<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi Folks,<div class=""><br class=""></div><div class=""> I posted some minutes from Friday’s CPP meeting on the meeting page at the following link and copied below.</div><div class=""><br class=""></div><div class=""><a href="https://halldweb.jlab.org/wiki/index.php/Π_polarizability_Meeting_July_1,_2016" class="">https://halldweb.jlab.org/wiki/index.php/%CE%A0_polarizability_Meeting_July_1,_2016</a></div><div class=""><br class=""></div><div class="">Regards,</div><div class="">-David</div><div class=""><br class=""></div><div class=""><h1 style="font-weight: normal; margin: 0px 0px 0.6em; overflow: hidden; padding-top: 0.5em; padding-bottom: 0.17em; border-bottom-width: 1px; border-bottom-style: solid; border-bottom-color: rgb(170, 170, 170); font-size: 23.876px; font-family: sans-serif; font-variant-ligatures: normal; font-variant-position: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; line-height: 19.05px; widows: 1; background-image: none; background-color: rgb(255, 255, 255); background-position: initial initial; background-repeat: initial initial;" class=""><span class="mw-headline" id="Minutes">Minutes</span><span class="mw-editsection" style="-webkit-user-select: none; font-size: small; margin-left: 1em; vertical-align: baseline; line-height: 1em; display: inline-block;"><span class="mw-editsection-bracket">[</span><a href="https://halldweb.jlab.org/wiki/index.php?title=%CE%A0_polarizability_Meeting_July_1,_2016&action=edit§ion=5" title="Edit section: Minutes" style="text-decoration: none; color: rgb(90, 54, 150); background: none;" class="">edit</a><span class="mw-editsection-bracket">]</span></span></h1><div style="margin: 0.4em 0px 0.5em; line-height: 19.05px; font-family: sans-serif; font-size: 12.7px; font-variant-ligatures: normal; font-variant-position: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; widows: 1; background-color: rgb(255, 255, 255);" class="">Attendees: Rory M. (chair), David L., Elton S., Andrew S., Mark D., Ilia L., Serguei G.</div><h2 style="font-weight: normal; margin: 0px 0px 0.6em; overflow: hidden; padding-top: 0.5em; padding-bottom: 0.17em; border-bottom-width: 1px; border-bottom-style: solid; border-bottom-color: rgb(170, 170, 170); font-size: 19.05px; font-family: sans-serif; font-variant-ligatures: normal; font-variant-position: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; line-height: 19.05px; widows: 1; background-image: none; background-color: rgb(255, 255, 255); background-position: initial initial; background-repeat: initial initial;" class=""><span class="mw-headline" id="Announcements">Announcements</span><span class="mw-editsection" style="-webkit-user-select: none; font-size: small; margin-left: 1em; vertical-align: baseline; line-height: 1em; display: inline-block;"><span class="mw-editsection-bracket">[</span><a href="https://halldweb.jlab.org/wiki/index.php?title=%CE%A0_polarizability_Meeting_July_1,_2016&action=edit§ion=6" title="Edit section: Announcements" style="text-decoration: none; color: rgb(90, 54, 150); background: none;" class="">edit</a><span class="mw-editsection-bracket">]</span></span></h2><ul style="line-height: 19.05px; list-style-type: square; margin: 0.3em 0px 0px 1.6em; padding: 0px; list-style-image: url(data:image/gif;base64,R0lGODlhBQANAIAAAGOMnP///yH5BAEAAAEALAAAAAAFAA0AAAIJjI+pu+APo4SpADs=); font-family: sans-serif; font-size: 12.7px; font-variant-ligatures: normal; font-variant-position: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; widows: 1; background-color: rgb(255, 255, 255);" class=""><li style="margin-bottom: 0.1em;" class="">Chambers accidentally set 500V too high in lab. No obvious damage but brief procedure review will be done.