[Hallb-engineering] torus cooldown

David Kashy kashy at jlab.org
Fri Nov 19 16:26:55 EST 2010

Cryo is now controlling the back pressure valve on their own sensor 
CPI8521. This sensor seems to be correct and stable. I believe we have 
torus alarms that could ramp down the magnet on PI1028 so this will need 
attention as time allows.


On 11/19/2010 2:48 PM, David Kashy wrote:
> The Torus and Buffer dewar have been cooled. It went quite well.
> Please check for dripping water in the hall as the cooldown lines warm
> up. They should be melting now as we are fully on cold return for both
> systems.
> Also we need to check the final flows once the system has stabilized
> because I'm not convinced the distribution vacuums are as good as they
> were in the past...
> Cryo is using our pressure sensor PI1028 to control the back pressure
> regulation valve EV6721B to keep constant back pressure. At present this
> signal is very noisy. Hopefully it will stabilize when the magnet is
> full of liquid. Please keep an eye on this too. We may need to find a spare.
> Thanks
> Dave
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