Star-fst-l mailing list

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

Dear all,

I have made some slides for the ESRC review next Monday (Slides on inner 
signal cable/T-board and summary are not finished). Your comments are 
welcome. 

https://drupal.star.bnl.gov/STAR/event/2020/08/24/star-forward-silicon-tracker-meeting/safety-pre-approval-materials

Best,
Zhenyu

PS. Slides for IST safety review can also be found in the above webpage 

> On Oct 9, 2020, at 12:31 PM, Ye, Zhenyu <yezhenyu AT uic.edu> wrote:
> 
> Hi All,
> We are asked by CAD to do a safety review for FST on Monday Oct 19 2pm. 
> Meeting info will be sent later. 
> Zhenyu
> 
>> Begin forwarded message:
>> 
>> From: pak <pak AT rcf.rhic.bnl.gov>
>> Subject: Re: Pre-approval for STAR Forward Silicon Tracker materials
>> Date: October 8, 2020 at 6:17:50 PM CDT
>> To: "Ye, Zhenyu" <yezhenyu AT uic.edu>
>> Cc: flemming videbaek <videbaek AT bnl.gov>, Robert Pak <pak AT bnl.gov>, Yi 
>> Yang <yiyang AT ncku.edu.tw>
>> 
>> 
>> Hello Zhenyu,
>> 
>> I forwarded your e-mail from Sept. 3rd to the ESRC Chair (attached below). 
>>  They asked for guidance from a materials specialist at CAD.  That person 
>> did not respond all this time, because they had surgery, and are on 
>> medical leave.  The ESRC Chair asked their stand-in for guidance, who 
>> suggested to have a review of the Si tracker.
>> 
>> The slides should include an overview of the detector, with emphasis on 
>> the hazards to personnel and hazards to equipment.  In my experience with 
>> Si detectors, the first category is minimal.  The second category has 
>> greater risks involved, because Si detector are relatively fragile and can 
>> be potentially damaged if proper precautions are not taken.  Of course you 
>> and Flemming are well aware of this from experience with the HFT.  That is 
>> why I am confident you will be able to handle this review.  Attached is an 
>> example from a similar review today.
>> 
>> 
>> On 2020-10-08 17:56, Ye, Zhenyu wrote:
>>> Hi Robert,
>>> We asked for pre-approval of materials, not a full safety review. What
>>> info should be included in the slides that the CAD would like to see?
>>> Do you have examples that can share with us.
>>> Thanks,
>>> Zhenyu
>>>> On 2020-10-08 17:27, pak wrote:
>>>>> Hello Zhenyu,
>>>>> The CAD representative standing in for the materials expert decided
>>>>> they would like a review of the Si tracker.  That is a tentative time,
>>>>> because it does not work for me.  Does it work for you?
>>>>> Also, would you be available to give the presentation on Monday
>>>>> instead?  It is a Lab Holiday, but that works for me.
>>>>> Robert Pak
>>>>>>> On Oct 7, 2020, at 9:00 AM, pak <pak AT rcf.rhic.bnl.gov> wrote:
>>>>>>> Hello Zhenyu,
>>>>>>> The ESRC Chair was OK, but he reached out to someone else at CAD.  I 
>>>>>>> pinged them both again for any final questions/comments.
>>>>>>> Robert Pak
>>>>>>> On 2020-10-07 09:45, Ye, Zhenyu wrote:
>>>>>>>> Hi Robert,
>>>>>>>> Is there any feedback from Chair of the Experimental Safety Review
>>>>>>>> Committee at CAD?
>>>>>>>> Thanks,
>>>>>>>> Zhenyu
>>>>>>>>> On Sep 4, 2020, at 6:29 AM, Ye, Zhenyu <yezhenyu AT uic.edu> wrote:
>>>>>>>>> Robert, Thanks a lot for the help. Yes, indeed. We don’t think 
>>>>>>>>> there is no issue with most of the materials we use for the Silicon 
>>>>>>>>> Tracker, as they are commonly used in other Silicon detectors, but 
>>>>>>>>> feel it would be better to run it across the safety before the 
>>>>>>>>> production starts.
>>>>>>>>> Best,
>>>>>>>>> Zhenyu
>>>>>>>>>> On Sep 4, 2020, at 5:42 AM, pak <pak AT rcf.rhic.bnl.gov> wrote:
>>>>>>>>>> OK Zhenyu, I will forward this e-mail to the Chair of the 
>>>>>>>>>> Experimental Safety Review Committee at CAD.  I really don't see 
>>>>>>>>>> any issue.  That's one of the benefits of a Si detector, 
>>>>>>>>>> relatively low safety hazard (spoken by someone who spent 9 years 
