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Hi Sourav,</div>
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Increasing the material budget of ToF barrel from 1% to 5% will worsen the angular resolutions further, particularly at lower momentum (below ~2 GeV). You can get a sense of this from slide 16:<a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__indico.bnl.gov_event_24221_contributions_94046_attachments_55823_95470_07-5F15-5F2024-5FDIRCAngleRes.pdf&d=DwMFAg&c=CJqEzB1piLOyyvZjb8YUQw&r=6nBhCQ9asnI7Gb72jBWQ4g&m=Mj1r_YPL42RgudYGHNdF6CbH5puVDEsvzBqqW9d7k0M_OqYf2oElqn356a1pGRe4&s=pCCfR_TnPS7XIj4UFEWxJ9Slr6wLxSDWUGTrkfLDihE&e=" id="LPlnk589764" class="OWAAutoLink">https://indico.bnl.gov/event/24221/contributions/94046/attachments/55823/95470/07_15_2024_DIRCAngleRes.pdf</a></div>
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looking at the change in cyan to green markers, you can see the effect of the central detector support cylinder, which has a material budget of 3.5%. You can also get a sense of the material impact from slides 25-26, where the uRWELL-BOT material was reduced
from 2% (black markers) to 1% (blue markers).</div>
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Unfortunately, right now I do not have the time to for a quick turn-around study on this. </div>
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Thanks,<br>
Matt</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 Sourav Tarafdar <stara@jlab.org><br>
<b>Sent:</b> Wednesday, July 17, 2024 9:55 AM<br>
<b>To:</b> erd108@jlab.org <erd108@jlab.org>; Shyam Kumar <shyam055119@gmail.com><br>
<b>Subject:</b> [External] [Erd108] Additional simulation request</font>
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Dear all ,</div>
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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. </div>
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Cheers,</div>
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Sourav</div>
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