<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="">The boxes were leak tested in two ways:</div><div class=""><br class=""></div><div class="">1. sniffing freon from around the box - fixing all detectable leaks</div><div class="">2. filling the boxes with nitrogen and checking that, taking atmospheric pressure into account, the box hold the pressure</div><div class=""><br class=""></div><div class="">We didn't quantify the leaks.</div><div class=""><br class=""></div><div class="">David, who is cc-end and did this work, can provide further details. He did it three times:</div><div class=""><br class=""></div><div class="">1. as preparation, in TED.</div><div class="">2. once the boxes were in the hall</div><div class="">3. once the boxes were mounted on the forward carriage.</div><div class=""><br class=""></div><div class="">He found considerable leaks in both 1 and 3 cases.</div><div class=""><br class=""></div><div class="">Regarding your question on the LTCC window. </div><div class="">That was 3mils or mylar = 0.0762mm, which has radiation length of 285 mm.</div><div class="">So radiation length X/X0 = 0.0267%.</div><div class=""><br class=""></div><div class="">It was sandwiched betwen 1.5 mils of tedlar, I think it has similar rad length.</div><div class=""><br class=""></div><div class="">Regards,</div><div class="">Mauri</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Apr 14, 2017, at 11:53 AM, 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="">hello,<br data-mce-bogus="1" class=""></div><div class=""><br data-mce-bogus="1" class=""></div><div class="">i see from my records that the ltcc leak test was performed jul/aug of 2015.<br data-mce-bogus="1" class=""></div><div class="">i do not have records of what the leak rate was at that time.<br data-mce-bogus="1" class=""></div><div class="">all i have e-mails saying that the leak test was successful and that the ltcc were taken to the hall before the final seal was done.<br data-mce-bogus="1" class=""></div><div class=""><br data-mce-bogus="1" class=""></div><div class="">i'm sure that someone has a record of the leaks, for each sector, that were measured at that time.<br data-mce-bogus="1" class=""></div><div class="">i would like to compare the present leak rate with that measured at that time.<br data-mce-bogus="1" class=""></div><div class=""><br data-mce-bogus="1" class=""></div><div class="">thank you for your help.<br data-mce-bogus="1" class=""></div><div class="">sincerely<br data-mce-bogus="1" class=""></div><div class="">amrit<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>