<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi Amrit,<div class=""><br class=""></div><div class="">These rates are rather big. Where do they come from? </div><div class="">David took many precautions to ensure the box was tight. We didn't quantify it but I would gess the remaining leaks we had were order of magnitudes below these.</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">Thanks,</div><div class=""><br class=""></div><div class="">Mauri</div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Apr 26, 2017, at 2:52 PM, Amrit Yegneswaran <<a href="mailto:yeg@jlab.org" class="">yeg@jlab.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class=""><div style="font-family: tahoma,new york,times,serif; font-size: 14pt; color: #009900" class=""><div class="">brian, marc, and george measured the leakage rates of the ltcc sectors over an extended period of time.<br data-mce-bogus="1" class=""></div><div class="">based on these measurements the results are </div><div class=""><table style="width: 253px; table-layout: fixed;" border="1px" cellpadding="3px" height="185" class=""><tbody class=""><tr class=""><td data-mce-style="text-align: center;" style="text-align: center;" class="">sector <br class=""></td><td data-mce-style="text-align: center;" style="text-align: center;" class=""><div class="">C4F10</div><div class="">L/day<br class=""></div></td><td data-mce-style="text-align: center;" style="text-align: center;" class="">C4F10 kg/day<br class=""></td></tr><tr class=""><td data-mce-style="text-align: center;" style="text-align: center;" class="">1<br class=""></td><td data-mce-style="text-align: center;" style="text-align: center;" class="">95<br class=""></td><td data-mce-style="text-align: center;" style="text-align: center;" class="">1.06<br class=""></td></tr><tr class=""><td data-mce-style="text-align: center;" style="text-align: center;" class=""><span data-mce-style="background-color: #ffff99;" style="background-color: rgb(255, 255, 153);" class="">2</span><br class=""></td><td data-mce-style="text-align: center;" style="text-align: center;" class=""><span data-mce-style="background-color: #ffff99;" style="background-color: rgb(255, 255, 153);" class="">32</span><br class=""></td><td data-mce-style="text-align: center;" style="text-align: center;" class=""><span data-mce-style="background-color: #ffff99;" style="background-color: rgb(255, 255, 153);" class="">0.36</span><br class=""></td></tr><tr class=""><td data-mce-style="text-align: center;" style="text-align: center;" class="">3<br class=""></td><td data-mce-style="text-align: center;" style="text-align: center;" class="">118<br class=""></td><td data-mce-style="text-align: center;" style="text-align: center;" class="">1.32<br class=""></td></tr><tr class=""><td data-mce-style="text-align: center;" style="text-align: center;" class=""><span data-mce-style="background-color: #ffff99;" style="background-color: rgb(255, 255, 153);" class="">4</span><br class=""></td><td data-mce-style="text-align: center;" style="text-align: center;" class=""><span data-mce-style="background-color: #ffff99;" style="background-color: rgb(255, 255, 153);" class="">38</span><br class=""></td><td data-mce-style="text-align: center;" style="text-align: center;" class=""><span data-mce-style="background-color: #ffff99;" style="background-color: rgb(255, 255, 153);" class="">0.43</span><br class=""></td></tr><tr class=""><td data-mce-style="text-align: center;" style="text-align: center;" class=""><span data-mce-style="background-color: #ffff99;" style="background-color: rgb(255, 255, 153);" class="">5</span><br class=""></td><td data-mce-style="text-align: center;" style="text-align: center;" class=""><span data-mce-style="background-color: #ffff99;" style="background-color: rgb(255, 255, 153);" class="">27</span><br class=""></td><td data-mce-style="text-align: center;" style="text-align: center;" class=""><div class=""><span data-mce-style="background-color: #ffff99;" style="background-color: rgb(255, 255, 153);" class="">0.30 </span><br class=""></div></td></tr><tr class=""><td data-mce-style="text-align: center;" style="text-align: center;" class="">6<br data-mce-bogus="1" class=""></td><td data-mce-style="text-align: center;" style="text-align: center;" class="">101<br data-mce-bogus="1" class=""></td><td data-mce-style="text-align: center;" style="text-align: center;" class=""><div class="">1.13<br data-mce-bogus="1" class=""></div></td></tr></tbody></table><br data-mce-bogus="1" class=""></div><div class="">sectors 2, 4 and 5 are best.<br data-mce-bogus="1" class=""></div><div class="">sectors 1, 3, and 6 are worst.<br data-mce-bogus="1" class=""></div><div class=""><br data-mce-bogus="1" class=""></div><div class="">as we have 155 kg of C4F10, and it takes 73 kg to fill a sector we could in principle use any of the sectors for a 30 day run period, e.g. engineering run.<br data-mce-bogus="1" class=""></div><div class="">of-course best would be to select a sector from 2,4,and 5.<br data-mce-bogus="1" class=""></div><div class=""><br data-mce-bogus="1" class=""></div><div class=""><span data-mce-style="color: #ff0000;" style="color: rgb(255, 0, 0);" class=""><em class="">we advise against the removal of the good sectors (2,4, and 5), as it appears the leaks are caused during the process of installation and/or removal.</em></span><br data-mce-bogus="1" class=""></div><div class=""><br data-mce-bogus="1" class=""></div><div class="">for physics runs, if the RICH could be installed in sector 1 we could run run with sectors 2, 4, an 5 at a cost of:<br data-mce-bogus="1" class=""></div><div class="">filling: 3*73kg =219kg -> cost = 219kg*170 $/kg = $37230.<br data-mce-bogus="1" class=""></div><div class="">leakage(ops) : (0.36+0.43+0.30) 1.1kg/day -> cost 1.1kg/day*170 $/kg= 187$/day<br data-mce-bogus="1" class=""></div><div class=""><br data-mce-bogus="1" class=""></div><div class=""><br data-mce-bogus="1" class=""></div><div class=""><br data-mce-bogus="1" class=""></div><div class=""><br data-mce-bogus="1" class=""></div></div></div>_______________________________________________<br class="">Dsg-ltcc mailing list<br class=""><a href="mailto:Dsg-ltcc@jlab.org" class="">Dsg-ltcc@jlab.org</a><br class="">https://mailman.jlab.org/mailman/listinfo/dsg-ltcc<br class=""></div></blockquote></div><br class=""></div></body></html>