Participants: A. Aksoy, F. Antoniou, S. Bettoni, R. Corsini, B. Dalena, S. Doebert, K. Elsener, E. Eroglu, J. Esberg, A. Gerbershagen, B. Jeanneret, E. Koukovini, E. Marin, Ö. Mete, G. Morpurgo, Y. Papaphilippou, J. Pfingstner, L. Rinolfi, G. Rumolo, D. Schulte, J. Snuverink, G. Sterbini, F. Stulle, A. Vivoli
B.J. reported on newest developments for the drive beam injector and the combination scheme. The drive beam accelerator became longer and is now about 2.5 km long. A major issue is its power consumption of 290 MW. To allow for different combination schemes several delay loops will be needed. Not all of them are designed yet. After the combiner rings the beam lines will follow the layout of the central arcs and the vertical transfers used for the main beams. The bunch un-compression and re-compression around the loops needs to be included. F.S. asked about the path length differences for e- and e+ induced by using the same tunnel as the main beams. Since this is a static offset it can be taken into account by shifting the timing of the drive beam injectors.
L.R. gave an update on the main beam injectors including the RTML. Two target stations will be used. The halls for the remote handling systems and the injectors are being worked out. Just after the damping rings additional space of about 100 m had to be foreseen for the spin rotators. This space can be deleted from the beam lines after the turn around loop, where the spin rotators have been previously. Due to the change of the booster linac frequency to 2 GHz it is now about 500 m long. Due to beam dynamics constraints the radius of the turn around loop enlarged to 305 m.
Y.P. discussed the damping ring layout including pre-damping rings and combiner ring. A major problem is that many transfer lines are required which cross each other. Another issue is that an interference of synchrotron radiation fans and injection or extraction kickers should be avoided, since they are sensitive to radiation. More work is needed to find a good solution. Until then no transfer line will be designed. S.D. asked if it could be possible to combine some of the transfer lines with beam lines required in the RTML, e.g. diagnostics. This might be possible but would require more detailed work. D.S. asked S.D. for proposals.
The talk by A.A. has been postponed to next week.
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