Star-fst-l mailing list

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

hi Mike,

  That plan for hipotting and for general continuity/short testing with B&K tester sounds right on.

  A wire chamber supply that will trip nicely with 10-100 uA setting will be best for the hipot. If you have one that can really be set as low as 200 V. I have not tried this myself. (I have also a Stanford Research PS350, which would do it I am pretty sure. Do you have one of those around? Or the ISEG supplies used for FST but that is more hassle to deal with (I think) since no local controls.) A series resistor like 100k-1M should also be used in the setup.

     Gerard

---

From: Capotosto, Michael <capotosto AT bnl.gov>
Sent: Tuesday, February 16, 2021 9:47 AM
To: Visser, Gerard <gvisser AT indiana.edu>; Star-fst L <star-fst-l AT lists.bnl.gov>
Subject: RE: [Star-fst-l] Weekly FST meeting, Feb 15 8:30am (BNL time)

 

Hey Gerard,

 

I believe one cable had two or three bent pins on one of the D-Sub connectors. I just didn’t get around to crimping on new pins to the bad spots – but I believe we added the second cable as a spare.

 

As far as testing purple cable assemblies, I ordered a few boards with headers to test point to point continuity through the T-Board and purple cable, but never got a chance to put any of them together and confirm I got all the pins correct.

 

For gray cable testing – I suppose the easiest way to do the hi-pot would be to short all unused/signal pins to ground through a connector, apply 200V to the bias pins, and look for current to increase. Do you think this is sufficient?

 

For testing pin to pin continuity we have a configurable B&K Cable Tester that can be used, so long as we have one known-good cable for the tester to “learn”.

 

Thoughts/comments?

 

--Mike

 

 

From: Star-fst-l <star-fst-l-bounces AT lists.bnl.gov> On Behalf Of Visser, Gerard
Sent: Monday, February 15, 2021 3:03 PM
To: 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 Flemming,

    Definitely that's right, we should test. (I hope we will not have to be testing for some obscure issue though. We better sort that out soon. Simple continuity, hipotting the bias wires, and visual inspection of the connectors, is all (I would hope) is needed.)

   What was the "connector issue"? Mechanical damage in the removal after IST? Or something else?

 

       Gerard

 

 

---

From: videbaek <videbaek AT bnl.gov>
Sent: Monday, February 15, 2021 2:25 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 and Mike,

This reminds we need to check before installation all the grey cables we
want to use.
Of the two grey cables we pulled on the south platform one had a
connector issues.
We should device a proper testing plan with setup for the grey cable in
physics and then start doing testing as filler job in the next few
months. TSimilar testing should be done for the purple cables once we
start producing them.

Best Flemming


On 2021-02-15 14:06, Visser, Gerard wrote:
> 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
>> [1]
>>
>> Zhenyu
>>
>> ********** ZOOM Meeting ********** **********
>> ID: 879 0430 2955
>> Passcode: fSTAR2021
>> ********** ********** ********** ********** *******
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--
Flemming Videbaek
senior scientist
videbaek @ bnl.gov
Brookhaven National Lab
Physics Department
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Upton, NY 11973

phone: 631-344-4106
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