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</style><article id="node-503119" class="node node-logentry article ia-n clearfix" role="article"><header class="node-header"><h1 class="node-title">
<a href="https://logbooks.jlab.org/entry/3430281" rel="bookmark">FADC125 (250) BUSY Distribution and High-Rate performance </a>
</h1>
</header><div class="date-vitals">
<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3430281" class="lognumber" data-lognumber="3430281">3430281</a>. Submitted by <a href="https://logbooks.jlab.org/user/somov">somov</a> on <time datetime="2016-10-18T15:44:28-0400" pubdate="pubdate">Tue, 10/18/2016 - 15:44</time>. </p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/hdlog">HDLOG</a> <a href="https://logbooks.jlab.org/book/hdtrigger">HDTRIGGER</a></td></tr><tr><th>Entry Makers: </th><td>alex somov, ben raydo</td></tr></table></div>
<div class="logentry node-content">
<p>We made some studies of the BUSY distribution and high-rate performance of<br />
the CDC and FDC (BCAL was studied earlier) with Ben several weeks ago;<br />
I forgot to make a log entry.</p>
<p>Configurations:<br />
--------------------</p>
<p> - 4 CDC crates with FADC125 and two trigger crates</p>
<p> - 10 FDC crates with FADC125 and two trigger crates<br />
(the FDC test was performed later, after Cody updated<br />
firmware)</p>
<p> - Detector occupancy: 4 hits in each fadc in each<br />
crate ( 5.6 % occupancy) simulated by lowing threshold<br />
below the baseline. Readout mode - short.</p>
<p> - Trigger: TS front panel external waveform generator<br />
(random trigger used for high-rate performance) </p>
<p> - Standard DAQ settings for CDC / FDC, blocklevel = 40,<br />
bufferlevel = 4. Busy was enabled from fadc modules.</p>
<p>Summary:<br />
-------------</p>
<p>We were able to run CDC/FDC at high rates without<br />
crashing the system; at 100 kHz random trigger rate<br />
(5 % detector occupancy), the live time constitutes 95 %.<br />
Note, the expected trigger rate for high-lumi runs<br />
is about 70-80 kHz</p>
<p>The data rate was about 50 Mb/sec from each crate. We ran<br />
DAQ with CDC for about 9 hours to check stability. The<br />
performance was testes/optimized for various trigger rules<br />
and busy thresholds. We measured the BUSY distribution<br />
time and processing times of fadc250/fadc125 as a function<br />
of the number of hits. Below are some performance results</p>
<p>Performance table (4 CDC crates)<br />
--------------------------------------------</p>
<p>Rate (kHz) Live Time (%) Data Size (Mb/sec from crate)</p>
<p>70 98 35<br />
84 97 42<br />
100 95 46<br />
117 90 58<br />
137 89 65<br />
160 85 72</p>
<p>Some plots:<br />
---------------</p>
<p>Fig. 1: Check busy signal: busy is asserted after the second<br />
unprocessed trigger (BUSY THR = 2). Yellow - FP input triggers,<br />
blue - triggers seens by fadc, magenta - busy propagated to TD.</p>
<p>Fig. 2: Busy distribution for runs with random trigger (BUSY THR = 3).</p>
<p>Fig. 3: DAQ screenshot for the CDC run at 100 kHz: rate</p>
<p>Fig. 4: DAQ screenshot (CDC): live time</p>
<p>Fig. 5: DAQ screenshot (CDC): data rate</p>
</div>
<div class="attachment-box">
<div class="image-wrapper"><img class="image-style-plentybig" src="cid:359acb63614bab6665aa8e4dcce0f714@logbooks.jlab.org" width="800" height="480" alt="" title="Fig. 1" /></div> <div class="image-wrapper"><img class="image-style-plentybig" src="cid:f2a26c76c1c63aaa9059fd1e2d779cc5@logbooks.jlab.org" width="800" height="480" alt="" title="Fig. 2" /></div> <div class="image-wrapper"><img class="image-style-plentybig" src="cid:040584e864ac6f92b55667c8d521292f@logbooks.jlab.org" width="960" height="925" alt="" title="Fig. 3" /></div> <div class="image-wrapper"><img class="image-style-plentybig" src="cid:ea6c889a5257e052997f465d348f2bfc@logbooks.jlab.org" width="960" height="925" alt="" title="Fig. 4" /></div> <div class="image-wrapper"><img class="image-style-plentybig" src="cid:b19913b2f8cf46c90759580941840423@logbooks.jlab.org" width="960" height="925" alt="" title="Fig. 5" /></div> </div>
</article> </div>
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