wrote:
>> 
>> Hi Te-Chuan,
>> 
>> Let me try to answer these questions first base on my understands, but 
>> definitely, Jason's answer is more than welcome since he designed this 
>> code structure.
>> 
>> For the first question, there are some previous studies can be found in 
>> the previous fts review. It was inherited from that, you may try turning 
>> it off to see whether there is an impact or not if you like.
>> https://drupal.star.bnl.gov/STAR/future/proposals/forward-upgrade-project
>> 
>> For the second question, i am not sure why it was designed like that, but 
>> you may see the ErrorMatrix was propagated in the hack code. "Hack1to6()"
>> 
>> Regards,
>> Guannan
>>  
>> 
>> On Mon, May 20, 2019 at 1:19 PM Te-Chuan Huang <tchuang.phys AT gmail.com> 
>> wrote:
>> Hi Guannan (and maybe Jason),
>> 
>> I have basically finished implementing the current mechanical design into 
>> AgML geometry.
>> Now, I am working on modifying the fast simulator according to the new 
>> geometry.
>> However, I met few questions and need some helps from you:
>> 
>> 1.) There is one procedure in the simulator that I can not fully 
>> understand.
>> The simulator reconstructed the hits followed the procedure below:
>> First, shifted the GEANT hit by:
>>         xc = mRaster * TMath::Cos(idisk * 60 * TMath::DegToRad());
>>         yc = mRaster * TMath::Sin(idisk * 60 * TMath::DegToRad());
>> and then,
>>         xx = x - xc;
>>         yy = y - yc;
>> Second, use xx and yy to find the corresponding segment on the disk.
>> Third, find the middle point of the corresponding segment (r0 for the 
>> radius and p0 for the azimuthal angel).
>> Finally, shifted back the hit position by:
>>         x0 = r0 * cos(p0) + xc;
>>         y0 = r0 * sin(p0) + yc
>> where x0 and y0 are the finally reconstructed hit position in x-axis and 
>> y-axis.
>> Somewhere in the codes commented this shift as “Raster each disk by 1mm, 
>> 60 degree offset for every disk”.
>> But I can not understand why do we need this “raster” procedure.
>> 
>> 2.) Second question is about the assignment of the hit position error.
>> I found in the codes, because of the design of silicon strips, first find 
>> the error on the radius and azimuthal direction (dr and dphi).
>> In the end, radius and the azimuthal angel are transform to x and y 
>> position.
>> But somehow the dr and dphi are directly assigned as the error on the 
>> x-direction and y-direction, respectively.
>> Any assumption or approximation is applied on this error assignment?
>> 
>> Cheers,
>> Te-Chuan
>> _______________________________________________
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>> 
>> 
>> -- 
>> 
>> 
>> ===========================
>> Guannan Xie
>> Department of Physics
>> University of Illinois at Chicago
>> 845 West Taylor Street, 2262 SES, MC 273
>> Chicago, Illinois 60607-1234
>> Tel: +1-510-965-8919
>> Email: xieguannanpp AT gmail.com
>> ===========================
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