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

Hi Xu,

   Ok, thanks for clarifying. I have no theory what is going on. I hope that we don't see this problem on more cables.

   Mike, I guess we should hi-pot the lines used for bias, to all other lines. 200 VDC is probably a good test voltage. Current limiting certainly should be done for such a test (10 uA or so is good. maybe use one of them NIM wire chamber PS modules, if can be set to such a low voltage? I am not sure.)

   Or maybe we can hope you see something on visual inspection.

    Gerard

---

From: Xu Sun <sunxuhit AT gmail.com>
Sent: Monday, February 15, 2021 1:33 PM
To: Visser, Gerard <gvisser AT indiana.edu>
Cc: Star-fst L <star-fst-l AT lists.bnl.gov>
Subject: Re: [Star-fst-l] Weekly FST meeting, Feb 15 8:30am (BNL time)

 

Hi Gerard,

> So, after a little while power off, you reconnected GC26, saw no issue at first (??) then set inner HV to 140 V and then there was this noise issue and it remains after no matter what the HV is set to?

This one is what I observed.

Best,

Xu

On Mon, Feb 15, 2021 at 12:31 PM Visser, Gerard <gvisser AT indiana.edu> wrote:

hi Xu,

So, after a little while power off, you reconnected GC26, saw no issue at first (??) then set inner HV to 140 V and then there was this noise issue and it remains after no matter what the HV is set to?

Or, after a little while power off, you reconnected GC26 and immediately saw the issue, no matter what the HV is set to?

Sorry to be pedantic but there is something strange with this problem and we may need more clues.

Thanks

            Gerard

---

From: Xu Sun <sunxuhit AT gmail.com>
Sent: Monday, February 15, 2021 1:10 PM
To: Visser, Gerard <gvisser AT indiana.edu>
Cc: Star-fst L <star-fst-l AT lists.bnl.gov>
Subject: Re: [Star-fst-l] Weekly FST meeting, Feb 15 8:30am (BNL time)

 

Hi Gerard,

> Did you guys power cycle the readout system after the mysterious noise appeared with GC26?

Yes, we have done it multiple times before we switch to GC13.

> I wonder if power cycling might have fixed it or it was definitely confirmed to be the cable GC26, e.g. you put that one back again and problem appeared again even w/o bias?

To confirm the issue, I just re-connected the GC26 again, and the issue appeared again. It will appear after inner HV ramp to 140V and stays there no matter what the HV is.

> On the T board fitting - is it going to be possible to fasten the T board to mechanical structure with screws and nuts?

I believe it is possible to do that with proper nuts. But I don't know what kind of nuts will be proper. And the outer hybrid will be bend slightly since the T-board will be attached to the MS through the nuts.

Best,

Xu

 

On Mon, Feb 15, 2021 at 10:36 AM Visser, Gerard <gvisser AT indiana.edu> wrote:

hi Xu,

   Did you guys power cycle the readout system after the mysterious noise appeared with GC26? (I assume it was power cycled in the changing to GC13. I wonder if power cycling might have fixed it or it was definitely confirmed to be the cable GC26, e.g. you put that one back again and problem appeared again even w/o bias?

   I can't recall that we ever had such a problem before. Please inspect the pins on the connectors, though I guess you already have done that and would have mentioned if one looked damaged.

   On the T board fitting - is it going to be possible to fasten the T board to mechanical structure with screws and nuts? If not, I'm a little worried that moving the cable around as things get installed may flex something and cause troubles.

      - Gerard

---

From: Star-fst-l <star-fst-l-bounces AT lists.bnl.gov> on behalf of Xu Sun <sunxuhit AT gmail.com>
Sent: Monday, February 15, 2021 11:12 AM
To: Capotosto, Michael <capotosto AT bnl.gov>
Cc: Star-fst L <star-fst-l AT lists.bnl.gov>
Subject: Re: [Star-fst-l] Weekly FST meeting, Feb 15 8:30am (BNL time)

 

Hi Mike,

My slides can be found in the following link:

https://drupal.star.bnl.gov/STAR/system/files/FstModuleAssemblyFeb08Feb142021.pdf

We will need your help on the new purple cable test shown in slide 3 and gray cable issue discussed in slide 5.

Please let us know your comments.

Best,

Xu

On Sun, Feb 14, 2021 at 11:07 PM Capotosto, Michael <capotosto AT bnl.gov> wrote:

Hey Zhenyu, all,

Monday is a lab holiday so you may be short some people.

--Mike

-----Original Message-----
From: Star-fst-l <star-fst-l-bounces AT lists.bnl.gov> On Behalf Of Ye, Zhenyu
Sent: Sunday, February 14, 2021 7:30 PM
To: Star-fst L <star-fst-l AT lists.bnl.gov>
Subject: [Star-fst-l] Weekly FST meeting, Feb 15 8:30am (BNL time)

Dear all,

We will have a weekly FST meeting tomorrow starting at 8:30am EST (BNL local time).

https://drupal.star.bnl.gov/STAR/event/2021/02/15/star-forward-silicon-tracker-meeting

0. follow-ups on review and action items *
1. Integration                                                                by Rahul Sharma, Felix Archampong
2. Hybrid and T-board                                                 by Maowu Nie, Mike Capotosto
3. Mechanical Structure                                                by Yi Yang
4. Production module assembly                                    by Xu Sun/Shenghui Zhang

* https://drupal.star.bnl.gov/STAR/event/2021/02/15/star-forward-silicon-tracker-meeting/follow-action-items

Zhenyu

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