[Rgc] [EXTERNAL] Problem with FTCal

[Eugene Pasyuk]

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 <silvia at jlab.org>
> Sent: Tuesday, January 17, 2023 12:42
> To: Raffaella De Vita <Raffaella.Devita at ge.infn.it>
> Cc: Kuhn, Sebastian E. <skuhn at odu.edu>; rgc at jlab.org; Eugene Pasyuk
> <pasyuk at jlab.org>; Denny Insley <dinsley at jlab.org>; Morgan Cook IV
> <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://logbooks.jlab.org/entry/4111492>.
> >
> > 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
>