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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Hi Rolf,
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Yes, the implicit assumption from my email is that if we move ahead with the E&D program as discussed at the meeting, the GEM-based
R&D effort (outer barrel and end cap disks) of eRD108 proposal is no longer needed. Only the Micromegas R&D effort of eRD108 support is needed.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Off course, so far, the discussion concentrated on the ePIC outer uRWELL tracker layers, but the challenges for the end cap disks are
identical. The prototyping of the end cap disks will be done as part of the same E&D effort and within the same timeline.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Regarding your point on small prototype to validate the concept of same mechanical support structure for the 3 options, I define<o:p></o:p></span></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo1"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Small prototypes
</span><span lang="EN-US" style="font-size:11.0pt;font-family:Wingdings;mso-fareast-language:EN-US">è</span><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"> active area ~ 10 x 10 cm)
<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo1"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Medium size (intermediary)
</span><span lang="EN-US" style="font-size:11.0pt;font-family:Wingdings;mso-fareast-language:EN-US">è</span><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"> active area ~50 cm x 34 cm<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo1"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Full size prototype
</span><span lang="EN-US" style="font-size:11.0pt;font-family:Wingdings;mso-fareast-language:EN-US">è</span><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"> active area ~170 cm x 34 cm<o:p></o:p></span></li></ol>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:-.25in;mso-list:l0 level1 lfo3"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">The mechanical support structure that was presented in the slides<b> has
already been tested and validated on small prototypes</b>. That is how we assembled the prototypes we tested in beam this summer from the generic R&D program<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:-.25in;mso-list:l0 level1 lfo3"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Prototyping medium size detector will not be useful because it will just
delay the program. The procurement of the uRWELL-RO PCB and GEM foils from CERN are the most time consuming part of the whole effort. So doubling the designs (medium and full size) will extend the procurement time.
<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:-.25in;mso-list:l0 level1 lfo3"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">The advantage I see in what is been proposed is that with the same design
(uRWELL-RO PCB and GEM foil) we could test all 3 options at the time and complete E&D program in the 2.5 years. Whether it is full size or medium size will not affect that timeline in any significant way. However only full size prototyping will allow us to
already design a prototype that is going to be close to the final ePIC detector <o:p>
</o:p></span></li></ul>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Best regards
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Kondo<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Rolf Ent <ent@jlab.org>
<br>
<b>Sent:</b> Wednesday, October 11, 2023 8:48 AM<br>
<b>To:</b> Kondo Gnanvo <kagnanvo@jlab.org>; Aschenauer, Elke <elke@bnl.gov>; Brian Eng <beng@jlab.org>; Francesco Bossu <francesco.bossu@cea.fr>; maxence.vandenbroucke <maxence.vandenbroucke@cea.fr>; Ernst Sichtermann <epsichtermann@lbl.gov>; Matthew Posik
<posik@temple.edu>; Lajoie, John G [PHYSA] <lajoie@iastate.edu>; Silvia Dalla Torre <silvia.dallatorre@cern.ch><br>
<b>Cc:</b> erd108@jlab.org<br>
<b>Subject:</b> Re: MPGD: The Path forward<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black">Dear Kondo, all,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black">I am sure Elke, John, Slvia and me will discuss more, but first order it seems we are on a path.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black">We will get back to you after our consultation.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black">I know I see Kondo next week anyway and can check then how to put the E&D concretely in<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black">motion with engineering help.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black">I do have one question that is a bit urgent, you say: "</span><span class="contentpasted0"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">In
