<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 All,<div class=""><br class=""></div><div class=""> Minutes from this afternoon’s meeting have been posted:</div><div class=""><br class=""></div><div class=""><a href="https://halldweb.jlab.org/wiki/index.php/GlueX_Level-3_Trigger_Meeting,_Apr_13,_2017" class="">https://halldweb.jlab.org/wiki/index.php/GlueX_Level-3_Trigger_Meeting,_Apr_13,_2017</a></div><div class=""><br class=""></div><div class=""><h1 style="background-image: none; background-color: rgb(255, 255, 255); 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; orphans: 2; widows: 2; background-position: initial initial; background-repeat: initial initial;" class=""><span class="mw-headline" id="Minutes">Minutes</span><span class="mw-editsection" style="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=GlueX_Level-3_Trigger_Meeting,_Apr_13,_2017&action=edit§ion=6" 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: 1.5em; font-family: sans-serif; font-size: 12.7px; font-variant-ligatures: normal; orphans: 2; widows: 2; background-color: rgb(255, 255, 255);" class="">Attendees: Simon T., Elton S., Alex S., Dave A., Sergey F., David L.</div><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=); font-family: sans-serif; font-size: 12.7px; font-variant-ligatures: normal; orphans: 2; widows: 2; background-color: rgb(255, 255, 255);" class=""><li style="margin-bottom: 0.1em;" class="">Summary of final report from last July's L3 "mini-review" presented</li><li style="margin-bottom: 0.1em;" class="">Current status of DAQ parameters (as understood by David) was presented<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="">DAQ event rate is currently limited by (according to Alex S.):<ol style="line-height: 1.5em; margin: 0.3em 0px 0px 3.2em; padding: 0px; list-style-image: none;" class=""><li style="margin-bottom: 0.1em;" class="">CAEN TDCs</li><li style="margin-bottom: 0.1em;" class="">TPOL</li><li style="margin-bottom: 0.1em;" class="">CDC</li></ol></li><li style="margin-bottom: 0.1em;" class="">95kHz readout rate tested and should be used as one limiting parameter</li><li style="margin-bottom: 0.1em;" class="">L1 trigger goal according to Alex is 70kHz-80kHz<ul style="line-height: 1.5em; 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="">Currently unknown when accidentals become enough of an issue that increasing beam current does not gain us anything</li><li style="margin-bottom: 0.1em;" class="">This includes L1 rate reduction due to including ST in trigger. This sparked some discussion.</li><li style="margin-bottom: 0.1em;" class="">Current data rate estimates are up at or just over 2GB/s without ST. Closer to 1.5GB/s with ST</li></ul></li></ul></li><li style="margin-bottom: 0.1em;" class="">Two high intensity data sets were taken in Fall 2016. None were taken in Spring 2017./</li><li style="margin-bottom: 0.1em;" class="">Conversion from beam current to photon beam intensity on target not fully understood in David'd analysis<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="">Alex described how he used PS rates and gets consistent results between Fall 2016 and Spring 2017 data<ul style="line-height: 1.5em; 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="">Transmission improved by roughly 20% since the Fall</li></ul></li></ul></li><li style="margin-bottom: 0.1em;" class="">We will meet again next week and weekly until the review<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="">Action Items:<ol style="line-height: 1.5em; margin: 0.3em 0px 0px 3.2em; padding: 0px; list-style-image: none;" class=""><li style="margin-bottom: 0.1em;" class="">Clarify beam intensity for Fall 2016 high intensity data sets and correlate to Spring 2017 conditions using PS (David)</li><li style="margin-bottom: 0.1em;" class="">Estimate data volume and compare to what was previously provided to CC and use to estimate additional tape and hardware cost (David)</li><li style="margin-bottom: 0.1em;" class="">Reinstall reprogrammed TD board in Hall (Alex)</li><li style="margin-bottom: 0.1em;" class="">Continue testing of dual stream writing at high rate (Dave A., Sergey F.)</li></ol></li></ul></li></ul><div class=""><br class=""></div></div><div class=""><br class=""></div></body></html>