Star-fst-l mailing list

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

Hi Daniel, Krishan and Shenghui,

It was briefly discussed at today’s Forward Upgrade meeting what simulation 
studies are being pursued by the FST groups. It was suggested to prioritize 
these studies and post it on the FST list. In the following, I will try to 
summarize my personal view. Comments/suggestions are welcome.

Tasks:
6) Studying the tracking performance by varying the Z-locations of FST disks, 
and number of r/phi segments - Daniel/Krishan
7) Looking into FST simulation and track reconstruction to compare 300 vs 500 
micron thick sensors - Shenghui
8) FST slow simulator with efficiency/resolution measured with prototypes and 
study tracking performance - Gavin/Shenghui

Status:
6) Previously Daniel's simulation/tracking code did not use FstFastSimulator 
but used an internal function to “smear” FST MC hits in a similar way as 
FstFastSimulator, and read in hard-coded (?) hit uncertainties in a few 
places in the code to do tracking. When Krishan varied the numbers of r and 
phi segments, he saw little/no changes in tracking performance because not 
all the hard-coded uncertainties were changed accordingly. Daniel is working 
on incorporate FstFastSimulator written by Te-Chuan into his 
simulation/tracking package. Krishan is waiting for the updated code from 
Daniel.
7) Looked at efficiency, momentum resolution, secondary particle production, 
and photon conversions. No significant differences were found. The 
distribution of primary particle z-vertex distribution is puzzling and 
suggested a further change in the selection is needed. 
(Zhenyu/Jason) try to draw the FST material budget as a function of eta and 
phi, with separated contributions from different components. The total 
material budget for the FSTM volume looks reasonable, but problematic with 
separated components. 
8) just started

Outcome:
6.a) A working simulation/tracking package using FstFastSimulator - must have 
(Daniel)
6.b) Difference in tracking performance with different number of r and phi 
segments - not critical (Krishan), need 6.a)
7.a) Difference between 300 and 500 micron thick Si sensors - must have 
(Shenghui)
7.b) Material budget plot for FST, broken up into components - not critical 
(Zhenyu/Jason)
8.a) FST slow simulator - must have (Gaven/Xu)
8.b) Tracking performance with FST slow simulator and Daniel’s tracking code 
- must have (Gavin/Shenghui), need 6.a)

*** Must have: must have for the reviews

Best,
Zhenyu