Cool Down Procedure

Since 2008A, NIRC has been scheduled in blocks of time and is warmed inbeteen runs. The following is the general plan for reviving NIRC when it is scheduled on sky.
  1. 5 weeks ahead of the run- put on pump: evacuate for one week.
  2. 4 weeks ahead of the run- warm fill with LN2.
  3. 4-3 weeks ahead of the run - Monitor temps and ensure NIRC will be at ~80K a week before the run. We should be able to tell during the week after the LN2 warm fill and recover if it looks bad within three weeks.
  4. 3-1 week ahead of the run - This is a recovery period. If no recovery is necessary, coninue to monitor temperatures.
  5. 2 days before the run- warm fill with LHe.

Mark Kassis
Last modified: Mon Jan 21 09:55:49 HST