</li><li style="margin-bottom: 0.1em;" class="">Ilia (in attendance) will officially start with UMass on Aug. 25th (delayed due to visa issues)</li><li style="margin-bottom: 0.1em;" class="">Bobby attended G4 workshop last week at MIT. Will be going to JLab in a couple of weeks and will work on simulation.</li></ul><h2 style="font-weight: normal; margin: 0px 0px 0.6em; overflow: hidden; padding-top: 0.5em; padding-bottom: 0.17em; border-bottom-width: 1px; border-bottom-style: solid; border-bottom-color: rgb(170, 170, 170); font-size: 19.05px; font-family: sans-serif; font-variant-ligatures: normal; font-variant-position: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; line-height: 19.05px; widows: 1; background-image: none; background-color: rgb(255, 255, 255); background-position: initial initial; background-repeat: initial initial;" class=""><span class="mw-headline" id="Carts">Carts</span><span class="mw-editsection" style="-webkit-user-select: none; font-size: small; margin-left: 1em; vertical-align: baseline; line-height: 1em; display: inline-block;"><span class="mw-editsection-bracket">[</span><a href="https://halldweb.jlab.org/wiki/index.php?title=%CE%A0_polarizability_Meeting_July_1,_2016&action=edit§ion=7" title="Edit section: Carts" style="text-decoration: none; color: rgb(90, 54, 150); background: none;" class="">edit</a><span class="mw-editsection-bracket">]</span></span></h2><ul style="line-height: 19.05px; list-style-type: square; margin: 0.3em 0px 0px 1.6em; padding: 0px; list-style-image: url(data:image/gif;base64,R0lGODlhBQANAIAAAGOMnP///yH5BAEAAAEALAAAAAAFAA0AAAIJjI+pu+APo4SpADs=); font-family: sans-serif; font-size: 12.7px; font-variant-ligatures: normal; font-variant-position: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; widows: 1; background-color: rgb(255, 255, 255);" class=""><li style="margin-bottom: 0.1em;" class="">Initial design for cart to hold and transport MWPC was shown.</li><li style="margin-bottom: 0.1em;" class="">These are needed because the carts weigh a lot (couple of hundred pounds each) and have fragile electronics or gas couplings on every side and so must be held a couple of inches off the ground.</li><li style="margin-bottom: 0.1em;" class="">Considering using these for transport to JLab as well since a similar structure will be needed.</li></ul><h2 style="font-weight: normal; margin: 0px 0px 0.6em; overflow: hidden; padding-top: 0.5em; padding-bottom: 0.17em; border-bottom-width: 1px; border-bottom-style: solid; border-bottom-color: rgb(170, 170, 170); font-size: 19.05px; font-family: sans-serif; font-variant-ligatures: normal; font-variant-position: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; line-height: 19.05px; widows: 1; background-image: none; background-color: rgb(255, 255, 255); background-position: initial initial; background-repeat: initial initial;" class=""><span class="mw-headline" id="MWPC_construction">MWPC construction</span><span class="mw-editsection" style="-webkit-user-select: none; font-size: small; margin-left: 1em; vertical-align: baseline; line-height: 1em; display: inline-block;"><span class="mw-editsection-bracket">[</span><a href="https://halldweb.jlab.org/wiki/index.php?title=%CE%A0_polarizability_Meeting_July_1,_2016&action=edit§ion=8" title="Edit section: MWPC construction" style="text-decoration: none; color: rgb(90, 54, 150); background: none;" class="">edit</a><span class="mw-editsection-bracket">]</span></span></h2><ul style="line-height: 19.05px; list-style-type: square; margin: 0.3em 0px 0px 1.6em; padding: 0px; list-style-image: url(data:image/gif;base64,R0lGODlhBQANAIAAAGOMnP///yH5BAEAAAEALAAAAAAFAA0AAAIJjI+pu+APo4SpADs=); font-family: sans-serif; font-size: 12.7px; font-variant-ligatures: normal; font-variant-position: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; widows: 1; background-color: rgb(255, 255, 255);" class=""><li style="margin-bottom: 0.1em;" class="">HV boards have been attached to frame of full scale prototype</li><li style="margin-bottom: 0.1em;" class="">Al plate gouges smoothed out to make surface smooth to the touch</li><li style="margin-bottom: 0.1em;" class="">Machinist currently cutting grooves into G10. Some delays after first piece.