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["Visser, Gerard" <gvisser AT indiana.edu>]

hi Yi,

  Thanks for the better picture of the situation. How thick does this spacer "washer" have to be, and can we find such a thing in stock? (Or I guess we could have them made.) Anyway it looks like it would fit nicely (as far as the hybrid to T board connections are concerned) if it was mounted by some spacers in roughly the position you are holding in the picture. So that is good and I think its a good plan; hopefully it won't be difficult to find the right spacers and use them. (Should they be glued to the T-board perhaps, to make it easier to put things together?)

    Gerard

---

From: Yi Yang <yiyang AT ncku.edu.tw>
Sent: Tuesday, February 23, 2021 8:42 AM
To: Visser, Gerard <gvisser AT indiana.edu>
Cc: Maowu Nie <maowu.nie AT email.sdu.edu.cn>; Star-fst L <star-fst-l AT lists.bnl.gov>; Ye, Zhenyu <yezhenyu AT uic.edu>
Subject: Re: [Star-fst-l] T-Board Assembly

 

Hi Zhenyu and Gerard,

I checked it again and I also noticed this conflict. It didn't happen last time, very strange.

I agree with your proposal #3 after talking to Maowu and Jinaning this afternoon. 

Cheers,

Yi

Visser, Gerard <gvisser AT indiana.edu>於 2021年2月23日 週二，上午6:43寫道：

hi Zhenyu, Yi,

 I suppose one could consider

4. make clearance hole on mechanical structure (if this conflict is in an unimportant place??)

Probably this is not the best plan but let's discuss. By the way are there any pictures clearly showing the conflict problem?

  About PEEK screws, I think that if any of these small screws and nuts might be removed/installed with  the detector on the mounting rails on STAR, we better use PEEK or other nonconductive material. This is to protect other parts of STAR (TPC, BEMC, TOF) in case anything is dropped. If it is decided the whole assembly comes down for any servicing e.g. to replace a T board, then they can just as well be metal screws. I'm not sure what the plan it. Hopefully all hardware up at the point of installation is large enough to see & handle easily, or is nonconductive.

   Gerard

---

From: Star-fst-l <star-fst-l-bounces AT lists.bnl.gov> on behalf of Ye, Zhenyu <yezhenyu AT uic.edu>
Sent: Monday, February 22, 2021 5:04 PM
To: Maowu Nie <maowu.nie AT email.sdu.edu.cn>
Cc: Star-fst L <star-fst-l AT lists.bnl.gov>
Subject: [Star-fst-l] T-Board Assembly

 

Maowu, thanks for confirmation.

There might be one small issue. The screws of the connectors on the T-board seem to be a little bit too long, so that it creates a small conflict with the module peek mechanical structure (MS). See page 3 in Xu’s presentation from last week’s FST meeting [1]. It seems to me that one can still press the T-board to fasten with the MS through the four corner holes. But the T-board and/or the MS has a tiny bend. As this observation is not fully consistent with what Yi reported in [2], I have asked Yi to check again.

If the answer is yes, I see 3 options

1. Shorten the screws (I don’t think it is possible but Maowu please confirm)
2. Leave as is
3. Add a washer between T-board and MS

A related question for the group is whether we should use PEEK screws/nuts to use to fasten T-board onto MS, as pointed out in Yi’s slides. I don’t recall we have come to a conclusion at the meeting (?) but we should decide soon.

Please comment.

Thanks,
Zhenyu

[1] https://drupal.star.bnl.gov/STAR/system/files/FstModuleAssemblyFeb08Feb142021.pdf
[2] https://drupal.star.bnl.gov/STAR/system/files/20201123_FST_MS_YiYang.pdf


> On Feb 22, 2021, at 3:21 PM, Maowu Nie <maowu.nie AT email.sdu.edu.cn> wrote:
>
> Hi Zhenyu,
>
> Thanks for the reminder, we will work on it.
>
> Regards,
> Maowu
>
>
>> On Feb 22, 2021, at 11:07 PM, Ye, Zhenyu <yezhenyu AT uic.edu> wrote:
>>
>> Hi Maowu, Jianing,
>>
>> We have tested the new T-boards/purple cables in the readout and found no problem.
>> Please go ahead with the T-board assembly and testing.
>>
>> Best,
>> Zhenyu
>>
>>> On Nov 11, 2020, at 4:12 AM, Maowu Nie <maowu.nie AT email.sdu.edu.cn> wrote:
>>>
>>> Hi Mike and Yi,
>>>
>>> We just finished the QC test of the first 10 sets of T-board , and will send them to you soon.
>>>
>>> Please confirm the following address for you is correct or not:
>>>
>>> 8 sets to Mike:
>>> Brookhaven National Laboratory, Shipping Department- Building 98 Upton, NY 11973,
>>> Michael Capotosto, capotosto AT bnl.gov.
>>>
>>> 2 sets to Yi:
>>> No.1 University Rd., East District, Tainan City, 70101
>>> National Cheng Kung University, Department of Physics,
>>> Yi Yang
>>>
>>> One thing I need to mention to you, the nuts in the connector have the shedding risk.
>>> So when you do installation, please make sure the screw is well tightened.
>>>
>>> Regards,
>>> Maowu
>>>
>>>
>>>
>>>
>>>
>>
>>
>

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