<div dir="ltr">Dear all,<div><br></div><div>To close the loop on this thread, at Hovanes' suggestion I looked at TAGH counters with multiple TDC hits in them, and plotted the time difference between the first hit and each successive hit. I've attached such a plot for counter 250, and the time difference between the peaks does show that the RF period is ~4 ns.</div><div><br></div><div><br></div><div>Cheers,</div><div>Sean</div><div><br><br><div class="gmail_quote">On Thu, Apr 30, 2015 at 10:32 AM Sean Dobbs <<a href="mailto:s-dobbs@northwestern.edu">s-dobbs@northwestern.edu</a>> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Thanks, Hovanes, for clearing this up, and sorry for the confusion. I will update CCDB accordingly. <br><br>---Sean<br><div class="gmail_quote">On Thu, Apr 30, 2015 at 9:48 AM Richard Jones <<a href="mailto:richard.t.jones@uconn.edu" target="_blank">richard.t.jones@uconn.edu</a>> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<div dir="ltr">Hovanes,
<div><br>
</div>
<div>That is what I thought. Thank you for the clarification, Hovanes.</div></div></div><div><div dir="ltr">
<div><br>
</div>
<div>-Richard Jones</div>
</div></div><div><div class="gmail_extra"><div class="gmail_quote">On Thu, Apr 30, 2015 at 10:38 AM, Hovanes Egiyan <span dir="ltr">
<<a href="mailto:hovanes.egiyan@gmail.com" target="_blank">hovanes.egiyan@gmail.com</a>></span> wrote:<br>
</div></div></div><div><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div text="#000000" bgcolor="#FFFFFF">
<div>Hi Sean, <br>
MO signal that we have is at ~499MHz (and it will be prescaled before arriving to TDCs to much lower frequency),
<br>
but the beam bunches themselves should now arrive to Hall D and the tagger hall at ~249MHz frequency.
<br>
<span><font color="#888888">Hovanes. <br>
</font></span>
<div>
<div><br>
<br>
On 04/30/2015 09:53 AM, Sean Dobbs wrote:<br>
</div>
</div>
</div>
</div></blockquote></div></div></div><div><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div text="#000000" bgcolor="#FFFFFF"><div>
<div>
<blockquote type="cite">
<div dir="ltr">Hi Richard,<br>
<br>
<div>Are you using the latest version of the CCDB constants? I updated the rf_period yesterday based on the results of a meeting Paul Mattione had on the MO. </div>
<div>
<p>I see the following results:<br>
<br>
farm1401> ccdb dump /PHOTON_BEAM/RF/rf_period:2933 <br>
#Spring running is at ~2ns period <br>
2.004008 </p>
<p>From HDGeant: (Run 2933)</p>
<p> settofg: beam_bucket_period_ns set to 2.0040081 <br>
</p>
<p><br>
</p>
<p>---Sean</p>
<p><br>
On Thu, Apr 30, 2015 at 8:44 AM Richard Jones <<a href="mailto:richard.t.jones@uconn.edu" target="_blank">richard.t.jones@uconn.edu</a>> wrote:</p>
</div>
<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<div dir="ltr">Hello Mark,
<div><br>
</div>
<div>From the minutes, "</div>
</div>
</div>
<div>
<div dir="ltr">
<ul style="font-size:12.8000001907349px">
<li style="margin-left:15px"><b>HDGeant now uses RF period in CCDB</b>. Paul checked in a change such that HDGeant will look up the bunch frequency from the CCDB when simulating electromagnetic background. The current setting in the database is 499 MHz.
