| Lines 9-10 were replaced by line 9 |
| - * make the seal with clean fingers (a thick layer on the stick, |
| - only a small amount inside the aluminium tube) |
| + * make the CAF seal (red silicon paste) with clean fingers |
| Lines 14-23 were replaced by lines 13-26 |
| - * put into LN2 for precooling, put a small amount of He (1 mbar or |
| - less) into the IVC. |
| - * if there is no hurry and the sample must be cooled slowly, |
| - the stick might be put directly into the cryostat (without LN2 precooling). |
| - |
| - * cool down the heat exchanger of the variox or magnet (setpoint 5 K) |
| - * pump the IVC (15 min. with sorb temperature set to 40 K, |
| - then 1 h without sorb heater) |
| - * test if the temperature of the mixing chamber is no longer coupled |
| - to the heat exchanger (changing the setpoint to 6 or 7 K). |
| + * put the stick into the Variox or magnet VTI. |
| + * insert about 50 mbar 4He into the IVC |
| + * take the special assembly to connect the pumping |
| + line and the condenser line with the stick |
| + * pump out the adapter piece |
| + * connect a turbo pump to the IVC, start te pump, but do not yet open the IVC valve. |
| + |
| + The following steps can be done automatically in SEA, under "main diltuion control" |
| + |
| + * ("cool") cool down the heat exchanger of the variox or magnet |
| + * When the stick is cold (< 4K, ins SEA "readyforpump") pump the IVC by clicking on "sorbpump" and opening |
| + the IVC valve, which is already connected to a running turbo pump. |
| + This heats up the VTI to 5 K, which might take a while. After 20 min. with sorb temperature set to 40 K, |
| + then 15 min without sorb heater, the "condense" step starts automatically. |
| Removed line 25 |
| - |
LIN