When IGRINS is stored at McDonald Observatory it is necessary to plan in advance for cooling and vacuum pumping procedures.
Scenario 1: IGRINS will be off the telescope for two weeks or less
In this case IGRINS should remain cold while being stored and Lakeshore heaters should be set to normal operating temperatures.
Large jolts and impacts can harm the optics and the detectors are sensitive to power fluctuations.
Do not connect detector power and USB unless requested. The Calibration Unit doesn't need to be connected to the electronics cabinet unless requested.
As part of Fduty please ensure that heaters are operating normally, that the dewar pressure is lower than 1E-7 torr, and that the CTI Coldhead is making the appropriate maraca noises.
Scenario 2: IGRINS will be off the telescope for more than two weeks
When IGRINS will be off the telescope for a longer period we need to make every effort to refresh the vacuum and complete maintenance tasks.
It will take IGRINS ~2 days to warm to room temperature, 3 days to pump, and another 3 days to cool back to operating temperature.
Read the Vacuum Refresh Procedure before starting this process.
While warm, IGRINS detectors are at risk of deteriorating when exposed to temperatures above 100F. The refrigerated dome is safe, but outside is not.
Do not connect detector power and USB unless requested. The Calibration Unit doesn't need to be connected to the electronics cabinet unless requested.
As part of Fduty please ensure that the Lakeshore heaters are set to normal operating temperatures, that the dewar pressure is lower than 1E-7 torr, and that the CTI Coldhead is making the appropriate maraca noises.