[Rgc] [EXTERNAL] Problem with FTCal

[Eugene Pasyuk]

Okay, let's have a zoom meeting tomorrow at 8:30 am before we start moving things around. Let me know if this is okay with everyone and I'll setup a zoom meeting


-Eugene



________________________________
From: Sebastian Kuhn <kuhn at jlab.org>
Sent: Tuesday, January 17, 2023 14:14
To: Eugene Pasyuk <pasyuk at jlab.org>
Cc: Probir Ghoshal <ghoshal at jlab.org>; Christopher Keith <ckeith at jlab.org>; Morgan Cook IV <mcookiv at jlab.org>; rgc at jlab.org <rgc at jlab.org>; Stepan Stepanyan <stepanya at jlab.org>; Patrick Achenbach <patricka at jlab.org>; Denny Insley <dinsley at jlab.org>; Raffaella De Vita <Raffaella.Devita at ge.infn.it>
Subject: Re: [Rgc] [EXTERNAL] Problem with FTCal

Dear all,

I would like to propose that we collect the following information: What tests are planned for the solenoid, and which of these can be done quickly BEFORE we move everything back again for the FT repair. Also, what is needed for these tests - I think it would be rather inefficient to use the polarized target as a magnetometer. We should still have the apparatus that used Hall probes to characterize the solenoid field - maybe it can be rigged in a way (fixed position) such that we can measure B vs. I in one place? Then we can try to organize the FT repair around this.

We may want to plan a quick RC meeting to discuss the options - I am available for the rest of the afternoon, and plan to be at JLab tomorrow (but 2 p.m. will have several conflicts, so it should be at 9 in the morning instead). Please let me know your availability/preferences.

- Sebastian

On Jan 17, 2023, at 2:08 PM, Eugene Pasyuk <pasyuk at jlab.org<mailto:pasyuk at jlab.org>> wrote:


EXTERNAL to ODU: This email is not from an ODU account. Do not click links or open attachments unless you recognize the sender and know the content is safe.

Probir,

We need your feedback hot this will affect the solenoid work if we start moving things around.

-Eugene

From: Christopher Keith <ckeith at jlab.org<mailto:ckeith at jlab.org>>
Sent: Tuesday, January 17, 2023 13:22
To: Christopher Keith <ckeith at jlab.org<mailto:ckeith at jlab.org>>
Cc: Morgan Cook IV <mcookiv at jlab.org<mailto:mcookiv at jlab.org>>; rgc at jlab.org<mailto:rgc at jlab.org>; Stepan Stepanyan <stepanya at jlab.org<mailto:stepanya at jlab.org>>; Eugene Pasyuk <pasyuk at jlab.org<mailto:pasyuk at jlab.org>>; Patrick Achenbach <patricka at jlab.org<mailto:patricka at jlab.org>>; Kuhn, Sebastian E. <skuhn at odu.edu<mailto:skuhn at odu.edu>>; Denny Insley <dinsley at jlab.org<mailto:dinsley at jlab.org>>; Raffaella De Vita <Raffaella.Devita at ge.infn.it<mailto:Raffaella.Devita at ge.infn.it>>; Probir Ghoshal <ghoshal at jlab.org<mailto:ghoshal at jlab.org>>
Subject: Re: [Rgc] [EXTERNAL] Problem with FTCal

Once the beam line is off, it takes a couple of hours to retract the target.  Inserting and aligning is 4+ hours.

Should we wait until the Magnet Group checks the linearity of the solenoid?  I just spoke with Probir, and he can confirm this with a Hall probe.

Chris


On Jan 17, 2023, at 1:11 PM, Christopher Keith via Rgc <rgc at jlab.org<mailto:rgc at jlab.org>> wrote:

I’d prefer not to cool the target to look for an NMR signal at 0.77 T, only to warm it and remove it afterwards.  Seeing the signal at that low field is not guaranteed, and it cause another delay of 2-3 day.  We should think of another way to check the linearity of solenoid.

Chris



On Jan 17, 2023, at 1:04 PM, Morgan Cook IV via Rgc <rgc at jlab.org<mailto:rgc at jlab.org>> wrote:

The HV cable probably got disconnected when I was arranging cabling and piping out of the cone of acceptance.

I'd say 3-4 days, depending on how long it takes to disconnect/reconnect the target and move it upstream/downstream. And I'm guessing that the solenoid work needs to take precedence... we're scheduled to cool down the target tomorrow in order to check the field... and I don't know how long that will take.