addition, we are thinking of some very simple and straightforward ideas (see backup slides) to reinforce the overall mechanical structure of the detectors at no additional R&D cost and delay. "</span></span><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="contentpasted0"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">For the submitted eRD108 proposal, does this mean that we support the MicroMegas part and then for</span></span><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="contentpasted0"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">the GEM-based detectors expedite the E&D as described above? We had some discussion on making</span></span><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="contentpasted0"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">small prototypes to illustrate/prove we could change between standard, thin-gap, hybrid. Is that still</span></span><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="contentpasted0"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">relevant or does your reply mean we can check that from ongoing efforts? The reply is ambiguous.</span></span><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span class="contentpasted0"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">Let me know as Thomas/Elke/me have the DAC report on R&D so need to finalize planning.</span></span><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span class="contentpasted0"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">Best regards, Rolf</span></span><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> Kondo Gnanvo <<a href="mailto:kagnanvo@jlab.org">kagnanvo@jlab.org</a>><br>
<b>Sent:</b> Wednesday, October 11, 2023 8:03 AM<br>
<b>To:</b> Rolf Ent <<a href="mailto:ent@jlab.org">ent@jlab.org</a>>; Aschenauer, Elke <<a href="mailto:elke@bnl.gov">elke@bnl.gov</a>>; Brian Eng <<a href="mailto:beng@jlab.org">beng@jlab.org</a>>; Francesco Bossu <<a href="mailto:francesco.bossu@cea.fr">francesco.bossu@cea.fr</a>>;
maxence.vandenbroucke <<a href="mailto:maxence.vandenbroucke@cea.fr">maxence.vandenbroucke@cea.fr</a>>; Ernst Sichtermann <<a href="mailto:epsichtermann@lbl.gov">epsichtermann@lbl.gov</a>>; Matthew Posik <<a href="mailto:posik@temple.edu">posik@temple.edu</a>>;
Lajoie, John G [PHYSA] <<a href="mailto:lajoie@iastate.edu">lajoie@iastate.edu</a>>; Silvia Dalla Torre <<a href="mailto:silvia.dallatorre@cern.ch">silvia.dallatorre@cern.ch</a>><br>
<b>Cc:</b> <a href="mailto:erd108@jlab.org">erd108@jlab.org</a> <<a href="mailto:erd108@jlab.org">erd108@jlab.org</a>><br>
<b>Subject:</b> RE: MPGD: The Path forward</span> <o:p></o:p></p>
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<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">Dear Rolf, Elke, Silvia, John
</span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">Thanks for the summary of the Outer uRWELL tracker meeting and the very productive discussion on the option and path forward.
</span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">We had a follow up discussion on the matter at our eRD108 meeting.
</span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">We agree that the suggestion / recommendation to start a parallel E&D effort that focused on the “common” mechanical structure design for 3 prototypes (standard
3 mm gap, single amplification thin gap and hybrid amplification thin gap) is the best approach and would not result in additional delay as it maintains the standard 3 mm gap uRWELL as a reference (i.e. backup solution) that would not require additional E&D.
</span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">To illustrate why we are confident that hybrid thin-gap is compatible with the mechanical support structure of a standard gap uRWELL, I prepared a few slides
witj the cartoon cross sectional views of the 3 detector options showing a breakdown of the different elements of the mechanical support.
</span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">You could see that with this design, when going from single amplification to hybrid amplification with GEM, the only additional elements are the GEM foil and
the induction gap frame. But most importantly, the “cathode block” is used as support structure of the GEM during the assembly (stretching and gluing) and is strong enough to sustain the tension of the stretched GEM foil (which is the only stretched foil).
</span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">The uRWELL-RO block which remain the same all 3 designs, will also help maintain further the tension of the stretched GEM foil in the hybrid thin gap case</span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">In addition, we are thinking of some very simple and straightforward ideas (see backup slides) to reinforce the overall mechanical structure of the detectors
at no additional R&D cost and delay. </span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">If this slides help clarifies some of the concerns regarding the hybrid options and you are ok with the approach, then we are ready to start follow up meetings
