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<p class="MsoNormal">Probir,<o:p></o:p></p>
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<p class="MsoNormal">We need your feedback hot this will affect the solenoid work if we start moving things around.<o:p></o:p></p>
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<p class="MsoNormal">-Eugene<o:p></o:p></p>
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<p class="MsoNormal"><b>From:</b> Christopher Keith <ckeith@jlab.org> <br>
<b>Sent:</b> Tuesday, January 17, 2023 13:22<br>
<b>To:</b> Christopher Keith <ckeith@jlab.org><br>
<b>Cc:</b> Morgan Cook IV <mcookiv@jlab.org>; rgc@jlab.org; Stepan Stepanyan <stepanya@jlab.org>; Eugene Pasyuk <pasyuk@jlab.org>; Patrick Achenbach <patricka@jlab.org>; Kuhn, Sebastian E. <skuhn@odu.edu>; Denny Insley <dinsley@jlab.org>; Raffaella De Vita
<Raffaella.Devita@ge.infn.it>; Probir Ghoshal <ghoshal@jlab.org><br>
<b>Subject:</b> Re: [Rgc] [EXTERNAL] Problem with FTCal<o:p></o:p></p>
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<p class="MsoNormal">Once the beam line is off, it takes a couple of hours to retract the target. Inserting and aligning is 4+ hours.<o:p></o:p></p>
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<p class="MsoNormal">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.<o:p></o:p></p>
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<p class="MsoNormal">Chris<o:p></o:p></p>
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<p class="MsoNormal">On Jan 17, 2023, at 1:11 PM, Christopher Keith via Rgc <<a href="mailto:rgc@jlab.org">rgc@jlab.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">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. <o:p></o:p></p>
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<p class="MsoNormal">Chris<o:p></o:p></p>
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<p class="MsoNormal">On Jan 17, 2023, at 1:04 PM, Morgan Cook IV via Rgc <<a href="mailto:rgc@jlab.org">rgc@jlab.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black;background:white">The HV cable probably got disconnected when I was arranging<span class="apple-converted-space"> </span></span><span style="font-size:10.5pt;color:black;background:white">cabling</span><span style="font-size:12.0pt;color:black;background:white"> and
piping out of the cone of acceptance. </span><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black;background:white">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.</span><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black;background:white">-Morgan</span><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><b>From:</b><span class="apple-converted-space"> </span>Eugene Pasyuk <<a href="mailto:pasyuk@jlab.org">pasyuk@jlab.org</a>><br>
<b>Sent:</b><span class="apple-converted-space"> </span>Tuesday, January 17, 2023 12:55 PM<br>
<b>To:</b><span class="apple-converted-space"> </span><a href="mailto:silvia@jlab.org">silvia@jlab.org</a> <<a href="mailto:silvia@jlab.org">silvia@jlab.org</a>>; Raffaella De Vita <<a href="mailto:Raffaella.Devita@ge.infn.it">Raffaella.Devita@ge.infn.it</a>><br>
<b>Cc:</b><span class="apple-converted-space"> </span>Kuhn, Sebastian E. <<a href="mailto:skuhn@odu.edu">skuhn@odu.edu</a>>;
<a href="mailto:rgc@jlab.org">rgc@jlab.org</a> <<a href="mailto:rgc@jlab.org">rgc@jlab.org</a>>; Denny Insley <<a href="mailto:dinsley@jlab.org">dinsley@jlab.org</a>>; Morgan Cook IV <<a href="mailto:mcookiv@jlab.org">mcookiv@jlab.org</a>>; Patrick Achenbach
<<a href="mailto:patricka@jlab.org">patricka@jlab.org</a>>; Stepan Stepanyan <<a href="mailto:stepanya@jlab.org">stepanya@jlab.org</a>><br>
<b>Subject:</b><span class="apple-converted-space"> </span>RE: [EXTERNAL] Problem with FTCal<span style="font-size:10.5pt;font-family:"Helvetica",sans-serif">
<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-family:"Helvetica",sans-serif">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.<br>
<br>
Denny, Morgan, could you give an estimate of how long this work may take?<br>
<br>
-Eugene<br>
<br>
> -----Original Message-----<br>
> From: <a href="mailto:silvia@jlab.org">silvia@jlab.org</a> <<a href="mailto:silvia@jlab.org">silvia@jlab.org</a>><br>
> Sent: Tuesday, January 17, 2023 12:42<br>
> To: Raffaella De Vita <<a href="mailto:Raffaella.Devita@ge.infn.it">Raffaella.Devita@ge.infn.it</a>><br>
> Cc: Kuhn, Sebastian E. <<a href="mailto:skuhn@odu.edu">skuhn@odu.edu</a>>; <a href="mailto:rgc@jlab.org">
rgc@jlab.org</a>; Eugene Pasyuk<br>
> <<a href="mailto:pasyuk@jlab.org">pasyuk@jlab.org</a>>; Denny Insley <<a href="mailto:dinsley@jlab.org">dinsley@jlab.org</a>>; Morgan Cook IV<br>
> <<a href="mailto:mcookiv@jlab.org">mcookiv@jlab.org</a>><br>
> Subject: Re: [EXTERNAL] Problem with FTCal<br>
><span class="apple-converted-space"> </span><br>
> Dear Raffaella and Eugene,<br>
> when you say "a lot of work", do you have an estimate of how long trying to fix<br>
> this issue would take? We still have roughly one week before the beam comes<br>
> back. Giving up a priori to 1/4 of our data is a bit tough for me, especially given<br>
> the lots of issues this experiment had until now, and the fact that we are not<br>
> going to have an extension at the end of March.<br>
> If you could please clarify what time scale we're talking about for the repairs, it<br>
> would be very helpful to make our mind up.<br>
> Thank you!<br>
> Best regards,<br>
> Silvia<br>
><span class="apple-converted-space"> </span><br>
><span class="apple-converted-space"> </span><br>
> > Dear Sebastian and Silvia,<br>
> ><br>
> > Performing the final checkout on the FT, we found that we are not<br>
> > getting useful signals from one quadrant of the calorimeter. You can<br>
> > find more details in<span class="apple-converted-space"> </span><a href="https://logbooks.jlab.org/entry/4111492">https://logbooks.jlab.org/entry/4111492</a><br>
> > <<a href="https://logbooks.jlab.org/entry/4111492">https://logbooks.jlab.org/entry/4111492</a>>.<br>
> ><br>
> > I am not sure when it happened but it is consistent with an HV cable<br>
> > being disconnected on the detector side.<br>
> ><br>
> > Since fixing this requires having access to the detector, which is a<br>
> > lot of work, Eugene asked me to inform you and ask you for feedback on<br>
> > whether you would like to have this fixed or if you would accept<br>
> > running with a missing quadrant.<br>
> ><br>
> > Best regards,<br>
> > Raffaella<br>
><span class="apple-converted-space"> </span><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif">_______________________________________________<br>
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<p class="MsoNormal">_______________________________________________<br>
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