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<p style="margin-top:0;margin-bottom:0">Thank you Tyler<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Tyler Lemon<br>
<b>Sent:</b> Thursday, December 20, 2018 8:16:01 AM<br>
<b>To:</b> Ruben Fair; Nicholas Sandoval<br>
<b>Cc:</b> Probir Ghoshal; Denny Insley; dsg-hallb magnets<br>
<b>Subject:</b> Re: Hall B Torus - issue?</font>
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<p style="margin-top:0; margin-bottom:0">Hi Ruben,</p>
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<p style="margin-top:0; margin-bottom:0">I'm trying to look at it on the PLC but my computer is opening the program really slowly.</p>
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<p style="margin-top:0; margin-bottom:0">While I'm waiting, I looked at the archived signals (plot attached) for the interlock (blue signal), Torus current (yellow) and LL8120DP (pink, plot units are for LL8120DP).</p>
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<p style="margin-top:0; margin-bottom:0">It looks like the interlock first tripped when the Torus was at ~-200 A while it was ramping to 0 A.</p>
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<p style="margin-top:0; margin-bottom:0">At that time, LL8120DP dropped from ~71% to ~65% and has since returned to ~70%. It seems that the Helium screen is clear because the signal has probably gone back above its alarm limit.</p>
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<p style="margin-top:0; margin-bottom:0">I will verify this once the PLC program loads and I can connect to the PLC.</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="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Ruben Fair<br>
<b>Sent:</b> Thursday, December 20, 2018 7:56:29 AM<br>
<b>To:</b> Nicholas Sandoval; Tyler Lemon<br>
<b>Cc:</b> Probir Ghoshal; Denny Insley<br>
<b>Subject:</b> Hall B Torus - issue?</font>
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<p style="margin-top:0; margin-bottom:0">Nick, Tyler,</p>
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<p style="margin-top:0; margin-bottom:0">Dan Carman has run both magnets down. However, when the Torus got to about 100 A, it went into a controlled ramp down. Examination of the interlocks suggests a cryogenic 'issue'.</p>
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<p style="margin-top:0; margin-bottom:0">See screen shot below. But examination of the Helium screen does not appear to show any anomaly. Could one of you have a look at this to see what this could be due to?</p>
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<p style="margin-top:0; margin-bottom:0">Regards</p>
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<p style="margin-top:0; margin-bottom:0">Ruben<br>
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