on specific mechanical support design. </span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">Best regards
</span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">Kondo
</span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span><o:p></o:p></p>
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<p class="xmsonormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Rolf Ent <<a href="mailto:ent@jlab.org">ent@jlab.org</a>>
<br>
<b>Sent:</b> Monday, October 2, 2023 10:38 AM<br>
<b>To:</b> Aschenauer, Elke <<a href="mailto:elke@bnl.gov">elke@bnl.gov</a>>; Brian Eng <<a href="mailto:beng@jlab.org">beng@jlab.org</a>>; Kondo Gnanvo <<a href="mailto:kagnanvo@jlab.org">kagnanvo@jlab.org</a>>; Francesco Bossu <<a href="mailto:francesco.bossu@cea.fr">francesco.bossu@cea.fr</a>>;
maxence.vandenbroucke <<a href="mailto:maxence.vandenbroucke@cea.fr">maxence.vandenbroucke@cea.fr</a>>; Ernst Sichtermann <<a href="mailto:epsichtermann@lbl.gov">epsichtermann@lbl.gov</a>>; Matthew Posik <<a href="mailto:posik@temple.edu">posik@temple.edu</a>>;
Lajoie, John G [PHYSA] <<a href="mailto:lajoie@iastate.edu">lajoie@iastate.edu</a>>; Silvia Dalla Torre <<a href="mailto:silvia.dallatorre@cern.ch">silvia.dallatorre@cern.ch</a>><br>
<b>Subject:</b> Re: MPGD: The Path forward</span><o:p></o:p></p>
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<p class="xmsonormal"> <o:p></o:p></p>
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<p class="xmsonormal"><span style="font-family:"Calibri",sans-serif;color:black">Dear all,</span><o:p></o:p></p>
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<p class="xmsonormal"><span style="font-family:"Calibri",sans-serif;color:black"> </span><o:p></o:p></p>
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<p class="xmsonormal"><span style="font-family:"Calibri",sans-serif;color:black">attached a summary of the MPGD: Path Forward meeting that we had in last week's Thursday</span><o:p></o:p></p>
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<p class="xmsonormal"><span style="font-family:"Calibri",sans-serif;color:black">tracking WG slot. It folds in comments by Elke, Silvia and me, and a question John had. There</span><o:p></o:p></p>
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<p class="xmsonormal"><span style="font-family:"Calibri",sans-serif;color:black">are some action items. Hopefully we can soon have a follow-up as we have to get this in motion.</span><o:p></o:p></p>
</div>
<div>
<p class="xmsonormal"><span style="font-family:"Calibri",sans-serif;color:black"> </span><o:p></o:p></p>
</div>
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<p class="xmsonormal"><span style="font-family:"Calibri",sans-serif;color:black">Thanks to all for the constructive (long) meeting last Thursday.</span><o:p></o:p></p>
</div>
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<p class="xmsonormal"><span style="font-family:"Calibri",sans-serif;color:black"> </span><o:p></o:p></p>
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<p class="xmsonormal"><span style="font-family:"Calibri",sans-serif;color:black">Best regards, Rolf</span><o:p></o:p></p>
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<p class="xmsonormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> Aschenauer, Elke <<a href="mailto:elke@bnl.gov">elke@bnl.gov</a>><br>
<b>Sent:</b> Wednesday, September 20, 2023 5:38 AM<br>
<b>To:</b> Brian Eng <<a href="mailto:beng@jlab.org">beng@jlab.org</a>>; Kondo Gnanvo <<a href="mailto:kagnanvo@jlab.org">kagnanvo@jlab.org</a>>; Francesco Bossu <<a href="mailto:francesco.bossu@cea.fr">francesco.bossu@cea.fr</a>>; maxence.vandenbroucke <<a href="mailto:maxence.vandenbroucke@cea.fr">maxence.vandenbroucke@cea.fr</a>>;
Rolf Ent <<a href="mailto:ent@jlab.org">ent@jlab.org</a>>; Ernst Sichtermann <<a href="mailto:epsichtermann@lbl.gov">epsichtermann@lbl.gov</a>>; Matthew Posik <<a href="mailto:posik@temple.edu">posik@temple.edu</a>>; Lajoie, John G [PHYSA] <<a href="mailto:lajoie@iastate.edu">lajoie@iastate.edu</a>>;
Silvia Dalla Torre <<a href="mailto:silvia.dallatorre@cern.ch">silvia.dallatorre@cern.ch</a>>; Aschenauer, Elke <<a href="mailto:elke@bnl.gov">elke@bnl.gov</a>><br>
<b>Subject:</b> [EXTERNAL] MPGD: The Path forward</span> <o:p></o:p></p>
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<p class="xmsonormal"> <o:p></o:p></p>
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<p class="xxmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">Dear All,</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="xxmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">As we discussed last Thursday we would like to meet again on Thursday 11:00 am 28th of September (assuming there is no tracking WG meeting scheduled at that
time). To begin with, we would like to thank the presenters at last Monday’s TIC meeting for the progress they have already made folding in the discussion from last Thursday’s meeting.
