Bruker 300'154 Ascend DNP, User Manual

Page: 53 / 102

53 ZTKS0269 / Z33108 / 02
Troubleshooting
6.3 After a Quench
Quench while in persistent mode:
1. Wait until helium stops evaporating and the quench valves are closed.
2. Wait until there is no helium vapor visible anywhere to make sure there is sufficient
oxygen in the room.
3. If equipped with switch the Atmospheric Pressure Device OFF.
4. Check that the globes in the quench valves are in the correct position.
5. Only at magnet systems with 3 helium turrets: check the bursting disc at the helium
flow system. If destroyed close the socket with the supplied plug to prevent air from
entering the helium flow system or vessel.
6. Remove probe and shim system to prevent icing of the shim system.
7. Check the nitrogen turrets for icing.
8. Start the refill with liquid helium as soon as possible after the quench (within one
hour after the quench; refer to the supplied manual "Refilling Procedure").
9. Contact Bruker Service immediately.
Figure 6.1: Magnet system during a quench
A quench is the very fast de-energizing of
the magnet by loss of its superconductivity.
The stored magnetic energy is converted
into heat, which promotes rapid evapora-
tion of large quantities of helium.
If a quench occurs contact Bruker Service
immediately.
WARNING
Cryogenic Agents (see page 17 )
Quench (see page 18 )
If the quench occurs unattended or helium transfer was not possible within one hour
after the quench, it is recommended to warm up the system to 90 K. Refer to the
supplied manual “Refilling Procedure”.