-Morgan
________________________________
From: Eugene Pasyuk <pasyuk at jlab.org<mailto:pasyuk at jlab.org>>
Sent: Tuesday, January 17, 2023 12:55 PM
To: silvia at jlab.org<mailto:silvia at jlab.org> <silvia at jlab.org<mailto:silvia at jlab.org>>; Raffaella De Vita <Raffaella.Devita at ge.infn.it<mailto:Raffaella.Devita at ge.infn.it>>
Cc: Kuhn, Sebastian E. <skuhn at odu.edu<mailto:skuhn at odu.edu>>; rgc at jlab.org<mailto:rgc at jlab.org> <rgc at jlab.org<mailto:rgc at jlab.org>>; Denny Insley <dinsley at jlab.org<mailto:dinsley at jlab.org>>; Morgan Cook IV <mcookiv at jlab.org<mailto:mcookiv at jlab.org>>; Patrick Achenbach <patricka at jlab.org<mailto:patricka at jlab.org>>; Stepan Stepanyan <stepanya at jlab.org<mailto:stepanya at jlab.org>>
Subject: RE: [EXTERNAL] Problem with FTCal


Getting to the detector will require breaking down the upstream beamline, taking the raster magnet off the target cart, moving the target upstream, moving CVT upstream, moving solenoid upstream, and moving HTCC. Then we will have to put everything back together and align it. This also may interfere with the solenoid work.

Denny, Morgan,  could you give an estimate of how long this work may take?

-Eugene

> -----Original Message-----
> From: silvia at jlab.org<mailto:silvia at jlab.org> <silvia at jlab.org<mailto:silvia at jlab.org>>
> Sent: Tuesday, January 17, 2023 12:42
> To: Raffaella De Vita <Raffaella.Devita at ge.infn.it<mailto:Raffaella.Devita at ge.infn.it>>
> Cc: Kuhn, Sebastian E. <skuhn at odu.edu<mailto:skuhn at odu.edu>>; rgc at jlab.org<mailto:rgc at jlab.org>; Eugene Pasyuk
> <pasyuk at jlab.org<mailto:pasyuk at jlab.org>>; Denny Insley <dinsley at jlab.org<mailto:dinsley at jlab.org>>; Morgan Cook IV
> <mcookiv at jlab.org<mailto:mcookiv at jlab.org>>
> Subject: Re: [EXTERNAL] Problem with FTCal
>
> Dear Raffaella and Eugene,
> when you say "a lot of work", do you have an estimate of how long trying to fix
> this issue would take? We still have roughly one week before the beam comes
> back. Giving up a priori to 1/4 of our data is a bit tough for me, especially given
> the lots of issues this experiment had until now, and the fact that we are not
> going to have an extension at the end of March.
> If you could please clarify what time scale we're talking about for the repairs, it
> would be very helpful to make our mind up.
> Thank you!
> Best regards,
> Silvia
>
>
> > Dear Sebastian and Silvia,
> >
> > Performing the final checkout on the FT, we found that we are not
> > getting useful signals from one quadrant of the calorimeter. You can
> > find more details in https://logbooks.jlab.org/entry/4111492<https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flogbooks.jlab.org%2Fentry%2F4111492&data=05%7C01%7Cskuhn%40odu.edu%7Cb81f84050f584333622c08daf8be32a4%7C48bf86e811a24b8a8cb368d8be2227f3%7C0%7C0%7C638095793018766897%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=efved59m5Uw8AbyyvlrvrQ%2FoWQU4pQyhlGEb9sY%2B2Xo%3D&reserved=0>
> > <https://logbooks.jlab.org/entry/4111492<https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flogbooks.jlab.org%2Fentry%2F4111492&data=05%7C01%7Cskuhn%40odu.edu%7Cb81f84050f584333622c08daf8be32a4%7C48bf86e811a24b8a8cb368d8be2227f3%7C0%7C0%7C638095793018766897%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=efved59m5Uw8AbyyvlrvrQ%2FoWQU4pQyhlGEb9sY%2B2Xo%3D&reserved=0>>.
> >
> > I am not sure when it happened but it is consistent with an HV cable
> > being disconnected on the detector side.
> >
> > Since fixing this requires having access to the detector, which is a
> > lot of work, Eugene asked me to inform you and ask you for feedback on
> > whether you would like to have this fixed or if you would accept
> > running with a missing quadrant.
> >
> > Best regards,
> >      Raffaella
>

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