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<p class="xxmsonormal">Good afternoon,<o:p></o:p></p>
<p class="xxmsonormal">Facilities will be shutting off 4160V power to ESR1 on December 20<sup>th
</sup>(weather permitting), and again the first week of January, to repair the switchgear for ESR2. We anticipate the power will be shut off for up to 4 hours and will be doing controlled shutdowns of ESR ahead of the outages. We will be shutting down the compressors
and the Halls will stop receiving cryogens during this time. CHL recovery will be processing all the return flow from the Halls as well as ESR1. Cryo will communicate with Hall liaisons to initiate shutdown, coordinate recovery flows, and monitor cooldowns.
Please direct any questions to me. The following is the general procession of events.
<o:p></o:p></p>
<p class="xxmsonormal"><o:p> </o:p></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="xxmsonormal" style="mso-list:l1 level1 lfo2">Beam turns off at ~0700<o:p></o:p></li><li class="xxmsonormal" style="mso-list:l1 level1 lfo2">Halls ramp down magnets <o:p>
</o:p></li><li class="xxmsonormal" style="mso-list:l1 level1 lfo2">ESR1 coldbox and compressor shutdown<o:p></o:p></li><li class="xxmsonormal" style="mso-list:l1 level1 lfo2">4160V turns off<o:p></o:p></li><li class="xxmsonormal" style="mso-list:l1 level1 lfo2">Switchgear work<o:p></o:p></li><li class="xxmsonormal" style="mso-list:l1 level1 lfo2">4160V turns on<o:p></o:p></li><li class="xxmsonormal" style="mso-list:l1 level1 lfo2">ESR1 coldbox and compressor restart<o:p></o:p></li><li class="xxmsonormal" style="mso-list:l1 level1 lfo2">Cooldown Halls<o:p></o:p></li></ol>
<p class="xxmsonormal"><o:p> </o:p></p>
<p class="xxmsonormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Brendan White<o:p></o:p></p>
<p class="MsoNormal">Cryogenics Electrical Engineer<o:p></o:p></p>
<p class="MsoNormal">Thomas Jefferson National Accelerator Facility<o:p></o:p></p>
<p class="MsoNormal">(757) 269-6070<o:p></o:p></p>
<p class="MsoNormal">brendanw@jlab.org<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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