Table 6 dDNP maintenance routine, conducted once a week (automatically and scheduled).
From: Performance and reproducibility of 13C and 15N hyperpolarization using a cryogen-free DNP polarizer
No | Operation | Comments | Norm values |
|---|---|---|---|
Stop the dry pump | 0 Hz | ||
Reduce the He flow | |||
The VTI T increases automatically | It takes at least 6 h | 150 K (at least) | |
The system stays warm for at least 38 h | It is possible to use the entire weekend | ||
Automatic cleaning of the VTI by using the vacuum pump when the T is higher than 150 K | |||
Decrease the T again | ~ 3 h |