</li><li style="margin-bottom: 0.1em;" class="">Elton: FDC had to paint epoxy in grooves to prevent gas leaks<ul style="line-height: 1.5em; list-style-type: square; margin: 0.3em 0px 0px 1.6em; padding: 0px; list-style-image: url("data:image/gif;base64,R0lGODlhBQANAIAAAGOMnP///yH5BAEAAAEALAAAAAAFAA0AAAIJjI+pu+APo4SpADs=");" class=""><li style="margin-bottom: 0.1em;" class="">Rory spoke with Lubomir about that and had an understanding of technique. Will first attempt to polish grooves to see if that will suffice.</li></ul></li><li style="margin-bottom: 0.1em;" class="">Wire Stringing:<ul style="line-height: 1.5em; list-style-type: square; margin: 0.3em 0px 0px 1.6em; padding: 0px; list-style-image: url("data:image/gif;base64,R0lGODlhBQANAIAAAGOMnP///yH5BAEAAAEALAAAAAAFAA0AAAIJjI+pu+APo4SpADs=");" class=""><li style="margin-bottom: 0.1em;" class="">Using long threaded rod with thread pitch that is multiple of 1/10"</li><li style="margin-bottom: 0.1em;" class="">Typical threaded rod has poor accuracy over long lengths</li><li style="margin-bottom: 0.1em;" class="">More accurate to cut than to extrude (most are extruded)</li><li style="margin-bottom: 0.1em;" class="">Rod bows some under its own weight. Possible to prevent with a brace in the center</li><li style="margin-bottom: 0.1em;" class="">Looking for manufacturer willing to produce only a 1 or 2 rods</li></ul></li></ul><h2 style="font-weight: normal; margin: 0px 0px 0.6em; overflow: hidden; padding-top: 0.5em; padding-bottom: 0.17em; border-bottom-width: 1px; border-bottom-style: solid; border-bottom-color: rgb(170, 170, 170); font-size: 19.05px; font-family: sans-serif; font-variant-ligatures: normal; font-variant-position: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; line-height: 19.05px; widows: 1; background-image: none; background-color: rgb(255, 255, 255); background-position: initial initial; background-repeat: initial initial;" class=""><span class="mw-headline" id=".CF.80.2B.CF.80-_simulation">π<sup style="line-height: 1;" class="">+</sup>π<sup style="line-height: 1;" class="">-</sup> simulation</span><span class="mw-editsection" style="-webkit-user-select: none; font-size: small; margin-left: 1em; vertical-align: baseline; line-height: 1em; display: inline-block;"><span class="mw-editsection-bracket">[</span><a href="https://halldweb.jlab.org/wiki/index.php?title=%CE%A0_polarizability_Meeting_July_1,_2016&action=edit§ion=9" title="Edit section: π+π- simulation" style="text-decoration: none; color: rgb(90, 54, 150); background: none;" class="">edit</a><span class="mw-editsection-bracket">]</span></span></h2><ul style="line-height: 19.05px; list-style-type: square; margin: 0.3em 0px 0px 1.6em; padding: 0px; list-style-image: url(data:image/gif;base64,R0lGODlhBQANAIAAAGOMnP///yH5BAEAAAEALAAAAAAFAA0AAAIJjI+pu+APo4SpADs=); font-family: sans-serif; font-size: 12.7px; font-variant-ligatures: normal; font-variant-position: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; widows: 1; background-color: rgb(255, 255, 255);" class=""><li style="margin-bottom: 0.1em;" class="">Elton simulated events produced by Justin's ρ -> π<sup style="line-height: 1;" class="">+</sup>π<sup style="line-height: 1;" class="">-</sup> generator</li><li style="margin-bottom: 0.1em;" class="">Generator required <a rel="nofollow" class="external text" href="http://amptools.sourceforge.net/index.php/Main_Page" style="text-decoration: none; color: rgb(102, 51, 102); padding-right: 15px; background: linear-gradient(transparent, transparent) right center no-repeat, url("data:image/svg+xml;base64,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");">AmpTools</a> package</li><li style="margin-bottom: 0.1em;" class="">Configuration