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<p style="margin-top:0; margin-bottom:0">Hello,</p>
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<p style="margin-top:0; margin-bottom:0">I'm forwarding this email chain to the dsg-hallb_magnets mailing list so Brian and other DSG members that support the magnet can have the full story on what's been happening.</p>
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<p style="margin-top:0; margin-bottom:0">It seems to me that it's a similar problem as the 325 K error with the Cernoxes we had that Brian's
<span>fixed excitation voltage</span> code resolved. If I remember right, the fixed-voltage code has already been applied to all Cernoxes. </p>
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<p style="margin-top:0; margin-bottom:0">Best regards,</p>
<p style="margin-top:0; margin-bottom:0">Tyler<br>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> Probir Ghoshal<br>
<b>Sent:</b> Monday, January 7, 2019 8:10 AM<br>
<b>To:</b> Ruben Fair; David Kashy; hallb-engineering@jlab.org; Nicholas Sandoval; Tyler Lemon<br>
<b>Subject:</b> Re: [New Logentry] Torus Alarm: METAL4K_DT_MAX</font>
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<p style="margin-top:0; margin-bottom:0">Ruben, Dave</p>
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<p>This we have already addressed in the past and if I am not mistaking Brian E had his algorithm that sets the excitation current. The hardware (chassis) seemed to be working.</p>
<p>Rama, Bring and Nick can comment to get the last updated software and the result.</p>
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<p>Regards</p>
<p><br>
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<p>Probir<br>
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<div id="x_divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> Ruben Fair<br>
<b>Sent:</b> Monday, January 7, 2019 8:04 AM<br>
<b>To:</b> David Kashy; hallb-engineering@jlab.org; Nicholas Sandoval; Tyler Lemon; Probir Ghoshal<br>
<b>Subject:</b> Re: [New Logentry] Torus Alarm: METAL4K_DT_MAX</font>
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<p style="margin-top:0; margin-bottom:0">Tyler, Nick, Probir,</p>
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<p style="margin-top:0; margin-bottom:0">Let me know what you think about this. I have also asked Rama to comment.</p>
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<p style="margin-top:0; margin-bottom:0">Ruben<br>
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<div id="x_x_divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> kashy@jlab.org <kashy@jlab.org><br>
<b>Sent:</b> Sunday, January 6, 2019 7:35:02 AM<br>
<b>To:</b> hallb-engineering@jlab.org; Nicholas Sandoval; Tyler Lemon; Probir Ghoshal; Ruben Fair<br>
<b>Subject:</b> [New Logentry] Torus Alarm: METAL4K_DT_MAX</font>
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<h1 class="x_x_x_node-title"><a href="https://logbooks.jlab.org/entry/3641551" rel="bookmark" id="LPlnk983380" class="x_OWAAutoLink" previewremoved="true">Torus Alarm: METAL4K_DT_MAX
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<p class="x_x_x_author-datetime">Lognumber <a href="https://logbooks.jlab.org/entry/3641551" class="x_x_x_lognumber x_OWAAutoLink" id="LPlnk146733" previewremoved="true">
3641551</a>. Submitted by <a href="https://logbooks.jlab.org/user/kashy" id="LPlnk989304" class="x_OWAAutoLink" previewremoved="true">
kashy</a> on <time datetime="2019-01-06T07:31:57-0500"><a href="https://logbooks.jlab.org/entries?start_date=1546774317&end_date=1546781517&book=HBLOG&book=HBTORUS" id="LPlnk218235" class="x_OWAAutoLink" previewremoved="true">Sun, 01/06/2019 - 07:31</a></time>.
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<a href="https://logbooks.jlab.org/book/hbtorus" id="LPlnk457325" class="x_OWAAutoLink" previewremoved="true">
HBTORUS</a></td>
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<th>Entry Makers: </th>
<td>kashy</td>
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<p>Last night at 1/5/2019 at 22:39 there was a 5 second period where the signal went from 4.5K to 255K.
</p>
<p>All signals that go into this this signal jumped at this time.<br>
CCM_DT_MAX<br>
CCM_USHR_DT<br>
CCM_DSHR_DT</p>
<p>But only the first one above went to 255K.</p>
<p>A similar alarm went off this morning at1/6/2019 at 6:16<br>
This time it was triggered by a quick step change from 4.5 to 43K on the USHR signal.</p>
<p>(Neither of these can be real temperature changes so it must be something in the instrumentation)<br>
These were false alarms. Can we find a reason and stop it from happening?</p>
<p>Thanks<br>
Dave</p>
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