Participants: E. Adli, A. Aksoy, J. Barranco, S. Bettoni, B. Dalena, K. Elsener, B. Jeanneret, M. Jonker, E. Koukovini, E. Marin, J. Pfingstner, L. Rinolfi, D. Schulte, P. Skowronski, J. Snuverink, I. Syratchev, A. Vivoli
A. Aksoy reports on the drive beam linac studies. The linac consists of two parts, DBL1 and DBL2, divided by either a chicane or a positive R56 line. 19-cell structures with 15 MW input power have been chosen. Simulations show that a negative-R56 chicane in between the two linac sections produces a final rms energy spread of about 0.57%. If a positive-R56 lattice is used instead the final energy spread can be reduced up to 0.28%. This is realized by choosing the phase of the first drive beam linac (DBL1) such that the induced energy "chirp" produces an overcompression at the end of the positive-R56 line that is then compensated by the wakefield in the second drive beam linac (DBL2). The transverse optics has been modified in order to have a weaker focusing in the last part of the DBL2 which simplifies the tuning of the system. The emittance growth after 1-to-1 steering is less than 5%. Multibunch studies are missing.
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