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 
beamline equipment. 
Picture of the cryocooler vacuum jacketed line iced up after a failure
of the turbo pump.

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.

Same as above

Fig 07-17.2. Another view of the iced up line.

Same as above.

Fig 07-17.3. Yet another view of the lines

. After repumping.

Fig 07-17.4. View of the lines after repumping the jackets. The ice melted.

After repumping.

Fig 07-17.5. View of the lines after repumping the jackets.