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</style><article id="node-521842" 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/3449004" rel="bookmark">High-rate performance testing</a>
</h1>
</header><div class="date-vitals">
<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3449004" class="lognumber" data-lognumber="3449004">3449004</a>. Submitted by <a href="https://logbooks.jlab.org/user/somov">somov</a> on <time datetime="2016-12-21T08:34:32-0500" pubdate="pubdate">Wed, 12/21/2016 - 08:34</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>somov</td></tr></table></div>
<div class="logentry node-content">
<p>We have tested performance of the L1/DAQ at<br />
high rate.</p>
<p>Setup:<br />
-------</p>
<p>Trigger type: </p>
<p>25 FCAL + BCAL > 45000<br />
PS</p>
<p>Configuration:<br />
All detector, reduced size of readout windows,<br />
compressed mode for fadc 125, 250 </p>
<p>block level 40, buffer level 4<br />
Trigger holdoffs correspond to fa125 requirements</p>
<p>Beam conditions:</p>
<p>e current - up to 500 nA<br />
radiator - JD70-100 (58 um)<br />
collimator - 5 mm<br />
converter - 75 um Be</p>
<p>------</p>
<p>Some results:</p>
<p>Not stable DAQ performance was observed at the<br />
trigger rate of about 70 kHz (probably at smaller<br />
rates as well). The beam current corresponded to about<br />
300 nA.</p>
<p>Fig. 1 Live time at the trigger rate of 70 kHz</p>
<p>Fig. 2 Saturation of output buffers<br />
(when live time drops at the previous plot)</p>
<p>Fig 3. Data rate from the detector (about 1 Gb/sec)</p>
<p>Performance of the readout electronics (read out all<br />
modules from the crate, transmit only TI blocks through<br />
Ethernet links) was found to be stable</p>
<p>Fig 4. Live time (no Ethernet transmission except TI<br />
blocks)</p>
<p>The live time decreases to about 70-75 % when the trigger rate was<br />
increased to 90 kHz (400 nA current), see Fig 5.</p>
<p>Crates with the largest data size are:</p>
<p>TAGMH 28.5 k<br />
TAGH1 27 k<br />
TAGM1 38 k (data rate ~80 Mb/sec )</p>
<p>Note, size of the readout window should still be optimized<br />
We also need to check threshols for the microscope</p>
<p>Excluding these crates from the configuration improved the<br />
live time by 3-5%</p>
</div>
<div class="attachment-box">
<div class="image-wrapper"><img view_mode="elog_email" class="image-style-plentybig" src="cid:219a0b4fddfabfc77bffdb7e42716f34@logbooks.jlab.org" width="960" height="763" alt="" title="Fig. 1" /></div> <div class="image-wrapper"><img view_mode="elog_email" class="image-style-plentybig" src="cid:416f41ec79afee25af8e244c14741c76@logbooks.jlab.org" width="960" height="763" alt="" title="Fig. 2" /></div> <div class="image-wrapper"><img view_mode="elog_email" class="image-style-plentybig" src="cid:670d7042bf9b7a1e49c726f4e5a4dac1@logbooks.jlab.org" width="960" height="763" alt="" title="Fig. 3" /></div> <div class="image-wrapper"><img view_mode="elog_email" class="image-style-plentybig" src="cid:53618f34c1c92a75f981da76c1ff242e@logbooks.jlab.org" width="960" height="763" alt="" title="Fig. 4" /></div> <div class="image-wrapper"><img view_mode="elog_email" class="image-style-plentybig" src="cid:05f89889dea0ac284076308ff9c501ba@logbooks.jlab.org" width="960" height="763" alt="" title="Fig. 5" /></div> </div>
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