Ice from poor vacuum inside jacket on 7/17/03
On 7/17/03 I found out that the cryocooler vacuum jacketed lines had vented
following a power bump. The power bump tripped a breaker and the turbo stopped.
When our turbo stops, at the end of its slowing down process it vents the
system opening a venting valve. I will try to fix this in the future by
disabling the venting valve and replacing it with a manual valve. In the
meantime, we should be careful to leave the pump unattended on critical
Fig 07-17.1. Picture of the vacuum jacketed line iced up after a failure
of the turbo pump. There was a noticable power bump today and the breaker #17
feeding the turbo pump tripped. The turbo vents when it turns off so the
jackets were unfortunately vented. This could have resulted in serious problems
with the cryocooler.
Fig 07-17.2. Another view of the iced up line.
Fig 07-17.3. Yet another view of the lines.
Fig 07-17.4. View of the lines after repumping the jackets.
The ice melted.
Fig 07-17.5. View of the lines after repumping the jackets.