Minutes from REX integration meeting 7/1/2004

Present: Friedhelm Ames, Joakim Cederkall, Pierre Delahaye, Mats Lindroos, Thomas Nilsson, Thomas Sieber, Fredrik Wenander

1. Priorities for MD time spring 2004

-We have in previous meetings discussed the coming experiments at REX-ISOLDE and the need for MD time at REX itself. The priorities for the coming MD period is: He in the low energy part, continue work on molecular beams (AlFl, SeC) in low energy part, "rotating wall" for the trap and slow extraction from the EBIS system (needs reprogramming of the GFAS programme). -The timing sequence from the trap and EBIS to the linac should be revised. It should be possible to gain in simplicity if the linac could be triggered directly on the EBIS extraction pulse rather than on the trap pulse. Still, this requires that a back-up timing is received from the trap if the EBIS is not working to enable MDs at the linac with e.g. the off-line source mounted in the separator part.

2. Work at the trap

-The trap control system is in critical need of a fast consolidation (migration to AB standards). The present control system is based on VME modules that not are available any longer and the in-house know-how on the full system is very limited. The existing specialists are not present at CERN any longer. -There is a short-cut on one of the trap electrodes so the trap must be opened in the shutdown to diagnose and solve this problem. -Pierre Delahaye will have a student this year who will work on the 'rotating wall' development.

3. Work at the EBIS

-The EBIS is being dismantled to enable the specialists to mount the new baking jackets.

4. Work with the control system

-Mats is trying to get an engineer to CERN for one year from Heidelberg to work on the consolidation of the present REX control system. This engineer should work close to the control group to enable them to take over the responsibility for the REX control system in 2005. -Pierre will ask for a second student from CAEN to work on the trap control system. This student should be supervised by someone with in-depth knowledge of the AB control system to make sure that the new trap controls are according to AB standards. -Mats will write to Bertrand and ask for advice concerning the control system. In particular we need help with the maintenance of the NT FECs and supervision for the consolidation of the existing control system.

5. Work at the REX linac

-The 200 MHz amplifier has arrived and is now being installed. -The remote control of this new equipment has to be integrated in the REX control system and this will require that the PLC hardware is slightly modified and that some programs in the control system are recompiled after relevant data has been added in the database. -The low level electronics for the 200 MHz amplifier has to be tested and installed. -The vacuum system control has to be modified to include the new cavities. -The drift tubes in the IH structure has to be changed and the gaps in the 9-gap resonators have to be re-adjusted. -The test source will be mounted on the separator for the commissioning of the new structures.

6. Miscellaneous

-Mats will call an open REX integration meeting with all AB groups to discuss the REX integration activity. Each group will be asked to contribute with a short presentation of there present knowledge of the REX equipment and what their plans are for the integration of this equipment in the AB infrastructure.

Notes by Mats Lindroos