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Hi All,</div>
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Kondo is correct, the MPGD resolution does not help DIRC PID due to multiple scattering of the inner layers, even when the MPGD resolution is 50um. Adding the CF support just worsens the resolutions. Additional material will further worsen the angular performance.</div>
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Thanks,</div>
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Matt</div>
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Matt Posik</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Erd108 <erd108-bounces@jlab.org> on behalf of Kondo Gnanvo <kagnanvo@jlab.org><br>
<b>Sent:</b> Wednesday, July 17, 2024 10:39 AM<br>
<b>To:</b> Sourav Tarafdar <stara@jlab.org>; Gnanvo, Kondo (kg6cq) <kg6cq@virginia.edu>; erd108@jlab.org <erd108@jlab.org>; Shyam Kumar <shyam055119@gmail.com><br>
<b>Subject:</b> [External] Re: [Erd108] Additional simulation request</font>
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<div dir="ltr">Hi Sourav </div>
<div dir="ltr">Ok, i will let Matt comment. My main point is whether good spatial resolution MPGD helps achieving the angular resolution requirements at the DIRC. It looks like even before including the CF material, we could not satisfy this requirement even
with a 50um MPGD, so </div>
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<ul data-editing-info="{"orderedStyleType":1,"unorderedStyleType":2}" style="margin-top:0px; margin-bottom:0px">
<li style="list-style-type:"- ""><span>MPGD resolution does not help because multiple scattering of the inner layers is dominant factor</span></li><li style="list-style-type:"- ""><span>0.5 mrad angular resolution requirements not met even before considering CF support structure </span></li></ul>
<div dir="ltr">Maybe I am wrong though! </div>
<div dir="ltr">Best regards </div>
<div dir="ltr">Kondo</div>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Sourav Tarafdar <stara@jlab.org><br>
<b>Sent:</b> Wednesday, July 17, 2024 10:27:32 AM<br>
<b>To:</b> Kondo Gnanvo <kagnanvo@jlab.org>; Gnanvo, Kondo (kg6cq) <kg6cq@virginia.edu>; erd108@jlab.org <erd108@jlab.org>; Shyam Kumar <shyam055119@gmail.com><br>
<b>Subject:</b> Re: Additional simulation request</font>
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Hi Kondo,</div>
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Just during Monday simulation meeting Matt showed series of studies. Slide 15 in Matt's presentation concludes the effect of CF affects the angular resolution significantly, if I am not mistaken in final conclusion during that presentation ? </div>
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Regards,</div>
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Sourav </div>
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<div id="x_x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Erd108 <erd108-bounces@jlab.org> on behalf of Kondo Gnanvo <kagnanvo@jlab.org><br>
<b>Sent:</b> Wednesday, July 17, 2024 10:23 AM<br>
<b>To:</b> Sourav Tarafdar <stara@jlab.org>; Gnanvo, Kondo (kg6cq) <kg6cq@virginia.edu>; erd108@jlab.org <erd108@jlab.org>; Shyam Kumar <shyam055119@gmail.com><br>
<b>Subject:</b> Re: [Erd108] Additional simulation request</font>
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<div dir="ltr">Hi Sourav, </div>
<div dir="ltr">The spatial resolution was already irrelevant even before considering the CF material if i remember well from past studies. </div>
<div dir="ltr">I don’t remember a simulation study that ever show any impact of MPGD resolution on the angular resolution at the DIRC level </div>
<div dir="ltr">Best regards </div>
<div dir="ltr">Kondo </div>
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<div id="x_x_x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Erd108 <erd108-bounces@jlab.org> on behalf of Sourav Tarafdar <stara@jlab.org><br>
<b>Sent:</b> Wednesday, July 17, 2024 10:11:36 AM<br>
<b>To:</b> Gnanvo, Kondo (kg6cq) <kg6cq@virginia.edu>; erd108@jlab.org <erd108@jlab.org>; Shyam Kumar <shyam055119@gmail.com><br>
<b>Subject:</b> Re: [Erd108] Additional simulation request</font>
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Hi Kondo,</div>
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I thought it was 3% Carbon fiber support structure causing multiple scattering which was basically making spatial resolution of MPGD irrelevant ?</div>
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Regards,</div>
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Sourav</div>
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<div id="x_x_x_x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Gnanvo, Kondo (kg6cq) <kg6cq@virginia.edu><br>
<b>Sent:</b> Wednesday, July 17, 2024 10:07 AM<br>
<b>To:</b> Sourav Tarafdar <stara@jlab.org>; erd108@jlab.org <erd108@jlab.org>; Shyam Kumar <shyam055119@gmail.com><br>
<b>Subject:</b> [EXTERNAL] RE: Additional simulation request</font>
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<p class="x_x_x_x_x_MsoNormal">Hi Sourav, </p>
<p class="x_x_x_x_x_MsoNormal">It looks like the material budget already the dominant parameter for the angular resolution study at the DIRC level so it seems very unlikely that there would be any difference between 1% and 5% for the TOF layer</p>
<p class="x_x_x_x_x_MsoNormal">Best regards </p>
<p class="x_x_x_x_x_MsoNormal">Kondo</p>
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<p class="x_x_x_x_x_MsoNormal"><b>From:</b> Erd108 <erd108-bounces@jlab.org> <b>On Behalf Of
</b>Sourav Tarafdar<br>
<b>Sent:</b> Wednesday, July 17, 2024 9:55 AM<br>
<b>To:</b> erd108@jlab.org; Shyam Kumar <shyam055119@gmail.com><br>
<b>Subject:</b> [Erd108] Additional simulation request</p>
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<p class="x_x_x_x_x_MsoNormal"><span style="font-size:12.0pt; color:black">Dear all ,</span></p>
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<p class="x_x_x_x_x_MsoNormal"><span style="font-size:12.0pt; color:black">The request is mostly directed towards Matt and Shyam. I am wondering if it is possible to quickly do additional study on angular resolution @ DIRC location by increasing the material
budget of barrel ToF from current 1.0% to 5.0% ? There has been chatter about increasing the material budget of ToF to 5.0% and before it takes a lead it will be good to know it's effect . Based on results shown in the Monday meeting I suppose it will further
deteriorate angular resolution at DIRC. Also considering Shyam's method I think the analytical simulation method by Shyam will be good enough if DD4HEP sim is time taking. </span></p>
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<p class="x_x_x_x_x_MsoNormal"><span style="font-size:12.0pt; color:black">Cheers,</span></p>
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<p class="x_x_x_x_x_MsoNormal"><span style="font-size:12.0pt; color:black">Sourav</span></p>
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