Beam Physics Meeting

Wednesday 18 Jun 2008, 16:00 → 18:00 Europe/Zurich

1/1-025 (CERN)

Pre-Damping Ring presentation/discussion

Participants: * K. Elsener, E. Adli, D. Schulte, F. Antoniou, B. Jeanneret, , Y. Papaphillipou, R. Tomas, O. Mete, B. Dalena, H. Braun FA: presentes optics design considerations for a TME lattice *************** - YP: notes: this analytical optimization has NOT ben done before for a TME cell (only numerical solutions) - HB: important to think about effect of non-linearities as well (beta at sex.), YP: not yet taken into account in optimization - challenge: we need high momemtum acceptance (+/- 1%) -> competing req. with min. emittance due to high momentum compaction factor - challenge: need 0.8ms damping times (2 x faster than CLIC damping rings) -> need damping wigglers and interleaved trains HB: are we positive TME cell is the way to go? Maybe better with larger dipole fill factor -> YP / FA : agrees, one should consider other cells as wel DS: is emittance the right thing to minimize? ... YP: ... in fact no, not the most critical thing! Can e.g. get smaller momentum compaction factor if we increase emittance somewhat (can go to a factor 2 in emittance) YP: the "emittance parameterization" curve is very nice, and can be used to optimize other criteria as well YP/FA: next step, look at numerical solutions, start for full with MAD EA, 18-jun-2008