Star-fst-l mailing list

[Zhenyu Ye <yezhenyu2003 AT gmail.com>]

Meeting minutes

News - Zhenyu
1) Adjustment of milestone timeline 
In accordance with module assembly schedule, we will move the completion of 
production module assembly by 2 months, and the others by 4 months
2) Hamamatsu Silicon sensors 
Received 4+6 prototype sensors from Hamamatsu on Aug 22

Hamamatsu sensor - Zhenyu, Andres
1) Baby sensors 
continue measurements with 3 baby sensors. Low leakage current measured from 
2 of them over extended period of time (2 weeks). The large leakage current 
increase seen with the InnerSensor Chip1 could be due to mis-handing during 
the measurement
2) Prototype sensors 
By eye, the sensor shapes/sizes seem to match with those of the hybrids. More 
detailed inspection will be done under microscope. The IV/CV curves for inner 
sensors look reasonable, while those for outer sensors look odd. Will study 
by measurements and simulation.

Mechanical structure - Yi, Han-shen 
1) Cooling tube 
The cooling tube work is now in AIDC’s queue. 8 of them by the end of October
2) Hybrid mounting
Soldering will need to be done at ~200 degree C. Plan to do soldering first 
then gluing hybrids onto module structure. Jigs are needed for aligning the 
hybrids w.r.t. module structure. Alignment by eye for initial mounting.
3) Module holding frame
Han-shen started working on the drawings 

Simulation - Te-Chuan, Krishan
1) GEANT model
Te-chuan is still working on implementing cooling tubes into GEANT 
2) tracking study 
Krishan discussed results from Daniel’s tracking code and Te-chuan’s detector 
simulation.

Action items:
1) Jianing will contact the Nicomatic agent to understand (confirm) the 
possible issue with the connectors
2) Jianing will find out the dimensions of the components on T-board so that 
Han-Shen can be included into CAD drawings 
3) Yi will check the compatibility of T-board and mechanical structure, 
seeing if there is a space to accommodate the components on the T-board. 
Maybe adding spacers
4) Yi will find out from EASTON and AIDC the tolerance of the module 
structure and hybrid mounting
5) Krishan will forward the instruction to run Daniel’s tracking code, and 
understand the nHits requirement (true hit or accept any?)

> On Aug 27, 2019, at 1:31 PM, Zhenyu Ye <yezhenyu2003 AT gmail.com> wrote:
> 
> Dear all,
> 
> We will have a meeting at 9am BNL time tomorrow (Thursday August 29). The 
> meeting agenda and bluejeans info can be found at 
> 
> https://drupal.star.bnl.gov/STAR/blog/yezhenyu/forward-silicon-tracker-weekly-meeting
> 
> 1. News - All
> 2. Hamamatsu silicon sensor - Zhenyu Ye
> 3. Mechanical Structure - Yi Yang, Han-sheng Li
> 4. Simulation - Te-Chuan Huang, Krishan Gopal
> 
> Best,
> Zhenyu