<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 Dave,<br> Hall C needs at least 10 g/s to maintain transfer lines temp.<br><br>Steven<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>"esr-users" <esr-users@jlab.org><br><b>Cc: </b>"rossi patrizia" <rossi@jlab.org>, "Arne Freyberger" <freyberg@jlab.org>, "Rolf Ent" <ent@jlab.org><br><b>Sent: </b>Wednesday, March 7, 2018 10:41:18 AM<br><b>Subject: </b>[Esr-users] ESR status and recovery of Halls<br><br>Hello All,<br>The attached file shows the current status of all of the magnets in the ESR complex.<br>It shows that we have not made significant progress in recovering from the trip two days ago.<br><br>It appears that shutting off Hall B completely was not enough to make the recovery simple.<br>Yesterday we prioritized Hall A first and Hall C second in our meeting after the 08:00 meeting at MCC.<br>Apparently this did not go so well.<br><br>Cryo started the transferline yesterday afternoon and we still have not made significant progress. <br><br>This morning I met with the cryo group to discuss the possible causes.<br>1) we may additional loads - So each Hall A and C as well as cryo should check the VJ pressure or temperatures to look for additional heat loads.<br>2) We may have lost capacity of the ESR refrigerator so Cryo will check to see if flows and temperature ratios are normal<br>3) We may have magnets on the wrong type of return <br>4) we may be trying to cool too much at the same time<br><br><br>We decided that we must start to make progress and we will follow the priority guidance that was agreed to yesterday.<br><br>Recover A, then recover C then recover B<br><br>As such:<br><br>1) Hall C should prioritize their system to take only 5 g/s until all Hall A magnets are full and stable<br>2) Cryo and Hall A should put all magnets on warm return and cool only a few at a time until those can be put on cold return while giving those on warm return just enough to keep them from warming significantly.<br>3) Hall B will wait until all other magnets are on cold return. <br>4) After all the Halls are recovered, the 10,000 liter dewar at ESR will be topped off.<br><br><br>If Hall C needs more or can take less flow please let me know.<br><br>Thanks<br>Dave Kashy<br> <br>_______________________________________________<br>Esr-users mailing list<br>Esr-users@jlab.org<br>https://mailman.jlab.org/mailman/listinfo/esr-users<br></div><br></div></body></html>