files documented in e-log entry (linked in agenda above)</li><li style="margin-bottom: 0.1em;" class="">Currently configured for proton target with Coherent photon peak at 9GeV. Will update for future studies</li></ul><h2 style="font-weight: normal; margin: 0px 0px 0.6em; overflow: hidden; padding-top: 0.5em; padding-bottom: 0.17em; border-bottom-width: 1px; border-bottom-style: solid; border-bottom-color: rgb(170, 170, 170); font-size: 19.05px; font-family: sans-serif; font-variant-ligatures: normal; font-variant-position: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; line-height: 19.05px; widows: 1; background-image: none; background-color: rgb(255, 255, 255); background-position: initial initial; background-repeat: initial initial;" class=""><span class="mw-headline" id="CPPsim">CPPsim</span><span class="mw-editsection" style="-webkit-user-select: none; font-size: small; margin-left: 1em; vertical-align: baseline; line-height: 1em; display: inline-block;"><span class="mw-editsection-bracket">[</span><a href="https://halldweb.jlab.org/wiki/index.php?title=%CE%A0_polarizability_Meeting_July_1,_2016&action=edit§ion=10" title="Edit section: CPPsim" style="text-decoration: none; color: rgb(90, 54, 150); background: none;" class="">edit</a><span class="mw-editsection-bracket">]</span></span></h2><ul style="line-height: 19.05px; list-style-type: square; margin: 0.3em 0px 0px 1.6em; padding: 0px; list-style-image: url(data:image/gif;base64,R0lGODlhBQANAIAAAGOMnP///yH5BAEAAAEALAAAAAAFAA0AAAIJjI+pu+APo4SpADs=); font-family: sans-serif; font-size: 12.7px; font-variant-ligatures: normal; font-variant-position: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; widows: 1; background-color: rgb(255, 255, 255);" class=""><li style="margin-bottom: 0.1em;" class="">David showed comparison of CPPsim (GEANT 4) output with the hdgeant (GEANT 3) simulation</li><li style="margin-bottom: 0.1em;" class="">Reasonable agreement for TOF and FCAL<ul style="line-height: 1.5em; list-style-type: square; margin: 0.3em 0px 0px 1.6em; padding: 0px; list-style-image: url("data:image/gif;base64,R0lGODlhBQANAIAAAGOMnP///yH5BAEAAAEALAAAAAAFAA0AAAIJjI+pu+APo4SpADs=");" class=""><li style="margin-bottom: 0.1em;" class="">Some fine structure doesn't match, but broad structure does</li></ul></li><li style="margin-bottom: 0.1em;" class="">FMWPC absorber needs to be verified (only present in CPPsim)</li></ul><h2 style="font-weight: normal; margin: 0px 0px 0.6em; overflow: hidden; padding-top: 0.5em; padding-bottom: 0.17em; border-bottom-width: 1px; border-bottom-style: solid; border-bottom-color: rgb(170, 170, 170); font-size: 19.05px; font-family: sans-serif; font-variant-ligatures: normal; font-variant-position: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; line-height: 19.05px; widows: 1; background-image: none; background-color: rgb(255, 255, 255); background-position: initial initial; background-repeat: initial initial;" class=""><span class="mw-headline" id="Next_Meeting">Next Meeting</span><span class="mw-editsection" style="-webkit-user-select: none; font-size: small; margin-left: 1em; vertical-align: baseline; line-height: 1em; display: inline-block;"><span class="mw-editsection-bracket">[</span><a href="https://halldweb.jlab.org/wiki/index.php?title=%CE%A0_polarizability_Meeting_July_1,_2016&action=edit§ion=11" title="Edit section: Next Meeting" style="text-decoration: none; color: rgb(90, 54, 150); background: none;" class="">edit</a><span class="mw-editsection-bracket">]</span></span></h2><div style="margin: 0.4em 0px 0.5em; line-height: 19.05px; font-family: sans-serif; font-size: 12.7px; font-variant-ligatures: normal; font-variant-position: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; widows: 1; background-color: rgb(255, 255, 255);" class="">The next meeting is scheduled for Fri. July 15th at 9:30 am JLab time</div></div></body></html>