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[Aschenauer Elke-Caroline <elke AT bnl.gov>]

Hi HI,

I have a couple of comments.

slide 5: one needs to define what you mean by good for ES&H, does this mean already approved becuase of earlier us in STAR or what 

side 7 is completely redundant, if you want to show it, but it in front of slide 4

slide 11: do we have a definition of the cable, meaning a link to the vendor and webpage or …… just something which gives info

slide 14: is not very helpful for this review, as it does not say what materials are used for the support structure and this review is not a design review / safety review for this much more detail needs to be provided.

Cheers elke

On Oct 16, 2020, at 10:47, videbaek <videbaek AT bnl.gov> wrote:

HI ZHENYU

A FEW COMMENTS TO THE SLIDES.
Do you have the old report on the ESCR review for IST?

slide 9:

For the HV add the info on modules from the IST slides
(Iseg <100V, <1 mA, BNC if correct)

slide 11
Understand you are not finished- add flamability result
Doe we have the specs for the cable (Mike, Gerard?)

slide 14 bullet 3 to ESCR at later review

move slide 15 to backup

best Flemming







On 2020-10-15 23:02, Ye, Zhenyu wrote:

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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--
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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