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="xxmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="xxmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">Based on the excellent information we have received so far, we would like to define a path forward as preparation for our next meeting. To that end we are circulating
the following questions/discussion points. One base assumption that we will make is that heavy gases, i.e. Xe and Kr are available at the time EIC is operating. Based on this assumption we would like to understand:
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="xxmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">1. What R&D needs still to be finalized to show that the Standard ėRWell (as discussed on slide 5 of Kondo’s TIC presentation, leftmost column) provides an
option for an MPGD tracker for ePIC even if the hit resolution is inadequate. We would also like to see a time estimate needed to complete this R&D.</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="xxmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">2. What
<u>additional</u> R&D is needed to make a thin-gap ėRWell (as discussed on slide 5 of Kondo’s TIC presentation, 2nd column from the left) an option for an MPGD tracker for ePIC. We want also would like to see a time estimate needed to complete the R&D for a
full-size thin-gap ėRWell prototype. Again, we note that this should assume the availability of heavy noble gases and the gas should be chose to optimize the stability of the detector.
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="xxmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="xxmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">While the hybrid GEM/uRWell may have applications in future detectors, the additional R&D required is inconsistent with the project timeline and introduces too
much risk. The hybrid designs are not an option for ePIC. </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="xxmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="xxmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">In parallel to developing the requested information about remaining R&D, Matt Posik’s simulation studies should be pursued because they will guide how small
the ėRWell gap needs to be, i.e., maybe can one live with a drift gap of 2mm instead of 1mm. It will be important to make the two methods of determining the angular resolution at the hpDIRC converge in the simulation studies so we can have some confidence
in the results. The Astropix hits should also be included in these simulation studies, and any remaining issues in defining the MC “truth” hit position in the hpDIRC resolved.
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="xxmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">With this parallel approach we believe the discussion boils down to a single parameter – the size of the drift gap in the ėRWell. The simulation studies will
set this by determining the required spatial resolution, and an understanding of the remaining R&D and how that depends on the size of the drift gap will inform the plan to develop the outer MPGD for ePIC.
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="xxmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">Thanks,
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="xxmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">John, Silvia, Rolf and Elke</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="xxmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="xxmsonormal"><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:black"> </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> Kondo Gnanvo <<a href="mailto:kagnanvo@jlab.org">kagnanvo@jlab.org</a>><br>
<b>Sent:</b> Wednesday, October 11, 2023 8:03 AM<br>
<b>To:</b> Rolf Ent <<a href="mailto:ent@jlab.org">ent@jlab.org</a>>; Aschenauer, Elke <<a href="mailto:elke@bnl.gov">elke@bnl.gov</a>>; Brian Eng <<a href="mailto:beng@jlab.org">beng@jlab.org</a>>; Francesco Bossu <<a href="mailto:francesco.bossu@cea.fr">francesco.bossu@cea.fr</a>>;
maxence.vandenbroucke <<a href="mailto:maxence.vandenbroucke@cea.fr">maxence.vandenbroucke@cea.fr</a>>; Ernst Sichtermann <<a href="mailto:epsichtermann@lbl.gov">epsichtermann@lbl.gov</a>>; Matthew Posik <<a href="mailto:posik@temple.edu">posik@temple.edu</a>>;
Lajoie, John G [PHYSA] <<a href="mailto:lajoie@iastate.edu">lajoie@iastate.edu</a>>; Silvia Dalla Torre <<a href="mailto:silvia.dallatorre@cern.ch">silvia.dallatorre@cern.ch</a>><br>
<b>Cc:</b> <a href="mailto:erd108@jlab.org">erd108@jlab.org</a> <<a href="mailto:erd108@jlab.org">erd108@jlab.org</a>><br>
<b>Subject:</b> RE: MPGD: The Path forward</span> <o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">Dear Rolf, Elke, Silvia, John
</span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">Thanks for the summary of the Outer uRWELL tracker meeting and the very productive discussion on the option and path forward.
</span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">We had a follow up discussion on the matter at our eRD108 meeting.
</span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">We agree that the suggestion / recommendation to start a parallel E&D effort that focused on the “common” mechanical structure design for 3 prototypes (standard
3 mm gap, single amplification thin gap and hybrid amplification thin gap) is the best approach and would not result in additional delay as it maintains the standard 3 mm gap uRWELL as a reference (i.e. backup solution) that would not require additional E&D.
