Participants: F. Antoniou, R. Corsini, B. Dalena, B. Jeanneret, E. Marin, Ö. Mete, Y. Papaphilippou, J. Pfingstner, L. Rinolfi, D. Schulte, J. Snuverink, G. Sterbini, F. Stulle, R. Tomas, G. Vanbavinckhove, A. Vivoli
D.S. asked to send abstracts for IPAC10 to him, R.C. and O. Brüning by Friday. The following discussion revealed that an email was send around before but unfortunately not to everyone.
J.S. reported on investigations of magnetic stray fields in the long transfer line, the main linac and the BDS. Compared to the long transfer lines tolerances in the main linac and the BDS are largely relaxed but still tight. On the other hand, the accumulated error from the long transfer line could be mitigated by a feed forward system, while the error from main linac and BDS is uncorrectable. B.J. informed that according to the magnets group magnetic stray fields could be measured with an accuracy of about 1 nT. This value is of the order of the dynamic variation of the earth magnetic field, which varies at frequencies of a few Hz. B.J. will arrange a meeting with L. Walckiers and C. Jach to discuss this issue.
D.S. reported on the different scenarios for low energy running of CLIC. The preferred option is to lower the gradient and to increase the pulse length. Since this might require irregular bunch spacing within the drive beam pulses B.J. asked if this would be acceptable in the PETS. D.S. responded that this needs to be studied, but there would be no obvious problems.
Y.P. proposed to lower the gradient of the cavities of the injectors and damping rings to 1 GHz. This would ease many beam dynamics issues. But it would also imply to double the bunch spacing and due to this the combination of two bunch trains after the damping rings. This needs to be studied further to gain a better understanding of advantages and disadvantages. A major challenge will be the stability of the kickers required for the combination. D.S. asked if this should be proposed as baseline at the CILC meeting 2009-12-11.
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