</li></ul>
</div>
</div>
<div>
<div dir="ltr">
<div><span style="font-size:12.8000001907349px">I am not sure which change that refers to, but yesterday I checked in a change to HDGeant that fits this description. The current setting in the database is close to 250 MHz, not 500 MHz. This is what I see when
I run hdgeant with a RUNNO set to a number in the current range, eg 2933:</span></div>
<div><span style="font-size:12.8000001907349px"><br>
</span></div>
<div>
<pre style="color:rgb(0,0,0)"> settofg: beam_bucket_period_ns set to 4.0080161 </pre>
</div>
<div><span style="font-size:12.8000001907349px"><br>
</span></div>
<div><span style="font-size:12.8000001907349px">-Richard Jones</span></div>
</div>
<div class="gmail_extra"><br>
</div>
</div>
<div>
<div class="gmail_extra">
<div class="gmail_quote">On Wed, Apr 29, 2015 at 4:30 PM, Mark Ito <span dir="ltr">
<<a href="mailto:marki@jlab.org" target="_blank">marki@jlab.org</a>></span> wrote:<br>
</div>
</div>
</div>
<div>
<div class="gmail_extra">
<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">Folks,<br>
<br>
Please find the minutes below and at<br>
<br>
<a href="https://halldweb.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_April_29,_2015" target="_blank">
https://halldweb.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_April_29,_2015</a><br>
<br>
-- Mark<br>
_________________________________________________<br>
<br>
<div>
<div>
<div><span dir="auto"></span>
<div>
<div dir="ltr" lang="en">GlueX Offline Software Meeting<br>
<span>Minutes</span><br>
<br>
Present: <br>
<ul>
<li><b>CMU</b>: Curtis Meyer </li><li><b>FSU</b>: Aristeidis Tsaris </li><li><b>JLab</b>: Mark Ito (chair), David Lawrence, Paul Mattione, Kei Moriya, Nathan Sparks, Justin Stevens, Simon Taylor
</li><li><b>NU</b>: Sean Dobbs </li></ul>
<br>
<span>Announcements</span><br>
<ul>
<li><b>Nightly build results on web</b>. Mark has put the <a rel="nofollow" href="https://halldweb.jlab.org/nightly/nightly_build_errors.txt" target="_blank">
summary of nightly build errors and warnings</a> on the web. He led us through the
<a rel="nofollow" href="https://mailman.jlab.org/pipermail/halld-offline/2015-April/002015.html" target="_blank">
email</a> announcing it. </li><li><b>HDGeant now uses RF period in CCDB</b>. Paul checked in a change such that HDGeant will look up the bunch frequency from the CCDB when simulating electromagnetic background. The current setting in the database is 499 MHz.
</li></ul>
<br>
<span>Review of minutes from April 15</span><br>
<br>
We went over the <a href="https://halldweb.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_April_15,_2015#Minutes" title="GlueX Offline Meeting, April
15, 2015" target="_blank">
minutes from last time</a>. <br>
<br>
David gave us an update on his Geant4 implementation. He as put in the FDC and FCAL and can reconstruct tracks in the FDC with resolution comparable with those found with HDGeant. He ran into an issue with multi-threading; a bug report has been submitted to
the Geant4 Collaboration. <br>
<br>
<span>Offline Monitoring</span><br>
<br>
Kei reported he has run over most of the files collected in the last week of data-taking. The volume of data is small, it only takes a few hours to run over everything.
<br>
<br>
We then discussed doing a final run over the Fall data so that people can use the data to prepare for the collaboration meeting. There is a change to get the setting of the F1-TDC parameters from the CCDB that Justin checked in yesterday. There are also new
TOF timing constants that we are not taking advantage of yet. In addition Lubomir also has new FDC alignment numbers. For all of these reasons a re-run seems desirable but time is running short to have the data available in time to be useful. We agreed on
a launch time target at the end of the day on Friday. <br>
<br>
There was a bit of discussion of what data we have from the current run. Most of it is in run 2931, which is contained in just over 100 files and has about 75 million events. Data were taken in mode 7 with an FCAL-BCAL trigger.
<br>
<br>
<span>Spring 2015 Commissioning Simulations</span><br>
<br>
Sean described the <a href="https://halldweb.jlab.org/wiki/index.php/Spring_2015_Commissioning_Simulations" title="Spring 2015 Commissioning
Simulations" target="_blank">
conditions</a> he is proposing and solicited feedback. The software has been tagged but not released. Paul noted that the nominal position of the coherent peak is 3.4 GeV. The gxproj4 account will be used to run the jobs.
<br>
<br>
On a side note, Mark has put in a request to the Computer Center for a <a href="https://halldweb.jlab.org/wiki/index.php/GlueX-related_shared_accounts_on_the_JLab_CUE" title="GlueX-related shared accounts
on the JLab CUE" target="_blank">
gxproj5</a> account. <br>
</div>
<div><br>
Retrieved from "<a dir="ltr" href="https://halldweb.jlab.org/wiki/index.php?title=GlueX_Offline_Meeting,_April_29,_2015&oldid=66573" target="_blank">https://halldweb.jlab.org/wiki/index.php?title=GlueX_Offline_Meeting,_April_29,_2015&oldid=66573</a>"</div>
</div>
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</div>
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</blockquote>
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