</span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">To illustrate why we are confident that hybrid thin-gap is compatible with the mechanical support structure of a standard gap uRWELL, I prepared a few slides
witj the cartoon cross sectional views of the 3 detector options showing a breakdown of the different elements of the mechanical support.
</span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">You could see that with this design, when going from single amplification to hybrid amplification with GEM, the only additional elements are the GEM foil and
the induction gap frame. But most importantly, the “cathode block” is used as support structure of the GEM during the assembly (stretching and gluing) and is strong enough to sustain the tension of the stretched GEM foil (which is the only stretched foil).
</span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">The uRWELL-RO block which remain the same all 3 designs, will also help maintain further the tension of the stretched GEM foil in the hybrid thin gap case</span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">In addition, we are thinking of some very simple and straightforward ideas (see backup slides) to reinforce the overall mechanical structure of the detectors
at no additional R&D cost and delay. </span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">If this slides help clarifies some of the concerns regarding the hybrid options and you are ok with the approach, then we are ready to start follow up meetings
on specific mechanical support design. </span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">Best regards
</span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">Kondo
</span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span><o:p></o:p></p>
<p class="xmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span><o:p></o:p></p>
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<p class="xmsonormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Rolf Ent <<a href="mailto:ent@jlab.org">ent@jlab.org</a>>
<br>
<b>Sent:</b> Monday, October 2, 2023 10:38 AM<br>
<b>To:</b> Aschenauer, Elke <<a href="mailto:elke@bnl.gov">elke@bnl.gov</a>>; Brian Eng <<a href="mailto:beng@jlab.org">beng@jlab.org</a>>; Kondo Gnanvo <<a href="mailto:kagnanvo@jlab.org">kagnanvo@jlab.org</a>>; Francesco Bossu <<a href="mailto:francesco.bossu@cea.fr">francesco.bossu@cea.fr</a>>;
maxence.vandenbroucke <<a href="mailto:maxence.vandenbroucke@cea.fr">maxence.vandenbroucke@cea.fr</a>>; Ernst Sichtermann <<a href="mailto:epsichtermann@lbl.gov">epsichtermann@lbl.gov</a>>; Matthew Posik <<a href="mailto:posik@temple.edu">posik@temple.edu</a>>;
Lajoie, John G [PHYSA] <<a href="mailto:lajoie@iastate.edu">lajoie@iastate.edu</a>>; Silvia Dalla Torre <<a href="mailto:silvia.dallatorre@cern.ch">silvia.dallatorre@cern.ch</a>><br>
<b>Subject:</b> Re: MPGD: The Path forward</span><o:p></o:p></p>
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<p class="xmsonormal"> <o:p></o:p></p>
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<p class="xmsonormal"><span style="font-family:"Calibri",sans-serif;color:black">Dear all,</span><o:p></o:p></p>
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<p class="xmsonormal"><span style="font-family:"Calibri",sans-serif;color:black"> </span><o:p></o:p></p>
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<p class="xmsonormal"><span style="font-family:"Calibri",sans-serif;color:black">attached a summary of the MPGD: Path Forward meeting that we had in last week's Thursday</span><o:p></o:p></p>
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<p class="xmsonormal"><span style="font-family:"Calibri",sans-serif;color:black">tracking WG slot. It folds in comments by Elke, Silvia and me, and a question John had. There</span><o:p></o:p></p>
</div>
<div>
<p class="xmsonormal"><span style="font-family:"Calibri",sans-serif;color:black">are some action items. Hopefully we can soon have a follow-up as we have to get this in motion.</span><o:p></o:p></p>
</div>
<div>
<p class="xmsonormal"><span style="font-family:"Calibri",sans-serif;color:black"> </span><o:p></o:p></p>
</div>
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<p class="xmsonormal"><span style="font-family:"Calibri",sans-serif;color:black">Thanks to all for the constructive (long) meeting last Thursday.</span><o:p></o:p></p>
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<p class="xmsonormal"><span style="font-family:"Calibri",sans-serif;color:black"> </span><o:p></o:p></p>
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<p class="xmsonormal"><span style="font-family:"Calibri",sans-serif;color:black">Best regards, Rolf</span><o:p></o:p></p>
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<p class="xmsonormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> Aschenauer, Elke <<a href="mailto:elke@bnl.gov">elke@bnl.gov</a>><br>
<b>Sent:</b> Wednesday, September 20, 2023 5:38 AM<br>
