Star-fst-l mailing list

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

Minutes

Attendees: Elke, Flemming, Han-Sheng, Jianing, Krishan, Maowu, Mike, 
Prithwish, Te-Chuan, Xu, Yi

1. Mechanical structure - Yi Yang/Han-Sheng Li
The first prototype mechanical structure is assembled at AIDC. It uses the 
hybrids from the new hybrid vendor. The outer hybrid, due to the empty space 
in the middle of the outer structure, is sagging into the empty space of the 
structure. AIDC is working on improvement for the second prototype, which 
will use the hybrids from the old hybrid vendor, by adding a supporting block 
into the empty space. It is expected to be ready next Week. 

The first prototype mechanical structure has been measured at AIDC using 
mechanical survey gauge. The maximum deviation from a flat surface is about 
150microns for the inner and 270 microns for the outer structure. It is 
speculated that there is a non-negligible amount of force brought by the 
mechanical gauge on the structure during the survey, making the structure 
into a convex shape. Yi will find optical survey gauge to avoid this issue. 
It was suggested to measure more points and Yi agreed. It was pointed out 
that the measured deviation is larger than the required tolerance of 100 
microns. Yi said he is in contact with AIDC to try to improve. The goal would 
be to assemble two prototype mechanical structures, and discuss with Fermilab 
engineers to see whether they can work with them. There is a number 1.4328 mm 
quoted for the relative shift/tilt between the inner and outer structure, but 
it is unclear what the number represent. Yi will try to explain later. 

Yi has a plan to make the storage boxes using two different kind of materials 
from two companies. Both of them are expected to be ready next week. 

Yi confirmed the radiation length in GEANT model by Flemming. He will try to 
calculate the weight of a module, by considering the weight of sensors, chip, 
and coolant. 

Yi has also purchased equipment to set up a test stand to measure the 
compatibility of chosen soft cooling tubes with NOVEC. It is expected to be 
ready next week. The plan would be to measure them at NCKU using this new 
setup, expose the soft tubes to radiation, and remeasure it again at NCKU. We 
discussed a few places where we can do the irradiation exposure. Elke will 
check whether the service at BNL is free. Others will also look into other 
options, such as Univ of Massachusetts at Lowell or a place mentioned by 
Gerrit to Elke/Flemming. We will compose a list of such options for further 
discussion.

2. Cooling system
Flemming is going to ask Rahul the status of cooling system refurbishment. 

3. Prototype in STAR for Run20
It was agreed that we won’t look for installing a FST prototype module into 
STAR in Run20. But we will try to integrate the detector into STAR DAQ system 
during the Fall shutdown this year, when Tonko and Gerard are at BNL.


Best,
Zhenyu

> On Feb 1, 2020, at 3:00 PM, Ye, Zhenyu <yezhenyu AT uic.edu> wrote:
> 
> The link should have been 
> https://drupal.star.bnl.gov/STAR/event/2020/02/03/fst-group-meeting
> 
> 
>> On Feb 1, 2020, at 9:59 PM, Ye, Zhenyu <yezhenyu AT uic.edu> wrote:
>> 
>> Dear all, 
>> 
>> We will have the Weekly FST meeting on Monday starting at 9am EST (BNL 
>> local time).
>> 
>> https://drupal.star.bnl.gov/STAR/event/2020/01/27/fst-group-meeting
>> 
>> Bluejeans Meeting URL https://bluejeans.com/101020434
>> Meeting ID: 101 020 434
>> 
>> Meeting agenda:
>> 
>> 1. Mechanical structure - Yi/Hansheng 
>> Status of mechanical structure prototype and assembly
>> Thermal simulation and measurement 
>> Soft cooling tube test
>> 
>> 2. Tracking - Krishan
>> 
>> 3. Prototype for Run20
>> 
>> Zhenyu
>