>>>>>>>>>> in Phobos and was recruited to build Si detectors in PHENIX).
>>>>>>>>>> Robert Pak
>>>>>>>>>> On 2020-09-03 18:58, Ye, Zhenyu wrote:
>>>>>>>>>>> Hi Rboert,
>>>>>>>>>>> Yes, we are aware of the compatibility requirement of the cooling
>>>>>>>>>>> tubes and NOVEC, and have selected two candidate tubes made of 
>>>>>>>>>>> plastic
>>>>>>>>>>> based on vendor’s recommendation.
>>>>>>>>>>> The materials that we will use to build FST detector modules, 
>>>>>>>>>>> cooling
>>>>>>>>>>> tubes and cables, include
>>>>>>>>>>> 1. Mechanical structure made of pure PEEK (not carbon fibre. See 
>>>>>>>>>>> page
>>>>>>>>>>> 3 of Ref [1])
>>>>>>>>>>> 2. Cooling tubes embedded in each module made of Stainless steel
>>>>>>>>>>> coated with Chroming (see page 3 of Ref [1])
>>>>>>>>>>> 3. Cooing tubes connecting adjacent modules made of plastic (see 
>>>>>>>>>>> page
>>>>>>>>>>> 27 of Ref [1])
>>>>>>>>>>> 4. Flexible PCB, made of Polyimide (see Ref [2])
>>>>>>>>>>> 5. Glue and Thermal Grease used for Mechanical structure and 
>>>>>>>>>>> flexible
>>>>>>>>>>> PCB assembly (see page 3 of Ref [1])
>>>>>>>>>>> 6. Electronic board, made of FR-4 (see Ref [3])
>>>>>>>>>>> 7. Inner signal cable, the ones that Mike gave to you for 
>>>>>>>>>>> Flammable test
>>>>>>>>>>> 8. Glue used for mounting Silicon sensors and frontend readout 
>>>>>>>>>>> chips,
>>>>>>>>>>> but they are the same as we used for STAR Intermediate Silicon 
>>>>>>>>>>> Tracker
>>>>>>>>>>> (2014-2016). I suppose they are fine.
>>>>>>>>>>> [1] 
>>>>>>>>>>> https://indico.bnl.gov/event/9021/contributions/39989/attachments/29767/46442/20200803_FST_Mechanical_YiYang_v4.pdf
>>>>>>>>>>> [2] 
>>>>>>>>>>> https://drupal.star.bnl.gov/STAR/system/files/Datasheet%20for%20hybrid%20v3_0.pdf
>>>>>>>>>>> [3] 
>>>>>>>>>>> https://drupal.star.bnl.gov/STAR/system/files/Datasheet%20for%20T-Board%20v3_1_0.pdf
>>>>>>>>>>> We are wondering what kind of info is needed for pre-approval 
>>>>>>>>>>> before
>>>>>>>>>>> we start the production.
>>>>>>>>>>> Thanks,
>>>>>>>>>>> Zhenyu
>>>>>>>>>>>> On Sep 3, 2020, at 4:36 PM, pak <pak AT rcf.rhic.bnl.gov> wrote:
>>>>>>>>>>>> Hello Zhenyu,
>>>>>>>>>>>> I am aware of the flame test for FST cable.  What other 
>>>>>>>>>>>> materials are specifically in question?  The detectors 
>>>>>>>>>>>> themselves and carbon fiber support structure are benign.  
>>>>>>>>>>>> Electronics boards are made of FR-4, which is a fire resistant 
>>>>>>>>>>>> version of G10.  NOVEC cooling fluid is standard stuff now.  
>>>>>>>>>>>> What you should be concerned about is the compatibility of your 
>>>>>>>>>>>> cooling tubes and NOVEC cooling fluid, or leaks may develop over 
>>>>>>>>>>>> time.  Also there is triboelectric charging (electrostatic build 
>>>>>>>>>>>> up) from the flowing NOVEC that may introduce leaks, but these 
>>>>>>>>>>>> are not safety issues.
>>>>>>>>>>>> Robert Pak
>>>>>>>>>>>> On 2020-09-03 13:11, Ye, Zhenyu wrote:
>>>>>>>>>>>>> Dear Robert,
>>>>>>>>>>>>> This is Zhenyu from Univ of Illinois at Chicago. I hope you are 
>>>>>>>>>>>>> doing well.
>>>>>>>>>>>>> I am the STAR FST upgrade project manager.  As you may know, 
>>>>>>>>>>>>> FST went
>>>>>>>>>>>>> through a production readiness review recently and we are about 
>>>>>>>>>>>>> to
>>>>>>>>>>>>> start the detector module, electronic board/cable production. 
>>>>>>>>>>>>> For this
>>>>>>>>>>>>> we would like to get a pre-approval (not sure if this is the 
>>>>>>>>>>>>> right
>>>>>>>>>>>>> name) for the materials we are going to use.
>>>>>>>>>>>>> I am wondering if you can tell me what kind of info we should 
>>>>>>>>>>>>> prepare
>>>>>>>>>>>>> for such a pre-approval review?
>>>>>>>>>>>>> Thanks,
>>>>>>>>>>>>> Zhenyu
>>>> --
>>>> Flemming Videbaek
>>>> senior scientist
>>>> videbaek @ bnl.gov
>>>> Brookhaven National Lab
>>>> Physics Department
>>>> Bldg 510D
>>>> Upton, NY 11973
>>>> phone: 631-344-4106
>>>> cell     :  631-681-1596
> 
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