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Entry   Opening of the FP cavity valves, posted by Ronic Chiche at ThomX igloo about vacuum IMG_20211104_112239.jpg
    Reply   Opening of the FP cavity valves, posted by Ronic Chiche at ThomX igloo about vacuum 
Message ID: 35     Entry time: Mon Nov 8 14:50:45 2021     In reply to: 34
 Author: Ronic Chiche 
 Status: Fixed 
 Type: info 
 Category: vacuum 
 Location: ThomX igloo 
 Title: Opening of the FP cavity valves 

On Friday the 5th of November, ThomX suffered again from a power breakdown.

all the pumping systems had to be restarted.
this produced a vacuum level increase and the FP-cavity valves shut off for security reasons.

Today the vacuum level is good enough and the 2 FP-cavity valves have been reopened by Eric Mistretta.

 

Ronic Chiche wrote:

as the vacuum level was good enough, I asked Eric Mistretta to open the 2 valves of the FP cavity.

He said the vacuum group made several tests during the last days, opening and closing these valves!
I asked him to not open and close them as it could release some dust on the mirrors.

Eric opened the valves in "local mode", using directly the valves controller (see attached image).
He was unsure of what could happen if he switches to the "remote mode"... the valves could be commanded to close again.
so, for the moment, one stays in "local mode".

after opening the valves, the vacuum level started to decrease inside FP-cavity :
9.7e-10 mbar for the left vessel
1.7e-9 mbar for the right vessel

 

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