[Opera-CONNIE] loss of vacuum

[Guillermo Fernandez]

Hello,

it seems we have had another shutdown of the system, but this time due to a problem in the vacuum system, on Saturday 10th in the evening. The system started the warm up process of the detector because a detection of pressure above the safe limit. The pump indicates Error 006 which correspond to 

-------------- next part --------------
A non-text attachment was scrubbed...
Name: PastedGraphic-1.png
Type: image/png
Size: 27513 bytes
Desc: not available
URL: <http://listas.if.ufrj.br/pipermail/opera-connie/attachments/20150112/8f981cb0/attachment-0001.png>
-------------- next part --------------
 

The pump started sending this error at 22:20:56 GMT on 1/10/15. Few minutes before the system started in shutdown.

The rough pump is still running, but not the turbo pump. However, the vacuum at the moment is 9.34 mbars, much higher than expected only with the rough pump. 
It is attached a report of the more important variables (and a zoom of the last our). Together with the loss of vacuum, there was a very quick increase of the temperature of the different parts of the pump and an abrupt decrease of the turbo pump rpm. Also the "temperature motor" was the variable with the largest excursion. These signals might indicate we had some leak in the system. It would be very interesting to hear the opinion of someone with more experience with vacuum pumps.

I know there are people going to the nuclear plant tomorrow. What time are you planning to be there and for how long?
We may use the man power there to corroborate the detector status and  start making some vacuum tests. Can you share the phone number of at least two more people going there tomorrow? just in case we have some problems with the experiment's phone. 

The solution of this problem might not be simple. Even some simple tests on the vacuum system might take some time, taking into account they should be done carefully and with guidance from abroad. 

Regards,

Guillermo

-------------- next part --------------
A non-text attachment was scrubbed...
Name: report.pdf
Type: application/pdf
Size: 5154185 bytes
Desc: not available
URL: <http://listas.if.ufrj.br/pipermail/opera-connie/attachments/20150112/8f981cb0/attachment-0002.pdf>
-------------- next part --------------

-------------- next part --------------
A non-text attachment was scrubbed...
Name: report.pdf
Type: application/pdf
Size: 152108 bytes
Desc: not available
URL: <http://listas.if.ufrj.br/pipermail/opera-connie/attachments/20150112/8f981cb0/attachment-0003.pdf>