<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: arial,helvetica,sans-serif; font-size: 10pt; color: #000000'>Hi,<br><br> Hall C has magnets running off of the HXs to keep their temps below 100K. Turning off and on the 300K for 8 hours for three days straight will be rather bothersome as this would require stopping and starting the HXs each day. It may be better to keep the 300K off for the whole duration, but three days is a long period.<br>Is it that each hall will only be turned off one of the three days? If this is the case, then it is not a problem to HallC.<br><br>Steven<br><br><br><hr id="zwchr"><div style="color: rgb(0, 0, 0); font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;"><b>From: </b>"Dave Kashy" <kashy@jlab.org><br><b>To: </b>"Christopher Perry" <cperry@jlab.org>, lassiter@jlab.org<br><b>Cc: </b>"Joe Wilson" <jwilson@jlab.org>, esr-users@jlab.org<br><b>Sent: </b>Friday, June 8, 2018 11:59:24 AM<br><b>Subject: </b>Re: Halls Helium outages<br><br>Hi Chris <br>I know Halls B and C are using 4 atm helium.<br><br>Hall B can go for the 3 days with out 4atm helium.<br>Will we be able to float on recovery?<br><br>Steve <br>Will you want to go on and off or just<br>Float like B?<br><br>Dave<br><br>Sent from my iPhone<br><br>> On Jun 8, 2018, at 11:09 AM, Christopher Perry <cperry@jlab.org> wrote:<br>> <br>> Dave,<br>> We will be performing work on the mass-in and mass-out valves at ESR which will result in 3 separate 8 hour disruptions in the 4 atm helium flow to the halls. The first 4 atm outage will occur Tuesday morning (June 12th) at 8:00 am. The following outages will occur on Wednesday (June 13th) at 8:00 am, and Thursday (June 14th) at 8:00 am. <br>> <br>> <br>> Chris Perry<br>> Mechanical Engineer<br>> Cryogenics Group<br>> Thomas Jefferson National Accelerator Facility<br>> 12000 Jefferson Ave, Newport News, VA 23606<br>> cperry@jlab.org<br>> (757) 269-6157<br></div><br></div></body></html>