AD BCCCA - insulation vacuum

Monday 26 Aug 2024, 10:30 → 11:30 Europe/Zurich

zoom (CERN)

Gunn Khatri (CERN), Jocelyn Tan (CERN)

10:30 → 10:50 AD BCCCA - insulation vacuum

Speakers: Agostino Vacca (CERN), Alexandre Sinturel (CERN), Gunn Khatri (CERN), Jocelyn Tan (CERN), Mark Mclean (CERN), Stephane Bart Pedersen (CERN), Dr Torsten Koettig (CERN)

20240826 BCCCA insulation vacuum.pdf

20240826 BCCCA insulation vacuum.pptx

Present:

Jocelyn, Alex, Torsten, Gunn

 

Discussion:

• This week wednesday - cooldown starts
• It is already purged with dry N2, several times, and the vacuum is now E-5 mbar
• The pumping will stop and we will keep under static vacuum when cooldown
• The pump replacement will only be possible during November as we are not sure if the angle valve (before turbo) is leak tight
• Suggestion of Alex is to use Penning+Pirani gauge on CF flange in a CF40 TEE, long control cables for both the turbo pump and the gauge controller.
• Install the gauge+turbo controllers in the rack in AD hall where the rest of the BCCCA electronics are located.
• Interlock logic suggestion is to use the pump speed signal (>80%) coming out from the turbo controller back, going into PLC to control a relay which then controls the angle valve before the turbo
• So we need to request EN-EL (1) Turbo cable, (2) Penning cable (3) Pirani cable and (4) valve relay cable. PS: there might be some cable already existing
• Implement these into the control GUI, with option to by pass the pump-speed based interlock for the first pumpdown.