MEETING FOR VACUUM SYSTEM (12/05/03)

Present: A. Jokinen, S. Meunier, I. Podadera, D. Porret

Control:

-         The applications have to allow us to control the pressure inside the RFQ cavity (0,1 mbar or lower).

-         At ISOLDE manufacturer’s control system for pumps is used, and own electronics system for gauges. All the control goes through the PLC.

-         Every pump of ISOLDE has a display with a small information for local use.

-         The vacuum control units that provide the manufacturers for the gas feeding (with feedback) are fine.

-         David requires information about the interlocks.

Vacuum:

-         Sophie wants to verify what if the area is closed by a faraday cage and we need to turn off the high voltage to access to the existing forepumps.

-         The control units and some valves of the gas feeding system will work in the high voltage, like all the system between insulators.

-         Sophie is worried about the worklife of the turbopump which is supposed to work at 10^-3 mbar because of the ball bearings. The magnetic pumps are not necessary and they are really expensive.

-         There exists a problem with the forepump if we add a lot of gases. Maybe we’ll need a tests for exhaust gases.

-         We should use a oil-free forepump at least if we want to keep as clean as possible our system.

-         Balzers provided specific gauges done for CERN.

-         Sophie will provide information about the VAT valves uses for the turbomolecular pumps and for closing the beam line section.

-         For the backing system we have to decide the good solution. Maybe backing jackets around the system.

-         Probably we’ll need a gas purifier to keep the system as clean as possible.

Others:

-         For year 2005 there is a lot of work planned for the vacuum group as they begin to work for LHC. So, the work for the RFQ should be planned and prepared.

-         We need offers for Pirani/Penning gauges as the vacuum system is the most expensive of the project.

-         Sophie proposes that now they will have a meeting to check and test what is the job required, and then they will give us a proposal.

-         They require a delay and that we provide a layout of the complete vacuum system with the pumps, gauges, valves,…

Links to RFQ cooler and buncher meetings (NICE code required): http://ab-div-op-iso-rfqcb.web.cern.ch/ab-div-op-iso-rfqcb/meetings.htm

Links to RFQ cooler and buncher home page: http://ab-div-op-iso-rfqcb.web.cern.ch/ab-div-op-iso-rfqcb/