<b>To:</b> Brian Eng <<a href="mailto:beng@jlab.org">beng@jlab.org</a>>; Kondo Gnanvo <<a href="mailto:kagnanvo@jlab.org">kagnanvo@jlab.org</a>>; Francesco Bossu <<a href="mailto:francesco.bossu@cea.fr">francesco.bossu@cea.fr</a>>; maxence.vandenbroucke <<a href="mailto:maxence.vandenbroucke@cea.fr">maxence.vandenbroucke@cea.fr</a>>;
Rolf Ent <<a href="mailto:ent@jlab.org">ent@jlab.org</a>>; Ernst Sichtermann <<a href="mailto:epsichtermann@lbl.gov">epsichtermann@lbl.gov</a>>; Matthew Posik <<a href="mailto:posik@temple.edu">posik@temple.edu</a>>; Lajoie, John G [PHYSA] <<a href="mailto:lajoie@iastate.edu">lajoie@iastate.edu</a>>;
Silvia Dalla Torre <<a href="mailto:silvia.dallatorre@cern.ch">silvia.dallatorre@cern.ch</a>>; Aschenauer, Elke <<a href="mailto:elke@bnl.gov">elke@bnl.gov</a>><br>
<b>Subject:</b> [EXTERNAL] MPGD: The Path forward</span> <o:p></o:p></p>
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<p class="xxmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">Dear All,</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="xxmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">As we discussed last Thursday we would like to meet again on Thursday 11:00 am 28th of September (assuming there is no tracking WG meeting scheduled at that
time). To begin with, we would like to thank the presenters at last Monday’s TIC meeting for the progress they have already made folding in the discussion from last Thursday’s meeting.
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="xxmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="xxmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">Based on the excellent information we have received so far, we would like to define a path forward as preparation for our next meeting. To that end we are circulating
the following questions/discussion points. One base assumption that we will make is that heavy gases, i.e. Xe and Kr are available at the time EIC is operating. Based on this assumption we would like to understand:
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="xxmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">1. What R&D needs still to be finalized to show that the Standard ėRWell (as discussed on slide 5 of Kondo’s TIC presentation, leftmost column) provides an
option for an MPGD tracker for ePIC even if the hit resolution is inadequate. We would also like to see a time estimate needed to complete this R&D.</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="xxmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">2. What
<u>additional</u> R&D is needed to make a thin-gap ėRWell (as discussed on slide 5 of Kondo’s TIC presentation, 2nd column from the left) an option for an MPGD tracker for ePIC. We want also would like to see a time estimate needed to complete the R&D for a
full-size thin-gap ėRWell prototype. Again, we note that this should assume the availability of heavy noble gases and the gas should be chose to optimize the stability of the detector.
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<p class="xxmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="xxmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">While the hybrid GEM/uRWell may have applications in future detectors, the additional R&D required is inconsistent with the project timeline and introduces too
much risk. The hybrid designs are not an option for ePIC. </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="xxmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="xxmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">In parallel to developing the requested information about remaining R&D, Matt Posik’s simulation studies should be pursued because they will guide how small
the ėRWell gap needs to be, i.e., maybe can one live with a drift gap of 2mm instead of 1mm. It will be important to make the two methods of determining the angular resolution at the hpDIRC converge in the simulation studies so we can have some confidence
in the results. The Astropix hits should also be included in these simulation studies, and any remaining issues in defining the MC “truth” hit position in the hpDIRC resolved.
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="xxmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">With this parallel approach we believe the discussion boils down to a single parameter – the size of the drift gap in the ėRWell. The simulation studies will
set this by determining the required spatial resolution, and an understanding of the remaining R&D and how that depends on the size of the drift gap will inform the plan to develop the outer MPGD for ePIC.
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="xxmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">Thanks,
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="xxmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">John, Silvia, Rolf and Elke</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="xxmsonormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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