<div dir="ltr"><div class="gmail_default" style="color:rgb(0,0,0)"><font face="times new roman, serif" size="4">Dear All,</font></div><div class="gmail_default" style="color:rgb(0,0,0)"><font face="times new roman, serif" size="4">Below some comments concerning the coil insulation lifetime.</font></div><div class="gmail_default" style="color:rgb(0,0,0)"><font face="times new roman, serif" size="4"> In the conceptual design we "utilize" 1.5T*3m magnet.</font></div><div class="gmail_default" style="color:rgb(0,0,0)"><font face="times new roman, serif" size="4"><br></font></div><div class="gmail_default" style="color:rgb(0,0,0)"><font face="times new roman, serif" size="4"> Since we need only 1/5 of its maximum field we may reduce the winding density</font></div><div class="gmail_default" style="color:rgb(0,0,0)"><font face="times new roman, serif" size="4">in such a way that we'll have say 3-5 mm distance between wires in coils. </font></div><div class="gmail_default" style="color:rgb(0,0,0)"><font face="times new roman, serif" size="4"> In such a case only straight portions of winding, parallel to the beam axis, need to be insulated; the curved "return" portions will be "naked", thus insulated by an air gap of 3-5 mm, with some ceramic spacer in between to prevent touching. </font></div><div class="gmail_default" style="color:rgb(0,0,0)"><font face="times new roman, serif" size="4"> Therefore, although the "return" part is exposed to significantly higher radiation, it does not affect the insulation lifetime</font></div><div class="gmail_default" style="color:rgb(0,0,0)"><font face="times new roman, serif" size="4"> That's why only straight parts of windings were addressed in my estimations of insulation lifetime, which is 1160 days for kapton and 5500 days for the fiberglass material.</font></div><div class="gmail_default" style="color:rgb(0,0,0)"><font face="times new roman, serif" size="4"> Sorry for confusion.</font></div><div class="gmail_default" style="font-size:large;color:#000000"><br></div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr">----------------------</div><div dir="ltr">Dr. Vitaly Baturin,</div><div dir="ltr">OCNPS 2103A, Old Dominion University,<br>4600 Elkhorn Ave, Norfolk, </div><div dir="ltr">VA 23529 USA.</div><div dir="ltr">757 633 5669</div><div dir="ltr"><br></div><div dir="ltr">----------------------<br>Off: (757) 683 5807</div></div><div>Mob: (757) 633 5669</div><div>Skype: vitaly.baturin</div></div></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Dec 2, 2022 at 8:33 PM Hovanes Egiyan <<a href="mailto:hovanes@jlab.org">hovanes@jlab.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg-8902474235087063393">
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<p class="MsoNormal"><span class="m_1463616936547716606DefaultFontHxMailStyle"><span style="font-size:12pt">Hi all,<u></u><u></u></span></span></p>
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<p class="MsoNormal"><span class="m_1463616936547716606DefaultFontHxMailStyle"><span style="font-size:12pt">Since we could not go over all the topics during our last meeting, let’s have an extra CPS meeting coming Monday, December 5th, at 1:30pm JLAB time using Zoom to discuss
CPS design for Hall D. The preliminary agenda is posted at :<u></u><u></u></span></span></p>
<p class="MsoNormal"><span class="m_1463616936547716606DefaultFontHxMailStyle"><span style="font-size:12pt"><u></u><u></u></span></span></p>
<p class="MsoNormal"><span class="m_1463616936547716606DefaultFontHxMailStyle"><span style="font-size:12pt"><a href="https://wiki.jlab.org/klproject/index.php/CPS_meeting_-_December_5,_2022" target="_blank">https://wiki.jlab.org/klproject/index.php/CPS_meeting_-_December_5,_2022</a><u></u><u></u></span></span></p>
<p class="MsoNormal"><span class="m_1463616936547716606DefaultFontHxMailStyle"><span style="font-size:12pt"><u></u> <u></u></span></span></p>
<p class="MsoNormal"><span class="m_1463616936547716606DefaultFontHxMailStyle"><span style="font-size:12pt">Feel free to add more discussion items.<u></u><u></u></span></span></p>
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<p class="MsoNormal"><span class="m_1463616936547716606DefaultFontHxMailStyle"><span style="font-size:12pt">Zoom Meeting ID: 160 854 7409<u></u><u></u></span></span></p>
<p class="MsoNormal"><span class="m_1463616936547716606DefaultFontHxMailStyle"><span style="font-size:12pt">Passcode: 454278<u></u><u></u></span></span></p>
<p class="MsoNormal"><span class="m_1463616936547716606DefaultFontHxMailStyle"><span style="font-size:12pt">URL: <a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__jlab-2Dorg.zoomgov.com_j_1608547409-3Fpwd-3DbWhpZG1yWVk1TWlEb3BjUW9DdmVLZz09&d=DwMFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=u3fDFw2eQBeUcb0_zqxUBOOSjhFiQ-zn9awd1mf1ncg&m=qFSNlA_OEduZjEWacyF0mUZFpOibZzDO4SxepvaJ8RejkCGP_t-vzcU6MFff-kc_&s=xm0Cj0TRr4eM_wmEbfxWgQwv09-U28XeqUdKUDmR4l4&e=" target="_blank">https://jlab-org.zoomgov.com/j/1608547409?pwd=bWhpZG1yWVk1TWlEb3BjUW9DdmVLZz09</a><u></u><u></u></span></span></p>
<p class="MsoNormal"><span class="m_1463616936547716606DefaultFontHxMailStyle"><span style="font-size:12pt"><u></u><u></u></span></span></p>
<p class="MsoNormal"><span class="m_1463616936547716606DefaultFontHxMailStyle"><span style="font-size:12pt"> <u></u><u></u></span></span></p>
<p class="MsoNormal"><span class="m_1463616936547716606DefaultFontHxMailStyle"><span style="font-size:12pt">Best,<u></u><u></u></span></span></p>
<p class="MsoNormal"><span class="m_1463616936547716606DefaultFontHxMailStyle"><span style="font-size:12pt"> Hovanes.<u></u><u></u></span></span></p>
<p class="MsoNormal"><span class="m_1463616936547716606DefaultFontHxMailStyle"><span style="font-size:12pt"><u></u> <u></u></span></span></p>
<p class="MsoNormal"><span class="m_1463616936547716606DefaultFontHxMailStyle"><span style="font-size:12pt"><u></u> <u></u></span></span></p>
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